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HomeMy WebLinkAbout8.a. 2020 Surface Water Monitoring ProgramG:\MEETINGS\UTILITY COMMISSION\UC Items and Packets\2021\20210426\8.a. 2020 Surface Water Monitoring Program.docx E X E C U T I V E S U M M A R Y Utility Commission Meeting: April 26, 2021 AGENDA ITEM: 2020 Surface Water Monitoring Program AGENDA SECTION: New Business PREPARED BY: Jane Byron, Storm Water Specialist AGENDA NO. 8.a. ATTACHMENTS: 2020 Water Quality Monitoring Program Report APPROVED BY: BLE RECOMMENDED ACTION: None, discussion only. BACKGROUND: The City of Rosemount has been monitoring surface water quality and water levels in key ponds since 2009. Total Suspended Solids, Total Phosphorus, Orthophospate, and Chloride are monitored. Water levels are used to evaluate runoff volumes and infiltration rates. The program assists the City in verifying compliance with state anti-degradation (formerly known as non-degradation) requirements and tracking potential issues of concern. SUMMARY: This is an information/discussion item for the Commission, no action is required. Presentation by WSB. WATER QUALITY MONITORING PROGRAM CITY OF ROSEMOUNT ROSEMOUNT, MN March 23rd, 2021 Prepared for: City of Rosemount 2875 145th Street West Rosemount, MN 55068 WSB PROJECT NO. R-016347-000 Table of Contents Page i ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2020) TABLE OF CONTENTS EXECUTIVE SUMMARY 1. Introduction ............................................................................................................................................ 1 2. Procedures and Methodology ................................................................................................................ 2 2.1. Water Level Monitoring ................................................................................................................. 2 2.2. Water Quality Sampling ................................................................................................................ 3 3. Results ................................................................................................................................................... 4 3.1. Water Level Monitoring ................................................................................................................. 4 3.2. Rainfall to Runoff Calculations ...................................................................................................... 8 3.3. Infiltration Rate ............................................................................................................................ 10 3.4. Water Quality Results ................................................................................................................. 11 4. Conclusions ......................................................................................................................................... 19 5. References ........................................................................................................................................... 20 ATTACHMENTS Attachment A – Pond Monitoring/Water Surface Management Elevation Map (2003) Attachment B – 2020 Water Level Tables and Charts B.1 2020 Water Levels B.2 2020 Rainfall to Runoff Tables and Charts B.3 2020 Evaporation & Infiltration Tables Attachment C – Water Quality C.1 Long-Term Water Quality Tables C.2 Long-Term Water Quality Box and Whisker Charts C.3 Chloride Charts Executive Summary Page ii ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2020) EXECUTIVE SUMMARY The City of Rosemount (City) has implemented a water quality monitoring program since 2009 that provides the City with empirical data that can be used to help guide stormwater water management activities. The City has monitored between 10-12 basins annually for water quality parameters including total suspended solids (TSS), total phosphorus (TP), orthophosphate (OP), and chloride. Water levels are also monitored to evaluate level fluctuation, runoff volumes, and infiltration rates. This report provides a summary of the results of data collection activities from 2014-2020. The monitoring data is used to fulfill multiple MS4 program requirements in minimum control measures (MCMs) 5 and 6 related to inspection, long-term operation, and maintenance of infiltration Best Management Practices (BMPs). The water level data is used to observe fluctuations in basin levels, especially landlocked basins, to protect adjacent structures from flooding risks. Observed infiltration rates were compared to infiltration results outlined in the City’s Non-Degradation Report. Runoff ratios for the individual basins are calculated using localized rainfall data and level data, and were evaluated against impervious surface percentages and land use types. Water quality is utilized to determine if basins are meeting anticipated pollutant removal efficiencies for total suspended solids and total phosphorus. Additionally, snowmelt sampling is conducted to assess winter pollutant concentrations associated with snowmelt runoff. Data collection activities were conducted from June through October each year, with snowmelt sampling occurring during the winter. Basins that are monitored for level are equipped with an electronic monitoring device that records continuously. Event-based rainfall is also monitored within several locations within the City to provide localized rainfall totals. Water quality samples are collected as grab samples approximately monthly. A summary of the notable findings from the monitoring activities include: Water Level Monitoring • Landlocked basins Location 9 (2443) and Location 10 (614) have shown a significant increasing trend in minimum, maximum, and average water levels over the seven years of monitoring. Management activities at those sites should be evaluated to ensure adequat e storage capacity and acceptable water levels at those sites. • The long-term City-wide Rainfall to Runoff (R/R) ratio was 0.22, which indicates that, on an average of 22% of rainfall ends up as runoff within the City. • Infiltration monitoring has shown a 7-year average infiltration rate of 0.066 inches per hour (in/hr) City-wide. Which is greater than the 0.01 in/hr infiltration rate identified in the City’s Non-Degradation Report. Water Quality Monitoring In general, higher stormwater pollutant levels were observed at Location 6 (578) and Location 7 (1864). 2020 monitoring season saw low amounts of rain and lower or similar concentrations of pollutants at all locations. TSS • The long-term median concentration for TSS City-wide was 10 milligrams per liter (mg/L). The long term median TSS concentration ranged from 6 mg/L at Location 1 (1608) to 34 mg/L at Location 10 (614). TP • The long-term median TP City wide was 0.14 mg/L which is lower than the anticipated range for treated stormwater of 0.15 to 0.2 mg/L. Executive Summary Page iii ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2020) OP • OP was noticeably greater at Location 6 (578), than the other monitored basins. The drainage area to that basin includes a large area of open park space. Chloride • The results of the chloride sampling have shown that Location 6 (578) and Location 9 (2443) have exceeded the acute chloride standard of 860 mg/L during snowmelt sa mpling in 2016 (Loc. 6 & 9), 2018 (Loc. 6), 2019 (Loc. 6) and 2020 (Loc. 6). These concentrations ranged from 1,080 mg/L – 3,400 mg/L. • Locations 6 (578) and 9 (2443) contain areas of commercial and/or downtown land uses within their drainage areas, which is typically associated with higher salt use in the winter. This is reflected in the elevated chloride concentrations observed within the basins. Section 1 – Introduction Page 1 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2020) 1. INTRODUCTION The water quality monitoring program for the City of Rosemount (City) includes seasonal water data collection at select stormwater basins in the City. The data is used to fulfill multiple MS4 program requirements in minimum control measures (MCMs) 5 and 6 relate d to inspection, long-term operation, and maintenance of infiltration Best Management Practices (BMPs). The water quality monitoring program provides the City with empirical data that can be used for the following purposes: • Guide Watershed and City Stormwater Plan Updates and discussions with observed runoff volumes and infiltration and evaporation rates. • Identify potential areas to receive regional volume reduction credit through stormwater reuse applications. • Validate pond treatment efficiencies from the SWMP program with sampled Total Suspended Solids and Total Phosphorus concentrations. • Supporting conclusions in the City’s Non-Degradation Study with observed infiltration and evaporation data. • Creating a baseline for discharge volumes and pollutant loading assumptions of possible future Total Maximum Daily Loads (TMDLs) in the Vermillion River and Mississippi River. • Assessing winter pollutant concentration associated with snowmelt runoff. Water level and water quality data were collected as part of this monitoring program to analyze basin performance and watershed characters. Water level and precipitation data was used to calculate runoff volumes for various storm events and to develop a relationship between rainfall and runoff for the drainage area. Water level data is utilized to generate infiltration and evaporation rates during periods of no rainfall. To evaluate these parameters, electronic monitoring equipment was used to continuous ly measure system water levels and rainfall amounts. The ponds selected for monitoring are summarized in Table 1.1 below which also includes a description of basin and drainage area characteristics. The pond location maps are provided in the Figures attachment and include the drainage area and land use information. Table 1: Pond Monitoring Locations Monitoring Location Drainage Area Information Monitoring Activities Basin Surface Area Drainage Area % Impervious Water Level Apr-Oct Water Quality Snow-melt Sampling Location 1 – Marcotte 1408 1.90 27.4 17% X X X Location 2 – Glendalough 1486 1.39 142.8 25% X X Location 3 – Trailer Park 1589 0.87 37.2 37% X X Location 4 – Unnamed 1687 0.55 58.8 25% X X Location 5 – Regional 1716 0.55 169.2 30% X X X Location 6 – Erickson 578 2.26 164 39% X X X Location 7 – Bloomfield 1864 0.79 37.3 35% X X X Location 8 – O’Leary’s 600 5.56 125.5 43% X X Location 9 – Wachter 2443 5.1 384.8 41% X X X Location 10 – Shannon 614 3.17 176.8 36% X X Location 11 – Greystone 17201 0.58 25.1 45% X 1 – Newly constructed basin added to the Monitoring Program in 2016. Section 2 – Procedures and Methodology Page 2 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2020) 2. PROCEDURES AND METHODOLOGY This section outlines the procedures and methods followed to perform monitoring and data analysis. 2.1. Water Level Monitoring Pond level monitoring was completed using automatic level loggers that record water surface elevation at an interval of one reading per hour. During equipment installation at the beginning of each monitoring season, a reference elevation is collected to co nvert monitored water depth into water surface elevation. Monthly data retrievals and equipment maintenance is completed in conjunction with water quality sampling activities. Image 2.1: Level Monitoring Configuration The water level data is utilized to calculate a rainfall to runoff (R/R) ratio for each rainfall event. A R/R ratio represents the proportion of rainfall that is not infiltrated or evaporated, and thus, end s up as runoff. The purpose of calculating a R/R ratio is to establish a relationship that can be used to estimate runoff for a drainage area. The data can be used to calibrate stormwater models, compare runoff produced by different drainage areas, and to analyze changes in runoff volume over time for a specific basin. A R/R ratio is calculated by estimating the volume received by the basin from the change in water level over the pond surface area. The volume is then converted to inches of runoff per acre of contributing watershed area. The annually calculated R/R ratio is the linear regression of the event-based R/R calculations for each year. The water level data is also utilized to calculate infiltration and evaporation rates for the monitored basins. This data can be used to calculate actual volume infiltrated, and the trend data can be used to help identify basins in need of maintenance. The infiltration rates are calculated by change in water level over time, when water levels are below outlet elevations (basin is not discharging). The rates that are calculated include infiltration and evaporation. Section 2 – Procedures and Methodology Page 3 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2020) 2.2. Water Quality Sampling Water quality samples were collected as grab samples from Locations 1-10 monthly, approximately July thru November of 2020. Winter snow melt sampling was also completed at basins 1, 5, 6, 7, 9, and Birger Pond. The samples were targeted for the mid-water column, to be representative of concentrations within the basin. Snow-melt sampling followed the general procedures outlined in the MPCA Guidance (MPCA, 2015). The samples were collected using an extension rod sampler which was rinsed three times before collection. The samples were then transferred into laboratory provided containers with the appropriate preservative, placed in a cooler on ice, and delivered to Tri-City Laboratory in Bloomington, MN. The samples were analyzed for the parameters listed in Table 2.1 below. Table 2.1: Water Quality Parameters Monitoring Parameters Total Suspended Solids Total Phosphorus Ortho-Phosphate Chloride Section 3 – Results Page 4 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) 3. RESULTS 3.1. Water Level Monitoring Stormwater runoff from areas within the City of Rosemount is directed to various lakes, ponds, or depressions within the City, many of which are landlocked. Location 6 (578), Location 7 (1864), Location 9 (2443), and Location 10 (614) are basins that are closely monitored because in addition to localized runoff, these basins also receive discharge from upstream stormwater features, which makes them susceptible to significant water level increases during major events. The City has outlined specific management elevations and activities at these sites to ensure adequate capacity is maintained to effectively store and treat stormwater runoff. Image 3.1: Water Level Monitoring (Location 6) The water level data that has been collected was evaluated against the management elevations that were established for each of the basins. 