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PUBLIC ALTH SERVIaso u N <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTA HEALTH DIVISION <br /> Karen Furst, M.D. 'M.P.H., Health Officer <br /> 304 East Weber Avenue, 'Third Floor • Stockton, CA 95C(D <br /> trF6'F";t P <br /> 209/468-3420 <br /> FRANK RYAN FEB 2 7 E98 <br /> 745 DISTAL DRIVE <br /> LOS ALTOS CA 94022 <br /> RE: Fuller Mobile Home Park SITE CODE: 2491 <br /> 385 E. Louise Avenue <br /> Lathrop, CA I <br /> San Joaquin County Public,Health Services, Environmental Health Division i <br /> (PHS/EHD) has reviewed thIe "Eastern Soil Contamination Boundary and <br /> Confirmation Work Plan" dated January 28, 1998, prepared by W.H.F. Inc_ for <br /> the above referenced site. 1 <br /> As previously directed by PHSIEHD, the source of the continued groundwater <br /> contamination must be investigated. This will be accomplished by determining <br /> the vertical and lateral extent of petroleum contamination that exists in the soil <br /> and groundwater as a result of the operation of former underground storage <br /> tanks (UST's) at this site. <br /> Soil samples were collected, at a depth of 12 feet below ground surface (bgs), <br /> beneath the UST's at the time of removal. PHS/EHD staff notations of observed <br /> contamination were confirmed with the results of the soil sample analysis. All the <br /> soil samples collected and analyzed from the borings in 1992 at a depth of 12.5 <br /> feet bgs evidenced contamination. In addition, soil samples collected and <br /> analyzed from 10 feet bgs, when monitoring wells 1,2, and 3 were installed, <br /> evidenced contamination. <br /> The vertical extent of the contamination in the soil must be defined. All borings <br /> 9 <br /> proposed for this investigation must be advanced to a depth where volatile <br /> organic screening tools and field observations indicate that no further <br /> contamination exists. This will obviously require sampling deeper than the <br /> proposed 12.5 feet and 15 feet bgs proposed in the work plan. Sample <br /> collection every five feet or change in lithology is reguired to total depth. A <br /> minimum of one soil sample from each boring will undergo analysis for the <br /> contaminants discussed in the work plan. PHSIEHD may require additional <br /> samples be analyzed. All borings are to be logged and reported. Hand angered <br /> borings may not be capable,of retrieving soil samples to the depths necessary to <br /> complete this investigation. : <br /> Al <br /> y� <br /> I <br /> A Division of San Joaquin County Health Care Services <br /> :. si <br />