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A <br /> THSERVi'ESPUBLICEAL <br /> SAN JOAQUIN COUNT r. <br /> ENVIRONMENTAL HEALTH DWISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> t'p Rte. <br /> 445 N. San Joaquin Street • P.O. Box 388 • St kton, CA 95201-038$ Fp <br /> (209) 468-3420 <br /> o � <br /> UNOCAL CORPORATION <br /> 2000 CROW CANYON PL STE 400 <br /> P O BOX 5155 JUN 0 2 1994 <br /> SAN RAMON CA 94583 <br /> RE: 601 E. Kettleman Lane (Station #6015) SITE CODE: 1348 <br /> Lodi, CA <br /> On March 9, 1994 Unocal Corporation and Kaprealian En ' eering Incorporated (KEI) presented a site <br /> investigation summary to the Central Valley Regional Water Quality Control Board and the San Joaquin <br /> County Public Health Services Environmental Health Division (PHS/EHD) Technical Review Committee <br /> (TRC). Both soil and groundwater at the site have been impacted by an unauthorized release of petroleum <br /> hydrocarbons (gasoline). <br /> A Vadose Zone Contaminated Fate and Transport Model ESOIL) was performed by KEI using data <br /> collected from site investigation activities. A residual Benzene concentration of 0.57 ppm discovered in an <br /> overexcavation at 26 feet and water level of 72 feet were three of the inputs used to determine contaminant <br /> migration. <br /> In order to make the model accurate, the TRC recom nds the Benzene concentration, depth of <br /> contamination, and depth to water inputs be revised: the Be=ene concentration (19 ppm) found in MWI, <br /> its depth (32.5 feet), and highest groundwater in the past ten ears (50 feet in 1986) should be utilized. <br /> When these inputs changes are made and results are made ava lable to the TRC for review,your request for <br /> soil closure will be reconsidered. <br /> If you have any further questions regarding this matter, contact Harlin Knoll at (209) 468-3442- <br /> Donna Heran,REHS, Director <br /> Environmental Health Division <br /> Harlin Knoll, Senior REHS Diane M. Hmson, REHS <br /> Site Mitigation Unit Supervisor <br /> HK.1b <br /> c: CVRWQCB <br /> c: Kaprealian Engineering, Inc. <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> A Division of San Joaquin County Health Care Services <br />