2020 water level charts with hourly rainfall data are included in Attachment B. Table 3.1 below includes a summary of the minimum and maximum water elevations that have been observed over the 2020 monitoring season at each site, as well as applicable management elevations and outlet details. Section 3 – Results Page 5 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) Table 3.1: Water Level Summary Basin Details 2020 Maximum and Minimum Levels Pond # Basin ID NWL HWL Outlet Details Minimum Water Elevation (ft amsl)) Date Maximum Water Elevation (ft amsl) Date Loc #1 1408 905.5 910.67 Lift -E 905.8 10/11/2020 908.5 6/29/2020 Loc #2 1486 926 935.3 Lift -E 923.8 10/11/2020 926.9 6/29/2020 Loc #3 1589 928 940.68 Lift -P 925.2 10/9/2020 929.1 6/29/2020 Loc #4 1687 929.7 940.3 RCP-E 926.6 10/9/2020 932.6 6/29/2020 Loc #5 1716 916 923.8 RCP-E 915.3 10/11/2020 918.7 6/29/2020 Loc #6 578 923 933.73 Lift-P 919.0 10/11/2020 921.4 6/29/2020 Loc #7 1864 909 913.89 RCP-P1 908.3 6/18/2020 910.4 6/29/2020 Loc #8 600 929.7 935.04 RCP-E 929.7 7/18/2020 932.0 6/29/2020 Loc #9 2443 906 926.65 Lift-P 913.6 10/11/2020 919.3 6/29/2020 Loc #10 614 914 920.22 Lift P 918.7 6/18/2020 921.6 6/29/2020 Loc #11 1710 918.5 923 RCP-P 915.5 10/11/2020 918.3 6/29/2020 The water elevation range at Location 6 (578) and Location 7 (1864) over the 2020 monitoring period was 2.4 feet and 2.1 feet, respectively. There has been no indication of an increasing trend in either average or maximum levels at those locations. Based on the monitoring data collected to date, these basins have been observed to provide adequate storage and infiltration of the runoff that has been conveyed. Additionally, Location 6 (578) receives discharge from an adjacent splash pad during summer months. On average, 10.7 million gallons per year have been discharged from the splash and infiltrated by the basin. The daily level increase and subsequent decrease as a result of the splash pad discharge is approximately 0.3 feet. Conversely, Location 10 (614), has shown an increasing trend in the minimum, maximum, and average water levels at those sites since 2014. Location 9 (2443) saw a decrease in minimum, maximum, and average water levels for the first time in 2019, but those levels rose again in 2020. Those trends are presented on Charts 3.1 and 3.2 below. Location 9 (2443) levels have consistently exceeded its management elevation of 910 feet amsl. The average water level in 2020 was 4.5 feet higher and the maximum water level was 6.9 feet higher compared to 2014 at Location 9 (2443). Additionally, Location 9 (2443) exceeded its management elevation for temporary pumping two times in 2019, and three times in 2020, which is summarized in Table 3.2. Section 3 – Results Page 6 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) Chart 3.1 Chart 3.2 Section 3 – Results Page 7 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) Table 3.2: Location 9 & 10 Pond Management Summary Location 9 – Wachter 2443 (916.0 ft amsl) Location 10 – Shannon 614 (920.2 ft amsl) Date Event Rainfall (in) Management Trigger Date Event Rainfall (in) Management Trigger 6/18/2020 1.54 Pump 6/29/2020 2.99 5-day monitoring 6/29/2020 2.99 Pump 7/18/2020 1.08 5-day monitoring 8/10/2020 0.91 Pump 9/7/2020 0.41 5-day monitoring 9/9/2020 0.14 5-day monitoring 9/11/2020 0.17 5-day monitoring The maximum water level at Location 10 (614) has increased by 10 feet from 2014-2020. Additionally, the average water level was 0.6 feet higher in 2020 compared to 2019 and has increased by 1.8 feet on average since 2014. Maximum water level occurred on the same date at all sites on June 29th, 2020, as a result of 3.59 inches of rain over a 21-hour period. The increasing water level trends that have been observed are presented on Chart 3.2 below. Based on the management elevations identified for these basins and the increasing trend in water levels annually, these sites should be evaluated for alternative management strategies that aim to restore the capacity of the basins. Section 3 – Results Page 8 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) 3.2. Rainfall to Runoff Calculations R/R ratios, also known as runoff coefficients, were calculated for each basin in 2020 and the results are presented in tables and charts in Attachment B. During the 2018 Surface Water Management Plan (SWMP) update, the drainage areas for the basins were reevaluated. As a result, the R/R ratios were recalculated for the previous years (2014-2017), with the updated drainage information. The annual R/R ratios provided below are based off the linear regression of individual R/R events (Chart 3.3). The long-term average R/R ratios are presented on Table 3.3, below. Table 3.3: R/R Ratio Summary Pond Information % Impervious Long Term Average R/R Ratio 2014 R/R Ratio 2015 R/R Ratio 2016 R/R Ratio 2017 R/R Ratio 2018 R/R Ratio 2019 R/R Ratio 2020 R/R Ratio Pond # Basin ID Loc #1 1408 17% 0.33 0.19 0.28 0.49 0.44 0.32 0.39 0.20 Loc #2 1486 25% 0.09 0.12 0.08 0.08 0.09 0.08 0.08 0.08 Loc #3 1589 37% 0.39 0.37 0.38 0.37 0.44 0.37 0.47 0.35 Loc #4 1687 25% 0.12 0.18 0.12 0.12 0.08 0.13 0.11 0.1 Loc #5 1716 30% 0.17 0.20 0.18 0.15 0.14 0.15 0.16 0.18 Loc #6 578 39% 0.16 0.18 0.14 0.23 0.20 0.12 0.15 0.11 Loc #7 1864 35% 0.20 0.20 0.23 0.15 0.30 0.15 0.19 0.2 Loc #8 600 43% 0.33 0.33 0.38 0.28 0.32 0.33 0.34 0.35 Loc #9 2443 41% 0.19 0.15 0.19 0.19 0.23 0.21 0.17 0.21 Loc #10 614 36% 0.20 0.21 0.25 0.26 0.18 0.22 0.12 0.13 Loc # 11 1720 45% 0.19 NM NM 0.19 0.32 0.12 0.17 0.13 City-Wide Average 34% 0.22 0.21 0.22 0.23 0.25 0.20 0.21 0.22 Greatest R/R Ratio Least R/R Ratio A larger R/R ratio is indicative of less storage and infiltration within a drainage area, and consequently, a greater proportion of runoff being produced. Drainage areas that have a larger percentage of impervious surface will typically exhibit a higher R/R ratio. Event-based R/R ratios can vary greatly depending on rainfall intensity and the antecedent soil moisture. The City-wide R/R ratio has not varied much over the years ranging from 0.20 in 2018 to 0.25 in 2017, with the long-term average being 0.22. Of the monitored basins, Location 3 (1589) has consistently exhibited the greatest R/R ratio since 2014, which has shown that, on average, 39% of the rainfall within that drainage area ends up as runoff. The Location 3 (1589) drainage area consists of 37% impervious surface which is slightly above the average of the monitored basins (34%). The predominate land use at Location 3 (1589) is low density residential (98%), with the remaining area designated as open park space. Section 3 – Results Page 9 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) Other basins that have shown higher R/R ratios include Location 1 (1408) and Location 8 (600), both having a long-term R/R ratio of 0.33. The drainage area for Location 1 (1408) consists of only 17% impervious which is the lowest percentage of the monitored basins. The higher R/R can be attributed to variability in upstream runoff contributions from basins that discharge to Location 1 (1408) that are not within the immediate drainage area. These basins may only discharge during select large rain events and this is shown in 2020 with limited rain events and the R/R ratio dropped for Location 1 (1408) to 0.20. Location 8 (600) consists of 43% impervious surfaces, includes drainage from a significant portion of commercial land use along 150th St. SW (CSAH 42). Location 2 (1486) has produced the lowest R/R ratio every year monitored with a long-term average of 0.09. The Location 2 (1486) drainage area is 25% impervious, which is the 2nd lowest of the basins monitored. The predominate land uses include Transitional Residential (67%) and Rural Residential (31%). Chart 3.3 Section 3 – Results Page 10 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) 3.3. Infiltration Rate The water level data was utilized to generate an infiltration and evaporation rate for the basins when water levels were below outlet and pump elevations. The 2020 infiltration rates are presented in the tables included as Attachment B. A long-term summary of the average infiltration rates is provided in Table 3.4 below. The infiltration rates were evaluated against the estimated rates identified in the City’s Non-Degradation Report that was completed in 2007. The rates described below are inclusive of both infiltration and evaporation. Table 3.4: Infiltration Rate Summary Pond Information Long Term Average Infil. Rate (in/hr) 2014 Average Infil. Rate (in/hr) 2015 Average Infil. Rate (in/hr) 2016 Average Infil. Rate (in/hr) 2017 Average Infil. Rate (in/hr) 2018 Average Infil. Rate (in/hr) 2019 Average Infil. Rate (in/hr) 2020 Average Infil. Rate (in/hr) Pond # Basin ID Loc #1 1408 0.021 0.009 0.020 0.027 0.024 0.024 0.016 0.025 Loc #2 1486 0.039 0.049 0.038 0.042 0.040 0.039 0.035 0.033 Loc #3 1589 0.141 0.149 0.116 0.158 0.180 0.138 0.133 0.111 Loc #4 1687 0.065 0.093 0.073 0.066 0.022 0.054 0.091 0.053 Loc #5 1716 0.056 0.070 0.068 0.031 0.037 0.043 0.057 0.085 Loc #6 578 0.070 0.082 0.163 0.104 0.074 0.044 0.013 0.010 Loc #7 1864 0.035 0.046 0.049 0.020 0.034 0.027 0.039 0.030 Loc #8 600 0.025 0.052 0.054 0.014 0.008 0.023 0.013 0.009 Loc #9 2443 0.087 0.071 0.103 0.106 0.093 0.089 0.081 0.067 Loc #10 614 0.068 0.072 0.085 0.081 0.063 0.074 0.049 0.053 Loc # 11 1720 0.094 NM NM 0.131 0.074 0.073 0.110 0.082 City-Wide Average 0.063 0.069 0.077 0.071 0.059 0.057 0.058 0.051 Greatest Rate Lowest Rate Infiltration monitoring has shown a long-term average infiltration rate of 0.063 in/hr City-wide. Annually, infiltration rates have ranged from 0.051 in/hr in 2020 to 0.077 in/hr in 2015 with a decreasing trend observed from 2015 to 2020. The City’s Non-Degradation Report utilized an average infiltration rate of 0.030 in/hr. This was developed by taking the average of infiltration rates that were identified for type D soils during a literature review. As shown above, the City - wide average infiltration rate has exceeded the City’s Non-Degradation Report rate every year that monitoring has been conducted. In 2020, Location 3 (1589) had the greatest infiltration rate at 0.111 in/hr as well as the greatest long term average infiltration rate of 0.141 in/hr. Location 8 (600) again had the lowest infiltration rate since 2016, although Location 1 (1408), which has a lift station, still has the lowest long-term average infiltration rate. Location 8 (600) had a similar infiltration rate from years prior, but in 2020 there was only one infiltration event. Section 3 – Results Page 11 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) 3.4. Water Quality Results The water quality data collected to-date is provided for each monitoring location in the Tables and Charts included as Attachment C. Water quality sampling has consisted of growing season sampling, roughly April – October, as well as snow melt runoff sampling at select basins in 2016, 2018, 2019, and 2020. The long term median growing season concentration (excluding snow melt samples) for each of the evaluated parameters is presented in Table 3.5 and the 2020 growing season average concentrations in Table 3.6 below. Table 3.5: Long Term Median Pollutant Concentrations (mg/L) Pond # Basin ID TSS Total Phosphorus Ortho- Phosphate Chloride Loc #1 1408 6 0.12 0.031 24 Loc #2 1486 10 0.10 0.013 16 Loc #3 1589 7 0.18 0.060 11 Loc #4 1687 8 0.07 0.010 37 Loc #5 1716 9 0.08 0.012 28 Loc #6 578 9 0.19 0.087 14 Loc #7 1864 15 0.16 0.020 9 Loc #8 600 16 0.18 0.015 34 Loc #9 2443 12 0.13 0.010 58 Loc #10 614 34 0.24 0.010 36 Birger Pond1 6 0.08 0.020 50 City-Wide Average 12 0.14 0.026 29 Greatest Concentration Least Concentration 1 – Growing season water quality sampling was completed in 2014 only at Birger Pond Table 3.6: 2020 Average Pollutant Concentrations (mg/L) Pond # Basin ID TSS Total Phosphorus Ortho- Phosphate Chloride Loc #1 1408 8 0.09 0.006 23 Loc #2 1486 8 0.06 0.004 11 Loc #3 1589 6 0.15 0.071 13 Loc #4 1687 5 0.03 0.000 33 Loc #5 1716 9 0.09 0.005 30 Loc #6 578 9 0.19 0.131 39 Loc #7 1864 14 0.12 0.014 18 Loc #8 600 35 0.16 0.012 25 Loc #9 2443 14 0.08 0.026 65 Loc #10 614 33 0.18 0.000 36 2020 City-Wide Average 14 0.12 0.027 29 Greatest Concentration Least Concentration The findings of the water quality sampling are summarized within this section by pollutant. The results are presented on box and whisker plots which provide a visual representation of the sample distribution and show important statistical data. A summary of the metrics presented on the box and whisker plots is shown on Image 3.2. Individual data points that lie outside of the minimum and maximum values are considered to be outliers. Section 3 – Results Page 12 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) Image 3.2 – Box and Whisker Plot Legend Total Suspended Solids Sources of TSS in stormwater include deteriorated pavement, vehicle exhaust emissions, vehicle parts, building and construction material, road salt, road paint and pedestrian debris, soil material, plant and leaf litter, and atmospheric deposition of particles. Suspended solids transported into rivers and lakes eventually settle on the bottom, and over time this accumulated sediment can clog and alter the topography of bodies of water. City-wide, the TSS long term median was 12 mg/L, which is unchanged from the previous year’s long-term median. Median TSS values ranged from 6 mg/L at Location 1 (1408) to 34 mg/L at Location 10 (614). The greatest variability in TSS concentrations was seen at Location 8 (600) and Location 10 (614), as demonstrated by larger inter quartile ranges (IQR), depicted as the “box” on Chart 3.4 below. The IQR reflects the middle 50% of the data collected at that site. Location 1 (1408) is comprised of predominately low density residential and commercial land uses. Location 10 (614), with the greatest median TSS concentrations, consists of predominantly low-density residential land use. Over the 5-year monitoring period, Location 10 (614) was observed as having a significant increasing trend in water levels every year, which could affect water quality at that location. The City’s Non-Degradation Study presented estimated event mean concentrations for TSS based on land uses, which were derived from a review of applicable research documents. These concentrations included 50 mg/L for open space, 140 mg/L for single family residential, and 215 mg/L for agricultural land uses. Basins built to NURP design standards are anticipated to provide TSS treatment efficiencies of 85%. The City-wide TSS median of 12 mg/L shows that overall, the monitored basins have provided effective TSS treatment. Section 3 – Results Page 13 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) Chart 3.4 – Total Suspended Solids 2020 Total Suspended Solids In 2020, the City-wide TSS average concentration was 14 mg/L and had a range from 5 mg/L at Location 4 (1687) to 35 mg/L at Location 8 (600). Lack of overall rainfall and less large rain events may have affected TSS runoff. Total Phosphorus Sources of phosphorus in urban runoff include plant and leaf litter, soil particles, pet waste, road salt, fertilizer, and atmospheric deposition of particles. Lawns and roads account for the greatest loading, which has shown to contribute about 80 percent of total and dissolved phosphorus (Waschbusch et. al 1999). Phosphorus has a direct effect on plant and algal growth in lakes and is one of the leading causes of deteriorating lake water quality. City-wide, the TP long term median was 0.14 mg/L, ranging from 0.07 mg/L at