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• K <br /> PUBLIC HEALTH SERVICES <br /> U IA, <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) •Stockton,California 95201 �,�J0dAt <br /> (209) 468-3400 <br /> PENNY SILZER <br /> UNOCAL <br /> 2000 CROW CANYON PLACE #400 � = <br /> SAN RAMON CA 94583-1367 MAY 2 5 1993 <br /> Re: Unocal Bulk #0788 SITE CODE: 1597 <br /> 8203 West Eleventh Street <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has completed review of the following submittals prepared by Pacific Environmental <br /> Group (PEG) and GeoStrategies (GS): <br /> "Remedial Action Plan" dated March 18, 1993 and prepared by PEG; <br /> "Quarterly Monitoring Report" dated March 23, 1993 and prepared by GS; <br /> First Quarter 1993 Summary Report" dated April 13, 1993 and prepared by PEG; <br /> Pacific Environmental correspondence dated April 22, 1993; and <br /> Pacific Environmental correspondence dated April 27, 1993. <br /> PHS/EHD has the following comments for your consideration. <br /> SOIL AND GROUNDWATER CHARACTERIZATION <br /> PHS/EHD agrees that the boundaries of soil contamination have been established to the <br /> west and east of the site. Monitoring wells, U9 and U10 have delineated the extent of <br /> soil and groundwater contamination to the west of the site. Monitoring wells, U3, U4, <br /> and U7, have delineated the extent of soil and groundwater contamination to the east of <br /> the site. <br /> Additional soil and groundwater investigation will be necessary to the south and north of <br /> the site. The analytical results from soil boring UA indicated that the contamination <br /> likely extends beneath the warehouse. Soil and groundwater analytical results from <br /> monitoring wells, U6 and U8, indicated that the soil and groundwater contamination <br /> likely extends off-site to the north. <br /> Analytical results indicated that petroleum hydrocarbon contamination heavier than TPH- <br /> diesel has been detected. Please consider analyzing samples using EPA Method 8015M <br /> for TPH-gasoline, TPH-diesel and TPH-motor oil with standards run for gasoline, diesel, <br /> transmission oil, and motor oil. <br /> A Division of San Joaquin County Health f:aR 5uv m <br />