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Scott Mansholt -2- 19 March 2003 <br /> ChevronTexaco <br /> Former Burns Property <br /> which is less`tRan`tfiei10O µg/L.ta9ite and odor water quality objective (WQO) for TPH-d. The remaining <br /> constituents of concern were less than the laboratory method detection limits for the respective chemicals <br /> tested. <br /> The HSE reports, dated 17 January 2000, and amended 20 July 2001, indicates that samples were obtained <br /> and analyzed to define the vertical and lateral of petroleum hydrocarbon affected soil and groundwater. <br /> For the purpose of the HSE, all concentrations detected for each chemical were quantitatively evaluated <br /> and the maximum detected concentration for each chemical was considered as representative. In <br /> accordance with ChevronTexaco's draft consistent technical approach (CTA) for site evaluation and <br /> decision making for OVP sites, the HSE reports were forwarded to the Department of Toxic Substances <br /> Control (DTSC) office for review and comment. <br /> The DTSC concurred with the HSE findings that the analytical data supporting the investigation <br /> "...appeared adequate in both quantity and quality." Additionally, the DTSC review memoranda, dated 27 <br /> April 2000 and 9 October 2001, stated that the "...residual levels of petroleum-related constituents in the <br /> soils at the site are below levels that would constitute an unacceptable risk to human health and the <br /> environment..." and the findings ..."meet the criteria for no further action determination." <br /> Regional Board staff concurs with the reports' findings that the lateral and vertical extent of soil impacted <br /> by petroleum hydrocarbons has been characterized. We also concur that the groundwater plume appears <br /> to be limited in extent, is stable, and meets the criteria for closure in accordance with the draft Regional <br /> Board "Low Risk Criteria", Appendix B —No Further Action Requests (1996, updated September 2001). <br /> Provided the information your consultant 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 /> If you have any questions or comments, please contact Dean Hubbard at (559) 445-5179. <br /> SHELTON R. GR Y C. DEAN HUBBARD <br /> Senior Engineering Geologist Associate Engineering Geologist <br /> RG No. 6357 <br /> cc: Ms. Peggy Wei, Regency Centers, Los Angeles <br /> Mr. Michael Infurna, San Joaquin County Environmental Health, Stockton <br /> Mr. Bryan Turner, Geomatrix, San Ramon <br /> Mr. Garrett Turner, SAIC, Oakland <br /> SLIC/E/ChevronTexacoOVP/Former Burns <br />