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' Soil and Groundwater Investigation Report <br /> Vernalis Offsite June 2008 <br /> ' groundwater screening tools);consequently, it is recommended that no additional investigation be <br /> conducted to obtain concentrations below the ESLs. <br /> • A HHRA is recommended as a next step to move the site toward NFAR status. <br /> • SAIC recommends the groundwater monitoring and sampling frequency conducted for off-site <br /> wells MW-6 and MW-7 be reduced to coincide with the semi-annual schedule for the on-site <br /> Vernalis Pump Station wells. <br /> ' 7. REFERENCES <br /> ' EPA, 2004. Region 9 PRGs Table. hLtp://www.epa.gov/region9/waste/sfunftrg/index.htn-dftrglable. <br /> October. <br /> Geological Technics, Inc., 1995. Preliminary Environmental Site Assessment: Vernalis Property, 35500 <br /> ' Welty Road, Vernalis, California. February. <br /> Geomatrix, 1999. Site Investigation Report and Screening-Level Health Risk Assessment. February. <br /> , 2002. Report of Soil and Groundwater Investigation, Former Vernalis Pump Station, Vernalis, <br /> California. August. <br /> , 2004. Report of Soil and Groundwater Investigations, Former Vernalis Pump Station, Vernalis, <br /> California. January. <br /> 2005. Technical Approach to Site Evaluation and Decision Making, Historical Pipeline <br /> Portfolio, Central Valley Region(CTA). February. <br /> ' Radian, 1998. Preliminary Site Investigation Work Plan:Roberts Property. July. <br /> RWQCB, (Central Valley), 2004. Beneficial Use-Protective Water Quality Limits for Components of <br /> Petroleum-Based Fuel. April. <br /> 2006. Review—Soil and Groundwater Investigation Report— Vernalis Pump Station, 35500 <br /> Welty Road, Vernalis, San Joaquin and Stanislaus Counties. September. <br /> RWQCB, (San Francisco Bay), 2007. Screening for Environmental Concerns at Sites with Contaminated <br /> Soil and Groundwater(Interim Final). November. <br /> SAIC, 2006. Soil and Groundwater Investigation Report, Vernalis Pump Station, Vernalis, California. <br /> ' August. <br /> 2007. Soil and Groundwater Investigation Work Plan, Vernalis Offsite, Vernalis, California. <br /> April. <br /> 2008. First 2008 Semi-Annual Groundwater Monitoring and Sampling Report, Vernalis Pump <br /> Station, 35500 Welty Road, Vernalis, California. April 28. <br /> 8 <br /> WAV:am <br /> MMN/rU`® <br /> From Science to Solutions <br />