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ulN <br /> PUBLrC HEALTH SERVICES oQ .� <br /> SAN JOAQUIN COUNTY <br /> u0: X <br /> JOGI KHANNA M.D.,M.P.H, <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) •Stockton, California 95201 <br /> (209)468-3400 <br /> APR 1 2 1991 <br /> D <br /> CRAIG OGATA (01 <br /> COUNTY OF SAN JOAQUIN <br /> DEPT OF GOVERNMENT BUILDINGS <br /> 1722 SCOTTS AVE <br /> STOCKTON CA 95205 <br /> RE: San Joaquin County Motor Pool IN REPLY REFER TO SITE CODE: 2518 <br /> S. Della/Hazelton <br /> Stockton, CA 95205 <br /> We have reviewed the October 9, 1990 Additional Soil Assessment Report prepared by Kleinfelder for the <br /> above referenced site. Together with the information collected in the December 22, 1989 Soil Assessment <br /> Report and initial sampling results conducted at the time of excavation analyzed by Canonie Environmental <br /> and reported June 7, 1988, remediation of the soil contamination is required. Based on LUFT Manual <br /> leaching potential results,the contamination present cannot be left in place,as groundwater can potentially <br /> be impacted. The close proximity of the site to the California Water Wells #16, #23, #24, #25 of Station <br /> #1 located at 1602 E. Lafayette poses a significant potential risk to drinking water. While horizontal "zero <br /> lines" have been determined for petroleum hydrocarbons, the extent of vertical contamination in the <br /> immediate vicinity of the tank has not been determined. <br /> Contamination at the tank area occurred as evidenced by high TPH concentrations, 620ppm and 310ppm <br /> at the time of tank removal. Furthermore, it was documented at the time of removal, that the tank was <br /> corroded and could have leaked. <br /> At this time we recommend re-excavation and further sampling of the former underground tank#3 location. <br /> Excavation will be necessary to remove contaminated soil. Resampling will verify either the contamination <br /> has been removed by re-excavation or a groundwater investigation will be required. <br /> A soil remediation work plan should be submitted no Iater than June 20, 1991. <br /> If you have any questions contact Mary Meays, EHS, of my staff at (209)468-3441. <br /> Jogi Khanna D., M.P.H. <br /> Health Of' n <br /> �y 6 <br /> La ie A. Cotulla, REHS, Program Manager <br /> r <br /> vironmental Health Division <br /> LAC/MM:nr <br /> c: CVRWQCB <br /> c: Kleinfelder - Alex Richards <br /> 9795 Business Park Dr., Sacramento, CA 95827 <br /> A Division of San Joaquin County Health Carc Services �� <br />