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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> �. ENVIRONMENTAL HEALTH DIVISION <br /> N: <br /> Karen Furst, M.D., M.P.H., Health Officers ' <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 9520 <br /> 2091468-3420 <br /> JERRY MOORE <br /> MOORE PETROLEUM <br /> P o Box 67 JUL 12 1999 <br /> BANTA CA 95340 <br /> RE: Moore Petroleum SITE CODE: 1502 <br /> 5491 "F" Street <br /> Banta, CA <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed the "Results Report For Subsurface Investigation And <br /> Second Quarter 1999 Groundwater Monitoring Report " dated June 1, 1999 <br /> prepared by Apex Envirotech, Inc. for the above referenced site. <br /> The analytical results of the soil samples obtained from GP5 at 10 and 15 feet <br /> below surface grade (bsg) evidenced MTBE. The Pit 3 grab water sample <br /> collected when the underground storage tanks (UST's) were removed had <br /> 11,000 parts per billion (ppb) MTBE in it. In order to define the vertical extent of <br /> the contamination in this area, soil samples must be collected below 15 feet from <br /> surface grade. <br /> Soil and groundwater samples submitted to the laboratory from this phase of <br /> investigation were not analyzed for the five oxygenates (DIPS, MTBE, TAME, <br /> TBA, ETBE) using EPA Method 8260 as directed in the PHS/EHD letter dated <br /> February 1, 1999. Future samples submitted for laboratory analysis must be <br /> tested for these oxygenates using EPA Method 8260. <br /> Quality assurance/quality control data from the laboratory for the samples <br /> analyzed from the geoprobe work and the monitoring well water samples was not <br /> included in the report. In addition, the chain of custody for the monitoring well <br /> water samples was not included in the report. Please submit this information as <br /> an addendum to the report. <br /> The report recommends abandoning monitoring wells MW2, MW5, and MW6. <br /> No monitoring wells should be destroyed at this time. MW6 has not been located <br /> since April 1998 and must be located and sampled during the next quarterly <br /> sampling event. <br /> A Division of San Joaquin County Health Care Services <br />