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PUBLk HEALTH S R;ICES <br /> SAN JOAQUIN COUNTY Q ? <br /> JOG KHANNA\1.D.•M.P.H. <br /> Health Officerf <br /> P.O. Box 2009 (1601 East Hazelton Avenue) • Stockton, California 95201 <br /> (209) 468-3400 <br /> 1 <br /> CLINT ROGERS PY: <br /> CHEVRON USAINC ((/����2410 CAMINO RAMON �E /{ JAN 0 6 1992,1 <br /> SAN 'RAMON CA 94583 \�/ ri <br /> j , <br /> RE: .. Chevron Station Site Code: 1138 <br /> 45 East Harding Way <br /> Stockton CA <br /> I <br /> San .Joaquin County Public Health Services Environmental Health <br /> Division (PHS/EHD) has completed review of'lthe "Vapor Extraction <br /> Report" dated November 26, 1991 and the "Site Update Report'' dated <br /> November 14, 1991, both prepared by EA Engineering, Science and <br /> Technology. PHS/EHD has also evaluated documents in our files for <br /> the above referenced site, and has the following comments'. , <br /> I <br /> F <br /> 1. PHS/EHD was not notified of the October 23 ,ij 1991 sampling <br /> event. Please be informed that PHS/EHDinspection of sampling <br /> events are an important aspect of local regularory oversight. <br /> Prior to any future sampling event, please contact Mary Meays, <br /> at the number below, 48 hours in advance. <br /> 2 . The PHS/EHD letter dated October 17, . 31991 requested thatila <br /> work plan to define the plume of groundwater contamination be <br /> submitted within 30 days. The work plan requested , has not <br /> been submitted to date. The additional investigation is <br /> essential to evaluate the impact to, groundwater quality. <br /> Submit a work plan for the additional soil/groundwater <br /> investigation by January 31, 1992 . <br /> 3 . The November Vapor Extraction Report iridicatedllthat the system <br /> was in operation for only one day ini November 1991. When <br /> vapor extraction began on November 16, ;1990, the daily average <br /> influent concentration was 6, 533 ppm TIPH. The current daily <br /> average influent concentration, November 20, 1991, was 205 ppm <br /> TPH. <br /> According to the March 25, 1991 Installation, Start=up and <br /> Operation of the Vapor Extraction and Treatment System; (VETS) <br /> Report prepared by EA, "After they major ° mass ' of the <br /> hydrocarbons has been removed by these .threelwells (V3, V5, <br /> and MW4) the other six wells (V1, V2, iV4, MW31, MW5, and MW6) <br /> will be used to extract vapors. " u <br /> Please provide further information regarding the use of wells, <br /> V1, V2 , V4 , MW4, MW5 and MW6, for vapor extraction purposes. <br /> „ <br /> A Division of San Joaquin County Health Care Service :� I <br /> i <br />