Laserfiche WebLink
i <br /> r' <br /> j Chevron U.S.A. - Page 2 <br /> E <br /> pv, In response to the contamination noted in subsoils at the time of the tank <br /> i . <br /> removals in mid-1988, Chevron requested that Dames & Moore prepared u remedial <br /> action plan for snbsoii contamination at the subject property. Discussions with <br /> Mr, Gordon Boggs of the California Regional (later Quality Control Board (RWQ,CB) <br /> at that time, thc- RWQCB was not as concerned with low <br /> yielded information that <br /> levels of contamination detected in monitoring wells at the subject property, and <br /> that remediation of the zubsoil contamination noted from the underground tank <br /> removals at the subject property was a propitious choice. <br /> At Chevron's request, letter dated October d, 1988 was prepared by Dames & <br /> ion remedial plan proposed and developed by <br /> Moore detailing a sail vapor extract <br /> - Dames & Moore. The October A, 1988 letter was submitted to Gordon Boggs of the <br /> Regional Water Quality Control Board for review. The letter generally addressed <br /> a two-phase <br /> for the implementation of a soil vapor extraction system, <br /> ^ permitting, and monitoring of system performance. <br /> f <br /> F The first phase addressed contamination of subsoils in the tank backfill, <br /> waste oil tank removal and product line areas of the subject property which were <br /> observed to exhibit subsoils contamination, and were previously accessible for <br /> subsurface soil vapor extraction system hardware installation. the accessibility <br /> component of the first phase represented an opportunity to install a system which <br /> extensive excavation, and therefore <br /> would otherwise require afforded a <br /> considerable cost savings. <br /> The design concept employed Was developed to take advantage of the <br /> gasoline's volatilizing vapors density being heavier than air. The volatiles are <br /> DAMU, htcx�[t <br />