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California Rgional Water Quality 161ontrol Board <br /> Central Valley Region <br /> Peter M.Rooney Sacramento Main Office Ed J.Schnabel <br /> Secretaryfor Intemet Address: http://w .swreb.mgov/—mgcb5 Chair <br /> Emironmental 3443 Routier Road,Suite A,Sacramento,California 95827.3003 <br /> Protection Phone(916)255-3000•FAX(916)255-3015 <br /> 30 October 1998 <br /> Mr. Tony Martin <br /> Kleinfelder, Inc. <br /> 2825 East Myrtle Street <br /> Stockton, CA 95205 <br /> SPRECKELS MANTECA, SAN JOAQUIN COUNTY(Case No. 860) <br /> I have reviewed the Proposed Evaluation Monitoring Workplan submitted in response to the facility's <br /> Waste Discharge Requirements(WDRs) Order No. 97-204. I have also reviewed the 4 August 1998 <br /> letter regarding relocation of monitoring well MW-6. <br /> The Proposed Evaluation Monitoring Workplan recommends construction of three wells to a depth of <br /> approximately 35 feet. The wells will be installed to the west, northwest and north of the lime ponds, <br /> between 900 and 1,200 feet away from the northwest corner of the ponds. The proposed analytes are <br /> those required by the WDRs. <br /> The existing well MW-6 is about 2,200 feet northwest from the ponds. It will be abandoned and <br /> reinstalled about 100 feet north of its current location to a depth of about 27 feet. <br /> The goal of evaluation monitoring is to assess the nature and extent of the release from the ponds and <br /> provide information necessary to implement any corrective actions at the site. This includes both <br /> horizontal and vertical extent of the release. The proposed well locations and depths should be based on <br /> expected contaminant migration. The rationale for the well locations however, was not provided in the <br /> workplan. <br /> Based on our 28 October 1998 phone conversation, I understand that the monitoring wells proposed at <br /> locations due north and due west of the ponds are intended to determine the northern and western extent <br /> of the plume. While these new wells are not necessarily downgradient of the ponds,they will serve to <br /> bound the northern and western margins of the plume. The well proposed northwest of the ponds is <br /> intended to determine the length of the plume in conjunction with MW-1 near the ponds and the <br /> proposed MW-6 well. <br /> My remaining concern is the proposed depths and lengths of the well screens. The workplan calls for 20 <br /> foot well screens installed at 15 feet and extending to 35 feet below ground surface. <br /> California Environmental Protection Agency <br /> �d Recycled Paper <br />