Location 4 (1687) to 0.24 mg/L at Location 10 (614). Additionally, Location 4 (1687) has the smallest IQR, which indicates that the sample concentrations were closer to the median, with less overall variability. The greatest variability in TP concentrations was seen at Location 7 (1864), similar to observations for TSS. Typical concentrations of TP for untreated stormwater include 0.22 mg/L for commercial, 0.30 mg/L for residential, and 0.32 for cropland land uses. Basins built to NURP design standards are anticipated to provide TP treatment efficiencies of approximately 60%. The City-wide average of 0.16 mg/L TP is within the anticipated range for treated stormwater (<0.20 mg/L). Although, Location 10 exhibited median TP concentrations that are slightly greater than what is ex pected for treated stormwater, the long-term medians at all sites decreased. Section 3 – Results Page 14 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) Chart 3.5 – Total Phosphorus 2020 Total Phosphorous During the 2020 growing season, the City-wide TP average concentrations was 0.12 mg/L, which is less than the long term average of 0.17 mg/L. Location 6 (578) had the highest concentration of TP at 0.19 mg/L and location 4 (1687) had the lowest concentration of TP at 0.03 mg/L. TP concentrations were lower at all locations compared to long term averages. Ortho-Phosphate Orthophosphate is the dissolved component of total phosphorus that is readily available for algal production. Dissolved phosphorus typically accounts for about 45 percent of total phosphorus but can be as high as 50 percent when the source is plant litter and lawns, and as low as 25 percent when the source is predominantly roads (Waschbusch et. al, 1999). City-wide, the OP long term median was 0.026 mg/L, ranging from 0.010 mg/L at Location 4 (1687), Location 9 (2443), and Location 10 (614) to 0.087 mg/L at Location 6 (678). Location 4 also exhibited the lowest TP concentration of the basins evaluated. Location 6 (678), with the greatest observed OP, contains open park space within a significant portion of its drainage area. On average, OP was 52% of the TP that was observed which is close to the expected range when source is plant litter and lawns, typical for open park space. Chart 3.6 – Ortho-Phosphate Section 3 – Results Page 15 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) 2020 Ortho-Phosphate During the 2020 growing season, the City-wide OP average concentrations was 0.027 mg/L, which is less than the long-term average of 0.041 mg/L. Many locations saw very low values in 2020, including Location 4 (1687) and Location 10 (614) which had no traceable OP. Location 6 (578) had the highest concentration of OP at 0.131 mg/L, and Location 3 (1589) had the second highest concentration at 0.071 mg/L. Chloride Chloride is a key component of road salt, which is soluble and highly mobile in water. When snow and ice melt, the salt that has been applied to icy roads, parking lots, and sidewalks is conveyed with it into surface water and groundwater. Elevated chloride levels can affect our drinking water supplies and can be toxic to aquatic organisms. The chloride water quality standard for 2B lakes is a 4-day average of 230 mg/L for chronic toxicity and 860 mg/L as the maximum standard toxicity. Wachter and Birger use these standards, and other monitoring locations they are provided for comparative purposes. Chloride sampling was implemented City-wide in 2016, with snowmelt sampling being conducted at select basins in 2016, 2018, 2019, and 2020. The chloride results are plotted on Chart 3.7 below, with snowmelt samples highlighted in blue. Additionally, chloride charts for the individual basins are included as Attachment C. The results of the chloride sampling show that all locations follow seasonal trends, with elevated levels in the winter and spring and lower levels throughout the growing season. Location 6 (578) and Location 9 (2443) have exceeded the acute chloride standard of 860 mg/L during snowmelt sampling in 2016 (Loc. 6 & 9), 2018 (Loc. 6), 2019 (Loc. 6) and 2020 (Loc. 6). These concentrations ranged from 1,080 mg/L – 3,400 mg/L. The 4-day average chronic standard of 230 mg/L was exceeded in 2016 (Loc. 6, 8, 9), 2017 (Loc. 8), 2018 (Loc. 6, 7, 8, 9), 2019 (Loc. 5, 6, 7), and 2020 (Loc. 1, 6, 7) . The exceedance in 2017 occurred at Location 8 (600) in April, as there were no snow melt samples collected that year. Location 8 (600) was the only basin that exceeded the chronic standard during routine April – October pond sampling activities, which occurred in both 2017 (April) and 2018 (May). No samples exceeded the chronic standard during routine seasonal sampling in 2020. Section 3 – Results Page 16 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) Chart 3.7 – Chloride Concentrations Location 6 exhibits significant snowmelt concentrations for chlorides, but those concentrations readily decreased over the summer months. October chloride concentrations at Location 6 (578) have ranged from 3 - 5 mg/L. Similarly, Location 8 (600) has shown snowmelt and spring routine samples that have exceeded the chronic standard, but those concentrations have decreased significantly over the summer, down to 8 mg/L – 16 mg/L in October each year. In addition to elevated snowmelt chloride levels, Location 9 has the greatest growing season chloride concentrations of all the basins, while Location 6 has the highest overall average chloride concentrations. One notable observation is that Location 9 saw an increase in chloride concentrations from September to October in the past 4 years. This was also observed for the TP and OP sample results. The increase in these concentrations in t he fall could indicate that the basin is stratified over the summer. Fall mixing would result in nutrient and chloride rich bottom water being incorporated throughout the water column. Locations 6 (578), 8 (600), and 9 (2443) all contain areas of commercial and/or downtown land uses within their drainage areas, which is typically associated with higher salt use in the winter. This is reflected in the elevated chloride concentrations observed within the basins. Location 6 (578) and Location 9 (2443) are both landlocked, which results in pollutants being concentrated within those basins and not discharged downstream. The remaining monitoring locations have not had an exceedance of chloride water quality standards and have not shown any notable increasing trends with respect to chloride levels. 2020 Chloride During the 2020, the City-wide growing season chloride average concentration was 29 mg/L, which is less than the long term average of 38 mg/L. Location 2 had the lowest average chloride concentration at 11 mg/L and Location 9 had the highest average chloride concentration at 65 mg/L. All locations saw less chloride concentrations in 2020 compared to long term averages, except for Location 6 (578). Section 3 – Results Page 17 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) 3.5. Wachter Pond (Location 9) Temperature and DO Profile 2020 included specific sampling for Wachter Pond. Samples were taking both near the surface as well as near the bottom of the pond. Temperature and dissolved oxygen (DO) was also measured at one-foot intervals to provide a profile of the pond. The profiles and sampling were conducted at the deepest part of the pond, roughly 14 feet, and can be found in Chart 3.8 below. Depth sampling was conducted using a Van Dorn water sampler. Chart 3.8 – Wachter Depth Profile Monitoring Results for Location 9 (Wachter) 7/7/2020 8/3/2020 9/16/2020 Testing Depth (ft) DO (mg/L) Temp (⁰C) DO (mg/L) Temp (⁰C) DO (mg/L) Temp (⁰C) Surface 11.3 29.9 10.2 22.3 9.3 20.2 1 11.5 29.6 10.3 21.9 9.5 20.0 2 11.3 28.4 10.8 21.5 10.3 19.0 3 14.5 26.1 9.8 20.9 9.9 18.9 4 7.6 24.4 9.1 20.1 8.7 18.3 5 2.8 23.3 8.7 19.6 7.1 17.9 6 0.5 21.9 2.2 19.0 1.9 17.3 7 0.1 20.9 0.7 18.3 0.3 17.0 8 0.1 19.4 0.5 17.2 0.2 16.9 9 0.1 17.6 0.1 16.1 0.2 16.9 10 0.0 15.6 0.1 15.8 0.2 16.9 11 0.0 14.0 0.1 15.2 0.2 16.6 12 0.0 13.3 0.1 14.8 0.2 16.5 13 0.0 12.0 0.0 14.5 0.2 16.2 14 0.0 11.0 0.0 14.0 0.2 14.2 DO levels can influence the internal recycling of phosphorus from the pond bottom. A lack of oxygen in lower levels of the pond throughout the summer can release dissolved forms of phosphorus (ortho phosphorus) and may lead to algal blooms. During the 2020 sampling season the pond had consistent DO levels, dropping off between 5 and 6 feet of depth. The surface levels are plenty high to support aquatic life, but due to the DO levels dropping off mid-way through the water column could release excess phosphorus. Water quality sampling at depth are presented below in Chart 3.9 and 3.10. Section 3 – Results Page 18 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) Chart 3.9 – Wachter TP Depth Sampling Chart 3.10 – Wachter OP Depth Sampling Phosphorus levels can be expected to be higher at depths with natural decay of debris and Charts 3.9 and 3.10 show how the surface sampling can show a very different picture than the depth sampling . The TP and OP results are similar results to a lake that turns over twice in a year, having substantially higher levels on the bottom than the surface (MPCA 2005). OP on average made up 60% of the TP on the bottom of this pond (Loc. 9). Comparing the OP results with he DO profile results gives evidence that the bottom of this pond is releasing phosphorus due to lack of oxygen at depth. Section 4 – Conclusions Page 19 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) 4. CONCLUSIONS Eleven basins were monitored for water level and water quality to provide the City with empirical data that can be used to help guide stormwater management activities. A summary of the notable findings from the monitoring activities are provided below: Water Level Monitoring • Landlocked basins Location 9 (2443) and Location 10 (614) have shown a significant increasing trend in minimum, maximum, and average water levels over the long-term monitoring period. Management activities at those sites should be evaluated to ensure adequate storage capacity and acceptable water levels at those sites. • The long-term City-wide R/R ratio was 0.22. This is unchanged from the previous year • Long term R/R ratios varied by site from 0.39 at Location 3 (1589) to 0.09 at Location 2 (1486). Those sites consisted of 37% and 25% impervious surfaces, respectively. • Infiltration monitoring has shown a long-term average infiltration rate of 0.063 in/hr City-wide, a 0.002 decrease from the long-term average in 2019. Annually, infiltration rates have ranged from 0.051 in/hr in 2020 to 0.077 in/hr in 2015 with a decreasing trend observed. These results are greater than the 0.03 in/hr infiltration rate identified in the City’s Non-Degradation Report. Water Quality Monitoring • In general, higher stormwater pollutant levels were observed at Location 6 (578), Location 9 (2443), and Location 10 (614). This is largely due to these basins being landlocked and pollutants staying concentrated within the basin and are not transported downstream. TSS • The long-term median concentration for TSS City-wide was 19 mg/L. The long-term median TSS concentration ranged from 6 mg/L at Location 1 (1608) to 34 mg/L at Location 10 (614). TP • The long-term median TP City wide was 0.14 mg/L which is slightly below the anticipated range for treated stormwater of 0.15 to 0.2 mg/L. The long-term median TP concentration ranged from 0.07 mg/L at Location 4 (1687) to 0.24 at Location 10 (614), which also exhibited the greatest TSS. OP • The long-term OP was noticeably greater at Location 6 (578), than the other monitored basins. Location 6 (578) had the highest OP concentration in 2020 at 0.131 mg/L. The drainage area to that basin includes a large area of open park space. Chloride • The results of the chloride sampling have shown that Location 6 (578) and Location 9 (2443) have exceeded the acute chloride standard of 860 mg/L during snowmelt sa mpling in 2016 (Loc. 6 & 9), 2018 (Loc. 6), 2019 (Loc. 6), and 2020 (Loc. 6). These concentrations ranged from 1,080 mg/L – 3,400 mg/L. • Locations 6 (578) and 9 (2443) contain areas of commercial and/or downtown land uses within their drainage areas, which is typically associated with higher salt use in the winter. This is reflected in the elevated chloride concentrations observed within the basins. Location 9 (2443) is landlocked which is likely contributing to the increasing trend in chloride levels at that Location. Section 5 – References Page 20 ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) 5. REFERENCES Minnesota Pollution Control Agency. 2015. Chloride Monitoring Guidance for Streams and Stormsewers. https://www.pca.state.mn.us/sites/default/files/wq-iw11-06v.pdf. Accessed 01 Nov. 2018. Waschbusch, R.J., W.R. Selbig, and R.T. Bannerman. 1999. Sources of Phosphorus in Stormwater and Street Dirt from Two Urban Residential Basins In Madison, Wisconsin, 1994–95. U.S. Geological Survey Water-Resources Investigations Report 99–4021. WSB. 2007. City of Rosemount Non-Degradation Study. Minnesota Pollution Control Agency. 