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g? JUL 29 AM 9: 36 <br /> McClelland engineers <br /> 2'.40 Eastn in Avenue. '✓entu .a Ca19 a1,1 , <br /> (805:fj44-Si3A Tplea 6i97�'. <br /> July 29, 1988 <br /> Job No. 0588-1603 <br /> California Regional Water <br /> Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, CA 95827-3098 <br /> Attention: Mr. Gordon Lee Boggs <br /> Environmental Affairs <br /> Dewatering Wells <br /> Former Tillie Lewis Foods Canne <br /> Stockton, Californi <br /> As part of the overall remedial activit' s proposed at the former Tillie <br /> Lewis Foods Cannery, McClelland Engineer proposes to construct a series of <br /> dewatering wells and piezometers in th icinity of the tank area. The inner <br /> perimeter dewatering wells (see Pla 1) will be pumped initially to remove <br /> as much free product, as possible, prior to pumping of the outer perimeter iU <br /> wells. The outer perimeter dewatering wells will be pumped during the exca- <br /> vation to facilitate earthwork activities. Discharge water will be treated t <br /> onsite with an oil-water separator and conveyed to the local sanitary sewer 7 <br /> pursuant to the City of Stockton, Municipal Utilities Department regulations. / C. <br /> he piezometers will be used to monitor water levels during the dewatering . ' <br /> tivities. Details of the Remediation Plan were provided by Ogden <br /> Environmental Services in a report dated May 1988. <br /> McClelland proposes to install approximately 182 dewatering wells (at <br /> CSU 6-foot spacing intervals) , and approximately 10 piezometers (see Plate 1 for j <br /> locations) . Our services will include the following: <br /> J1. Drill well holes for dewatering wells to a depth of about 30 feet <br /> for inner perimeter wells and 30 to 50 feet for outer perimeter <br /> wells] install 4-inch-diameter PVC wells; develop wells to maximize <br /> yield; install jet educator pumps and plumbing connections to the <br /> water treatment unit. <br /> 2. Drill well holes for piezometers to depths ranging from about 12 <br /> feet to 50 feet below ground surface; install 2-inch-diameter PVC <br /> wells and develop accordingly. <br /> 3. Containerize soil cuttings from the inner perimeter wells onsite. <br /> (These cuttings will subsequently be thermally treated with the <br /> Circulating Bed Combustor (CBC) . The outer perimeter wells are <br /> beyond the zone of contamination as defined in the assessment <br /> report dated May 20, 1988. In the unlikely event that contami- <br /> nation is observed in these borings, soil cuttings will be contain- <br /> erized for subsequent treatment.) <br />