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SCG <br /> PUBLIC HEALTH SERVICES �0 p4U!N C <br /> o� <br /> SAN JOAQUIN COUNTY =' y <br /> a: < <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> c• . <br /> P.O. Boz 2009 (1601 East Hazelton Avenue) 0 Stockton, California 95201 <br /> 4CiF6it P <br /> (209)46&3400 <br /> EXXON COMPANY USA `�� r� <br /> P O sox 4415 �i APR 0 7 1992 <br /> HOUSTON TX 77210-4415 <br /> RE: Exxon IN REPLY REFER TO SITE CODE: 2231 <br /> 4444 Pershing Ave. <br /> Stockton, CA <br /> San Joaquin County Public Health Serivice, Environmental Health <br /> Division (PHS/EHD) has received the "Report of Quarterly Sampling <br /> and Analysis" prepared by E.A. Engineering, Science, and <br /> Technology dated November 1991. The report contains groundwater <br /> and analytical results from 9 monitoring wells (MW) and field <br /> observations from 2 MW's, which indicate the presence of gasoline <br /> hydrocarbons. Two additional MW' s were also sampled with no <br /> gasoline hydrocarbons detected above detection limits. <br /> Although MW 11 indicates no detectable gasoline hydrocarbon, the <br /> location downgradient from MW 10 (now with insufficient water to <br /> purge or sample) will not serve as a good data point to evaluate <br /> the perfomance of the proposed groundwater remediation system. <br /> In order to continue to characterize the plume and evaluate <br /> groundwater treatment, it is essential that Exxon install <br /> additional monitoring well/wells in a downgradient location. <br /> If you have any further questions regarding this matter, contact <br /> Harlen Knoll, REHS, at (209) 468-3442 . <br /> Jogi Khanna, M.D. , M.P.H. <br /> Health Officer <br /> Laurie A. Cotulla, REHS, Program Manager <br /> Environmental Health Division <br /> ri <br /> LAC/HK: lb <br /> c: E.A. Engineering Science and Technology <br /> 41 Lafayette Circle <br /> Lafayette, CA 94549 <br /> A Division of San Joaquin Counry Health rare S mce �� <br />