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PUBLIC HEALTH SERVICES ,oP <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISI N <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 <br /> FILE <br /> C <br /> ERNEST J POMBO JR APR 2 6 1999 <br /> P O BOX 805 <br /> TRACY CA 95378 <br /> RE: Pombo Ranch Property SITE CODE: 508110 <br /> 24100 S Lammers Road <br /> Tracy CA 95378 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> received the "Work Plan-Subsurface Investigation, P mbo Ranch Property, 24100 S. <br /> Lammers Road, Tracy, California" dated April 19, 1999 that was submitted by M. J. <br /> Kloberdanz &Associates on behalf of the above refE renced site, and has the following <br /> comments for your consideration and action. <br /> The work plan proposes "to drill up to 4 Geoprobe b rings to a maximum depth of 30 feet" in <br /> the area of the former underground tank location (boring B-3) that evidenced significant <br /> levels of petroleum hydrocarbon contamination at the September 16, 1998 environmental <br /> site assessment conducted at this site. Soil samples and one grab groundwater sample will <br /> be collected from each boring for analysis. Followin receipt of the analytical data, M. J. <br /> Kloberdanz &Associates will suggest the locations f r three monitoring wells. Please note <br /> that the scaled site map included with the work plan indicated the locations of only three new <br /> borings and that the closest one to boring B-3 is app oximately 48 feet away. <br /> In correspondence dated December 8, 1998 PHS/E D requested a work plan to define the <br /> vertical extent of petroleum hydrocarbon contaminat on in the former underground tank area, <br /> and the lateral extent to the north and the east of this area. The work plan submitted did not <br /> address the vertical extent of contamination in the source area. <br /> PHS/EHD recommends that the proposed borings be located closer to boring B-3, and that <br /> one of them be placed directly north of the former underground tank location. The location <br /> proposed in the work plan is to the northwest, beyond the location of boring B-2. The <br /> analytical results from the September 16, 1998 B-2 boring were non-detect (ND) in the soil <br /> sample collected at ten feet below surface grade (b g) and for the groundwater sample <br /> collected at fifteen feet bsg. <br /> PHS/EHD requested that a well survey, which shows the location of all agricultural, industrial, <br /> domestic, municipal and other wells within a 2000-f of radius of the site, be submitted with <br /> the work plan. While this request was acknowledge J in the work plan, the survey was not <br /> done. <br /> A Division of San Joaquin County}I alth Care Services <br />