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e <br />STATE O�-GAYF(RNIA AELGEORGE DEUKMEJIAN, Governor <br />CALIFORNIA REGIONAL WATEM QUALITY CONTROL BOARD- <br />CENTRAL, VALLEY REGION <br />3443 ROUTIER ROAD e . <br />SACRAMENTO, CA 95827-3098 •�' <br />29 November 1988 <br />f <br />t <br />Mr. Greg Bassos <br />Forward Inc. <br />P. 0. Box 6336 <br />Stockton, CA 95206 <br />FORWARD LANDFILL, SAN JOAQUIN COUNTY (CASE NO. 2209) <br />We have reviewed the plans for construction of a Class II <br />surface impoundment submitted by Mr. Michael Bidart of EBA. <br />The planned impoundment is proposed to be an interim waste <br />management unit (WMU) with an anticipated service life of 1 <br />to 2 years. The plans call for a single three-foot thick <br />compacted clay liner placed on compacted subgrade. Compacted <br />clay levees will be built on top of the liner to a height of <br />approximately seven feet. A geosynthetic reinforced flexible <br />membrane liner (FML) and 6 inches of soil will be placed over <br />the completed clay liner for protection from desiccation. <br />The impoundment size was calculated on the basis of a 100 - <br />year wet season with leachate anticipated from WMU D (a Class <br />III landfill) and WMU E (a Class II ash monofill) and surface <br />runoff from portions of WMU A (an inactive Class II -I unit <br />undergoing closure construction) where cap foundation layer <br />material is stockpiled. The floor of the proposed surface <br />impoundment will be approximately 150 by 200 feet in size. <br />The impoundment capacity with two feet of freeboard is 1.2 <br />million gallons. <br />A construction quality assurance (CQA) plan and impoundment <br />monitoring program are also proposed in the EBA report. The <br />CQA tests and frequency are acceptable as proposed. The test <br />methods to determine the depth of liner penetration by <br />leachate need to be specified. Details of the plan should <br />include: sample collection method; physical and chemical <br />parameters to be used as indicators of leachate penetration; <br />and extraction and analytical procedures for leachate <br />parameters. In addition, samples of liner need to be tested, <br />using the proposed methods, prior to operation of the surface <br />impoundment to establish background values for the leachate <br />parameters. <br />The planned surface impoundment is regulated by the existing <br />waste discharge requirements (WDRs) for the landfill as <br />WMU "F". Board staff has determined that the proposed plan <br />meets or exceeds the minimum requirements for a Class II <br />surface impoundment. Therefore, the design and construction <br />of WMU F is approved as a Class II waste management unit <br />subject to the following conditions: <br />