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A <br /> WSB <br /> I I I N a,"1 0;5 1 C 10 701 Xenia Avenue South <br /> 1"vo, hir, f 8 <br /> Suite 300 <br /> Minneapolis,MN 55416 <br /> Tel: 763-541-4800 <br /> Fax: 763-541-1700 <br /> Technical Memorandum <br /> To: Suzanne Fischer, City of Elk River <br /> From: Pete Willenbring PE, WSB &Associates,Inc. <br /> Erick Francis, WSB &Associates,Inc. <br /> Date: January IS, 2014 <br /> Re: Results for Stormwater Pond Surveys and Sediment Sampling <br /> City of Elk River,MN <br /> WSB Project No. 1992-06 <br /> The purpose of this technical memorandum is to summarize the stormwater pond sediment <br /> sampling and pond volume survey results for the ponds identified on figure A. <br /> Z-11) <br /> SEDIMENT SAMPLING RESULTS <br /> Sediment samples were collected from two locations from within each of the ponds,as shown on <br /> Figure 1, 4, 7, & 10. Samples were analyzed to determine if Polycyclic Aromatic Hydrocarbon <br /> (PAH)were present within the sediment and to identify the Soil Reference Value (SRV) in order <br /> to define the proper handling requirements for the excavation and disposal of the dredged <br /> material. The results of this sediment sampling are outlined below: <br /> Identified Soil Reference Value: <br /> • Orono Lake(Dam)Pond <br /> • Sample I SRV Level: 2.284 <br /> • Sample 2 SRV Level: 0.572 <br /> • Highland and Jackson Pond <br /> • Sample I SRV Level: 2.267 <br /> • Sample 2 SRV Level: 0.152 <br /> • McDonalds and Highway 169 Pond <br /> • Sample I SRV Level: 11.030 <br /> • Sample 2 SRV Level: 53.694 <br /> • American Legion and Rail Road Pond <br /> in Sample I SRV Level: 7.794 <br /> Sample 2 SRV Level: 24.162 <br /> St.Cloud• Minneapolis•St.Paul <br /> Equal Opportunity Employer <br /> wsbeng.com <br /> KAO I -IN010914.d- <br />