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I <br /> • Additional Site Assessment Report NOV 3 2�0� <br />' YAMADA BROTHERS <br /> 15406 South Tracy Boulevard, Stockton, California ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br />' 1.0. 1NTRODUCTION <br /> In accordance with the request of Mr Bob Yamada of Yamada Brothers, Inc , Advanced <br /> GeoEnvironmental, Inc (AGE) has prepared this additional site assessment report for the property <br /> located at 15406 South Tracy Boulevard, Stockton, California The scope of work mcluded <br /> I advancement of four soil probe bonngs and collection and analysis of grab water samples The <br /> location of the site is illustrated on Figure 1, structures and soil probe boring locations are illustrated <br /> on Figure 2 <br /> This investigation was performed m accordance with guidelines of the Central Valle Regional <br /> g P l� Y � <br /> Water Quality Control Board for the investigation of underground storage tank(UST) sites <br />' 2.0. BACKGROUND <br /> The site is located on Union Island on the east side of South Tracy Boulevard, south of Clifton Court <br /> jai Road and north of the Grant Line Canal, north of the City of Tracy, San Joaquin County, California <br /> The site is located in the northern half of Section 29, Township 1 South, Range 5 East,Mount Diablo <br /> Base and Meridian in an area of low topographic relief, at an elevation of approximately 3 feet above <br /> mean sea level (Union Island Quadrangle, 7 5-Minute USGS Topographic Series, 1978) The site <br /> and surrounding area operate as farms <br /> AGE has been informed that two USTs were removed from the site in July 1991 Ground water was <br /> encountered at a depth of approximately 7 feet below surface grade (bsg) during the UST removal <br /> Total petroleum hydrocarbons quantified as diesel (TPH-d) were detected in a grab water sample <br /> collected from the excavation at a concentration of 210 micrograms per liter (µg/1) following <br /> removal of the UST Analytical results of soil samples collected were not available The San Joaquin <br /> County Public Health Services - Environmental Health Division (PHS-EHD) subsequently required <br /> investigation to determuie the extent of impacted soil and ground water <br /> I Three domestic wells are located approximately 150 feet southwest of the former USTs location <br /> According to Mr Bob Yamada, bottled water is used for all drinking water and cooking at the site <br /> In November 1999, three ground water monitoring wells were installed at the site Low <br /> concentrations of the oxygenated ether methyl-tertiary butyl ether (MTBE) have been detected in <br /> samples collected from the three ground water monitoring wells and a domestic well at the site No <br /> Iother analytes of concern have been detected in ground water samples since monitoring began in <br /> • November 1999 On 13 April 2001 AGE personnel made a site visit to identify a potential source <br /> for the MTBE contamination, no apparent above-ground source was located <br /> Advanced GeoEnvtronmental,Inc <br />