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memorancium CALIFORNIA REGIONAL WA ERQ UALIT AENTRAL TOL BOARD VALLEY REGION 3201 S Street Sacramento, California 95816 Phone: 445-0270 TO: Kenneth Landau FROM: Gary Reents Senior Engineer Area Engineer DATE: 4 June 1985 SIGNATURE: - SUBJECT: HARNEY LANE LANDFILL CLOSURE PLAN , SAN JOAQ COUNTY At our request, the San Joaquin Public Works Department submitted a revised preliminary closure plan for the above subject site prepared by George Nolte and Associates. I have the following comments regarding the submitted plan: 1 . Since the plan proposes closing sections of the landfill as they are filled ( an approach we support ) all design details , construction procedures , cover data, and QA/QC testing procedures must be supplied for our review now. 2 . The proposed flood and runoff holding basin should only contain water for short periods of time to prevent intro- ducing additional water which could produce leachate or raise the existing ground water table . The existence of this pond must also be considered when designing the ground water monitoring system for the site. 3 . The actual calculations for determining the runoff from the 100-year 24-hour storm must be supplied. Calculations for sizing, and eventually design drawings, of all runof control features must also be supplied. Design drawings and calculations for any interim control features must also be submitted. 4 . The final cover will need a drainage layer (high permea- bility ) between the vegetative layer and the low permea- bility layer. This will prevent the development of head over the low permeability layer and water logging of the vegeta- tive layer . A filter will also be necessary between the vegetative layer and the drainage layer to prevent piping of solids which could clog the drainage layer. Additionally, a greater than one foot vegetative layer will probably be necessary to supply enough rooting depth and water holding capacity for the vegatative cover . An analysis must be performed to determine the actual depth necessary.