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i <br />0 <br />PARSONS <br />2121 North California Boulevard, Suite 500 • Walnut Creek, California 94596 • (925) 941-3700 • Fax: (925) 979-9781 • www•parsons.com <br />January 20, 2006 <br />Ref: 442107 <br />California Regional Water Quality Control Board <br />Central Valley Region <br />11020 Sun Center Drive #200 <br />Rancho Cordova, California 95670-6114 <br />Attention: Mr. Gerald J. Djuth <br />raction <br />Subject: Work Applied l Aerospacan for e l <br />e StructuresCorporation <br />Stockton, California <br />Dear Mr. Djuth: <br />On behalf of Atlantic Richfield Company (a BP affiliated company), Parsons is <br />submitting this work plan for installation of an exttracctionwe (AASC) t fa e south <br />property line at the Applied Aerospace structureCorporation <br />Stockton, California. The y in <br />purpose of the new well ihel viercept cinity nity ooffsite <br />smon o intgowell <br />groundwater contaminants toward the southeast from <br />MW -5R. The area is outside the capture zone of existing remedial groundwater <br />extraction wells. <br />Background <br />In a telephone conference on 12 April 2000, athe Regional fWatereQuality Control <br />o detections Board <br />(RWQCB) requested a statement of contingencies <br />n behalf of BP, Parsons <br />groundwater at monitoring wells MW -6 and Nff 2000 that proposOed additional monitoring to <br />submitted a contingency plan letter (Parsons ) <br />vest , if needed, to <br />determine concentration trends to be followed an ig <br />y oach was oil vapor l <br />pp acceptedtlonby the RVA'QCB <br />locate potential vadose zone sources. This <br />(Isorena 2000). <br />Monitoring revealed that concentrations were �not n bonsigsted of ninand a e direct push bone s <br />was conducted in summer 2003. The investigat o <br />epths <br />to a depth of approximately 50 feet with soil gas sa op chlorinated solvents in the es collected at three to fiveaadose <br />in each boring. The survey found very low levelsThe <br />zone and concentrations in groundwater that were less thanthoseatt N1 - be amenreselts <br />ollutionof this sampling did not point to a nearby source for p'on. The report of <br />remediation by soil vapor extraction or other focuse�Re Pa ons 2003), recommendedfindings, Soil Vapor Investigation, Vial acti <br />cinity of Well M <br />installation of an additional monitoring well offsite to the southeast and continued <br />monitoring for at least one year. <br />