Agenda Packets - 2014/05/27 - Laserfiche WebLink

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Mounds View City Council March 24, 2014 Regular Meeting Page 7 1 Ayes – 5 Nays – 0 Motion carried. 2 3 E. Resolution 8230, Authorizing Barr Engineering to Perform Phase 1 Sediment 4 Sampling for Silver View Pond. 5 6 Public Works Director DeBar stated as a requirement of the City’s MS4 permit, the City had to 7 manage, operate and maintain its stormwater system in a manner that reduced discharged 8 pollutants to the maximum extent practical. He reported Silver View Pond was excavated in 9 1982 to accommodate stormwater management on a 146-acre development. This pond has three 10 distinct arms and, over the years, the permanent storage area has filled with sediment. 11 12 Public Works Director DeBar indicated the MPCA recommends that stormwater ponds be 13 evaluated for sediment removal when the pond volume is reduced to 50%. This occurs roughly 14 once every 30 years. He indicated the Council authorized Barr Engineering to complete a 15 sediment survey in 2012. At that time, Barr Engineering determined that Silver View Pond was 16 38% full of sediment. Staff briefly discussed the estimated expense for the dredging of Silver 17 View Pond and recommended the Council authorize Barr Engineering to perform the Phase 1 18 Sediment sampling. He explained the City had funds available to cover the expense of the 19 sampling. He reported that after the testing was completed, the Council could evaluate when the 20 pond would need to be dredged and could apply for grants to assist with the expense. 21 22 Council Member Mueller questioned what information the City would gather from the testing 23 results and asked how long test results would stand. Public Works Director DeBar explained the 24 test results would provide the Council with information on the type and classification of the 25 sediment in the pond. Staff further discussed the benefits of knowing the classification of the 26 sediment within Silver View Pond noting the expense for dredging would also be greater 27 understood. He believed that based on past experience with the PCA, the samples taken in 2014 28 could be used for future dredging. 29 30 Mayor Flaherty inquired what information Barr Engineering would provide the City from the 31 samples. Public Works Director DeBar indicated the report from Barr Engineering would 32 explain where the samples were taken from the pond, an estimation of when the pond should be 33 dredged, a cost estimate for dredging, and what future work may be required on the pond. 34 35 Mayor Flaherty expressed frustration with the 21% increase in the expense for the sample testing. 36 He requested staff speak with Barr Engineering regarding this matter. 37 38 Council Member Meehlhause asked if the amount of sediment within the pond affected the 39 expense of the dredging. Public Works Director DeBar reported there was a direct correlation 40 between the amount of sediment that would need to be removed and the expense. 41 42 Council Member Meehlhause stated the $1-$2 million expense for dredging this pond was a huge 43 expense given the fact the City only has a $5 million yearly budget. Public Works Director 44 DeBar explained that the information gathered from the samples would assist the City in 45