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PUBLP HEALTH SERVICES <br /> G <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.D..M.P.H. <br /> Health Officer �P <br /> P.O.Box 2009 (1601 East Hazelton Avenue) • Stockton, California 95201 QFi 6_0i <br /> (209)468-3400 <br /> r <br /> STEPHEN POA <br /> MOBIL OIL CORPORATION <br /> 3800 WEST ALAMEDA AVE SUITE 2000 APR <br /> BURBANK CA 91505-4331 <br /> RE: Former Mobil Bulk Plant SITE CODE: 1968 <br /> 500 East Grant Line Road <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD)has <br /> reviewed the "Risk Assessment Work Plan" dated March 23, 1993 and prepared by Alton <br /> Geoscience. PHS/EHD has prepared the following comments for your consideration. <br /> PHS/EHD reviewed the work plan for the installation of three additional monitoring wells, <br /> AW10, AW11, and AW12, to further assess groundwater contamination and to be used for <br /> the purpose of aquifer testing. PHS/EHD issued a drilling permit, #93-0476, for field work <br /> which commenced on March 25, 1993. Subsequently on April 2, 1993 quarterly monitoring <br /> of all wells occurred. <br /> The work plan indicated that a risk assessment report, utilizing health risk assessment <br /> methodology, would be submitted by June 30, 1993. Risk assessments are performed <br /> routinely by PHS/EHD to evaluate soil contamination and possible threats to groundwater <br /> quality which contamination may pose. Therefore, since groundwater quality has already <br /> been impacted, risk assessments based on health based methodology have limited <br /> application. <br /> The State of California has mandated that as a limited and precious resource, all waters of <br /> the state be protected and restored to original quality if polluted. This is firmly mandated <br /> in the Porter-Cologne Water Quality Act, in the State of California's Antidegradation Policy <br /> and Sources of Drinking Water Policy and in the State's Water Quality Basin Plans <br /> establishing the present and potential beneficial uses of waters of the state. All groundwater <br /> in San Joaquin County is designated by the California Regional Water Quality Control <br /> Board in the Basin Plan to have beneficial or potentially beneficial use. <br /> A Division of San Joaquin County Health rarc Semees <br />