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PUBLItHEALTH 4�. ,.N.. <br /> ..C <br /> SAN JOAQUIN COUNTY 59 <br /> F: 'Oc <br /> r.� <br /> ENVIRONMENTAL HEALTH DIVISION Z� <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street • P. O. Boz 388 • Stockton, CA 95201-0388 �1Foa <br /> 209/468-3420 <br /> GEORGE BRAVANTE C Py <br /> 320 STONE RIDGE LANE WED JUN 2 21995 <br /> ANGWIN CA 94580 <br /> RE: Bridges Specialty Center SITE CODE: 505361 <br /> 2233 Grand Canal Boulevard <br /> Irvine CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed the "Soil <br /> Excavation Report and Groundwater Investigation" dated January 19, 1995 and the June 8, 1995 letter prepared by <br /> CRC Environmental Risk Management, Inc. for the above referenced site. <br /> PHS/EHD has determined that the overexcavation resulted in the presence of a small amount of residual <br /> contamination at the site. The vertical extent of the residual contamination does not exceed 20 feet based upon <br /> analytical results of SB8E, SB10A and SB15B. The lateral extent of the contamination can be estimated using a <br /> concentration gradient based on analytical results of SB7 SB6, SB4, SB2, SB3, SB8 and SB5. The mass balance <br /> of the residual contamination can be calculated using the estimate of the lateral extent and the defined vertical extent <br /> of the residual contamination. The mass balance calculation should compensate for the removal of 2000 gallons <br /> of contaminated sludge which was flowing into the excavation as the samples were being obtained,in order to obtain <br /> a more accurate representation of the residual contamination. <br /> Three monitoring well were installed during the investigation. Two wells were placed in an upgradient position and <br /> one well was placed in a downgradient position. Samples were obtained from these wells one time and were <br /> analyzed for hydraulic oil. The analytical results of the samples were ND for hydraulic oil. <br /> In order to obtain site closure a mass balance calculation and risk assessment of the residual contamination should <br /> be performed and confirmation groundwater samples from the three wells should be analyzed for hydraulic oil for <br /> three additional quarters. <br /> For further information, please contact Steven Sasson at (209) 468-3459. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> ;tien arson, enior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> SS <br /> cc: Wendy Cohen, RWQCB non-tank section cc: Trevor Santochi <br /> cc: Kevin Howat CRC Environmental <br /> 600 East Las Colinas Boulevard, Suite 400 17875 Von Karman, Suite 200 <br /> Irving, TX 75039 Irvine, CA 92714 <br /> A Division of San Joaquin County Health Care Services <br />