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STATE OF CALIFORNIA GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION ..,� <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 <br /> 25 May 1989 MAY v 0 198917 <br /> 1 <br /> Ms. Diane Hinson <br /> San Joaquin Local Health District <br /> P. 0. Box 2009 <br /> Stockton, CA <br /> REVIEW OF 15 MARCH 1989 QUARTERLY GROUND WATER MONITORING REPORT FOR BEACON <br /> OIL, 470 NORTH MAIN STREET, MANTECA, SAN JOAQUIN COUNTY <br /> We have reviewed the 15 March 1989 Quarterly Ground Water Monitoring Report, <br /> as well as the case file for this site, and have the following general <br /> comments: <br /> 1. Quarterly(?) monitoring has been conducted on the three monitoring wells <br /> at this site since December 1986. The regularity of the sampling is not <br /> stated. Benzene levels have exceeded state action levels in MW-1 and <br /> MW-2 on every sampling event. <br /> 2. The extent of ground water contamination has not been defined at this <br /> site. Further investigative work will be necessary before a complete <br /> Problem Assessment Report (PAR) can be submitted. <br /> 3. A work plan for PAR investigative work needs to be submitted. <br /> 4. The reports lack some of the specific information recommended in <br /> Appendix A of the Tri -Regional Recommendations (outlined on pages <br /> A-8 and A-9) . For example, a well survey and a site map showing the <br /> product pipeline layout and other underground utilities are needed. <br /> This information could be included in the PAR work plan or the completed <br /> PAR. <br /> 5. The soil samples collected from the installation of the three monitoring <br /> wells and four vapor recovery wells were not analyzed for total <br /> petroleum hydrocarbons (TPH) . They were analyzed for total volatile <br /> hydrocarbons (TVH) using EPA method 8020 which is limited to the <br /> aromatic constituents. All soil samples collected and submitted to the <br /> laboratory during the further investigative work should be analyzed for <br /> TPH as gasoline and diesel using appropriate analytical methods as <br /> outlined in Table 2 of the Tri-Regional Recommendations. <br /> I spoke to John Bobbitt of Applied GeoSystems on 11 May 1989. He <br /> explained that the TVH analysis were conducted before the Tri -Regional <br /> Recommendations were available and that they now analyze all samples for <br /> TPH. <br />