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10 <br /> (W <br /> AEGIS ENVIRONMENTAL , INC . <br /> 801 Riverside Avenue,Suite C,Roseville,CA 95678 ♦ 916.782-2110 1916-969-2110/FAX 916.786-7830 <br /> 13 March 1991 pq p <br /> Mr. F. Kurt Miller ENVIMWP,"'1ErarAL Hit- ail-r <br /> Shell Oil Company PEW�jI US�M'V' 'A <br /> Post Office Box 4023 <br /> 1390 Willow Pass Road, Suite No. 900 <br /> Concord, California 94524 <br /> Re: Quarterly Ground Water Monitoring Report <br /> Project Status Review <br /> Shell Service Station (WIC #204-7525-0104 ; CT #5441) <br /> 6131 Pacific Avenue <br /> Stockton, California <br /> Aegis Project No. 90-020 <br /> Dear Mr. Miller: <br /> Aegis Environmental, Inc. is pleased to submit the latest quarterly <br /> ground water monitoring report for the subject site. Aegis is <br /> submitting copies of the report to Shell, the Central Valley <br /> Regional Water Quality Control Board and the San Joaquin County <br /> Local Health District, Environmental Health Division. <br /> Aegis has increased the frequency of liquid-level measurements in <br /> the three on-site monitoring wells from monthly to weekly. This is <br /> due to the observation of trace free product in Monitoring Well No. <br /> 3 during the January 1991 sampling event. If the thickness of free <br /> product increases to approximately 0. 5 foot, free product bail down <br /> and recovery testing will be initiated. <br /> The next ground water sampling event is scheduled for mid-April. <br /> The next draft quarterly report will be submitted in May 1991. <br /> Aegis is currently pursuing right-of-entry agreements with adjacent <br /> and nearby property owners to install off-site ground water <br /> monitoring wells. Aegis is also soliciting bids for vapor <br /> extraction pilot testing from potential subcontractors. It is <br /> possible Aegis will perform the testing utilizing in-house <br /> resources, depending on cost/benefit analysis. <br /> 90-020A.LTR <br /> OMRCOVR.LET <br /> GEOLOGISTS • ENGINEERS • GROUND WATER SCIENTISTS <br />