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PUBLII. HEALTH SER VICESOP4U IN. ..Q <br /> SAN JOAQUIN COUNTY ' iO� <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto , M.D . , M.P .H. , Acting Health Officer <br /> 445 N . San Joaquin Street • P. O. Box 388 • Stockton, CA 95201-0388 <br /> F0 <br /> 209/468,&3420 P <br /> 209/468-3420 co � � - <br /> ROGER LISTON <br /> 3450 EL CAMINO MAP J 6 E99n <br /> CERES CA 95307 <br /> RE: Omen Service Station SITE CODE: 1060 <br /> 749 East Charter Way <br /> Stockton, CA 95206 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed the March 15, 1995 <br /> Workplan prepared by California Geophysical Group for the above referenced site. <br /> PHS/EHD has the following comments regarding this workplan: <br /> 1 . Detection Limits for water analyses using EPA Method 602 shall be .3 ppb for Benzene, Toluene, and Ethyl <br /> Benzene. <br /> 2. Cement or bentonite grout will be placed in the annulus of a monitoring well by the use or a tremie pipe if <br /> the total annulus seal distance is greater than 15 feet as stated in the Well Standards for Monitoring Wells in <br /> the San Joaquin County Development Title. <br /> 3 . The workplan indicates the procedure by which core samples will be chosen for analysis. Additional core <br /> samples chosen for analysis may be determined in the field based upon conditions encountered during drilling <br /> and hydropunching. <br /> 4. The depth to groundwater will be measured from a survey point which will be marked on the top of the <br /> casing. Measurements must be taken from casings that have been surveyed by a California licensed surveyor. <br /> 5. Wells and borings shall be abandoned using a cement bentonite slurry placed by tremie from bottom to top <br /> after the casing has been overdrilled as stated in the Well Standards for Monitoring Wells in the San Joaquin <br /> County Development Title. <br /> The workplan appears to address remediation of soil contamination and investigation of the extent of the groundwater plume. <br /> Vapor Well installation should be delayed until the soil analysis from 13-2 and BM-12 are assessed. <br /> For further information please contact Steven Sasson at (209) 468-3459. <br /> Donna Hemn, REHS, Director <br /> Environmental Health DDiiivv`iisiioon��� I` 'y n�' '(^'I'•/ <br /> /evoenKassenior IZE YFYS Diane M. Hmsan REHS <br /> Site Mitigation Unit Supervisor <br /> SS:Ib <br /> cc: CVRWQCB - Elizabeth Thayer <br /> cc: Claifomia Geophysical Group, Inc. - John Cussen <br /> A Division of San Joaquin County Health Care Services <br />