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PUBLrC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY z: Z <br /> Q: .a <br /> JOGI KHANNA N.D.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 (1601 East Hazelton Avenue) Stockton, California 95201 <br /> (209) 468-3400 <br /> JUN 0 3 1991 <br /> DARRELL ROBINSON Fly <br /> SHELL OIL COMPANY <br /> 1390 WILLOW PASS ROAD <br /> CONCORD CA 94520 <br /> RE: Tokay Shell IN REPLY REFER TO SITE CODE: 1906 <br /> 420 W. Kettleman <br /> Lodi, CA <br /> We have completed our review of your"Monitoring Well Installation Results Report"dated March 26, 1991, <br /> and "Quarterly Groundwater Monitoring Report" dated April 30, 1991, prepared by Aegis Environmental, <br /> Incorporated. In the March 26, 1991 report it stated, "groundwater appears to flow southwesterly to <br /> southeasterly." In the April 30, 1991 report is states the gradient is southeast. Monitoring well #3 is <br /> southwest of both the existing underground tank location and the proposed new underground tank location. <br /> There is no monitoring well to the southeast of these locations. A monitoring well should be installed <br /> southeast of these locations since contamination was found in the soil borings drilled in these two areas. <br /> Submit a work plan for the installation of this monitoring well by July 23, 1991. <br /> Fecal coliform was reported in monitoring well #2 at greater than 16mp1/100m1 (most probable number). <br /> This well should be tested for fecal coliform again during the neat quarterly sampling. <br /> Upon review of previous reports there is additional information that should be included in your next <br /> quarterly report. Disposal of the soil generated from drilling borings B1 - B16 has not been documented. <br /> In the report dated March 26, 1991, you state that the soil generated from installation of the monitoring <br /> wells was taken to a landfill in Richmond. Provide receipts to verify the soil was disposed of at this landfill. <br /> In the"Pre-Tank Replacement Site Assessment Results Report"dated October 15, 1989,Aegis Environmental <br /> recommended removing contaminated soils from the proposed underground tank location and sampling the <br /> soil to confirm the excavation was "clean" prior to installing the new tanks. We agree with this <br /> recommendation and anticipate it being incorporated into the future plans for this site. <br /> If you have any questions contact Margaret Lagorio, Senior REHS, of my staff at (209)468-3449. <br /> Jogi Khanna, M.D., M.P.H. <br /> Health Offic <br /> urie A. Cotull , REHS, Program Manager <br /> Environmental Health Division <br /> LAC/ML:nr <br /> A Division of San Joaquin County Health Care Services <br />