2005. Minnesota Lake Water Quality Assessment Report: Developing Nutrient Criteria. https://www.pca.state.mn.us/sites/default/files/lwq-a- nutrientcriteria.pdf . Accessed 04 Jan. 2021. Appendix ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) Attachment A – Monitoring/Water Surface Management Elevation Map (2003) Appendix ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) Attachment B – 2020 Water Level Tables and Charts B.1 2020 Water Levels B.2 2020 Rainfall to Runoff Tables and Charts B.3 2020 Evaporation & Infiltration Tables 2020 Water Quality Quantity Monitoring Program 0 0.5 1 1.5 2 2.5 3 3.5 905.0 905.5 906.0 906.5 907.0 907.5 908.0 908.5 909.0 909.5 910.0 Daily Rainfall (inches) Surface Water Elevation (ft)Monitoring Location # 1 (Marcotte #1408) Surface Water Elevation & Rainfall Water Elevation (feet) Daily Rainfall (in.) Pump 2 On = 907.0' NWL/Pumps Off = 905.5' Pump 1 On = 906.5' High Water Level = 909.42' 2020 Water Quality Quantity Monitoring Program 0 0.5 1 1.5 2 2.5 3 3.5 4 923.0 924.0 925.0 926.0 927.0 928.0 929.0 930.0 Daily Rainfall (inches)Surface Water Elevation (ft)Monitoring Location # 2 (Glendalough #1486) Surface Water Elevations & Rainfall Amounts Water Elevation (feet) Rainfall Pump 1 Off /NWL = 926.0' -High Water Elevation = 935.3' Pump 1 On/Pump 2 Off Level = 927.5' Pump 2 On Level = 930.0' 2020 Water Quality Quantity Monitoring Program 0 0.5 1 1.5 2 2.5 3 3.5 4 917.0 919.0 921.0 923.0 925.0 927.0 929.0 931.0 933.0 935.0 Daily Rainfall (inches)Surface Water Elevation (ft)Monitoring Location # 3 (Trailer Park #1589) Surface Water Elevation & Rainfall Water Surface Elevation (WSE) NWL Outlet Elevation Outlet Elevation = 935.7' NWL = 928' High Water Elevation = 940.68' 2020 Water Quality Quantity Monitoring Program 0.01 0 0 0 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 927.0 928.0 929.0 930.0 931.0 932.0 933.0 934.0 Rainfall(Inches per Day)Surface Water Elevation (ft)Monitoring Location # 4 (Unnamed #1687) Surface Water Elevation & Rainfall NWL Water Surface Elevation (WSE) Closed OCS Elevation Rainfall NWL = 929.74' -High water elevation = 940.03' OCS Closed Gate Valve Outlet Elevation = 932' 2020 Water Quality Quantity Monitoring Program 0.01 0 0 0 0 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 911.0 912.0 913.0 914.0 915.0 916.0 917.0 918.0 919.0 920.0 Rainfall(Inches per Day)Surface Water Elevation (ft)Monitoring Location # 5 (Regional #1716) Surface Water Elevations & Rainfall Amounts Water Surface Elevation (WSE) Rainfall NWL= 916' Closed valve outlet elevation is 924.0" High water elevation is = 923.8' 2020 Water Quality Quantity Monitoring Program 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 918.0 918.5 919.0 919.5 920.0 920.5 921.0 921.5 922.0 Rainfall(Inches per Day)Surface Water Elevation (ft)Monitoring Location # 6 (Erickson #579) Surface Water Elevations & Rainfall Amounts Water Surface Elevation Wetland Water Elevation No outlet NWL = 923, HWL = 933.73 ** Discharge from the pond to the adjacent wetland has been observed through a preferntial drainage path within the wooded area seperating the basin and the wetland 2020 Splash Pad Operation: 6/4 through 9/3. Pond Outlet to Wetland = 919.69' Observed Discharge Point from Pond to Wetland = 919.09'** 2020 Water Quality Quantity Monitoring Program 0 0 0 0 0 0 0 0 0 0 0 0 0 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 905.0 906.0 907.0 908.0 909.0 910.0 911.0 912.0 913.0 Rainfall(Inches per Day)Surface Water Elevation (ft)Change per HourMonitoring Location # 7 (Bloomfield #1864) Surface Water Elevations & Rainfall Amounts NWL Water Surface Elevation (WSE) Rainfall NWL = 909.0 High Water Elevation: 913.89' 2020 Water Quality Quantity Monitoring Program 0 0 0 0 0 0 0 0 0 0 0 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 928.0 928.5 929.0 929.5 930.0 930.5 931.0 931.5 932.0 932.5 Rainfall(Inches per Day)Surface Water Elevation (ft)Monitoring Location # 8 (O'Leary's #600) Surface Water Elevations & Rainfall Amounts Outlet Elevation Water Surface Elevation (WSE) Rainfall Outlet Elevation = 929.7' High Water Elevation = 935.04' 2020 Water Quality Quantity Monitoring Program 0 0 0 0 0 0 0.5 1 1.5 2 2.5 3 3.5 908.0 910.0 912.0 914.0 916.0 918.0 920.0 Surface Water Elevation (ft)Change per HourMonitoring Location # 9 (Wachter #2443) Surface Water Elevations & Rainfall Amounts Bottom of Post Pumping Required Water Surface Elevation (WSE) OHWL 5-Day Monitoring Rainfall High Water Elevation 926.65' No Outlet Pumping Required = 916' 5-Day Monitoring Required = 910' NWL = 906' OHWL = 911' 2020 Water Quality Quantity Monitoring Program 0 0.5 1 1.5 2 2.5 3 3.5 914.0 915.0 916.0 917.0 918.0 919.0 920.0 921.0 922.0 923.0 924.0 925.0 926.0 927.0 928.0 929.0 930.0 Surface Water Elevation (ft)Monitoring Location # 10 (Shannon# 614) Surface Water Elevations & Rainfall Amounts Rainfall Water Surface Elevation (WSE) HWL/ 5-Day Monitoring Required NWL Outlet Elevation = None NWL = 914' HWL/ 5-Day Monitoring Required = 920.2' 2020 Water Quality Quantity Monitoring Program 0 0.5 1 1.5 2 2.5 3 3.5 4 910.0 912.0 914.0 916.0 918.0 920.0 Daily Rainfall (inches)Surface Water Elevation (ft)Monitoring Location #11 (#1710) Surface Water Elevations & Rainfall Amounts Surface Water Elevation NWL Rainfall NWL = 918.5' 3-cell pond system outlet elevation = 923' High Water Elevation = 923' Rainfall to Runoff Ratio Data for: Monitoring Location # 1 (Marcotte #1408) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Rain Event Rainfall Event (in) Start Elevation (ft) End Elevation (ft) Duration of Period (hr) Hourly Average E/I (ft/hr) Pond Area (ac) Runoff Inflow Volume* (ac-ft) Watershed Area (ac)Runoff (in) Rainfall / Runoff Ratio 5-Jun 0.11 907.94 907.94 7 0.0021 1.90 0.04 27.4 0.016 0.15 6-Jun 0.67 907.87 907.98 11 0.0021 1.90 0.26 27.4 0.114 0.17 9-Jun 0.4 907.92 907.97 10 0.0021 1.90 0.15 27.4 0.066 0.16 18-Jun 1.58 907.56 908.05 22 0.0021 1.90 1.01 27.4 0.444 0.28 21-Jun 0.31 908.00 908.05 6 0.0021 1.90 0.12 27.4 0.050 0.16 28-Jun 3.59 907.70 908.49 22 0.0021 1.90 1.59 27.4 0.697 0.19 6-Jul 0.85 907.83 907.98 2 0.0021 1.90 0.30 27.4 0.131 0.15 11-Jul 0.15 907.99 908.02 4 0.0021 1.90 0.07 27.4 0.029 0.20 18-Jul 1.08 907.73 908.03 27 0.0021 1.90 0.67 27.4 0.293 0.27 21-Jul 0.53 907.94 908.03 21 0.0021 1.90 0.26 27.4 0.116 0.22 25-Jul 0.99 907.70 907.96 33 0.0021 1.90 0.62 27.4 0.270 0.27 1-Aug 0.18 907.67 907.70 1 0.0021 1.90 0.06 27.4 0.025 0.14 9-Aug 0.91 907.35 907.52 9 0.0021 1.90 0.36 27.4 0.159 0.17 12-Aug 0.43 907.41 907.47 9 0.0021 1.90 0.14 27.4 0.062 0.14 14-Aug 0.11 907.36 907.39 4 0.0021 1.90 0.07 27.4 0.030 0.28 17-Aug 0.15 907.29 907.31 5 0.0021 1.90 0.07 27.4 0.029 0.20 21-Aug 0.35 907.08 907.14 8 0.0021 1.90 0.13 27.4 0.057 0.16 28-Aug 1.01 906.88 907.09 3 0.0021 1.90 0.42 27.4 0.186 0.18 31-Aug 0.52 907.08 907.16 7 0.0021 1.90 0.18 27.4 0.078 0.15 6-Sep 0.26 906.90 906.92 5 0.0021 1.90 0.06 27.4 0.025 0.09 7-Sep 0.41 906.87 906.91 9 0.0021 1.90 0.10 27.4 0.042 0.10 9-Sep 0.17 906.86 906.91 9 0.0021 1.90 0.13 27.4 0.057 0.34 11-Oct 1.46 905.86 906.11 12 0.0021 1.90 0.53 27.4 0.233 0.16 * E/I = Evaporation and infiltration rate included in volume calculation Range of Rainfall to Runoff Ratios 0.09 0.34 Rainfall to Runoff Ratio Based on Linear Regression 0.20 y = 0.207x R² = 0.942 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0 0.5 1 1.5 2 2.5 3 3.5 4Runoff (in)Rainfall (in) Monitoring Location # 1 (Marcotte #1408) Rainfall to Runoff Relationship Linear (Rainfall to Runoff Ratio) Rainfall to Runoff Ratio Data for: Monitoring Location # 2 (Glendalough #1486) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Rain Event Rainfall Event (in) Start Elevation (ft) End Elevation (ft) Duration of Period (hr) Pond Area (ac) Runoff Inflow Volume* (ac-ft) Watershed Area (ac)Runoff (in)Rainfall / Runoff Ratio 6-Jun 0.66 924.60 924.88 8 1.39 0.39 143.3 0.033 0.05 9-Jun 0.39 924.64 924.93 6 1.39 0.41 143.3 0.034 0.09 18-Jun 1.58 924.11 925.08 21 1.39 1.34 143.3 0.113 0.07 21-Jun 0.30 924.87 925.14 5 1.39 0.38 143.3 0.032 0.11 28-Jun 3.05 924.40 926.87 11 1.39 3.44 143.3 0.288 0.09 6-Jul 0.85 924.88 925.13 3 1.39 0.35 143.3 0.029 0.03 11-Jul 0.15 924.68 924.72 3 1.39 0.06 143.3 0.005 0.03 18-Jul 1.07 924.36 925.00 3 1.39 0.88 143.3 0.074 0.07 21-Jul 0.52 924.75 924.91 6 1.39 0.23 143.3 0.019 0.04 25-Jul 0.99 924.63 924.92 19 1.39 0.40 143.3 0.034 0.03 1-Aug 0.18 924.55 924.60 3 1.39 0.08 143.3 0.007 0.04 9-Aug 0.91 924.26 924.72 13 1.39 0.64 143.3 0.054 0.06 12-Aug 0.43 924.61 924.75 11 1.39 0.19 143.3 0.016 0.04 14-Aug 0.11 924.66 924.70 3 1.39 0.06 143.3 0.005 0.04 17-Aug 0.15 924.60 924.65 4 1.39 0.06 143.3 0.005 0.03 21-Aug 0.35 924.44 924.56 8 1.39 0.16 143.3 0.014 0.04 28-Aug 1.01 924.34 925.03 7 1.39 0.95 143.3 0.080 0.08 31-Aug 0.52 924.79 924.95 9 1.39 0.21 143.3 0.018 0.03 6-Sep 0.26 924.63 924.70 6 1.39 0.09 143.3 0.007 0.03 7-Sep 0.41 924.64 924.75 9 1.39 0.15 143.3 0.012 0.03 11-Sep 0.16 924.57 924.59 13 1.39 0.03 143.3 0.003 0.02 11-Oct 1.46 923.81 924.63 13 1.39 1.14 143.3 0.095 0.07 * E/I = Evaporation and infiltration rate included in volume calculation Range of Rainfall to Runoff Ratios 0.02 0.11 Rainfall to Runoff Ratio Based on Linear Regression 0.08 y = 0.075x R² = 0.889 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50Runoff (in)Rainfall (in) Monitoring Location # 2 (Glendalough #1486) Rainfall to Runoff Relationship Linear (Rainfall to Runoff Ratio) Rainfall to Runoff Ratio Data for: Monitoring Location # 3 (Trailer Park #1589) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Rain Event Rainfall Event (in) Start Elevation (ft) End Elevation (ft) Duration of Period (hr) Pond Area (ac) Runoff Inflow Volume* (ac-ft) Watershed Area (ac)Runoff (in)Rainfall / Runoff Ratio 6-Jun 0.66 923.90 925.24 8 0.87 1.16 38.3 0.364 0.55 9-Jun 0.39 924.33 924.82 8 0.87 0.43 38.3 0.135 0.35 18-Jun 1.54 923.31 926.09 6 0.87 2.42 38.3 0.760 0.49 21-Jun 0.31 924.32 925.10 7 0.87 0.68 38.3 0.212 0.68 28-Jun 3.59 923.93 927.33 30 0.87 2.96 38.3 0.928 0.26 6-Jul 0.85 924.26 925.02 6 0.87 0.66 38.3 0.206 0.24 11-Jul 0.15 924.02 924.28 5 0.87 0.22 38.3 0.069 0.46 14-Jul 0.09 923.89 923.97 4 0.87 0.07 38.3 0.022 0.25 18-Jul 1.07 923.71 925.72 3 0.87 1.75 38.3 0.548 0.51 21-Jul 0.51 924.55 925.23 4 0.87 0.59 38.3 0.186 0.36 25-Jul 0.99 924.30 925.47 19 0.87 1.02 38.3 0.318 0.32 1-Aug 0.18 924.16 924.47 3 0.87 0.27 38.3 0.085 0.47 9-Aug 0.91 923.80 925.74 10 0.87 1.68 38.3 0.528 0.58 12-Aug 0.43 924.82 925.31 11 0.87 0.42 38.3 0.132 0.31 14-Aug 0.11 924.79 924.98 3 0.87 0.16 38.3 0.050 0.45 17-Aug 0.15 924.55 924.69 4 0.87 0.12 38.3 0.038 0.25 21-Aug 0.35 924.18 924.67 8 0.87 0.42 38.3 0.133 0.38 28-Aug 1.01 924.06 925.76 8 0.87 1.49 38.3 0.466 0.46 31-Aug 0.52 924.82 925.40 9 0.87 0.50 38.3 0.158 0.30 6-Sep 0.26 924.34 924.59 7 0.87 0.22 38.3 0.069 0.26 7-Sep 0.41 924.42 924.86 11 0.87 0.38 38.3 0.119 0.29 11-Sep 0.17 924.41 924.48 15 0.87 0.06 38.3 0.020 0.12 24-Sep 0.08 923.54 923.66 5 0.87 0.10 38.3 0.032 0.40 11-Oct 1.46 923.36 925.86 11 0.87 2.18 38.3 0.683 0.47 17-Oct 0.08 924.46 924.52 4 0.87 0.05 38.3 0.014 0.18 * E/I = Evaporation and infiltration rate included in volume calculation 0.35 Rainfall to Runoff Ratio Based on Linear Regression Range of Rainfall to Runoff Ratios 0.12 0.68 y = 0.345x R² = 0.803 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 0 0.5 1 1.5 2 2.5 3 3.5 4Runoff (in)Rainfall (in) Monitoring Location # 3 (Trailer Park #1589) Rainfall to Runoff Relationship Linear (Rainfall to Runoff Ratio) Rainfall to Runoff Ratio Data for: Monitoring Location # 4 (Unnamed #1687) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Rain Event Rainfall Event (in) Start Elevation (ft)End Elevation (ft)Duration of Period (hr)Pond Area (ac)Runoff Inflow Volume* (ac-ft) Watershed Area (ac)Runoff (in)Rainfall / Runoff Ratio 6-Jun 0.64 929.43 929.93 5 0.55 0.29 58.8 0.058 0.09 9-Jun 0.39 929.42 929.65 6 0.55 0.14 58.8 0.029 0.07 18-Jun 1.48 929.33 930.51 3 0.55 0.66 58.8 0.134 0.09 21-Jun 0.27 929.41 929.68 3 0.55 0.16 58.8 0.032 0.12 28-Jun 3.22 929.42 932.55 15 0.55 1.77 58.8 0.360 0.11 6-Jul 0.85 929.45 929.81 3 0.55 0.20 58.8 0.042 0.05 11-Jul 0.15 929.54 929.65 3 0.55 0.07 58.8 0.014 0.09 18-Jul 1.06 929.52 930.54 2 0.55 0.57 58.8 0.117 0.11 21-Jul 0.52 929.90 930.14 6 0.55 0.15 58.8 0.030 0.06 25-Jul 0.99 929.93 930.05 25 0.55 0.13 58.8 0.026 0.03 1-Aug 0.18 929.53 929.72 14 0.55 0.14 58.8 0.029 0.16 9-Aug 0.91 929.40 930.35 10 0.55 0.55 58.8 0.113 0.12 12-Aug 0.37 929.13 929.36 4 0.55 0.13 58.8 0.027 0.07 14-Aug 0.11 929.52 929.72 4 0.55 0.12 58.8 0.024 0.22 17-Aug 0.15 929.11 929.18 4 0.55 0.05 58.8 0.010 0.07 21-Aug 0.35 929.00 929.45 9 0.55 0.27 58.8 0.056 0.16 28-Aug 1.01 928.80 929.82 4 0.55 0.57 58.8 0.117 0.12 31-Aug 0.52 928.98 929.33 7 0.55 0.21 58.8 0.044 0.08 6-Sep 0.26 928.94 929.05 6 0.55 0.08 58.8 0.016 0.06 7-Sep 0.41 928.95 929.19 10 0.55 0.16 58.8 0.032 0.08 24-Sep 0.08 927.90 927.93 4 0.55 0.02 58.8 0.005 0.06 11-Oct 1.46 927.17 928.70 13 0.55 0.88 58.8 0.180 0.12 * E/I = Evaporation and infiltration rate included in volume calculation Range of Rainfall to Runoff Ratios 0.03 0.22 Rainfall to Runoff Ratio Based on Linear Regression 0.10 y = 0.103x R² = 0.909 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0 0.5 1 1.5 2 2.5 3 3.5Runoff (in)Rainfall (in) Monitoring Location # 4 (Unnamed #1687) Rainfall to Runoff Relationship Linear (Rainfall to Runoff Ratio) Rainfall to Runoff Ratio Data for: Monitoring Location # 5 (Regional #1716) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Rain Event Rainfall Event (in) Start Elevation (ft)End Elevation (ft)Duration of Period (hr)Pond Area (ac) Runoff Inflow Volume* (ac-ft) Watershed Area (ac)Runoff (in)Rainfall / Runoff Ratio 6-Jun 0.78 916.38 916.87 9 2.69 1.49 169.2 0.106 0.14 9-Jun 0.39 916.44 916.65 5 2.69 0.66 169.2 0.047 0.12 18-Jun 0.68 915.82 917.31 4 2.69 4.09 169.2 0.290 0.43 21-Jun 0.3 916.33 916.64 5 2.69 0.92 169.2 0.066 0.22 28-Jun 3.05 916.07 918.65 11 2.69 7.16 169.2 0.508 0.17 6-Jul 0.85 916.69 916.96 3 2.69 0.79 169.2 0.056 0.07 11-Jul 0.15 916.47 916.59 4 2.69 0.41 169.2 0.029 0.19 18-Jul 1.07 916.37 917.12 2 2.69 2.06 169.2 0.146 0.14 21-Jul 0.52 916.41 916.82 7 2.69 1.24 169.2 0.088 0.17 25-Jul 0.99 916.41 916.92 18 2.69 1.71 169.2 0.121 0.12 1-Aug 0.18 916.36 916.49 3 2.69 0.39 169.2 0.028 0.16 9-Aug 0.91 916.14 917.04 9 2.69 2.60 169.2 0.184 0.20 12-Aug 0.38 916.38 916.60 5 2.69 0.70 169.2 0.050 0.13 14-Aug 0.11 916.36 916.46 3 2.69 0.31 169.2 0.022 0.20 17-Aug 0.14 916.31 916.34 3 2.69 0.16 169.2 0.011 0.08 21-Aug 0.35 916.07 916.29 6 2.69 0.69 169.2 0.049 0.14 28-Aug 1.01 916.02 916.91 2 2.69 2.45 169.2 0.174 0.17 31-Aug 0.52 916.32 916.63 8 2.69 0.99 169.2 0.070 0.13 6-Sep 0.26 916.22 916.34 7 2.69 0.48 169.2 0.034 0.13 7-Sep 0.41 916.30 916.49 9 2.69 0.69 169.2 0.049 0.12 11-Oct 1.36 915.29 916.87 6 2.69 4.36 169.2 0.310 0.23 * E/I = Evaporation and infiltration rate included in volume calculation Range of Rainfall to Runoff Ratios 0.07 0.43 Rainfall to Runoff Ratio Based on Linear Regression 0.17 y = 0.170x R² = 0.828 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0 0.5 1 1.5 2 2.5 3 3.5Runoff (in)Rainfall (in) Monitoring Location # 5 (Regional #1716) Rainfall to Runoff Relationship Linear (Rainfall to Runoff Ratio) Rainfall to Runoff Ratio Data for: Monitoring Location # 6 (Erickson #579) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Rain Event Rainfall Event (in) Start Elevation (ft) End Elevation (ft) Duration of Period (hr) Pond Area (ac) Runoff Inflow Volume (ac-ft) Watershed Area (ac)Runoff (in)Rainfall / Runoff Ratio 5-Jun 0.11 919.15 919.41 27 2.26 0.63 134.6 0.057 0.51 6-Jun 0.67 919.28 919.52 13 2.26 0.57 134.6 0.051 0.08 9-Jun 0.39 919.31 919.73 9 2.26 0.99 134.6 0.088 0.23 18-Jun 1.54 919.45 920.01 15 2.26 1.30 134.6 0.115 0.07 21-Jun 0.3 919.41 919.70 10 2.26 0.67 134.6 0.060 0.20 28-Jun 3.59 919.22 921.40 29 2.26 5.00 134.6 0.445 0.12 6-Jul 0.85 919.46 919.68 14 2.26 0.51 134.6 0.046 0.05 11-Jul 0.15 919.61 919.77 12 2.26 0.39 134.6 0.035 0.23 18-Jul 1.06 919.53 919.90 2 2.26 0.84 134.6 0.075 0.07 21-Jul 0.53 919.61 919.80 12 2.26 0.45 134.6 0.040 0.08 25-Jul 0.6 919.80 920.06 14 2.26 0.62 134.6 0.055 0.09 1-Aug 0.18 919.54 919.80 10 2.26 0.60 134.6 0.053 0.30 9-Aug 0.91 919.65 920.03 9 2.26 0.87 134.6 0.077 0.08 12-Aug 0.34 919.56 919.86 3 2.26 0.69 134.6 0.062 0.18 17-Aug 0.14 919.60 919.70 2 2.26 0.22 134.6 0.019 0.14 21-Aug 0.23 919.67 919.85 4 2.26 0.42 134.6 0.037 0.16 28-Aug 0.98 919.58 919.94 2 2.26 0.82 134.6 0.073 0.07 31-Aug 0.46 919.70 919.91 7 2.26 0.50 134.6 0.045 0.10 6-Sep 0.22 919.43 919.66 3 2.26 0.52 134.6 0.047 0.21 7-Sep 0.34 919.40 919.77 7 2.26 0.84 134.6 0.075 0.22 11-Sep 0.12 919.13 919.30 9 2.26 0.40 134.6 0.036 0.30 24-Sep 0.08 919.01 919.09 4 2.26 0.17 134.6 0.015 0.19 11-Oct 1.43 918.97 919.64 10 2.26 1.53 134.6 0.137 0.10 * E/I = Evaporation and infiltration rate included in volume calculation Range of Rainfall to Runoff Ratios 0.05 0.51 Rainfall to Runoff Ratio Based on Linear Regression 0.11 y = 0.109x R² = 0.862 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0 0.5 1 1.5 2 2.5 3 3.5 