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FROM UNOCAL. CERT-NORTH 22 ,a 4 13 08 <br />� <br /> PUBLIC HEALTH SERVICES � i~ <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION » �, <br /> Ernest M. FuJimoto, M.D., M.P.H., Acting Health Officer <br /> 449 N. San Joaquin Street P. O. Box 388 • Stockton, CA 93201-0388 Id(60 � <br /> 209/469-3420 <br />' EDWARD RALSTON I iE!D <br /> UNOCAL CORPORATION aek., <br />' P O BOX 5155 �� 57C 2 R ��5� <br /> SAN RAMON CA 94583 L V- �� ' <br /> RE UNION OIL SS#6348 <br />' 3788 Tracy Blvd <br /> Tracy, CA 95376 <br />' The Unocal Corporation and Matelhauser Corporation met with the San Joaquin County Public Health <br /> Services/Environmental Health Division (PHS/EHD) Technical Review Committee (TRC) December 14, 1994. <br /> Mittelhauser summarized the site assessment and site remediation activities relating to petroleum hydrocarbon <br />' contamination releases which impacted both soil and groundwater at this site. <br /> The TRC has reviewed the analytical results obtained from soil and groundwater samples and has determined that <br /> further assessment of areas with documented residual contamination needs to be conducted before this site can be <br />' considered for closure <br /> Further soil characterization of areas north, east, and south of the former tank field is required Residual soil <br /> 6 contamination of concern exists in the area of sample PL-7, SW-7, and SW-11 Sample PL-7 contained elevated <br /> gasoline constituents and the current vertical extent must be characterized Sample SW-7 contained detectable levels <br /> of oil and grease but was not analyzed for chlorinated hydrocarbons which were discovered in soil samples collected <br />' at the time of the waste oil tank removal Sample SW-I 1 indicated the presence of gasoline and further delineation <br /> of residual contamination of the eastern wall of the excavation needs to be addressed. <br /> Groundwater contamination in MW-3 was noted in several samples prior to its destruction during overexcavation. <br />' A petroleum like substance was observed floating on the groundwater in the final excavation and the pit was <br /> dewatered but no sampling of the groundwater occurred after recharge 7be current groundwater conditions in the <br /> backfilled area and east of soil sample SW-11 needed to be evaluated <br />' if you have any questions or need clanfication regarding the TRC's concerns contact Harlin Knoll at <br /> (249)468-3442 <br />' Donna Heran, REHS, Director <br /> Environmental Health Division <br />' Harlin Knoll, Senior REHS je, Diane <br /> Site Mitigation Unit M. inion, REH <br /> Supervisor <br />' HK-Ib <br />' cc SWRCB, Lori Casras cc Mix. Kothieen Gayner Deutsch <br /> cc CVRWQCB, Elizabeth Thayer 13655 Dunbar Road <br /> Dundee, MI 48131 <br />' A Division of San JoaQuin County Health Care Services <br />