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Home My WebLink About6.b. CleanSoils, Inc. - Planned Unit Developmentr CITY OF ROSEMOUNT EXECUTIVE SUMMARY FOR ACTION City Council Meeting Date: August 20, 1996 AGENDA ITEM: CleanSoils, Inc. - Planned Unit Development AGENDA SECTION: New Business PREPARED BY: Dan Rogness, Community Development AGENDA NO. . Director TEM #6-B ATTACHMENTS: Memo from Tim Brown, revised site plan APPROVED BY: and gradina plan Mr. Jack Poucher, President of CleanSoils has revised the plan for collocating his petroleum contaminated soil processing business on the Continental Nitrogen Resources Site. He has been working closely with Tim Brown, Rosemount's new Water Resources Coordinator. The result of these discussions has been the relocation of the processing area to an area that is enclosed by a berm to respond to potential storm water runoff contamination concerns. The plan shows that the processing area will be contained by an 8 to 15 foot high berm which CleanSoils is willing to line. The liner in addition to the asphalt or concrete pad should protect ground water as well as contain a 24 hour - 100 year rainfall event. Planning Staff believes that appropriate documentation of permits from the Minnesota Pollution Control Agency and the Dakota County Department of Environmental Health will safeguard the management of the operation and potential environmental impact issues. The City may require a security that would be intended for site restoration in the event of abandonment. However, the County requires financial assurance as part of a closure plan that may include local requirements as well. The Planning Commission reviewed this item on July 23, 1996, and August 13, 1996, and have recommended approval subject to 6 conditions. RECOMMENDED ACTION: Motion to approve the CleanSoils / Continental Nitrogen Resources multiple General Industrial use PUD subject to: 1) Provision of documentation of required MPCA and County permits specifically for the CNR site. 2) Approval of a grading permit as required by the Public Works Department. 3) Provision of a liner for the stockpile area including the internal side of the berm to contain runoff from a 24 hour -100 year rainfall event in addition to the sedimentation basins indicated on the plan. 4) Provision of a security in a form acceptable the City Administrator for the purpose of site restoration to enable future General Industrial redevelopment. 5) Conformance with all applicable requirements specified for Recycling Operations, Section 14.9 including such additional conditions as may be required to ensure compliance with Ordinance B, the Zoning Ordinance. 6) Execution of a PUD agreement with the operator, property owner and the city to secure the conditions of operations, securities and responsibilities of the parties to the agreement. CITY COUNCIL ACTION: MEMO August 8, 1996 To: Bud Osmundson, Public Works Director From: Tim P. Brown, Water Resources Coordinator RE: CleanSoils Second Site Plan On August 7 Ric Pearson and I visited the second site proposed for CleanSoils soil treatment facility at the eastern end of Continental Nitrogen's site (see attached map). The location is currently a "junkyard" area where miscellaneous hardware, pipe, ect. is stored. This second site is far superior to the first. Here a 8-15 foot berm exists that will be incorporated into the soil site facility. This berm could provide a barrier to flow down the slope toward the south which leads off the property. They have also increased the storm water storage capacity from 16,368 W to 22,200 ft'. This is close to the one hundred year capacity (87% or 4.7 inches of rain) that I recommended on my July 10 memo. As with the first plan, both the pad and retention basins are lined. Jack Poucher of CleanSoils (483-4600) seemed very candid in answering questions. He told me that all, or nearly all, contaminated soil will come from outside Rosemount, although they would eventually like to deal with PCB remediation at Continental Nitrogen. Incoming soils are checked for constituents by the MPCA and CleanSoils is limited to treating only highly volatile gasoline -diesel type of contaminants by their