4Runoff (in)Rainfall (in) Monitoring Location # 6 (Erickson #579) Rainfall to Runoff Relationship Linear (Rainfall to Runoff Ratio) Rainfall to Runoff Ratio Data for: Monitoring Location # 7 (Bloomfield #1864) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Rain Event Rainfall Event (in) Start Elevation (ft) End Elevation (ft) Duration of Period (hr)Pond Area (ac) Runoff Inflow Volume* (ac-ft) Watershed Area (ac)Runoff (in)Rainfall / Runoff Ratio 6-Jun 0.51 908.38 909.46 4 0.79 0.86 37.3 0.277 0.54 9-Jun 0.39 908.56 908.75 6 0.79 0.16 37.3 0.052 0.13 18-Jun 1.33 908.27 909.55 2 0.79 1.01 37.3 0.326 0.25 21-Jun 0.3 908.63 908.89 5 0.79 0.21 37.3 0.067 0.22 28-Jun 2.9 908.46 910.44 10 0.79 1.59 37.3 0.510 0.18 6-Jul 0.85 908.64 908.69 3 0.79 0.04 37.3 0.014 0.02 11-Jul 0.15 908.55 908.62 4 0.79 0.06 37.3 0.020 0.13 18-Jul 1.07 908.46 909.03 2 0.79 0.45 37.3 0.146 0.14 21-Jul 0.51 908.72 909.10 3 0.79 0.31 37.3 0.099 0.19 25-Jul 0.87 908.72 909.15 12 0.79 0.37 37.3 0.117 0.13 1-Aug 0.18 908.63 908.75 2 0.79 0.10 37.3 0.031 0.17 9-Aug 0.91 908.55 909.29 8 0.79 0.60 37.3 0.193 0.21 12-Aug 0.38 908.87 909.01 5 0.79 0.12 37.3 0.038 0.10 14-Aug 0.11 908.81 908.95 3 0.79 0.11 37.3 0.036 0.32 17-Aug 0.15 908.77 908.81 4 0.79 0.04 37.3 0.013 0.09 21-Aug 0.35 908.63 908.78 6 0.79 0.12 37.3 0.040 0.11 28-Aug 1.01 908.59 909.12 2 0.79 0.42 37.3 0.135 0.13 31-Aug 0.52 908.83 909.09 8 0.79 0.22 37.3 0.072 0.14 6-Sep 0.26 908.72 908.80 6 0.79 0.08 37.3 0.024 0.09 7-Sep 0.41 908.75 908.90 9 0.79 0.13 37.3 0.042 0.10 11-Oct 1.43 908.35 910.14 9 0.79 1.43 37.3 0.461 0.32 * E/I = Evaporation and infiltration rate included in volume calculation Range of Rainfall to Runoff Ratios 0.02 0.54 Rainfall to Runoff Ratio Based on Linear Regression 0.19 y = 0.190x R² = 0.737 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0 0.5 1 1.5 2 2.5 3 3.5Runoff (in)Rainfall (in) Monitoring Location # 7 (Bloomfield #1864) Rainfall to Runoff Relationship Linear (Rainfall to Runoff Ratio) Rainfall to Runoff Ratio Data for: Monitoring Location # 8 (O'Leary's #600) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Rain Event Rainfall Event (in) Start Elevation (ft) End Elevation (ft) Duration of Period (hr) Pond Area (ac) Runoff Inflow Volume* (ac-ft) Watershed Area (ac)Runoff (in)Rainfall / Runoff Ratio 6-Jun 0.66 930.05 930.52 8 5.56 2.61 125.5 0.250 0.38 9-Jun 0.39 930.24 930.41 5 5.56 1.00 125.5 0.096 0.25 18-Jun 1.52 929.89 930.95 4 5.56 5.91 125.5 0.565 0.37 21-Jun 0.3 930.27 930.48 5 5.56 1.19 125.5 0.114 0.38 28-Jun 3.05 930.04 932.02 12 5.56 11.04 125.5 1.056 0.35 11-Jul 0.15 929.82 929.84 4 5.56 0.16 125.5 0.015 0.10 18-Jul 1.07 929.67 930.20 3 5.56 2.96 125.5 0.283 0.26 21-Jul 0.51 930.00 930.29 3 5.56 1.61 125.5 0.154 0.30 25-Jul 0.99 929.99 930.44 18 5.56 2.58 125.5 0.247 0.25 1-Aug 0.18 929.94 930.06 2 5.56 0.63 125.5 0.060 0.34 9-Aug 0.91 929.94 930.79 8 5.56 4.73 125.5 0.452 0.50 12-Aug 0.38 930.12 930.30 5 5.56 1.00 125.5 0.096 0.25 14-Aug 0.11 930.08 930.20 3 5.56 0.64 125.5 0.061 0.56 17-Aug 0.15 930.04 930.12 3 5.56 0.47 125.5 0.045 0.30 21-Aug 0.35 929.94 930.07 6 5.56 0.74 125.5 0.070 0.20 28-Aug 1.01 929.90 930.34 2 5.56 2.48 125.5 0.237 0.23 31-Aug 0.52 930.05 930.30 7 5.56 1.44 125.5 0.138 0.27 6-Sep 0.26 929.96 930.04 5 5.56 0.47 125.5 0.045 0.17 7-Sep 0.41 929.99 930.16 10 5.56 0.98 125.5 0.094 0.23 11-Sep 0.16 930.01 930.06 13 5.56 0.33 125.5 0.032 0.20 11-Oct 1.26 929.78 930.90 4 5.56 6.24 125.5 0.597 0.47 * E/I = Evaporation and infiltration rate included in volume calculation Range of Rainfall to Runoff Ratios 0.10 0.56 Rainfall to Runoff Ratio Based on Linear Regression 0.35 y = 0.345x R² = 0.930 0.00 0.20 0.40 0.60 0.80 1.00 1.20 0 0.5 1 1.5 2 2.5 3 3.5Runoff (in)Rainfall (in) Monitoring Location # 8 (O'Leary's #600) Rainfall to Runoff Relationship Linear (Rainfall to Runoff Ratio) Rainfall to Runoff Ratio Data for: Monitoring Location # 9 (Wachter #2443) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Rain Event Rainfall Event (in) Start Elevation (ft) End Elevation (ft) Duration of Period (hr) Pond Area (ac) Runoff Inflow Volume* (ac-ft) Watershed Area (ac)Runoff (in)Rainfall / Runoff Ratio 6-Jun 0.66 914.63 915.46 7 5.10 4.41 384.8 0.137 0.21 9-Jun 0.39 914.97 915.24 7 5.10 1.56 384.8 0.049 0.12 18-Jun 1.54 914.11 916.28 7 5.10 11.27 384.8 0.352 0.23 21-Jun 0.31 915.32 915.70 6 5.10 2.09 384.8 0.065 0.21 28-Jun 3.43 914.62 919.26 16 5.10 24.10 384.8 0.751 0.22 11-Jul 0.15 914.51 914.54 4 5.10 0.30 384.8 0.009 0.06 18-Jul 1.07 913.95 914.94 7 5.10 5.22 384.8 0.163 0.15 21-Jul 0.52 914.67 915.19 8 5.10 2.88 384.8 0.090 0.17 25-Jul 0.88 914.82 915.69 17 5.10 4.90 384.8 0.153 0.17 1-Aug 0.18 914.92 915.05 5 5.10 0.84 384.8 0.026 0.15 9-Aug 0.91 914.56 916.04 15 5.10 7.98 384.8 0.249 0.27 12-Aug 0.43 915.72 915.99 9 5.10 1.65 384.8 0.051 0.12 14-Aug 0.11 915.61 915.81 5 5.10 1.16 384.8 0.036 0.33 17-Aug 0.15 915.50 915.62 5 5.10 0.73 384.8 0.023 0.15 21-Aug 0.35 915.12 915.31 7 5.10 1.14 384.8 0.036 0.10 28-Aug 1.01 914.88 915.62 6 5.10 3.94 384.8 0.123 0.12 31-Aug 0.52 915.41 915.86 10 5.10 2.60 384.8 0.081 0.16 6-Sep 0.26 915.28 915.36 5 5.10 0.59 384.8 0.018 0.07 7-Sep 0.41 915.28 915.53 12 5.10 1.61 384.8 0.050 0.12 11-Sep 0.13 915.27 915.30 9 5.10 0.43 384.8 0.013 0.10 11-Oct 1.46 913.64 915.44 13 5.10 9.53 384.8 0.297 0.20 * E/I = Evaporation and infiltration rate included in volume calculation Range of Rainfall to Runoff Ratios 0.06 0.33 Rainfall to Runoff Ratio Based on Linear Regression 0.21 y = 0.206x R² = 0.955 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0 0.5 1 1.5 2 2.5 3 3.5 4Runoff (in)Rainfall (in) Monitoring Location # 9 (Wachter #2443) Rainfall to Runoff Relationship Linear (Rainfall to Runoff Ratio) Rainfall to Runoff Ratio Data for: Monitoring Location # 10 (Shannon #614) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Rain Event Rainfall Event (in) Start Elevation (ft) End Elevation (ft) Duration of Period (hr) Pond Area (ac) Runoff Inflow Volume* (ac-ft) Watershed Area (ac)Runoff (in)Rainfall / Runoff Ratio 6-Jun 0.66 919.51 919.84 6 3.17 1.14 176.8 0.077 0.12 9-Jun 0.39 919.56 919.71 7 3.17 0.56 176.8 0.038 0.10 18-Jun 1.58 918.69 919.98 20 3.17 4.35 176.8 0.295 0.19 21-Jun 0.31 919.93 920.21 7 3.17 0.97 176.8 0.066 0.21 28-Jun 3.59 919.56 921.61 21 3.17 6.80 176.8 0.462 0.13 18-Jul 1.07 919.94 920.32 2 3.17 1.25 176.8 0.085 0.08 21-Jul 0.51 920.21 920.45 2 3.17 0.78 176.8 0.053 0.10 25-Jul 0.99 920.21 920.54 20 3.17 1.31 176.8 0.089 0.09 1-Aug 0.18 920.86 920.91 2 3.17 0.17 176.8 0.012 0.07 9-Aug 0.91 920.31 921.04 17 3.17 2.55 176.8 0.173 0.19 12-Aug 0.38 920.94 921.13 7 3.17 0.70 176.8 0.047 0.12 17-Aug 0.14 920.83 920.98 1 3.17 0.47 176.8 0.032 0.23 21-Aug 0.35 920.62 920.69 6 3.17 0.33 176.8 0.022 0.06 28-Aug 1.01 920.31 920.49 3 3.17 0.60 176.8 0.041 0.04 31-Aug 0.52 920.34 920.61 14 3.17 1.07 176.8 0.073 0.14 6-Sep 0.22 920.35 920.44 3 3.17 0.33 176.8 0.022 0.10 9-Sep 0.13 920.16 920.33 8 3.17 0.65 176.8 0.044 0.34 11-Sep 0.11 920.24 920.26 7 3.17 0.16 176.8 0.011 0.10 11-Oct 1.46 919.79 920.41 18 3.17 2.23 176.8 0.151 0.10 * E/I = Evaporation and infiltration rate included in volume calculation Range of Rainfall to Runoff Ratios 0.04 0.34 Rainfall to Runoff Ratio Based on Linear Regression 0.13 y = 0.126x R² = 0.878 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0 0.5 1 1.5 2 2.5 3 3.5 4Runoff (in)Rainfall (in) Monitoring Location # 10 (Shannon #614) Rainfall to Runoff Relationship Linear (Rainfall to Runoff Ratio) Rainfall to Runoff Ratio Data for: Monitoring Location # 11 (#1710) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Rain Event Rainfall Event (in)Start Elevation (ft)End Elevation (ft)Duration of Period (hr)Pond Area (ac) Runoff Inflow Volume* (ac-ft) Watershed Area (ac)Runoff (in)Rainfall / Runoff Ratio 5-Jun 0.11 915.90 915.99 7 0.58 0.08 49.9 0.019 0.17 6-Jun 0.64 915.82 916.98 5 0.58 0.69 49.9 0.166 0.26 9-Jun 0.39 916.01 916.49 5 0.58 0.30 49.9 0.071 0.18 18-Jun 1.52 915.72 917.63 4 0.58 1.13 49.9 0.271 0.18 21-Jun 0.27 916.17 917.05 3 0.58 0.53 49.9 0.127 0.47 28-Jun 3.51 915.77 918.18 17 0.58 1.47 49.9 0.353 0.10 6-Jul 0.85 916.24 916.51 4 0.58 0.17 49.9 0.041 0.05 11-Jul 0.15 916.11 916.38 4 0.58 0.17 49.9 0.042 0.28 18-Jul 1.07 916.04 916.83 3 0.58 0.47 49.9 0.113 0.11 21-Jul 0.52 916.33 917.08 16 0.58 0.50 49.9 0.119 0.23 25-Jul 0.99 916.37 916.73 20 0.58 0.29 49.9 0.069 0.07 1-Aug 0.18 916.30 916.45 3 0.58 0.10 49.9 0.025 0.14 9-Aug 0.91 916.05 916.74 8 0.58 0.43 49.9 0.103 0.11 12-Aug 0.38 916.37 916.72 5 0.58 0.23 49.9 0.054 0.14 14-Aug 0.11 916.43 916.92 6 0.58 0.31 49.9 0.074 0.68 17-Aug 0.14 916.40 916.45 3 0.58 0.04 49.9 0.009 0.06 21-Aug 0.35 916.18 916.47 6 0.58 0.19 49.9 0.047 0.13 28-Aug 0.98 916.24 916.68 1 0.58 0.26 49.9 0.062 0.06 31-Aug 0.33 916.44 916.77 5 0.58 0.22 49.9 0.052 0.16 6-Sep 0.26 916.20 916.46 5 0.58 0.17 49.9 0.040 0.16 7-Sep 0.41 916.38 916.90 15 0.58 0.36 49.9 0.087 0.21 11-Oct 1.36 915.46 917.91 6 0.58 1.45 49.9 0.349 0.26 * E/I = Evaporation and infiltration rate included in volume calculation Range of Rainfall to Runoff Ratios 0.05 0.68 Rainfall to Runoff Ratio Based on Linear Regression 0.13 y = 0.126x R² = 0.592 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0 0.5 1 1.5 2 2.5 3 3.5 4Runoff (in)Rainfall (in) Monitoring Location # 11 (1710) Rainfall to Runoff Relationship Linear (Rainfall to Runoff Ratio) Infiltration and Evaporation Rates for: Monitoring Location # 1 (Marcotte #1408) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Period of no Rainfall Beginning Elevation (ft) Ending Elevation (ft) Change in Elevation (ft) Duration of Period (hr) Evaporation & Infiltration Rate* (in/hr) Pond Area (ac) Overall Volume Reduction within Period (ac-ft) 6/3--6/4 907.98 907.91 0.07 23.0 0.037 1.90 0.13 6/5--6/6 907.93 907.86 0.07 26.0 0.034 1.90 0.14 6/7--6/9 907.98 907.90 0.08 51.0 0.018 1.90 0.15 6/10--6/18 907.96 907.56 0.40 195.0 0.025 1.90 0.77 6/20--6/21 908.07 907.99 0.08 35.0 0.028 1.90 0.15 6/22--6/26 908.04 907.82 0.22 105.0 0.025 1.90 0.42 7/2--7/6 907.90 907.81 0.09 95.0 0.011 1.90 0.17 7/9--7/11 908.06 908.00 0.06 35.0 0.021 1.90 0.12 7/12--7/14 907.98 907.87 0.11 41.0 0.032 1.90 0.21 7/15--7/17 907.88 907.76 0.12 56.0 0.025 1.90 0.22 7/19--7/21 908.02 907.91 0.11 45.0 0.030 1.90 0.21 7/22--7/25 907.84 907.70 0.15 66.0 0.027 1.90 0.28 7/28--8/1 907.89 907.68 0.21 89.0 0.028 1.90 0.40 8/2--8/8 907.70 907.38 0.32 155.0 0.024 1.90 0.60 8/10--8/12 907.52 907.41 0.10 47.0 0.026 1.90 0.20 8/12--8/14 907.47 907.37 0.10 47.0 0.026 1.90 0.19 8/15--8/16 907.38 907.28 0.10 44.0 0.028 1.90 0.20 8/17--8/21 907.30 907.08 0.22 106.0 0.025 1.90 0.43 8/25--8/28 907.01 906.86 0.15 70.0 0.026 1.90 0.29 8/29--8/31 907.16 907.08 0.08 42.0 0.024 1.90 0.16 9/1--9/5 907.13 906.89 0.25 104.0 0.029 1.90 0.47 9/8--9/9 906.92 906.85 0.07 30.0 0.028 1.90 0.13 9/10--9/11 906.91 906.84 0.07 42.0 0.019 1.90 0.13 9/12--9/24 906.84 906.39 0.45 281.0 0.019 1.90 0.86 9/24--9/27 906.41 906.29 0.12 81.0 0.017 1.90 0.22 9/28--9/30 906.27 906.19 0.09 48.0 0.022 1.90 0.16 10/2--10/11 906.17 905.84 0.33 231.0 0.017 1.90 0.63 10/12--10/14 906.11 906.04 0.07 29.0 0.030 1.90 0.14 10/14--10/16 906.04 905.95 0.09 41.0 0.026 1.90 0.17 10/18--10/19 905.94 905.87 0.07 32.0 0.026 1.90 0.13 SUM = 8.45 * Evaporation and Infiltration rates were selected from periods on no rain. Range of Evaporation and Infiltration Rates (in/hr)0.011 0.037 Average Evaporation and Infiltration Rate (in/hr)0.025 Infiltration and Evaporation Rates for: Monitoring Location # 2 (Glendalough #1486) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Period of no Rainfall Beginning Elevation (ft) Ending Elevation (ft) Change in Elevation (ft) Duration of Period (hr) Evaporation & Infiltration Rate* (in/hr) Pond Area (ac) Overall Volume Reduction within Period (ac-ft) 6/3--6/5 924.97 924.75 0.23 49 0.055 1.39 0.31 6/5--6/6 924.74 924.60 0.13 32 0.051 1.39 0.19 6/7--6/9 924.87 924.69 0.17 43 0.049 1.39 0.24 6/9--6/18 924.73 924.14 0.59 197 0.036 1.39 0.82 6/19--6/21 925.08 924.88 0.20 46 0.051 1.39 0.27 6/21--6/26 925.11 924.63 0.49 109 0.054 1.39 0.68 6/26--6/28 924.54 924.40 0.14 53 0.032 1.39 0.20 6/29--7/6 926.14 924.88 1.26 160 0.094 1.39 1.75 7/6--7/11 925.13 924.68 0.45 113 0.048 1.39 0.62 7/12--7/14 924.70 924.51 0.19 61 0.037 1.39 0.26 7/14--7/17 924.54 924.40 0.14 60 0.029 1.39 0.20 7/18--7/21 924.99 924.76 0.23 70 0.040 1.39 0.32 7/21--7/25 924.91 924.63 0.28 96 0.035 1.39 0.39 7/26--7/28 924.92 924.80 0.11 39 0.035 1.39 0.16 7/28--8/1 924.81 924.55 0.26 106 0.029 1.39 0.36 8/1--8/8 924.60 924.28 0.32 163 0.023 1.39 0.44 8/10--8/12 924.72 924.62 0.10 46 0.026 1.39 0.14 8/12--8/14 924.75 924.66 0.09 46 0.023 1.39 0.12 8/15--8/17 924.70 924.61 0.09 48 0.023 1.39 0.13 8/17--8/21 924.65 924.44 0.20 111 0.022 1.39 0.28 8/22--8/28 924.56 924.34 0.22 141 0.019 1.39 0.30 8/28--8/31 925.02 924.79 0.22 60 0.045 1.39 0.31 8/31--9/5 924.94 924.64 0.30 131 0.028 1.39 0.42 9/9--9/11 924.65 924.57 0.07 45 0.020 1.39 0.10 9/12--9/24 924.59 924.19 0.40 284 0.017 1.39 0.56 9/24--9/27 924.21 924.12 0.09 79 0.014 1.39 0.13 9/28--9/30 924.11 924.05 0.06 48 0.016 1.39 0.09 10/1--10/8 924.05 923.89 0.16 159 0.012 1.39 0.22 10/8--10/11 923.89 923.81 0.08 87 0.011 1.39 0.11 10/12--10/14 924.61 924.53 0.08 36 0.027 1.39 0.11 10/17--10/19 924.44 924.37 0.07 51 0.016 1.39 0.09 SUM =10.3 * Evaporation and Infiltration rates were selected from periods on no rain. Range of Evaporation and Infiltration Rates (in/hr)0.011 0.094 Average Evaporation and Infiltration Rate (in/hr)0.033 Infiltration and Evaporation Rates for: Monitoring Location # 3 (Trailer Park #1589) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Period of no Rainfall Beginning Elevation (ft) Ending Elevation (ft) Change in Elevation (ft) Duration of Period (hr) Evaporation & Infiltration Rate* (in/hr) Pond Area (ac) Overall Volume Reduction within Period (ac-ft) 6/3--6/6 924.66 923.91 0.75 88 0.102 0.87 0.65 6/7--6/9 925.08 924.34 0.74 56 0.158 0.87 0.64 6/10--6/12 924.81 923.93 0.88 63 0.167 0.87 0.76 6/12--6/18 923.87 923.31 0.56 139 0.048 0.87 0.49 6/19--6/21 925.49 924.34 1.15 55 0.251 0.87 1.00 6/22--6/24 924.76 924.18 0.58 54 0.128 0.87 0.50 6/24--6/28 924.69 923.93 0.76 104 0.088 0.87 0.66 6/30--7/5 927.23 924.20 3.03 133 0.273 0.87 2.63 7/6--7/11 925.00 924.03 0.98 110 0.106 0.87 0.85 7/11--7/14 924.27 923.90 0.37 74 0.061 0.87 0.33 7/14--7/18 923.97 923.71 0.25 79 0.038 0.87 0.22 7/18--7/21 925.69 924.57 1.12 70 0.191 0.87 0.97 7/21--7/25 925.20 924.31 0.90 97 0.111 0.87 0.78 7/26--7/28 925.45 924.91 0.54 39 0.167 0.87 0.47 7/28--8/1 924.91 924.16 0.75 105 0.086 0.87 0.65 8/1--8/9 924.46 923.81 0.65 190 0.041 0.87 0.57 8/10--8/12 925.70 924.84 0.86 50 0.207 0.87 0.75 8/12--8/14 925.30 924.80 0.49 45 0.132 0.87 0.43 8/15--8/17 924.97 924.56 0.41 48 0.103 0.87 0.36 8/17--8/21 924.68 924.18 0.50 111 0.054 0.87 0.44 8/22--8/28 924.66 924.05 0.61 141 0.052 0.87 0.53 8/28--8/31 925.72 924.82 0.90 59 0.183 0.87 0.78 8/31--9/5 925.38 924.34 1.04 131 0.096 0.87 0.91 9/6--9/7 924.59 924.43 0.15 29 0.063 0.87 0.13 9/8--9/9 924.86 924.69 0.17 31 0.065 0.87 0.15 9/9--9/11 924.66 924.41 0.25 46 0.065 0.87 0.22 