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chevron <br /> Chevron <br /> Chevron U.S.A.Products Company <br /> 6001 Bollinger Canyon Road <br /> July 22, 1996 Building L <br /> San Ramon,CA 94583 <br /> P.O.Box 5004 <br /> San Ramon,CA 94583-0804 <br /> Ms.Mary Meays Marketing—Northwest Region <br /> San Joaquin County Environmental Health Phone 510 842 9500 <br /> P.O.Box 388 <br /> Stockton, CA 95201-0388 <br /> Re: Chevron Station#9-0557, 139 South Center Street, Stockton, CA <br /> Attached Environmental Assessment Report(GTI, 1/25/96) <br /> Dear Ms. Meays: <br /> Please find attached a report dated January 25, 1996,which was prepared by Chevron's consultant, <br /> Groundwater Technology Inc. (GTI),to describe the field procedures and sampling results associated with <br /> additional site assessment work performed at the subject site during November and December, 1995. <br /> During their investigation, GTI drilled four soil borings and converted one of the four into a groundwater <br /> monitoring well. Soil samples were collected from each boring and were analyzed for the presence of <br /> TPHGas and BTEX constituents. Grab groundwater samples were collected from two of the four borings <br /> and were also analyzed for TPHGas and BTEX. <br /> The acquired soil sample results help to define the extent of hydrocarbons in soil near the former UST <br /> complex and current pump island locations. The fuel hydrocarbon detections in soil at downgradient <br /> locations'MW-7 and SB-9 were measured in saturated samples and are most likely associated with the <br /> contaminant plume originating from the subject site. <br /> Monitoring well MW-7 has been incorporated into the existing monitoring and reporting program for the <br /> subject site. If you have any questions or comments,I can be reached at(5 10) 842-8695. <br /> Sincerely, <br /> Brett L.Hunter <br /> Environmental Engineer <br /> Site Assessment and Remediation <br /> Attachment <br /> cc: Elizabeth Thayer, Central Valley RWQCB, Sacramento, CA <br /> Tom Portele, Greyhound Lines,P.O. Box 660362,Dallas, TX 75266-0362 <br />