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M. Scott Mansholt �"'� - 3 - '"W" 8 March 2005 <br /> . ChevronTexaco <br /> Pombo Property <br /> obtained from several locations where access was available. TPH-d ranged from ND at two downgradient <br /> locations to 86 gg/L to 370 gg/L; BTEX compounds were not detected. Phenanthrene at 0.4 µg/L was the <br /> only PAH detected. <br /> A well survey for domestic, irrigation, or municipal supply wells within two thousand feet of the project <br /> revealed that nine private wells were identified; six were identified as domestic supply; one was listed as <br /> an industrial supply well, and two were listed as unknown. Four are located between 400 and 2,000 feet <br /> upgradient; four are crossgradient, and the industrial well is downgradient and the location is not <br /> specified. Review of Department of Water Resources well completion records indicate that with one <br /> exception, the wells were completed with greater than 50-foot sanitary surface seals. A well, <br /> approximately 1,500 feet crossgradient, has a listed seal of 12 feet. Three crossgradient wells have <br /> unspecified seal depths. These surface seals extend below the shallow groundwater that occurs at this <br /> site. Considering the depths of the sanitary seals coupled with the distance from the project site, <br /> dissolved petroleum constituents likely will not affect these water supply wells. <br /> Regional Board staff concurs that the lateral and vertical extent of soil impacted by petroleum <br /> hydrocarbons has been adequately characterized. We also concur that the groundwater plume has been <br /> adequately delineated off-site(downgradient), appears to be limited in extent, is stable, and meets the <br /> criteria for closure in accordance with the draft Regional Board"Low Risk Criteria", Appendix B—No <br /> Further Action Requests (1996, updated September 2001). <br /> Provided the information your consultant(s) submitted was accurate and representative,no further action is <br /> needed at the above-referenced property. Nothing in this determination is intended or shall be construed to <br /> limit or preclude the Regional Board or any other agency from taking any further action if new information <br /> related to the OVP reveals that additional assessment is warranted. <br /> By 15 June 2005,please submit a No Further Action request for the Pombo property, including technical <br /> information, maps, etc., in support of the site closure request. Additionally, as suggested by DTSC, <br /> include documentation that a non-residential deed restriction has been properly recorded for the site. <br /> If you have any questions or comments,please contact Dean Hubbard at (559) 445-5179. <br /> SHELTON R. GRAY — C. DEAN HUBBARD <br /> Senior Engineering Geologist Engineering Geologist <br /> RG No. 6357 <br /> cc: Mike Pfister,DTSC, Clovis <br /> Michael Infurna, San Joaquin County EHD, Stockton <br /> Luis Mercado, SAIL, Sacramento <br /> SL[C/E/ChevronTexacoOVP/Fonzner Pombo <br />