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February 13, 2002 <br />_ Project 62400145 'x <br />Mr. Sam Savig <br />San Joaquin.County <br />Environmental Health Department <br />304 East Weber Avenue,' Third Floor <br />Stockton, California 65202 <br />_ - e <br />' Dear Mr. Savig: <br />Subject: Well Permit Application <br />The Earthgrains Company Facility <br />2651 South Airport Way' J <br />Stockton, California <br />As you are aware„Philip Services Corporation (PSC) has been.performing (since , r <br />_ 'April 2001) air sparging and soil venting at the subject facility to address <br />petroleum hydrocarbon impact from a former underground storage tank. We have <br />also been performing quarterly monitoring to evaluate evolving groundwater <br />conditions. <br />W <br />Our latest round of groundwater analytical results, of samples collected in January <br />2002, indicate that petroleum hydrocarbon concentrations are not decreasing at . <br />the rate we had hoped to observe (see attached tables): It is PSC's opinion that air <br />sparging in the current well (SP -1) is not having the desired effect. Therefore, <br />PSC is proposing to install one new air sparging well (SP -A) within the area of <br />highest impact, just west of well MW -1 as shown in the attached figure., <br />Well Construction <br />As illustrated in the attached Air Sparge Well Construction diagram, SP -A will be <br />auger drilled to a depth of about 73 feet below ground surface. Approximately 70 <br />feet of 1/4 -inch diameter PVC sparge casing will be installed through the augers. A _ <br />•2 -feet long, 2.5 -inch diameter, ceramic air diffuser will be threaded onto the <br />bottom of the casing. <br />Annular space will be filled with a porous sand pack to a depth of about 2 feet <br />above the air diffuser:” About 3 feet of -bentonite chips will be placed above the <br />sand pack and the remaining annular space will be tremie-filled with cement... <br />grout. <br />PHILIP ENVIRONMENTAL SERVICES CORPORATION E <br />210 West Sand Bank Road * P.O. Box 230 • Columbia,, -IL 62236-0230 <br />(618) 281-7173 • {8001 733-7173 • Fax (618) 281-5120 <br />