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California Regional Water QualityControl <br /> Board <br /> Central Valley Region lam.-.. ., <br /> Alan C.Lloyd,Ph.D. Robert Schneider,Chair ". <br /> Secretary for Arnold <br /> Environmental Fresno Branch Office Schwaraenegger <br /> Protection 1685 E Street,Fresno,California 93706 <br /> (559)445-5116•Fax(559)445-5910 Governor <br /> http.//www.waterbOaTds.ca.gov/centralvalley /1� <br /> 6 July 2005 lel� CE&ED <br /> M. Scott Mansholt ""L - 7 2o05L; <br /> Chevron Environmental Management Company ENVIRO <br /> 6001 Bollinger Canyon Road PERMN�RoEESTH <br /> Rm K2066 <br /> San Ramon, CA 94583-2324 <br /> REVIEW OF SOIL AND GROUNDWATER INVESTIGATION, FORMER LYOTH LOADING <br /> STATION, TRACY, SAN JOAQUIN COUNTY <br /> I have reviewed the 25 May 2005 Soil and Groundwater Investigation Report, Former Lyoth Loading <br /> Station, 26501 Banta Road, San Joaquin County, prepared for ChevronTexaco by Science Applications <br /> International Corporation (SAIC). <br /> Backeround <br /> The Lyoth property is a former crude oil loading station located on a triangular land parcel adjacent to <br /> the former Old Valley Pipeline (OVP) and California Northern Railroad Company tracks. Several <br /> aboveground tanks were utilized for temporary storage of crude oil and Bunker C locomotive fuel. In <br /> 1957 the crude oil storage tanks and facility were dismantled and removed. The Hoffman Brothers <br /> Trucking Company has operated a trucking operation at the site since they purchased the property <br /> several years ago. <br /> Site investigations have been conducted at the site since 1990 to assess the extent of impacted Soil and <br /> groundwater affected by leaks associated with the former OVP and loading station facility. A summary <br /> of historical information related to the site is provided in other project soil and groundwater <br /> investigation reports. Numerous soil borings and monitoring wells have been advanced/installed to <br /> evaluate the extent of impacts associated with the property. Semi-annual groundwater monitoring is <br /> conducted using four onsite and two offsite monitoring wells; one onsite well, MW-2 contains a <br /> petroleum sheen and is not sampled. Approximately five gallons of oil/water have been removed from <br /> MW-2 since 1997. At this time, an absorbent sock is being used to remove the remaining petroleum <br /> sheen from this well. <br /> Overall, based on the previous investigations, it appears that impacted soil and groundwater has been <br /> delineated onsite, is limited in extent to beneath and next to a former 55,000-barrel storage tank, and <br /> along two areas of the former pipeline. However, the downgradient extent of impacted <br /> offsite to the north, has not been defined. groundwater, <br /> In 1999, a Health Risk Assessment (HRA) incorporating analytical soil results from various onsite <br /> investigations was submitted to the California Office of Environmental Health Hazard Assessment <br /> California Environmental Protection Agency <br /> Co Recycled Paper <br />