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Monitoring Well Destruction and Soil and Groundwater Investigation Report <br /> US Can—Welty Road December 28,2010 <br /> • The lateral extent of affected groundwater northwest of the US Can property has not been <br /> delineated. This area will be investigated further as part of the adjacent Ahern Road— <br /> Vernalis site. <br /> SAIC-Benham recommends the following: <br /> • Conducting additional research to establish the locations or other available information <br /> for the two wells identified during the DWR search that did not have sufficient location <br /> information. <br /> • Sampling selected water supply wells identified in close proximity to areas where <br /> groundwater concentrations exceeds ESLs and WQOs (contingent on obtaining access). <br /> SAIC-Benham will prepare a brief workplan outlining the results of the research and <br /> wells proposed for sampling. <br /> • Preparation and submittal of a human health screening evaluation as the next step in the <br /> process of moving the site toward no further action required status. <br /> 7. REFERENCES <br /> Barclays Official California Code of Regulations, Title 22, Division 4(last updated 7/25/08). <br /> CDPH, 2010. California Regulations Related to Drinking Water. <br /> http://www.cdph.ca.gov/certlic/drinkingwater/Documents/Lawbook/dwregulations-06- <br /> 24-2010.pdf June. <br /> DWR, 2003. California's Groundwater, Bulletin 118, 2003 Update. <br /> EPA, 2008. Region 9 Preliminary Remediation Goals Regional Screening Level Table. <br /> bM://www.epa.gov/region09/superftind/prg/index.html. September. <br /> Geomatrix, 2005. Technical Approach to Site Evaluation and Decision Making, Historical <br /> Pipeline Portfolio, Central Valley Region. February. <br /> RWQCB (Central Valley Region),2000. A Compilation of Water Quality Goals, report prepared <br /> by Jon B. Marshack,D.Env. August. <br /> (Central Valley Region),2007. The Water Quality Control Plan (Basin Plan)for the <br /> Sacramento River Basin and San Joaquin River Basin. Fourth Edition(revised October <br /> 2007 with approved amendments). <br /> (San Francisco Bay Region),2008. Screening for Environmental Concerns at Sites with <br /> Contaminated Soil and Groundwater(Interim Final). May. <br /> (Central Valley Region), 2010a. Review—Well Destruction and Soil and Groundwater <br /> Investigation Report,US Can-Welty Road, Vernalis, San Joaquin County. January 26. <br /> (Central Valley Region), 2010b. Review—Soil and Groundwater Investigation <br /> Workplan, Ahern Road-Vernalis, San Joaquin County. September 9. <br /> SAIC, 2009. Monitoring Well Destruction and Soil and Groundwater Investigation Report, US <br /> Can— Welty Road, 35275 Welty Road, Vernalis, San Joaquin County, California. <br /> September 24. <br /> 7 =moi = The Benham Companies,LLC <br /> nwh.11y0.,eas.h,ia„,y <br />