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PUBLIC r1EALTH SERVICES <br /> O V N <br /> SAN JOAQUIN COUNTY )0.. <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer •` <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 9 coq•.;FOR��� <br /> 209/468-3420 1 <br /> BRETT HUNTER JUL 111%7 <br /> CHEVRON USA INC <br /> P O BOX 6004 <br /> SAN RAMON CA 94583-0904 <br /> RE: Chevron Service Station #9-6171 SITE CODE: 1784 <br /> 6633 Pacific Ave <br /> Stockton CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> completed review of your correspondence dated June 12, 1997 and the Gettler-Ryan "First <br /> Quarter Groundwater and Sampling Report" dated March 31, 1997. PHS/EHD has prepared <br /> the following comments for your response. <br /> History <br /> PHS/EHD in correspondence dated December 23, 1994, requested that a corrective action plan <br /> be submitted by March 31, 1995. PHS/EHD reviewed the "Corrective Action Plan" (CAP) <br /> dated April 4, 1995 and commented in correspondence dated April 12, 1995 that the CAP failed <br /> to comply with the Underground Storage Tank Regulations and requested the submittal of a <br /> revision that included clarification regarding cleanup goals and remedial objectives. <br /> A "CAP Revision" dated June 29, 1995 was submitted which proposed an additional monitoring <br /> well south of MW2 and additional soil borings in the area of the pump island. The CAP revision <br /> proposed long term monitoring as the selected remedial alternative. The additional borings <br /> were proposed to investigate the possible source of the contamination that was evidenced in <br /> MW2. MW2 is located downgradient from the pump islands and during the initial investigation <br /> had not detected petroleum hydrocarbons in the groundwater samples collected. The <br /> additional well was proposed in a location which is occupied by a building, so the well was not <br /> installed. <br /> In September 1995 the additional borings were drilled and the report of the investigation was <br /> submitted April 4, 1996. PHS/EHD's comments on the soil investigation report were included in <br /> correspondence dated April 11, 1996 in which PHS/EHD stated, that since a piping upgrade <br /> was planned in the near future and since the source of the groundwater contamination has not <br /> been clearly identified, that a more focused remediation methodology was impossible and that <br /> intrinsic bioremediation may likely be the most cost effective remedial alternative. PHS/EHD <br /> stated that at the time of piping upgrade, it will be possible to obtain additional information <br /> regarding the former piping. PHS/EHD requested the submittal of an addendum to the CAP <br /> revision, that includes a list of the parameters that would be used to monitor the effectiveness <br /> of bioremediation. PHS/EHD also noted that there were not any land use restrictions that could <br /> be institutionally placed on the property. <br /> The "CAP Addendum" dated July 17, 1997 included a proposal to perform the supplemental <br /> quarterly sampling analysis to demonstrate that bioremediation was ongoing. <br /> A Division of San Joaquin County Health Care Services <br />