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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY (C,4j <br /> JOGI KHANNA M.D,M.P HHealrh Officer P.O. Box 2009 0 (1601 East Hazelton Avrnue) • Stockton, California 95201 <br /> (209)468-3400 <br /> EXXON USA <br /> P O BOX 4032 AUG 2 <br /> CONCORD CA 94524-2032 <br /> RE: Exxon U.S.A. SITE CODE: 2231 <br /> 4444 N. Pershing Ave. <br /> Stockton, CA 94524 <br /> On June 18, 1992 a meeting was held at the San Joaquin County Public Health Services, Environmental <br /> Health Division (PHS/EHD) Office to discuss Exxon's site at 4444 N. Pershing, Stockton and Shell's site at <br /> 4445 N. Pershing, Stockton. <br /> The following people attended the meeting: <br /> Daniel Kirk - Shell Oil Company <br /> Brian Garber - Aegis Environmental, Inc. <br /> Marla Guensler - Exxon Company, USA <br /> Terry Windsor - E.A. Engineering, Science, <br /> & Technology <br /> Douglas Oram - E.A. Engineering, Science, <br /> & Technology <br /> Elizabeth Thayer - Central Valley Regional <br /> Water Quality Control Board <br /> (CVRWQCB) <br /> Margaret Iagorio - PHS/EHD <br /> Harlin Knoll - PHS/EHD <br /> Steven Schneider - PHS/EHD <br /> Michael Collins - PHS/EHD <br /> The purpose of the meeting was to discuss Exxon's groundwater injection proposal which would create a <br /> hydraulic barrier and limit the area of influence of their groundwater extraction system in the up-gradient <br /> direction. Information and concerns discussed were: <br /> -In February 1988 Exxon's monitoring well (MW) 8 was installed in the sidewalk on the west side <br /> of Pershing Avenue. The soil sample collected below first water, 28 feet below ground surface <br /> (bgs), evidenced TPH as gasoline at 3200 ppm. Groundwater samples from MW 8 obtained April <br /> 1988 through May 1991 evidenced groundwater contamination. <br /> -Soil Sample results from Exxon's MW 7, injection well (IW) 1, piezometer (P) 1 and P 2 <br /> (collected 25 feet to 30 feet bgs) were significantly lower than the results from <br /> MW 8. <br /> -Groundwater sample results from Exxon's MW 1, MW 4, MW 7, IW 1, P 1, and P 2 have been <br /> consistently lower than the groundwater sample results from MW 8. <br /> A Division of San Joaquin Counry Health Care Services 10 <br />