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PUBLIK HEALTH SER-vICES 9.�...C.W!N..0 <br /> o� <br /> SAN JOAQUIN COUNTYAl <br /> r. ? <br /> JOG[KHANNA M.D.,M.P.H. <br /> y'. < <br /> Health Officer <br /> P.O. Box 2009 0 (1601 East Hazelton Avenue) 0 Stockton, California 95201 <br /> C,CI F OR'�\P <br /> (209) 468-3400 <br /> MARLA D GUENSLER <br /> EXXON COMPANY USA <br /> P o BOX 4032 DEC 2 2 1992 <br /> CONCORD CA 94524-2032 <br /> RE: (former Exxon #7-3942) SITE CODE: 2231 <br /> 4444 Pershing Ave. <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed <br /> the review of the "Report of Quarterly Sampling and Analysis" prepared by your consultant <br /> E.A. Engineering, Science, and Technology for the above reference site and has the following comments. <br /> It has been reported RW-3 and V-4 contain free phase petroleum hydrocarbon. Until Exxon has secured a <br /> NPDES permit and active groundwater treatment initiated, passive mitigation measures must be taken to <br /> reduce plume migration from the former tank field. Also the vertical limits of soil contamination in this <br /> area has not been fully identified. The full extent of contamination must be characterized in order to <br /> design a proper remediation system. <br /> Due to decreasing water levels in the area, MW-8 and MW-10 are now dry. In order to monitor off-site <br /> conditions, additional deeper monitoring wells must be installed in the areas of MW-8 and MW-10. <br /> Pursuant to Chapter 16, Section 2652(d) of the "Underground Storage Tank Regulations" (California Code <br /> of Regulations, Title 23), quarterly monitoring reports shall be submitted to PHS/EHD and the Central <br /> Valley Regional Water Quality Control Board (CVRWQCB) until the investigation and cleanup of the site <br /> is deemed adequate. <br /> Should you need further information or clarification, contact Harlin Knoll, Senior REHS, of my staff at <br /> (209) 468-3442. <br /> Jogi Khanna, M . M.P.H. <br /> Health Office <br /> ?114�gg�raiAar�nager <br /> Tn'uv <br /> iA Cotulla, S <br /> rmeI Hlth Division <br /> /HKICVRWQCB <br /> c: E.A. Engineering Science, and Technology <br /> 41 Lafayette Circle <br /> Lafayette, CA 94549 <br /> A Division of San Joaquin County Health lace Semees 10 <br />