lengthy air discharge permit with the state. Soils are transported in regular open dump trucks. Soils treated are then sampled for contaminants and if clean are delivered back to a contaminated site, or in this case may be used as fill to remove the long slope between this site and the southern boundary. Storm water collected in the basins is pumped back over the soil to allow evaporation and re -adsorption of contaminants to the soil. I believe that the prospect of potential offsite transport is greatly diminished in the currently proposed location. Berming, increased distance to property lines, and increased water retention capacity should greatly enhance transport minimization. Key here is maintenance of these safe guards. I recommend that if we approve this plan we reserve the right to inspect their operation at our discretion. V-11 - �'r��at'��. Y."' '.a��._... --3 - •�.•_ L 1_-' �.. •: ,C ; fir. j�� G: :v- - z r- - t i ,!!�� .i.� `rL �� , - `� �'�1., ' � �E'� ..� fay, • � � ,a..rY� _ ]"a—��)= � Vis.__ _` �rcc „ • -^� � . '''�' ..� \ � � w - E 'S•--,,' £ �'Lt .I, - _ '-_ � � - � �� '�• ��. yr ._ .,,[t- .,� rr „•• _ a,. 'west \ � - :moi.. •^' ' � //' •; \ '' '� � �� "" r 1 1 r L '106 \ i zz 1 °peaop \ o0 s' °°° ' t \ \ {xX Y CKs 6-> 1 ,\ , �.\ ^�uT C-,TrC:klHTY1 CT-CT Qom(. )m L,tnH iII 1' 1 to L oah 00 b '941 Sr�s r Ai' -I �IIJ 11 .^xiT CTITf1CA1H7;^1 G1�.CT QG . Jr.1 �1flH Z Sa' 4�IGurh-fy�;CaG FLAOT -•— FEED �o� L rol4kG E Ico R Co A)7-,q.w/dx TEA o614- P, A 2 6 •�►' T�� 1 L+mer � Q RST. a %SA;1n1 r t 5.GT, A A u t • r .�� 24 Rock / SA, -JA 1yMl L (3 C.-rYP) WATER KAPA e i i Y 5TORA46 PAa CA PAc IT'? - 71 Soo rf2(I00'x 2SO'x •3} Esr,.r..+« So'/6 IO' A L CAP, - 7-9) i Ov {{ - MAxIMUM t��+aFAli sionAt�E i.)1_4eS �29�700 (2q0 >< 200)] Z SCALE DATE DATE REVISION BY Clea soils n DRAWN BY CHECKED 8Y 2. R CYCLINLT FACILITY PLAN a. Rosr-moo^�T CMANSDIL4 M,%). T".C. SHEET NO R(WED 8Y q PROJECT NO. DRAWING N0. REwSION N0. 5. ' � MEMO July 10, 1996 To: Bud Osmundson, Public Works Director From: Tim P. Brown, Water Resources Coordinator RE: Site Visit Regarding Continental Nitrogen Site Soil "Recycling" PUD On July 10 I visited the site of the proposed soil treatment facility at the southeast corner of Continental Nitrogen's site. The location is currently vacant with evidence of recent and not -so -recent disposal. Overgrown manmade humps, debris and odors are common. About 200 feet outside of the fence lies a small depression identified on the National Wetland Inventory as a PEMC wetland. The area is currently cultivated and there is no vegetative or hydrologic indication of a wetland there. Drainage off this portion of the site is clearly to the southeast, out of the fenced in area, and toward this depression. This depression almost certainly acts as a focal point for groundwater recharge. See attached figures. The prospect of potential offsite transport leads me to recommend that the lined portion of the retention basins (sumps) be sized for at least the 100 year storm (consistent with other city ponds), plus an additional volume for soil transported into the basins. Loose piles of soil, without containment or restriction, will be transported relatively efficiently for any given storm event into the basins leaving less volume for storm water. It is difficult to estimate the volume of sediments so collected. This volume would depend on rainfall intensity, duration, slopes of soil piles and the slab, and grain size distribution of soil. Based on limited experience I would ask for another 25-50% of the 100 year volume. For the 200 ft by 256 ft area proposed, and a 6 inch rainfall, a volume of 25,600 cubic feet is needed for storm water with an additional 6,400 to 12,800 cubic feet for soil accommodation. In the plan presented the 36 feet of retention pond area is not included in their storm water calculation. Some reliable method of preventing soil erosion into basins might decrease the need for soil volume accommodation. Finally, it would be interesting to know what will be done with water that collects in these lined ponds. Will it be left to evaporate? Pumped to storm water treatment? And will the basin liners be checked for leaks periodically?