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1 <br /> URS <br /> Mr Harlin Knoll Page 7 <br /> San Joaquin County Environmental Health Department <br /> ARCO 2093 <br /> February 24, 2005 <br /> • Existing MtBE and benzene concentrations in site wells are below the maximum contaminant <br /> levels <br /> Based on the review of historical soil and groundwater investigations, URS requests that ARCO Station <br /> No 2093 be considered "low risk" and recommends closure and No Further Action A checklist of data <br /> required by the RWQCB Central Valley Region for no further action at UST sites is presented as <br /> Attachment L <br /> This document is based on data, site conditions, and other information that are generally applicable as of <br /> the date of the document The conclusions and recommendations herein are therefore applicable only to <br /> that time frame <br /> If you have any questions or continents regarding this letter, please call Mr Vernon Elarth at <br /> (916) 679-2299 <br /> Sincerely, <br /> URS Corporation erica ctD GEO4�G' <br /> �pAf1C £� i�, <br /> No 20� � <br /> Michael Hall Vernon Elarth, R I;xp <br /> Staff Geologist Project Manager <br /> Enclosures LP OF CRL�F��� <br /> Table 1 Groundwater Elevation and Analytical Data <br /> Table 2 Fuel Oxygenates Analytical Data <br /> Table 3 Groundwater Gradient Data <br /> Table 4 Well Survey Results <br /> Figure I Site Map with Nearby Well Locations <br /> Figure 2 Site Map Showing Groundwater Analytical Data <br /> Attachment A Historic Geologic Cross-Sections and Soil Boring Logs <br /> Attachment B 1986 Initial Investigation Data <br />' Attachment C 1987 Problem Assessment Report Data <br /> Attachment D 1989 Site Investigation Data <br /> Attachment E 1990 Supplemental Site Investigation Data <br /> Attachment F 1993 UST Removal Data <br /> Attachment G 2003 Vertical Flow Assessment <br /> Attachment H 2004 Trend Analysis <br /> Attachment I Remediation System Design Drawings <br /> 10 <br /> K 1WprocessV5 SP ARCO\020931CIosure ReportlDraft of 2093 Closure Report doc <br />