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Considering the information available, I don't feel an investigation at the pump island and tank pit <br /> areas is appropriate at this time. There are several reasons supporting this opinion. The first is that <br /> the spill containment boxes were replaced during recent maintenance work in December, 1993. If <br /> undetected leaks were occurring at these locations, the replacement of the boxes would most likely <br /> prevent further leakage and remediate groundwater contamination. The second reason in support of <br /> no further investigation is that there is a more significant groundwater problem beneath the subject <br /> site that has been caused by solvent releases from several drycleaning businesses in the vicinity. <br /> Considering that some form of soil and/or groundwater remediation will take place at the subject <br /> site to remediate the solvent contamination, it would make sense to allow those efforts to proceed, <br /> evaluate their effect on petroleum hydrocarbon contamination, and proceed with further <br /> investigation if no positive effects are recognized. The third reason for not doing further <br /> investigation at this time is the inherent safety hazard and inconvenience associated with drilling at <br /> an operating station. The primary hazard would be that caused by drilling in the close proximity to <br /> active fuel tanks and lines. The inconvenience caused by further investigation would be the <br /> interruption of sales revenue to the dealer as a drill rig positioned to investigate the UST complex <br /> or pump islands would surely impede traffic now through the pumps. <br /> Therefore, the recommendation being made is to postpone further investigation at this time. <br /> Instead, continue to monitor groundwater for a period of time when remediation effects caused by <br /> either, the spill containment box repair or the solvent remediation system can be evaluated. If no <br /> positive effects of remediation are recognized, then further investigation should proceed at the first <br /> convenient opportunity (i.e., during extended station repair work). <br /> In regards to the comment that the currently operating storage tanks are out of compliance with <br /> UST Regulations, California Code of Regulations Title 23, Chapter 16, I am providing the <br /> following information. All four currently operating underground storage tanks are of double-wall <br /> fiberglass construction and were installed in 1986. Presently, there are three 10,000 gallon fuel <br /> tanks and one 1,000 gallon waste oil tank in operation. The product piping in place is single-wall <br /> fiberglass without secondary containment. The fuel UST's have been equipped with Stiles <br /> mechanical tank level monitors. The waste oil tank was recently (5/94) equipped with an interstitial <br /> tank monitoring device. The product piping undergoes precision testing annually. During the latest <br /> test in August, 1993 the piping passed as tight. Hopefully, these information are sufficient to <br /> demonstrate our compliance with all UST Regulations. <br /> If you have any questions or comments, I can be reached at(510) 842-8695. <br /> Sincerely, <br /> /J ,Z/C;--4J -,��' � <br /> Brett L. Hunter <br /> Environmental Engineer <br /> Site Assessment and Remediation <br />