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PUBIC HEALTH SERVICES <br /> SAN JOAQI,IN COUNTY Q; <br /> JOGI KHANNA M.D.,M.P H. <br /> Health Officer <br /> r . <br /> 4 <br /> P.O. Box 2009 0 (1601 East Hazelton Avenue) 0 Stockton, California 95201 GiFpty <br /> (209)468.3400 <br /> TIM HOWARD <br /> UNOCAL CORPORATION <br /> 2000 CROW CANYON PLACE STE 400 <br /> SAN RAMONE CA 94583 <br /> RE: 437 lw Miner Ave. SITE CODE 1181 <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed the <br /> "Exploratory Soil Boring Report" submitted by GeoStrategies Inc. dated 12/15/93, and has the following <br /> comments: <br /> San Joaquin County flood control maps for August 1986 indicate that the seasonal high <br /> depth to groundwater at this site was 30 feet. <br /> -A groundwater investigation will be required due to the fact that soil contamination (U-C <br /> and U-D) has been documented below 30 feet. <br /> -The vertical and the horizontal extent of soil contamination has not yet been defined. <br /> WYE` <br /> -Cadmium,.chromium,lead,and nickel need further investigation in the U-A area by utilizing <br /> the Waste Extraction Test (WET), using deionized water. <br /> -Please submit a workplan to PHS/EHD by March 10, 1994 which shall include a groundwater <br /> investigation of at least 3 monitoring wells (soil should be sampled every 5 feet in order to <br /> determine the extent of vertical and horizontal contamination) and borings in the U-A and <br /> U-E areas to investigate the above mentioned metals. t� j1Pd�s/moo <br /> If there are any questions, please contact Michael Collins, REHS, of my staff, at (209)-468-0338. <br /> -�tpLle✓' q JG57` <br /> Jogi Khanna, M.D., M.P.H. <br /> ealth Offi r <br /> Donna Heran, REHS, Program Manager <br /> Environmental Health Division <br /> DH/MC d/ ✓ <br /> c: Geostrategies Inc. c: Unit IIIA <br /> A Div=M of Sao Joaquin Cowry HWth Care Snvi <br />