9/12--9/24 924.48 923.55 0.93 283 0.040 0.87 0.81 9/24--9/28 923.66 923.48 0.18 90 0.024 0.87 0.16 9/30--10/9 923.45 923.17 0.28 196 0.017 0.87 0.24 10/12--10/14 925.83 924.88 0.95 42 0.273 0.87 0.83 10/17--10/19 924.52 924.24 0.27 52 0.063 0.87 0.24 SUM = 19.16 * Evaporation and Infiltration rates were selected from periods of no rain. Range of Evaporation and Infiltration Rates (in/hr)0.017 0.273 Average Evaporation and Infiltration Rate (in/hr)0.111 Infiltration and Evaporation Rates for: Monitoring Location # 4 (Unnamed #1687) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Period of no Rainfall Beginning Elevation (ft) Ending Elevation (ft) Change in Elevation (ft) Duration of Period (hr) Evaporation & Infiltration Rate* (in/hr) Pond Area (ac) Overall Volume Reduction within Period (ac-ft) 6/3--6/5 929.74 929.58 0.16 29 0.065 0.55 0.09 6/5--6/6 929.58 929.43 0.15 33 0.054 0.55 0.08 6/7--6/9 929.73 929.42 0.32 53 0.072 0.55 0.17 6/9--6/18 929.63 929.33 0.30 212 0.017 0.55 0.16 6/19--6/21 929.74 929.41 0.33 55 0.072 0.55 0.18 6/21--6/28 929.63 929.43 0.20 162 0.015 0.55 0.11 7/3--7/3 929.68 929.66 0.01 7 0.021 0.55 0.01 7/4--7/6 929.72 929.46 0.25 46 0.066 0.55 0.14 7/7--7/11 929.74 929.54 0.20 92 0.026 0.55 0.11 8/15--8/17 929.65 929.11 0.54 48 0.136 0.55 0.30 8/17--8/21 929.18 928.96 0.22 106 0.025 0.55 0.12 8/22--8/24 929.43 928.83 0.60 52 0.138 0.55 0.33 9/6--9/7 929.03 928.92 0.11 28 0.045 0.55 0.06 9/12--9/24 928.78 927.88 0.90 282 0.038 0.55 0.50 9/24--9/30 927.87 927.52 0.35 151 0.028 0.55 0.19 10/1--10/9 927.52 926.62 0.90 191 0.057 0.55 0.50 10/12--10/14 928.70 928.48 0.22 42 0.063 0.55 0.12 10/14--10/17 928.44 928.26 0.18 56 0.039 0.55 0.10 10/17--10/19 928.28 928.14 0.14 51 0.033 0.55 0.08 SUM = 3.36 * Evaporation and Infiltration rates were selected from periods on no rain. Range of Evaporation and Infiltration Rates (in/hr)0.015 0.138 Average Evaporation and Infiltration Rate (in/hr)0.053 Infiltration and Evaporation Rates for: Monitoring Location # 5 (Regional #1716) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Period of no Rainfall Beginning Elevation (ft) Ending Elevation (ft) Change in Elevation (ft) Duration of Period (hr) Evaporation & Infiltration Rate* (in/hr) Pond Area (ac) Overall Volume Reduction within Period (ac-ft) 6/7--6/9 916.86 916.44 0.42 60 0.084 0.55 0.23 6/18--6/21 917.27 916.34 0.92 63 0.176 0.55 0.51 6/21--6/24 916.64 916.29 0.34 58 0.071 0.55 0.19 6/29--7/5 917.61 916.71 0.90 141 0.076 0.55 0.50 7/6--7/9 916.95 916.62 0.33 66 0.059 0.55 0.18 7/18--7/21 917.10 916.41 0.69 69 0.119 0.55 0.38 7/21--7/25 916.79 916.41 0.38 95 0.048 0.55 0.21 7/26--7/28 916.90 916.48 0.42 39 0.131 0.55 0.24 8/10--8/12 917.03 916.39 0.64 51 0.151 0.55 0.35 8/28--8/31 916.90 916.33 0.57 65 0.106 0.55 0.32 8/31--9/5 916.63 916.22 0.41 132 0.038 0.55 0.23 9/8--9/9 916.49 916.37 0.12 33 0.044 0.55 0.07 10/1--10/11 915.57 915.29 0.28 249 0.013 0.55 0.15 10/12--10/14 916.80 916.30 0.50 43 0.140 0.55 0.28 10/17--10/19 916.19 916.09 0.10 51 0.023 0.55 0.05 SUM =3.88 * Evaporation and Infiltration rates were selected from periods on no rain. Range of Evaporation and Infiltration Rates (in/hr)0.013 0.176 Average Evaporation and Infiltration Rate (in/hr)0.085 Infiltration and Evaporation Rates for: Monitoring Location # 6 (Erickson #579) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Period of no Rainfall Beginning Elevation (ft) Ending Elevation (ft) Change in Elevation (ft) Duration of Period (hr) Evaporation & Infiltration Rate* (in/hr) Pond Area (ac) Overall Volume Reduction within Period (ac-ft) 9/16--9/24 919.09 919.01 0.08 187 0.005 2.26 0.18 9/26--9/26 919.10 919.09 0.01 5 0.022 2.26 0.02 9/26--9/30 919.09 919.02 0.07 92 0.009 2.26 0.15 10/2--10/11 919.09 918.96 0.12 232 0.006 2.26 0.28 SUM = 0.63 * Evaporation and Infiltration rates were calculated during periods of no rain and when the splash pad was not in operation. Range of Evaporation and Infiltration Rates (in/hr)0.005 0.022 Average Evaporation and Infiltration Rate (in/hr)0.01047 Infiltration and Evaporation Rates for: Monitoring Location # 7 (Bloomfield #1864) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Period of no Rainfall Beginning Elevation (ft) Ending Elevation (ft) Change in Elevation (ft) Duration of Period (hr) Evaporation & Infiltration Rate* (in/hr) Pond Area (ac) Overall Volume Reduction within Period (ac-ft) 6/7--6/9 908.93 908.56 0.37 60 0.075 0.79 0.30 6/10--6/18 908.73 908.27 0.46 207 0.027 0.79 0.36 6/19--6/21 908.99 908.64 0.35 55 0.077 0.79 0.28 6/21--6/24 908.87 908.66 0.22 57 0.045 0.79 0.17 6/24--6/28 908.66 908.46 0.20 104 0.023 0.79 0.16 6/30--7/6 909.00 908.64 0.36 147 0.029 0.79 0.28 7/6--7/9 908.68 908.59 0.09 65 0.016 0.79 0.07 7/9--7/11 908.60 908.55 0.04 43 0.012 0.79 0.03 7/14--7/18 908.54 908.47 0.08 80 0.012 0.79 0.06 7/18--7/21 909.00 908.73 0.27 67 0.049 0.79 0.22 7/21--7/25 909.00 908.72 0.28 90 0.037 0.79 0.22 7/27--7/28 909.00 908.85 0.14 26 0.066 0.79 0.11 7/28--8/1 908.86 908.63 0.23 107 0.026 0.79 0.18 8/1--8/8 908.74 908.57 0.17 164 0.012 0.79 0.13 8/11--8/12 909.00 908.88 0.12 25 0.058 0.79 0.10 8/12--8/14 908.99 908.82 0.17 47 0.045 0.79 0.14 8/15--8/17 908.94 908.77 0.17 47 0.043 0.79 0.13 8/17--8/21 908.80 908.63 0.17 110 0.018 0.79 0.13 8/22--8/28 908.78 908.59 0.18 143 0.015 0.79 0.15 8/29--8/31 909.00 908.83 0.17 46 0.044 0.79 0.13 9/1--9/5 909.00 908.72 0.28 117 0.028 0.79 0.22 9/6--9/7 908.80 908.76 0.04 28 0.018 0.79 0.03 9/8--9/9 908.89 908.85 0.05 33 0.017 0.79 0.04 9/12--9/24 908.79 908.52 0.27 282 0.011 0.79 0.21 9/24--9/27 908.55 908.50 0.05 76 0.008 0.79 0.04 9/28--9/30 908.49 908.47 0.03 47 0.007 0.79 0.02 10/1--10/11 908.49 908.36 0.13 249 0.006 0.79 0.11 10/14--10/16 908.89 908.82 0.07 43 0.021 0.79 0.06 10/17--10/19 908.81 908.75 0.06 51 0.015 0.79 0.05 * Evaporation and Infiltration rates were selected from periods on no rain.SUM = 4.13 Average Evaporation and Infiltration Rate (in/hr)0.030 Range of Evaporation and Infiltration Rates (in/hr)0.006 0.077 Infiltration and Evaporation Rates for: Monitoring Location # 8 (O'Leary's #600) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Period of no Rainfall Beginning Elevation (ft) Ending Elevation (ft) Change in Elevation (ft) Duration of Period (hr) Evaporation & Infiltration Rate* (in/hr) Pond Area (ac) Overall Volume Reduction within Period (ac-ft) 7/16--7/18 929.70 929.68 0.02 27 0.009 5.56 0.12 sum = 0.12 * Evaporation and Infiltration rates were selected from periods of no rain. Range of Evaporation and Infiltration Rates 0.009 0.009 Average Evaporation and Infiltration Rate (in/hr) 0.009 Infiltration and Evaporation Rates for: Monitoring Location # 9 (Wachter #2443) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Period of no Rainfall Beginning Elevation (ft) Ending Elevation (ft) Change in Elevation (ft) Duration of Period (hr) Evaporation & Infiltration Rate* (in/hr) Pond Area (ac) Overall Volume Reduction within Period (ac-ft) 6/5--6/6 914.88 914.65 0.24 33 0.086 5.1 1.21 6/7--6/9 915.43 914.98 0.45 54 0.099 5.1 2.27 6/10--6/18 915.22 914.10 1.12 205 0.066 5.1 5.73 6/19--6/21 916.23 915.35 0.88 54 0.196 5.1 4.49 6/21--6/24 915.69 915.17 0.51 57 0.108 5.1 2.61 6/24--6/28 915.16 914.64 0.53 104 0.061 5.1 2.68 6/29--7/6 919.25 915.00 4.25 164 0.311 5.1 21.66 7/6--7/9 914.99 914.68 0.31 66 0.057 5.1 1.59 7/9--7/11 914.67 914.51 0.17 39 0.051 5.1 0.85 7/12--7/14 914.44 914.27 0.17 44 0.046 5.1 0.86 7/14--7/18 914.28 914.01 0.27 80 0.041 5.1 1.39 7/19--7/21 914.90 914.67 0.23 52 0.053 5.1 1.17 7/21--7/25 915.19 914.83 0.36 94 0.046 5.1 1.83 7/26--7/28 915.69 915.47 0.22 34 0.077 5.1 1.12 7/28--8/1 915.46 914.91 0.54 106 0.062 5.1 2.77 8/1--8/8 915.04 914.55 0.49 160 0.037 5.1 2.52 8/10--8/12 916.05 915.74 0.30 45 0.081 5.1 1.54 8/12--8/14 915.98 915.62 0.36 45 0.095 5.1 1.83 8/15--8/17 915.78 915.52 0.26 46 0.068 5.1 1.33 8/17--8/21 915.60 915.12 0.48 110 0.052 5.1 2.42 8/22--8/28 915.31 914.90 0.41 141 0.035 5.1 2.10 8/28--8/30 915.62 915.41 0.21 60 0.041 5.1 1.06 8/31--9/5 915.86 915.26 0.59 128 0.055 5.1 3.02 9/6--9/7 915.40 915.29 0.11 31 0.043 5.1 0.56 9/9--9/11 915.41 915.26 0.15 43 0.042 5.1 0.77 9/12--9/24 915.29 914.48 0.80 282 0.034 5.1 4.10 9/24--9/27 914.48 914.32 0.16 79 0.025 5.1 0.83 9/28--9/30 914.28 914.17 0.11 47 0.029 5.1 0.58 10/1--10/11 914.16 913.64 0.52 245 0.026 5.1 2.67 10/12--10/14 915.43 915.33 0.10 41 0.030 5.1 0.53 10/14--10/17 915.30 915.02 0.28 57 0.059 5.1 1.42 10/17--10/19 915.05 914.86 0.18 51 0.044 5.1 0.94 SUM = 80.44 * Evaporation and Infiltration rates were selected from periods of no rain. Range of Evaporation and Infiltration Rates (in/hr)0.025 0.311 Average Evaporation and Infiltration Rate (in/hr)0.067 Infiltration and Evaporation Rates for: Monitoring Location # 10 (Shannon #614) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Period of no Rainfall Beginning Elevation (ft) Ending Elevation (ft) Change in Elevation (ft) Duration of Period (hr) Evaporation & Infiltration Rate* (in/hr) Pond Area (ac) Overall Volume Reduction within Period (ac-ft) 6/5--6/6 919.83 919.51 0.33 33 0.119 3.17 1.03 6/7--6/9 919.83 919.57 0.26 53 0.059 3.17 0.82 6/10--6/18 919.69 918.71 0.98 207 0.057 3.17 3.12 6/19--6/21 919.98 919.91 0.08 39 0.024 3.17 0.24 6/21--6/24 920.20 919.83 0.38 55 0.082 3.17 1.19 6/30--7/6 921.59 920.45 1.14 148 0.093 3.17 3.62 7/9--7/11 920.75 920.70 0.05 35 0.015 3.17 0.14 7/12--7/14 920.62 920.38 0.24 45 0.063 3.17 0.74 7/14--7/18 920.35 920.01 0.34 81 0.051 3.17 1.08 7/18--7/21 920.32 920.22 0.10 69 0.017 3.17 0.32 7/22--7/25 920.41 920.21 0.20 72 0.033 3.17 0.62 8/1--8/8 920.89 920.32 0.57 162 0.042 3.17 1.82 8/15--8/17 920.99 920.85 0.14 48 0.036 3.17 0.45 8/17--8/21 920.94 920.63 0.31 110 0.033 3.17 0.97 8/24--8/28 920.58 920.31 0.27 88 0.037 3.17 0.85 8/28--8/31 920.52 920.35 0.18 54 0.040 3.17 0.57 9/6--9/7 920.42 920.14 0.28 25 0.135 3.17 0.89 9/8--9/9 920.31 920.17 0.15 15 0.117 3.17 0.46 9/9--9/11 920.32 920.19 0.13 44 0.036 3.17 0.42 9/12--9/23 920.22 919.70 0.52 267 0.023 3.17 1.65 9/28--9/30 919.54 919.38 0.16 46 0.041 3.17 0.49 10/1--10/6 919.37 919.15 0.21 129 0.020 3.17 0.68 10/14--10/16 920.41 920.28 0.13 40 0.041 3.17 0.43 SUM=22.62 * Evaporation and Infiltration rates were selected from periods on no rain. Range of Evaporation and Infiltration Rates (in/hr)0.015 0.135 Average Evaporation and Infiltration Rate (in/hr)0.053 Infiltration and Evaporation Rates for: Monitoring Location # 11 (#1710) 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Period of no Rainfall Beginning Elevation (ft) Ending Elevation (ft) Change in Elevation (ft) Duration of Period (hr) Evaporation & Infiltration Rate* (in/hr) Pond Area (ac) Overall Volume Reduction within Period (ac-ft) 6/5--6/6 915.98 915.82 0.16 33 0.057 0.58 0.09 6/7--6/9 916.67 916.02 0.65 56 0.139 0.58 0.38 6/10--6/13 916.43 915.97 0.47 77 0.073 0.58 0.27 6/19--6/20 916.92 916.32 0.60 30 0.238 0.58 0.35 6/21--6/24 916.99 916.23 0.76 58 0.158 0.58 0.44 6/24--6/28 916.19 915.77 0.41 104 0.047 0.58 0.24 6/30--7/5 916.96 916.00 0.95 132 0.087 0.58 0.55 7/9--7/11 916.28 916.11 0.17 44 0.047 0.58 0.10 7/12--7/14 916.36 916.18 0.18 47 0.045 0.58 0.10 7/14--7/16 916.21 916.13 0.08 53 0.017 0.58 0.04 7/18--7/21 916.82 916.31 0.51 66 0.092 0.58 0.29 7/22--7/25 917.06 916.35 0.71 82 0.103 0.58 0.41 7/28--8/1 916.66 916.24 0.42 102 0.050 0.58 0.24 8/1--8/8 916.45 916.08 0.37 162 0.027 0.58 0.22 8/10--8/12 916.82 916.39 0.43 41 0.127 0.58 0.25 8/12--8/14 916.70 916.44 0.26 45 0.070 0.58 0.15 8/15--8/17 916.91 916.41 0.50 45 0.133 0.58 0.29 8/17--8/21 916.44 916.17 0.27 109 0.029 0.58 0.15 8/22--8/24 916.47 916.35 0.12 48 0.030 0.58 0.07 8/24--8/27 916.34 916.21 0.13 81 0.019 0.58 0.07 8/29--8/31 917.06 916.44 0.62 49 0.152 0.58 0.36 9/1--9/5 916.98 916.19 0.79 113 0.084 0.58 0.46 9/6--9/7 916.50 916.38 0.12 27 0.054 0.58 0.07 9/10--9/11 916.42 916.31 0.12 33 0.042 0.58 0.07 9/12--9/24 916.43 915.81 0.62 283 0.026 0.58 0.36 9/24--9/30 915.92 915.73 0.19 150 0.016 0.58 0.11 10/1--10/11 915.77 915.45 0.31 249 0.015 0.58 0.18 10/12--10/14 917.47 916.29 1.17 43 0.328 0.58 0.68 SUM = 7.00 * Evaporation and Infiltration rates were selected from periods on no rain. Range of Evaporation and Infiltration Rates (in/hr)0.015 0.328 Average Evaporation and Infiltration Rate (in/hr)0.082 Appendix ROSEMOUNT WATER QUALITY MONITORING PROGRAM – (2019) Attachment C – Water Quality Data C.1 Long-Term Water Quality Tables C.2 Long-Term Water Quality Box and Whisker Charts C.3 Chloride Charts WSB Project No. 016347-000 Sampling Date1 Total Phosphorus (mg/L) Ortho Phosphorus (mg/L) Total Suspended Solids (mg/L) Chloride (mg/L) 6/10/2014 0.19 0.080 6 7/16/2014 0.28 0.020 9 8/11/2014 0.09 0.040 6 9/17/2014 0.17 0.020 7 10/28/2014 0.18 0.010 16 5/20/2015 0.20 0.130 3.0 7/14/2015 0.13 0.070 4.0 8/6/2015 0.13 0.020 6.0 8/25/2015 0.16 0.080 7.0 9/22/2015 0.15 0.100 6.0 10/29/2015 0.15 0.044 5.00 2/16/2016 0.12 0.070 2 19.5 3/16/2016 0.07 0.010 3 15.8 4/28/2016 0.08 0.070 2 34.7 5/26/2016 0.10 0.080 2 33.5 6/23/2016 0.30 0.190 27 20.7 7/16/2016 0.09 0.020 3 18.1 8/31/2016 0.11 0.020 3 11.1 9/27/2016 0.15 0.090 1 8.15 10/25/2016 0.20 0.100 1 8.4 4/28/2017 0.13 0.080 2 91.8 5/25/2017 0.08 0.010 1 56 6/21/2017 0.11 0.059 6 61.5 7/31/2017 0.22 0.020 24 20.4 8/30/2017 0.12 0.046 36 14.9 9/27/2017 0.10 0.026 4 15.9 10/31/2017 0.11 0.023 3 14.9 2/14/2018 1.03 0.329 41 66.1 3/14/2018 0.80 0.603 30 106 5/30/2018 0.19 0.020 15 62.3 6/27/2018 0.12 0.046 11 60 7/25/2018 0.06 0.020 6 49.6 8/29/2018 0.06 0.000 3 39.2 9/27/2018 0.01 0.039 4 25.3 10/29/2018 0.10 0.033 5 24 1/7/2019 0.16 0.072 7 37.1 3/11/2019 0.38 0.339 13 95.3 6/25/2019 0.09 0.029 4 61 7/17/2019 0.13 0.010 16 37.4 8/12/2019 0.12 0.029 8 33.3 9/17/2019 0.14 0.052 7 27.4 10/8/2019 0.07 0.075 1 24.1 2/12/2020 0.18 0.091 9 39.2 3/11/2020 0.18 0.072 27 277.0 7/7/2020 0.13 0.010 12 24.3 8/3/2020 0.06 0.000 5 21.9 9/9/2020 0.08 0.013 6 21.9 11/2/2020 0.10 0.000 10 23.9 2020 Average 0.12 0.03 11.50 68.03 AVERAGE 0.17 0.07 9.06 43.29 MEDIAN 0.13 0.04 6.00 27.40 MAX 1.03 0.60 41.00 277.00 MIN 0.01 0.00 1.00 8.15 STDEV 0.17 0.10 9.37 46.49 75TH PERCENTILE 0.18 0.08 10.75 58.00 25TH PERCENTILE 0.10 0.02 3.00 19.95 1 - Water quality analysis was performed by William Lloyd / Tri-City Laboratory Indicates sample result below lab detection limits, 1/2 MDL value reported Location 1 Water Quality Sampling Results City of Rosemount, MN 2020 Water Quality and Quantity Monitoring Study Water Quality Sampling Results WSB Project No. 016347-000 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN Sampling Date1 Total Phosphorus (mg/L) Ortho Phosphorus (mg/L) Total Suspended Solids (mg/L) Chloride (mg/L) 6/10/2014 0.18 0.0900 0 7/16/2014 0.40 0.0100 11 8/11/2014 0.04 0.0500 100 9/17/2014 0.23 0.0300 10 10/28/2014 0.07 0.0100 4 5/20/2015 0.06 0.0300 16.0 7/14/2015 0.13 0.0700 11.0 8/6/2015 0.07 0.0600 2.0 8/25/2015 0.14 0.0600 13.0 9/22/2015 0.24 0.0300 17.0 10/29/2015 0.05 0.0050 5.0 4/28/2016 0.10 0.0300 6 29.0 5/26/2016 0.18 0.0400 12 38.2 6/23/2016 0.24 0.0100 30 16.0 7/16/2016 0.17 0.0200 17 11.4 8/31/2016 0.19 0.0100 17 5.6 9/27/2016 0.16 0.0400 8 13.1 10/24/2016 0.10 0.0100 6 10.2 