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Ms. Suzanne Fischer <br /> January 15, 2014 <br /> Page 2 <br /> SURVEY RESULTS <br /> Surveys of the stormwater ponds were performed to measure the water and sediment depth <br /> within each basin to determine the percentage of lost storage volume due to sedimentation <br /> acumination overtime. Please note estimated pond volumes did not have the benefit of as-built <br /> grading plans to accurately determine the planned storage volumes for each pond. Storage <br /> volumes were based on a treatment volume of a four foot depth within the pond. <br /> The following table outlines the pond survey information, estimated volumes, and excavation <br /> volumes: <br /> Measured <br /> Estimated Average Average Estimated Estimated Estimated Estimated <br /> Pond Water Water Sediment Remaining Excavation <br /> Pond Name Area Volume Depth Sediment Volume Volume Treatment Volume <br /> (SgFtj (CuYd) (ft) Depth(ft) (CuYd) (CuYd) Volume (CuYd) <br /> Orono Lake Fond(loam) 16117.2 23877 2.1 3.7 1253.6 2208.7 47.8% 11342 <br /> Highland/Jackson Pond 7405.2 1097.1 1 1.3 274.3 274.3 25% 822.8 <br /> McDonalds Hwy 169 Pond 19602 2904 0 4 3.8 2904.0 2904.0 75% NA <br /> American Legion RR Pond 5662.8 838.9 0.3 1.1 62.9 62.9 7.5% 776.0 <br /> FINDINGS <br /> Sediment Sampling Findings <br /> • Orono Lake (Dam) Pond <br /> • SRV values ranged from 0.6 to 2.2 <br /> • Sediment within the pond consisted of sand, organic soil, and vegetative debris <br /> o Excavated sediment should be considered a SRV Level 2 <br /> o Soils with a SRV Level 2 is suitable for use on commercial or industrial land uses <br /> • Highland and Jackson Pond <br /> • SRV values ranged from 0.2 to 2.3 <br /> • Sediment within the pond consisted of sand and organic soil <br /> o Excavated sediment should be considered a SRV Level 2 <br /> o Soils with a SRV Level 2 is suitable for use on commercial or industrial land uses <br /> • McDonalds and Highway 169 Pond <br /> • SRV values ranged from 11.0 to 53.7 <br /> • Sediment within the pond consisted of sand and organic soil <br /> • Excavated sediment should be considered a SRV Level 3 <br /> • Soils with a SRV Level 3 or higher must be disposed of at an MPCA approved <br /> landfill <br /> K!V)19924K0ldnii.1D n 1)1992-06 T,,hM­._jX n I d-ig--ft,0;0914 d- <br />