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L December 5,2005 NOA Project Number.. E05118A L • ChevronTexaco,U.S., CAN 35275 Welty Road,Vernalis L3.1.2 San Joaquin Couaty Environmental Health Department According to Mrs. Kimberly Blackwell of the EHD, these two files were available for file review.' L35275 Welty Road is located approximately one quarter mile northeast of the subject property. According to a report done in August of 2003 by Geomatrix, the site has been recorded as a L source of contamination including pollutants such as petroleum hydrocarbons and chlorinated volatile organic compounds (VOCs). Historical use of the site was for the production of cans, and the site is currently used to manufacture containers.The source of petroleum hydrocarbons L has been connected with the Old Valley Pipeline that transported heavy crude oil.The pipeline runs parallel to the Union Pacific railroad tracks to the northeast of 35275 Welty Road. The presence of chlorinated volatile organic compounds(VOCs),includingTrichloroethylene(TCE) L and Trichloroethane (TCA) in soil and groundwater is likely due to the former can manufacturing plant located at 35275 Welty'. I For the last decade,there has been monitoring of the contamination.According to a report by L the CVRWQCB in December of 2003,'the extent of the soil and groundwater contamination had been generally delineated laterally on-site.However,the extent of on-site vertical or off-site L lateral contamination had not been delineated.A work plan had been requested by the RWQCB for a time schedule to evaluate the off-site lateral extent for impacted soil and groundwater.It was also mandated to install more groundwater monitoring wells and a groundwater sampling plan. j„ According to personal communication on December 2,2005 with C. Dean Hubbard of RWQCB', contamination on site has been generally delineated;most of the contamination was on-site and to the northeast of the site where the pipeline ran. New monitoring wells have been installed and there is a quarterly monitoring of the site and to the northeast of the site. Groundwater is found at 30 to 35 feet below ground surface and runs east and 'Personal Communication,September 22,2005. ' Geomatrix,August 2003,Report of Off-Site Soil and Groundwater Investigation;U.S. Cm/35275 Welty Road,Vernalis California. L 'California Regional Water Quality Control Board,December 4,2003;Offsite soil and groundwater investigation,U.S./Welty Road,Vernalis,San Joaquin County. L 'Personal Communication C.Dean Hubbard,Regional Water Quality Control Board,December 2,2005. 5 L L