4/28/2017 0.13 0.0800 8 91.8 5/25/2017 0.02 0.0293 8 52.0 6/21/2017 0.22 0.0000 15 48.6 7/31/2017 0.15 0.0033 13 10.8 8/30/2017 0.01 0.0000 13 6.8 9/27/2017 0.09 0.0261 17 20.1 10/31/2017 0.13 0.0098 13 15.0 5/30/2018 0.13 0.0000 6 73.3 6/27/2018 0.09 0.0033 2 36.2 7/25/2018 0.04 0.0098 6 28.3 8/29/2018 0.08 0.0228 8 13.6 9/27/2018 0.04 0.0130 5 17.3 10/29/2018 0.09 0.0130 9 13.2 6/25/2019 0.05 0.0098 4 48.0 7/17/2019 0.09 0.0000 12 18.4 8/12/2019 0.13 0.0065 11 15.9 9/17/2019 0.09 0.0326 13 18.0 10/8/2019 0.07 0.0358 9 22.6 7/6/2020 0.00 0.0000 5 16.2 8/3/2020 0.05 0.0000 6 10.7 9/9/2020 0.11 0.0163 11 9.3 11/2/2020 0.10 0.0000 10 8.1 2020 Average 0.06 0.0041 8.00 11.07 AVERAGE 0.12 0.0229 12.23 24.75 MEDIAN 0.10 0.0130 10.00 16.20 MAX 0.40 0.0900 100.00 91.80 MIN 0.00 0.0000 0.00 5.62 STDEV 0.08 0.0233 15.27 20.63 75TH PERCENTILE 0.16 0.0320 13.00 32.60 25TH PERCENTILE 0.06 0.0054 6.00 11.10 1 - Water quality analysis was performed by William Lloyd / Tri-City Laboratory Location 2 Indicates sample result below lab detection limits, 1/2 MDL value reported Water Quality Sampling Results WSB Project No. 016347-000 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN Sampling Date1 Total Phosphorus (mg/L) Ortho Phosphorus (mg/L) Total Suspended Solids (mg/L) Chloride (mg/L) 6/10/2014 0.10 0.100 1 7/16/2014 0.18 0.050 2 8/11/2014 0.33 0.110 14 9/17/2014 0.21 0.030 10 10/28/2014 0.15 0.010 1 5/20/2015 0.20 0.090 6.0 7/14/2015 0.20 0.160 2.0 8/6/2015 0.35 0.100 30.0 8/25/2015 0.15 0.110 7.0 9/22/2015 0.24 0.090 13.0 10/29/2015 0.26 0.160 10.0 4/28/2016 0.19 0.050 13 53.9 5/26/2016 0.47 0.050 26 19.3 6/23/2016 0.41 0.170 3 6.5 7/16/2016 0.19 0.100 6 4.1 8/31/2016 0.14 0.100 10 6.9 9/27/2016 0.25 0.010 8 9.3 10/24/2016 0.36 0.030 14 7.2 4/28/2017 0.06 0.020 8 109.6 5/25/2017 0.05 0.003 3 13.2 6/21/2017 0.22 0.036 9 16.0 7/31/2017 0.13 0.016 8 7.4 8/30/2017 0.07 0.000 4 7.7 9/27/2017 0.14 0.020 1 8.0 10/30/2017 0.24 0.055 6 21.5 5/30/2018 0.39 0.052 55 32.0 6/27/2018 0.13 0.078 2 14.8 7/25/2018 0.03 0.020 5 13.6 8/29/2018 0.14 0.068 17 6.6 9/27/2018 0.98 0.065 3 14.0 10/29/2018 0.21 0.065 10 15.0 6/25/2019 0.19 0.104 3 24.0 7/17/2019 0.09 0.085 3 4.6 8/12/2019 0.18 0.055 7 12.7 9/17/2019 0.09 0.085 2 4.1 10/8/2019 0.09 0.081 1 11.4 7/6/2020 0.06 0.016 4 11.1 8/3/2020 0.08 0.000 4 6.8 9/9/2020 0.16 0.052 9 8.8 11/2/2020 0.32 0.215 7 27.1 2020 Average 0.15 0.071 6.00 13.44 AVERAGE 0.21 0.068 8.66 17.14 MEDIAN 0.18 0.060 6.50 11.40 MAX 0.98 0.215 55.00 109.60 MIN 0.03 0.000 0.50 4.06 STDEV 0.16 0.050 9.82 20.58 75TH PERCENTILE 0.25 0.100 10.00 17.65 25TH PERCENTILE 0.11 0.023 3.00 7.01 1 - Water quality analysis was performed by William Lloyd / Tri-City Laboratory Location 3 Indicates sample result below lab detection limits, 1/2 MDL value reported Water Quality Sampling Results WSB Project No. 016347-000 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN Sampling Date1 Total Phosphorus (mg/L) Ortho Phosphorus (mg/L) Total Suspended Solids (mg/L) Chloride (mg/L) 6/10/2014 0.10 0.020 8 7/16/2014 0.07 0.000 8 8/11/2014 0.15 0.010 22 9/19/2014 0.16 0.000 16 10/28/2014 0.07 0.000 13 5/20/2015 0.07 0.020 15.0 7/14/2015 0.08 0.020 9.0 8/6/2015 0.13 0.040 18.0 8/25/2015 0.13 0.060 10.0 9/22/2015 0.11 0.010 17.0 10/29/2015 0.07 0.005 14.0 4/28/2016 0.07 0.010 10 59.6 5/26/2016 0.12 0.010 15 40.5 6/23/2016 0.08 0.010 2 37.4 7/16/2016 0.06 0.010 13 18.4 8/31/2016 0.02 0.010 15 16.0 9/27/2016 0.15 0.150 3 33.3 10/24/2016 0.07 0.010 3 33.6 4/28/2017 0.02 0.020 4 78.4 5/25/2017 0.06 0.000 3 59.2 6/21/2017 0.08 0.003 3 43.4 7/31/2017 0.08 0.007 6 38.1 8/30/2017 0.08 0.000 4 36.4 9/27/2017 0.04 0.013 5 85.5 10/31/2017 0.05 0.020 2 37.3 5/30/2018 0.11 0.000 129 64.9 6/27/2018 0.19 0.003 5 45.7 7/25/2018 0.07 0.020 17 35.8 8/29/2018 0.07 0.013 11 18.7 9/27/2018 0.07 0.016 11 19.8 10/29/2018 0.07 0.003 10 22.1 6/25/2019 0.02 0.003 3 49.0 7/17/2019 0.03 0.016 4 31.7 8/12/2019 0.05 0.020 5 38.7 9/17/2019 0.05 0.016 4 31.9 10/8/2019 0.01 0.010 3 28.0 7/6/2020 0.00 0.000 4 40.2 8/3/2020 0.00 0.000 5 40.1 9/9/2020 0.07 0.000 7 22.1 11/2/2020 0.07 0.000 4 30.7 2020 Average 0.03 0.000 5.00 33.28 AVERAGE 0.07 0.014 11.50 39.19 MEDIAN 0.07 0.010 7.50 37.30 MAX 0.19 0.150 129.00 85.50 MIN 0.00 0.000 2.00 16.04 STDEV 0.04 0.025 19.80 16.97 75TH PERCENTILE 0.10 0.019 13.75 44.55 25TH PERCENTILE 0.05 0.001 4.00 29.35 1 - Water quality analysis was performed by William Lloyd / Tri-City Laboratory Location 4 Indicates sample result below lab detection limits, 1/2 MDL value reported Water Quality Sampling Results WSB Project No. 016347-000 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN Sampling Date1 Total Phosphorus (mg/L) Ortho Phosphorus (mg/L) Total Suspended Solids (mg/L) Chloride (mg/L) 6/10/2014 0.10 0.020 10 7/16/2014 0.16 0.000 11 8/11/2014 0.08 0.010 19 9/17/2014 0.20 0.000 24 10/28/2014 0.14 0.040 15 5/20/2015 0.26 0.070 27.0 7/14/2015 0.23 0.050 12.0 8/6/2015 0.14 0.030 16.0 8/25/2015 0.20 0.070 19.0 9/22/2015 0.14 0.010 18.0 10/29/2015 0.12 0.005 12.0 2/16/2016 0.08 0.010 15 48.4 3/16/2016 0.07 0.010 9 64.6 4/28/2016 0.07 0.010 10 45.2 5/26/2016 0.07 0.010 20 33.6 6/23/2016 0.13 0.010 6 20.6 7/16/2016 0.14 0.010 18 10.7 8/31/2016 0.20 0.010 19 5.5 9/27/2016 0.15 0.040 6 2.5 10/24/2016 0.07 0.010 4 38.0 4/28/2017 0.02 0.020 8 98.4 5/25/2017 0.07 0.000 2 40.4 6/21/2017 0.07 0.020 2 41.8 7/31/2017 0.05 0.010 2 34.8 8/30/2017 0.05 0.000 1 27.9 9/27/2017 0.08 0.075 4 27.3 10/30/2017 0.07 0.023 2 26.4 2/14/2018 0.73 0.401 29 109 3/14/2018 0.71 0.570 10 176 5/30/2018 0.13 0.000 7 98.6 6/27/2018 0.13 0.020 1 55.8 7/25/2018 0.07 0.020 11 44.3 8/29/2018 0.02 0.013 12 28.4 9/27/2018 0.07 0.013 5 25.1 10/29/2018 0.07 0.010 7 33.5 1/7/2019 0.07 0.033 3 49.3 3/11/2019 0.32 0.283 17 336 6/25/2019 0.03 0.016 2 48 7/17/2019 0.04 0.020 4 27.6 8/12/2019 0.09 0.020 12 31.6 9/17/2019 0.07 0.016 3 23.6 10/8/2019 0.02 0.007 2 25.8 2/12/2020 0.12 0.013 6 131 3/11/2020 0.32 0.241 5 52 7/6/2020 0.00 0.000 3 59 8/3/2020 0.03 0.000 8 26.9 9/9/2020 0.19 0.020 14 18 11/2/2020 0.13 0.000 11 16.1 2020 Average 0.13 0.046 7.83 50.50 AVERAGE 0.14 0.048 10.06 53.56 MEDIAN 0.09 0.013 9.50 34.80 MAX 0.73 0.570 29.00 336.00 MIN 0.00 0.000 1.00 2.47 STDEV 0.14 0.108 7.16 59.52 75TH PERCENTILE 0.15 0.028 15.00 53.90 25TH PERCENTILE 0.07 0.010 4.00 26.10 1 - Water quality analysis was performed by William Lloyd / Tri-City Laboratory Location 5 Indicates sample result below lab detection limits, 1/2 MDL value reported Water Quality Sampling Results WSB Project No. 016347-000 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN Sampling Date1 Total Phosphorus (mg/L) Ortho Phosphorus (mg/L) Total Suspended Solids (mg/L) Chloride (mg/L) 6/10/2014 0.12 0.020 8 7.2 7/16/2014 0.10 0.000 11 8/11/2014 0.29 0.180 19 20.0 9/17/2014 0.26 0.070 12 10/28/2014 0.11 0.070 15 9.3 5/20/2015 0.24 0.170 4 7/14/2015 0.21 0.150 5 8/6/2015 0.41 0.270 13 8/25/2015 0.23 0.190 7 9/22/2015 0.33 0.210 5 10/29/2015 0.23 0.091 12 2/16/2016 0.34 0.170 23 1080.0 3/16/2016 0.06 0.030 13 216.4 4/28/2016 0.23 0.010 14 150.8 5/26/2016 0.23 0.090 13 205.2 6/23/2016 0.19 0.080 1 13.6 7/16/2016 0.23 0.160 7 13.5 8/31/2016 0.17 0.050 8 16.8 9/27/2016 0.08 0.030 6 2.5 10/24/2016 0.01 0.040 9 3.4 4/28/2017 0.07 0.030 16 89.4 5/25/2017 0.10 0.042 20 28.9 6/21/2017 0.17 0.055 8 19.1 7/31/2017 0.19 0.117 7 11.4 8/30/2017 0.13 0.078 14 7.4 9/27/2017 0.50 0.277 17 11.8 10/31/2017 0.22 0.095 7 4.9 2/14/2018 0.95 0.603 25 618.0 3/14/2018 0.85 0.417 38 1830.0 5/30/2018 0.23 0.085 7 67.7 6/27/2018 0.30 0.195 15 37.1 7/25/2018 0.14 0.095 8 27.4 8/29/2018 0.16 0.124 5 9.1 9/27/2018 0.13 0.065 5 4.5 10/29/2018 0.44 0.055 30 4.8 1/7/2019 0.23 0.052 19 242.0 3/11/2019 0.30 0.241 209 2280.0 6/25/2019 0.15 0.085 4 24.0 7/17/2019 0.14 0.068 9 7.7 8/12/2019 0.45 0.290 16 16.0 9/17/2019 0.20 0.127 5 4.3 10/8/2019 0.15 0.081 12 3.9 2/12/2020 0.85 0.808 9 1580.0 3/11/2020 0.95 0.463 88 310.0 7/6/2020 0.06 0.078 3 59.8 8/3/2020 0.11 0.091 3 14.1 9/9/2020 0.31 0.166 17 9.9 11/2/2020 0.29 0.189 13 73.7 2020 Average 0.43 0.299 22.17 341.26 AVERAGE 0.27 0.149 17.38 228.39 MEDIAN 0.22 0.091 11.50 17.93 MAX 0.95 0.808 209.00 2280.00 MIN 0.01 0.000 1.00 2.47 STDEV 0.22 0.154 31.17 526.23 75TH PERCENTILE 0.30 0.187 16.00 135.45 25TH PERCENTILE 0.14 0.058 7.00 8.04 1 - Water quality analysis was performed by William Lloyd / Tri-City Laboratory Location 6 Indicates sample result below lab detection limits, 1/2 MDL value reported Water Quality Sampling Results WSB Project No. 016347-000 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN Sampling Date1 Total Phosphorus (mg/L) Ortho Phosphorus (mg/L) Total Suspended Solids (mg/L) Chloride (mg/L) 6/10/2014 0.45 0.310 2 7/16/2014 0.49 0.050 174 8/11/2014 0.26 0.020 51 9/17/2014 0.15 0.000 9 10/28/2014 0.56 0.010 260 5/20/2015 0.19 0.120 2.0 7/14/2015 1.03 0.070 397.0 8/6/2015 0.19 0.030 22.0 8/25/2015 0.17 0.050 312.0 9/22/2015 0.07 0.010 9.0 10/29/2015 0.07 0.005 13.0 4/28/2016 0.06 0.010 7 46.3 5/26/2016 0.10 0.010 10 37.0 6/23/2016 1.03 0.040 29 7.0 7/16/2016 0.11 0.010 5 3.9 8/31/2016 0.12 0.010 8 4.7 9/27/2016 0.18 0.020 6 4.4 10/24/2016 0.46 0.010 2 5.8 4/28/2017 0.10 0.030 15 99.8 5/25/2017 0.09 0.029 4 15.3 6/21/2017 0.59 0.078 34 15.7 7/31/2017 0.15 0.026 17 5.6 8/30/2017 0.13 0.013 60 5.5 9/27/2017 0.02 0.020 51 8.4 10/31/2017 0.04 0.003 3 8.2 2/14/2018 1.59 0.762 353 350.0 3/14/2018 1.28 0.612 94 198.0 5/30/2018 0.20 0.000 4 80.4 6/27/2018 0.23 0.062 14 26.4 7/25/2018 0.57 0.160 157 28.8 8/29/2018 0.38 0.189 34 18.2 9/27/2018 0.28 0.052 20 7.6 10/29/2018 0.26 0.521 9 10.7 1/7/2019 0.29 0.111 18 54.5 3/11/2019 0.59 0.515 112 745.0 6/25/2019 0.15 0.101 8 33.0 7/17/2019 0.08 0.055 10 2.5 8/12/2019 0.12 0.016 17 7.6 9/17/2019 0.17 0.016 19 4.2 10/8/2019 0.07 0.003 7 6.1 2/12/2020 0.74 0.596 27 383.0 3/11/2020 0.42 0.182 38 57.0 7/6/2020 0.08 0.046 16 38.9 8/3/2020 0.15 0.000 19 9.2 9/9/2020 0.18 0.010 15 9.8 11/2/2020 0.07 0.000 4 16.0 2020 Average 0.27 0.139 19.83 85.66 AVERAGE 0.32 0.109 54.28 67.27 MEDIAN 0.18 0.030 16.50 15.30 MAX 1.59 0.762 397.00 745.00 MIN 0.02 0.000 2.00 2.54 STDEV 0.34 0.187 95.04 147.25 75TH PERCENTILE 0.45 0.104 41.25 46.30 25TH PERCENTILE 0.10 0.010 7.75 6.13 1 - Water quality analysis was performed by William Lloyd / Tri-City Laboratory Location 7 Indicates sample result below lab detection limits, 1/2 MDL value reported Water Quality Sampling Results WSB Project No. 016347-000 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN Sampling Date1 Total Phosphorus (mg/L) Ortho Phosphorus (mg/L) Total Suspended Solids (mg/L) Chloride (mg/L) 6/10/2014 0.17 0.030 2 7/16/2014 0.27 0.020 45 8/11/2014 0.22 0.020 39 9/17/2014 0.23 0.000 46 10/28/2014 0.08 0.030 19 5/20/2015 0.10 0.020 14.0 7/14/2015 0.19 0.010 32.0 8/6/2015 0.25 0.030 44.0 8/25/2015 0.23 0.090 36.0 9/22/2015 0.17 0.010 24.0 10/29/2015 0.14 0.005 14.0 2/16/2016 0.03 0.010 10 292.0 3/16/2016 0.12 0.010 27 286.0 4/28/2016 0.09 0.010 15 193.6 5/26/2016 0.13 0.040 3 174.4 6/23/2016 0.23 0.050 6 73.6 7/16/2016 0.25 0.070 10 47.3 8/31/2016 0.03 0.010 5 19.5 9/27/2016 0.21 0.010 18 9.6 10/24/2016 0.08 0.010 7 8.3 4/28/2017 0.10 0.040 7 250.0 5/25/2017 0.05 0.010 9 122.0 6/21/2017 0.14 0.036 6 110.0 7/31/2017 0.19 0.078 9 28.9 8/30/2017 0.20 0.016 12 16.4 9/27/2017 0.15 0.020 16 18.3 10/31/2017 0.11 0.010 8 13.1 5/30/2018 0.20 0.036 2 351.0 6/27/2018 0.20 0.020 8 159.0 7/25/2018 0.61 0.007 98 82.4 8/29/2018 0.31 0.003 42 48.7 9/27/2018 0.13 0.000 17 20.7 10/29/2018 0.09 0.010 11 15.9 6/25/2019 0.22 0.010 29 75.0 7/17/2019 0.27 0.000 52 39.1 8/12/2019 0.28 0.010 58 37.3 9/17/2019 0.08 0.020 14 14.7 10/8/2019 0.08 0.016 16 13.3 7/6/2020 0.07 0.007 17 13.1 8/3/2020 0.22 0.003 50 34.3 9/9/2020 0.22 0.026 56 20.8 11/2/2020 0.14 0.013 15 32.9 2020 Average 0.16 0.012 34.50 25.28 AVERAGE 0.17 0.021 23.05 84.55 MEDIAN 0.17 0.012 15.50 37.30 MAX 0.61 0.090 98.00 351.00 MIN 0.03 0.000 2.00 8.26 STDEV 0.10 0.020 20.13 97.08 75TH PERCENTILE 0.22 0.030 36.75 122.00 25TH PERCENTILE 0.10 0.010 8.75 16.40 1 - Water quality analysis was performed by William Lloyd / Tri-City Laboratory Location 8 Indicates sample result below lab detection limits, 1/2 MDL value reported Water Quality Sampling Results WSB Project No. 016347-000 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN Sampling Date1 Total Phosphorus (mg/L) Ortho Phosphorus (mg/L) Total Suspended Solids (mg/L) Chloride (mg/L) 6/10/2014 0.19 0.050 2 7/16/2014 0.13 0.000 50 8/11/2014 0.19 0.030 14 9/17/2014 0.15 0.000 13 10/28/2014 0.27 0.020 19 5/20/2015 0.16 0.020 19.0 7/14/2015 0.10 0.010 17.0 8/6/2015 0.12 0.020 18.0 8/25/2015 0.15 0.040 16.0 9/22/2015 0.09 0.010 11.0 10/29/2015 0.19 0.026 18.0 2/16/2016 0.32 0.060 15 3440.0 3/16/2016 0.12 0.010 27 96.9 4/28/2016 0.28 0.010 22 152.8 5/26/2016 0.13 0.030 6 126.0 6/23/2016 0.14 0.010 18 58.4 7/16/2016 0.11 0.010 8 38.7 8/31/2016 0.03 0.010 5 19.5 9/27/2016 0.21 0.030 7 22.9 10/24/2016 0.28 0.100 16 19.5 4/28/2017 0.11 0.050 13 173.4 5/25/2017 0.05 0.013 5 108.0 6/21/2017 0.15 0.007 22 96.8 7/31/2017 0.06 0.010 7 51.0 8/30/2017 0.06 0.000 9 35.6 9/27/2017 0.05 0.016 5 41.9 10/31/2017 0.42 0.205 6 74.6 2/14/2018 0.59 0.329 16 361.0 3/14/2018 0.68 0.384 44 179.0 5/30/2018 0.22 0.026 10 155.0 6/27/2018 0.13 0.007 5 109.0 7/25/2018 0.19 0.020 89 92.0 8/29/2018 0.65 0.010 11 75.4 9/27/2018 0.09 0.003 9 73.6 10/29/2018 0.19 0.036 10 106.0 1/7/2019 0.15 0.095 4 63.8 3/11/2019 0.21 0.192 3 177.0 6/25/2019 0.08 0.007 6 90.0 7/17/2019 0.12 0.007 40 42.7 8/12/2019 0.07 0.007 15 44.9 9/17/2019 0.09 0.023 12 52.2 10/8/2019 0.07 0.010 10 52.7 2/12/2020 0.10 0.026 9 193.0 3/11/2020 0.18 0.039 4 43.0 7/7/2020 0.00 0.000 10 49.0 8/3/2020 0.05 0.000 16 39.2 9/16/2020 0.04 0.000 8 52.6 11/2/2020 0.24 0.104 20 119.0 2020 Average 0.10 0.028 11.17 82.63 AVERAGE 0.17 0.044 15.40 181.79 MEDIAN 0.14 0.018 11.50 74.60 MAX 0.68 0.384 89.00 3440.00 MIN 0.00 0.000 2.00 19.46 STDEV 0.15 0.079 14.71 554.52 75TH PERCENTILE 0.20 0.038 18.00 122.50 25TH PERCENTILE 0.09 0.007 7.00 43.95 1 - Water quality analysis was performed by William Lloyd / Tri-City Laboratory Location 9 Indicates sample result below lab detection limits, 1/2 MDL value reported Water Quality Sampling Results WSB Project No. 016347-000 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN Sampling Date1 Total Phosphorus (mg/L) Ortho Phosphorus (mg/L) Total Suspended Solids (mg/L) Chloride (mg/L) 6/10/2014 0.14 0.050 3 7/16/2014 0.26 0.010 19 8/11/2014 0.86 0.070 340 9/17/2014 0.41 0.010 66 10/28/2014 0.68 0.060 22 5/20/2015 0.26 0.040 59 7/14/2015 0.24 0.010 32 8/6/2016 0.23 0.020 26 8/25/2015 0.25 0.020 38 9/22/2015 0.21 0.010 19 10/29/2015 0.13 0.005 17 4/28/2016 0.12 0.010 37 12.9 5/26/2016 0.43 0.060 53 25.4 6/23/2016 1.06 0.740 35 40.8 7/16/2016 0.33 0.040 48 21.8 8/31/2016 0.24 0.010 35 21.6 9/27/2016 0.25 0.020 20 21.4 10/24/2016 0.26 0.010 33 15.3 4/28/2017 0.05 0.020 13 96.4 5/25/2017 0.05 0.010 10 58.0 6/21/2017 0.30 0.029 50 53.1 7/31/2017 0.22 0.000 35 35.1 8/30/2017 0.25 0.000 65 27.9 9/27/2017 0.28 0.036 59 24.2 10/31/2017 0.21 0.016 32 16.9 5/30/2018 0.32 0.000 32 86.7 6/27/2018 0.24 0.003 31 69.6 7/25/2018 0.33 0.020 97 51.6 8/29/2018 0.29 0.020 50 