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AEGIS ENVIRONMENTAL , <br /> INC <br /> 1050 Melody Lane, Suite 160, Roseville, CA 95678 + 996. 782 2110/916.969-2110/ FAX 916 - 786-7830 <br /> January 6, 1992 <br /> off <br /> JAN 0 9 1992 <br /> Steve Schneider ENVIRONME =AI. HEALTH <br /> San Joaquin County Public Health Services PERMIT/Kkvicn <br /> Environmental Health Division <br /> Post Office Box 2009 <br /> 1601 East Hazelton Avenue <br /> Stockton, California 95201 <br /> Subject Quarterly Groundwater Monitoring Report <br /> Shell Oil Company Service Station (WIC #204-7525-0104) <br /> 6131 Pacific Avenue, Stockton, California <br /> Dear Mr Schneider <br /> Aegis Environmental, Inc (Aegis), wishes to call to your attention an error in our previous <br /> "Quarterly Groundwater Monitoring Report,"for the subject site, dated September 4, 1991 <br /> The potentiometric surface map (Figure 5) for July 17, 1991, included in the report, <br /> indicates the estimated direction of groundwater flow is to the west, at an average <br /> gradient of 0 01 ft/ft (1 0 percent) This estimation is incorrect The corrected <br /> potentiometric surface map (Figure 5 attached) indicates groundwater on July 17, 1991, <br /> is estimated to flow to the southeast at an average gradient of 0 001 ft/ft (0 1 percent) <br /> The corrected flow direction and gradient are consistent with previous (i e , April 9, 1991) <br /> and subsequent (i e , October 17, 1991) estimations The error was due to an incorrect <br /> calculation of groundwater elevation in monitoring well MW-1 <br /> Please replace Figure 5 in the September report with the attached Figure 5 <br /> 90 020N QTR <br /> GEOLOGISTS - ENGINEERS - GROUND WATER SCIENTISTS <br />