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California F,_jional Water Quality Cor&l Board �- ><� <br /> Central Valley Region �� <br /> -� <br /> Katherine Hart, Chair °��:�«�' <br /> Linda S. Adams Arnold <br /> Secretary for 1685E Street,Fresno,California 06 Schwarzenegger <br /> Environmental (559)445-5116• Fax(559)445-5915910 <br /> http://www.waterboards,ca.gov/centralvalley Governor <br /> 1-01 Protection <br /> 8 June 2010 ENVIRONNIIENT HEALTH <br /> PERMIT/SERVICES <br /> Lee Higgins <br /> Chevron Environmental Management Company <br /> 6111 Bollinger Canyon Road <br /> BR 1 Y/3484 <br /> San Ramon, CA 94583 <br /> NO FURTHER ACTION REQUIRED DETERMINATION, VERNALIS OFFSITE, VERNALIS, <br /> SAN JOAQUIN AND STANISLAUS COUNTIES <br /> Chevron Environmental Management Company (Chevron) submitted a request for No Further <br /> Action Required (NFAR) determination for the Vernalis Offsite project site (Site). The NFAR, <br /> dated 14 August 2009, was prepared by Science Applications International Corporation (SAIC) <br /> on behalf of Chevron. The Site is near the rural unincorporated community of Vernalis, east of <br /> the intersection of California State Highway 33 and Welty Road. <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br /> reviewed the NFAR documentation and project files. Detailed comments are contained in the <br /> enclosed memorandum. In a July 2008 letter, Central Valley Water Board staff concurred that <br /> soil and groundwater affected by crude oil leaks from Chevron's adjacent historical Old Valley <br /> Pipeline (OVP) and/or the former Vernalis pump station facility has been delineated and <br /> additional characterization was not needed. The former OVP and pump station facility are <br /> being addressed separately by Chevron with regulatory oversight provided by Central Valley <br /> Water Board staff. <br /> Results of the Site investigative findings indicate that crude oil affected groundwater is limited <br /> in extent to an area near the approximate location of the former groundwater monitoring wells. <br /> According to SAIC's investigative findings, crude oil affected soil was not observed. The <br /> groundwater monitoring wells were properly destroyed in August 2008. <br /> According to SAIC's investigative findings, residual concentrations of crude oil constituents will <br /> naturally degrade with time and are not present at concentrations that would pose an <br /> unacceptable health risk for a residential scenario setting or to any ecological receptor. <br /> Review of the project files indicates the anticipated use of the Site will remain as agricultural <br /> and that other development of the Site is unlikely. <br /> California Environmental Protection Agency <br /> 4'aRecycled Paper <br />