38.2 9/27/2018 0.21 0.003 32 39.6 10/29/2018 0.07 0.010 11 30.7 6/25/2019 0.13 0.000 20 72.0 7/17/2019 0.16 0.007 40 49.4 8/12/2019 0.24 0.010 51 46.3 9/17/2019 0.22 0.078 41 31.8 10/8/2019 0.15 0.029 27 27.9 7/7/2020 0.13 0.000 43 39.6 8/3/2020 0.17 0.000 31 35.7 9/16/2020 0.20 0.000 36 29.2 11/2/2020 0.22 0.000 21 38.5 2020 Average 0.18 0.000 32.75 35.75 AVERAGE 0.27 0.037 43.23 39.92 MEDIAN 0.24 0.010 34.00 35.70 MAX 1.06 0.740 340.00 96.40 MIN 0.05 0.000 3.00 12.88 STDEV 0.20 0.116 51.41 20.69 75TH PERCENTILE 0.29 0.029 49.50 50.50 25TH PERCENTILE 0.17 0.010 21 23.0 1 - Water quality analysis was performed by William Lloyd / Tri-City Laboratory Location 10 Indicates sample result below lab detection limits, 1/2 MDL value reported Water Quality Sampling Results WSB Project No. 016347-000 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN Birger Sampling Date1 Total Phosphorus (mg/L) Ortho Phosphorus (mg/L) Total Suspended Solids (mg/L) Chloride (mg/L) 6/10/2014 0.04 0.030 34 60.4 7/16/2014 0.36 0.040 24 8/11/2014 0.04 0.020 8 39.8 9/17/2014 0.19 0.070 11 10/28/2014 0.10 0.070 2 40.4 2/16/2016 0.07 0.010 2 44.6 3/16/2016 0.03 0.010 4 53.5 2/14/2018 0.17 0.046 4 44.4 3/14/2018 0.22 0.020 10 58.1 1/7/2019 0.06 0.020 5 49.7 3/11/2019 0.05 0.046 5 50.1 2/12/2020 0.08 0.00 9 65.8 3/11/2020 0.14 0.00 6 27.7 2020 Average 0.11 0.000 7.50 46.75 AVERAGE 0.12 0.029 9.54 48.59 MEDIAN 0.08 0.020 6.00 49.70 MAX 0.36 0.070 34.00 65.80 MIN 0.03 0.000 2.00 27.70 STDEV 0.10 0.024 9.32 10.81 75TH PERCENTILE 0.18 0.046 10.50 58.10 25TH PERCENTILE 0.05 0.010 4.00 40.40 1 - Water quality analysis was performed by William Lloyd / Tri-City Laboratory Indicates sample result below lab detection limits, 1/2 MDL value reported Sampling Date1 Total Phospho rus (mg/L) Ortho Phosphor us (mg/L) Total Suspend ed Solids (mg/L) Chloride (mg/L) 2014 0.19 0.08 6.00 2014 0.28 0.02 9.00 2014 0.09 0.04 6.00 2014 0.17 0.02 7.00 2014 0.18 0.01 16.00 2015 0.20 0.13 3.00 2015 0.13 0.07 4.00 2015 0.13 0.02 6.00 2015 0.16 0.08 7.00 2015 0.15 0.10 6.00 2015 0.15 0.04 5.00 2016 0.08 0.07 2.00 34.70 2016 0.10 0.08 2.00 33.50 2016 0.30 0.19 27.00 20.70 2016 0.09 0.02 3.00 18.10 2016 0.11 0.02 3.00 11.10 2016 0.15 0.09 1.00 8.15 2016 0.20 0.10 1.00 8.40 2017 0.13 0.08 2.00 91.80 2017 0.08 0.01 1.00 56.00 2017 0.11 0.06 6.00 61.50 2017 0.22 0.02 24.00 20.40 2017 0.12 0.05 36.00 14.90 2017 0.10 0.03 4.00 15.90 2017 0.11 0.02 3.00 14.90 2018 0.19 0.02 15.00 62.30 2018 0.12 0.05 11.00 60.00 2018 0.06 0.02 6.00 49.60 2018 0.06 0.00 3.00 39.20 2018 0.01 0.04 4.00 25.30 2018 0.10 0.03 5.00 24.00 Location 1 -Marcotte 1408 Water Quality Sampling Results Annual summary concentrations of Total Phosphorus, Ortho -Phosphate, Total Suspended Solids, and Chloride 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Sampling Date1 Total Phospho rus (mg/L) Ortho Phospho rus (mg/L) Total Suspend ed Solids (mg/L) Chloride (mg/L) 2014 0.18 0.090 0 2014 0.40 0.010 11 2014 0.04 0.050 100 2014 0.23 0.030 10 2014 0.07 0.010 4 2015 0.06 0.030 16.0 2015 0.13 0.070 11.0 2015 0.07 0.060 2.0 2015 0.14 0.060 13.0 2015 0.24 0.030 17.0 2015 0.05 0.005 5.0 2016 0.10 0.03 6 29.0 2016 0.18 0.04 12 38.2 2016 0.24 0.01 30 16.0 2016 0.17 0.02 17 11.4 2016 0.19 0.01 17 5.6 2016 0.16 0.04 8 13.1 2016 0.10 0.01 6 10.2 2017 0.13 0.08 8 91.8 2017 0.02 0.03 8 52.0 2017 0.22 0.00 15 48.6 2017 0.15 0.00 13 10.8 2017 0.01 0.00 13 6.8 2017 0.09 0.03 17 20.1 2017 0.13 0.01 13 15.0 2018 0.13 0.00 6 73.3 2018 0.09 0.00 2 36.2 2018 0.04 0.01 6 28.3 2018 0.08 0.02 8 13.6 2018 0.04 0.01 5 17.3 2018 0.09 0.01 9 13.2 Location 2 –Glendalough 1486 Water Quality Sampling Results Annual summary concentrations of Total Phosphorus, Ortho -Phosphate, Total Suspended Solids, and Chloride 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Sampling Date1 Total Phospho rus (mg/L) Ortho Phosphor us (mg/L) Total Suspend ed Solids (mg/L) Chloride (mg/L) 2014 0.10 0.100 1 2014 0.18 0.050 2 2014 0.33 0.110 14 2014 0.21 0.030 10 2014 0.15 0.010 1 2015 0.20 0.090 6.0 2015 0.20 0.160 2.0 2015 0.35 0.100 30.0 2015 0.15 0.110 7.0 2015 0.24 0.090 13.0 2015 0.26 0.160 10.0 2016 0.19 0.05 13 53.9 2016 0.47 0.05 26 19.3 2016 0.41 0.17 3 6.5 2016 0.19 0.10 6 4.1 2016 0.14 0.10 10 6.9 2016 0.25 0.01 8 9.3 2016 0.36 0.03 14 7.2 2017 0.06 0.02 8 109.6 2017 0.05 0.00 3 13.2 2017 0.22 0.04 9 16.0 2017 0.13 0.02 8 7.4 2017 0.07 0.00 4 7.7 2017 0.14 0.02 1 8.0 2017 0.24 0.06 6 21.5 2018 0.39 0.05 55 32.0 2018 0.13 0.08 2 14.8 2018 0.03 0.02 5 13.6 2018 0.14 0.07 17 6.6 2018 0.98 0.07 3 14.0 2018 0.21 0.07 10 15.0 Location 3 –Trailer Park 1589 Water Quality Sampling Results Annual summary concentrations of Total Phosphorus, Ortho -Phosphate, Total Suspended Solids, and Chloride 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Sampling Date1 Total Phospho rus (mg/L) Ortho Phosphor us (mg/L) Total Suspend ed Solids (mg/L) Chloride (mg/L) 2014 0.10 0.020 8 2014 0.07 0.000 8 2014 0.15 0.010 22 2014 0.16 0.000 16 2014 0.07 0.000 13 2015 0.07 0.020 15.0 2015 0.08 0.020 9.0 2015 0.13 0.040 18.0 2015 0.13 0.060 10.0 2015 0.11 0.010 17.0 2015 0.07 0.005 14.0 2016 0.07 0.01 10 59.6 2016 0.12 0.01 15 40.5 2016 0.08 0.01 2 37.4 2016 0.06 0.01 13 18.4 2016 0.02 0.01 15 16.0 2016 0.15 0.15 3 33.3 2016 0.07 0.01 3 33.6 2017 0.02 0.02 4 78.4 2017 0.06 0.00 3 59.2 2107 0.08 0.00 3 43.4 2017 0.08 0.01 6 38.1 2017 0.08 0.00 4 36.4 2017 0.04 0.01 5 85.5 2017 0.05 0.02 2 37.3 2018 0.11 0.00 129 64.9 2018 0.19 0.00 5 45.7 2018 0.07 0.02 17 35.8 2018 0.07 0.01 11 18.7 2018 0.07 0.02 11 19.8 2018 0.07 0.00 10 22.1 Location 4 –Unnamed 1687 Water Quality Sampling Results Annual summary concentrations of Total Phosphorus, Ortho -Phosphate, Total Suspended Solids, and Chloride 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Sampling Date1 Total Phospho rus (mg/L) Ortho Phosphor us (mg/L) Total Suspend ed Solids (mg/L) Chloride (mg/L) 2014 0.10 0.02 10 2014 0.16 0.00 11 2014 0.08 0.01 19 2014 0.20 0.00 24 2014 0.14 0.04 15 2015 0.26 0.070 27.0 2015 0.23 0.050 12.0 2015 0.14 0.030 16.0 2015 0.20 0.070 19.0 2015 0.14 0.010 18.0 2015 0.12 0.005 12.0 2016 0.07 0.01 10 45.2 2016 0.07 0.01 20 33.6 2016 0.13 0.01 6 20.6 2016 0.14 0.01 18 10.7 2016 0.20 0.01 19 5.5 2016 0.15 0.04 6 2.5 2016 0.07 0.01 4 38.0 2017 0.02 0.02 8 98.4 2017 0.07 0.00 2 40.4 2017 0.07 0.02 2 41.8 2017 0.05 0.01 2 34.8 2017 0.05 0.00 1 27.9 2017 0.08 0.07 4 27.3 2017 0.07 0.02 2 26.4 2018 0.13 0.00 7 98.6 2018 0.13 0.02 1 55.8 2018 0.07 0.02 11 44.3 2018 0.02 0.01 12 28.4 2018 0.07 0.01 5 25.1 2018 0.07 0.01 7 33.5 Location 5 –Regional 1716 Water Quality Sampling Results Annual summary concentrations of Total Phosphorus, Ortho -Phosphate, Total Suspended Solids, and Chloride 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Sampling Date1 Total Phospho rus (mg/L) Ortho Phosphor us (mg/L) Total Suspend ed Solids (mg/L) Chloride (mg/L) 2014 0.12 0.020 8 7.2 2014 0.10 0.000 11 2014 0.29 0.180 19 20.0 2014 0.26 0.070 12 2014 0.11 0.070 15 9.3 2015 0.24 0.170 4.0 2015 0.21 0.150 5.0 2015 0.41 0.270 13.0 2015 0.23 0.190 7.0 2015 0.33 0.210 5.0 2015 0.23 0.091 12.0 2016 0.23 0.01 14 150.8 2016 0.23 0.09 13 205.2 2016 0.19 0.08 1 13.6 2016 0.23 0.16 7 13.5 2016 0.17 0.05 8 16.8 2016 0.08 0.03 6 2.5 2016 0.01 0.04 9 3.4 2017 0.07 0.03 16 89.4 2017 0.10 0.04 20 28.9 2017 0.17 0.06 8 19.1 2017 0.19 0.12 7 11.4 2017 0.13 0.08 14 7.4 2017 0.50 0.28 17 11.8 10/31/217 0.22 0.09 7 4.9 2018 0.23 0.08 7 67.7 2018 0.30 0.20 15 37.1 2018 0.14 0.09 8 27.4 2018 0.16 0.12 5 9.1 2018 0.13 0.07 5 4.5 2018 0.44 0.06 30 4.8 Location 6 –Erickson 578 Water Quality Sampling Results Annual summary concentrations of Total Phosphorus, Ortho -Phosphate, Total Suspended Solids, and Chloride 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Sampling Date1 Total Phospho rus (mg/L) Ortho Phosphor us (mg/L) Total Suspend ed Solids (mg/L) Chloride (mg/L) 2014 0.45 0.310 2 2014 0.49 0.050 174 2014 0.26 0.020 51 2014 0.15 0.000 9 2014 0.56 0.010 260 2015 0.19 0.120 2.0 2015 1.03 0.070 397.0 2015 0.19 0.030 22.0 2015 0.17 0.050 312.0 2015 0.07 0.010 9.0 2015 0.07 0.005 13.0 2016 0.06 0.01 7 46.3 2016 0.10 0.01 10 37.0 2016 1.03 0.04 29 7.0 2016 0.11 0.01 5 3.9 2016 0.12 0.01 8 4.7 2016 0.18 0.02 6 4.4 2016 0.46 0.01 2 5.8 2017 0.10 0.03 15 99.8 2017 0.09 0.03 4 15.3 2017 0.59 0.08 34 15.7 2017 0.15 0.03 17 5.6 2017 0.13 0.01 60 5.5 2017 0.02 0.02 51 8.4 2017 0.04 0.00 3 8.2 2018 0.20 0.00 4 80.4 2018 0.23 0.06 14 26.4 2018 0.57 0.16 157 28.8 2018 0.38 0.19 34 18.2 2018 0.28 0.05 20 7.6 2018 0.26 0.52 9 10.7 Location 7 –Bloomfield 1864 Water Quality Sampling Results Annual summary concentrations of Total Phosphorus, Ortho -Phosphate, Total Suspended Solids, and Chloride 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Sampling Date1 Total Phospho rus (mg/L) Ortho Phosphor us (mg/L) Total Suspend ed Solids (mg/L) Chloride (mg/L) 2014 0.17 0.030 2 2014 0.27 0.020 45 2014 0.22 0.020 39 2014 0.23 0.000 46 2014 0.08 0.030 19 2015 0.10 0.020 14.0 2015 0.19 0.010 32.0 2015 0.25 0.030 44.0 2015 0.23 0.090 36.0 2015 0.17 0.010 24.0 2015 0.14 0.005 14.0 2016 0.09 0.01 15 193.6 2016 0.13 0.04 3 174.4 2016 0.23 0.05 6 73.6 2016 0.25 0.07 10 47.3 2016 0.03 0.01 5 19.5 2016 0.21 0.01 18 9.6 2016 0.08 0.01 7 8.3 2017 0.10 0.04 7 250.0 2017 0.05 0.01 9 122.0 2017 0.14 0.04 6 110.0 2017 0.19 0.08 9 28.9 2017 0.20 0.02 12 16.4 2017 0.15 0.02 16 18.3 2017 0.11 0.01 8 13.1 2018 0.20 0.04 2 351.0 2018 0.20 0.02 8 159.0 2018 0.61 0.01 98 82.4 2018 0.31 0.00 42 48.7 2018 0.13 0.00 17 20.7 2018 0.09 0.01 11 15.9 Location 8 –O’Leary’s 600 Water Quality Sampling Results Annual summary concentrations of Total Phosphorus, Ortho -Phosphate, Total Suspended Solids, and Chloride 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Sampling Date1 Total Phospho rus (mg/L) Ortho Phosphor us (mg/L) Total Suspend ed Solids (mg/L) Chloride (mg/L) 2014 0.19 0.050 2 2014 0.13 0.000 50 2014 0.19 0.030 14 2014 0.15 0.000 13 2014 0.27 0.020 19 2015 0.16 0.020 19.0 2015 0.10 0.010 17.0 2015 0.12 0.020 18.0 2015 0.15 0.040 16.0 2015 0.09 0.010 11.0 2015 0.19 0.026 18.0 2016 0.28 0.01 22 152.8 2016 0.13 0.03 6 126.0 2016 0.14 0.01 18 58.4 2016 0.11 0.01 8 38.7 2016 0.03 0.01 5 19.5 2016 0.21 0.03 7 22.9 2016 0.28 0.10 16 19.5 2017 0.11 0.05 13 173.4 2017 0.05 0.01 5 108.0 2017 0.15 0.01 22 96.8 2017 0.06 0.01 7 51.0 2017 0.06 0.00 9 35.6 2017 0.05 0.02 5 41.9 2017 0.42 0.21 6 74.6 2018 0.22 0.03 10 155.0 2018 0.13 0.01 5 109.0 2018 0.19 0.02 89 92.0 2018 0.65 0.01 11 75.4 2018 0.09 0.00 9 73.6 2018 0.19 0.04 10 106.0 Location 9 –Wachter 2443 Water Quality Sampling Results Annual summary concentrations of Total Phosphorus, Ortho -Phosphate, Total Suspended Solids, and Chloride 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Sampling Date1 Total Phospho rus (mg/L) Ortho Phosphor us (mg/L) Total Suspend ed Solids (mg/L) Chloride (mg/L) 2014 0.14 0.050 3 2014 0.26 0.010 19 2014 0.86 0.070 340 2014 0.41 0.010 66 2014 0.68 0.060 22 2015 0.26 0.040 59.0 2015 0.24 0.010 32.0 2016 0.23 0.020 26.0 2015 0.25 0.020 38.0 2015 0.21 0.010 19.0 2015 0.13 0.005 17.0 2016 0.12 0.010 37 12.9 2016 0.43 0.060 53 25.4 2016 0.33 0.040 48 21.8 2016 0.24 0.010 35 21.6 2016 0.25 0.020 20 21.4 2016 0.26 0.010 33 15.3 2017 0.05 0.020 13 96.4 2017 0.05 0.010 10 58.0 2017 0.30 0.029 50 53.1 2017 0.22 0.000 35 35.1 2017 0.25 0.000 65 27.9 2017 0.28 0.036 59 24.2 2017 0.21 0.016 32 16.9 2018 0.32 0.000 32 86.7 2018 0.24 0.003 31 69.6 2018 0.33 0.020 97 51.6 2018 0.29 0.020 50 38.2 2018 0.21 0.003 32 39.6 2018 0.07 0.010 11 30.7 Location 10 –Shannon 614 Water Quality Sampling Results Annual summary concentrations of Total Phosphorus, Ortho -Phosphate, Total Suspended Solids, and Chloride 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 Sampling Date1 Total Phospho rus (mg/L) Ortho Phosphor us (mg/L) Total Suspend ed Solids (mg/L) Chloride (mg/L) 2014 0.04 0.030 34 60.4 2014 0.36 0.040 24 2014 0.04 0.020 8 39.8 2014 0.19 0.070 11 2014 0.10 0.070 2 40.4 2015 2016 0.07 0.010 2 44.6 2016 0.03 0.010 4 53.5 2017 2018 0.17 0.046 4 44.4 2018 0.22 0.020 10 58.1 Birger Pond Water Quality Sampling Results Annual summary concentrations of Total Phosphorus, Ortho -Phosphate, Total Suspended Solids, and Chloride 2020 Water Quality and Quantity Monitoring Study City of Rosemount, MN WSB Project No. 016347-000 0501001502002503002/5/2016 8/23/2016 3/11/2017 9/27/2017 4/15/2018 11/1/2018 5/20/2019 12/6/2019 6/23/2020Chloride Concentration (mg/L)Chloride Concentrations Marcotte #1408 (1) 4-Day Chronic Standard (230 mg/L) 0501001502002502/5/2016 8/23/2016 3/11/2017 9/27/2017 4/15/2018 11/1/2018 5/20/2019 12/6/2019 6/23/2020Chloride Concentration (mg/L)Chloride Concentrations Glendalough #1486 (2) 4-Day Chronic Standard (230 mg/L) 0501001502002502/5/2016 8/23/2016 3/11/2017 9/27/2017 4/15/2018 11/1/2018 5/20/2019 12/6/2019 6/23/2020Chloride Concentration (mg/L)Chloride Concentrations Trailer Park #1589 (3) 4-Day Chronic Standard (230 mg/L) 0501001502002502/5/2016 8/23/2016 3/11/2017 9/27/2017 4/15/2018 11/1/2018 5/20/2019 12/6/2019 6/23/2020Chloride Concentration (mg/L)Chloride Concentrations Unnamed #1687 (4) 4-Day Chronic Standard (230 mg/L) 0501001502002503003504002/5/2016 8/23/2016 3/11/2017 9/27/2017 4/15/2018 11/1/2018 5/20/2019 12/6/2019 6/23/2020Chloride Concentration (mg/L)Chloride Concentrations Regional #1716 (5) 4-Day Chronic Standard (230 mg/L) 050010001500200025002/5/2016 8/23/2016 3/11/2017 9/27/2017 4/15/2018 11/1/2018 5/20/2019 12/6/2019 6/23/2020Chloride Concentration (mg/L)Chloride Concentrations Erickson #578 (6) 4-Day Chronic Standard (230 mg/L) Maximum Standard (860 mg/L) 2/5/2016 8/23/2016 3/11/2017 9/27/2017 4/15/2018 11/1/2018 5/20/2019 12/6/2019 6/23/2020 01002003004005006007008002/5/2016 8/23/2016 3/11/2017 9/27/2017 4/15/2018 11/1/2018 5/20/2019 12/6/2019 6/23/2020Chloride Concentration (mg/L)Chloride Concentrations Bloomfield #1864 (7) 4-Day Chronic Standard (230 mg/L) 2/5/2016 8/23/2016 3/11/2017 9/27/2017 4/15/2018 11/1/2018 5/20/2019 12/6/2019 6/23/2020 0501001502002503003504002/5/2016 8/23/2016 3/11/2017 9/27/2017 4/15/2018 11/1/2018 5/20/2019 12/6/2019 6/23/2020Chloride Concentration (mg/L)Chloride Concentrations O'Leary's #600 (8) 4-Day Chronic Standard (230 mg/L) 2/5/2016 8/23/2016 3/11/2017 9/27/2017 4/15/2018 11/1/2018 5/20/2019 12/6/2019 6/23/2020 050010001500200025003000350040002/5/2016 8/23/2016 3/11/2017 9/27/2017 4/15/2018 11/1/2018 5/20/2019 12/6/2019 6/23/2020Chloride Concentration (mg/L)Chloride Concentrations Wachter #2443 (9) 4-Day Chronic Standard (230 mg/L) Maximum Standard (860 mg/L) 2/5/2016 8/23/2016 3/11/2017 9/27/2017 4/15/2018 11/1/2018 5/20/2019 12/6/2019 6/23/2020 0501001502002502/5/2016 8/23/2016 3/11/2017 9/27/2017 4/15/2018 11/1/2018 5/20/2019 12/6/2019 6/23/2020Chloride Concentration (mg/L)Chloride Concentrations Shannon #614 (10) 4-Day Chronic Standard (230 mg/L) 2/5/2016 8/23/2016 3/11/2017 9/27/2017 4/15/2018 11/1/2018 5/20/2019 12/6/2019 6/23/2020 0501001502002502/5/2016 8/23/2016 3/11/2017 9/27/2017 4/15/2018 11/1/2018 5/20/2019 12/6/2019 6/23/2020Chloride Concentration (mg/L)Chloride Concentrations Birger 4-Day Chronic Standard (230 mg/L)