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07/71/98 TUE 10:09 FAX 6124825232 RAMSEY CO PUBLIC WORKS 16002 Silver Lake West Diagnostic/Feasibility Workplan January 18, 1995 .Inflow- Monitoring The objective is to measure inflow water and phosphorus loads to Silver Lake. Major emphasis is given to the combined Apache Plaza inlet and lake outlet stormsewer. Four additional stormsewer inlets will be sampled at a reduced level of effort. This element is scheduled to begin March 1996. The spring and growing season period is divided into three 2-month periods, within each of which stormsewer loads will be characterized. The Apache Plaza-lake outlet site will require 3 months of monitoring operation within the 6-month period, 1 month for each of the 2-month periods. The other four monitoring sites will require 1 month of monitoring operation over the 6-month period, for a total of 4 months. Adding these together, a total of 7 months of single monitoring site operation is proposed. Equipment lease rates obtained from Montgomery Watson are $390 per month for an ISCO flow recorder with stormsewer insert and data logger plus $390 per month for an automatic sampler. The equipment cost for this monitoring effort is $5,460 plus $500 for `miscellaneous supplies. Manpower requirements include 60 hours technician time supplied by Montgomery Watson at a cost of $2, 760 . Ramsey County will provide an equivalent stafftime commitment for this element. Composite water samples will be analyzed for total and total dissolved phosphorus, total Kjeldahl nitrogen, total suspended solids, and chloride. Laboratory analyses will be completed by Ramsey County. Kater Quality Monitoring In-lake water quality sampling will begin in November 1995 and continue through October .1996 . Monthly sampling will be done September through April, with semimonthly sampling May through August. Two locations will be sampled in the lake; a shallow site and in the deepest part of the lake. Profile sampling will be done at each site. The sampling will be completed by the County according to the regular protocol of the ongoing County lake monitoring program. Phytoplankton and zooplankton enumeration will be completed for each sampling visit. A macrophyte survey will be completed by the County during mid-summer 1996. Sediment Analyses . A qualitative sediment survey throughout the basin will be completed by the County to characterize texture and composition.