ARCHIVED REPORTS XR0010862 - Laserfiche WebLink

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Working To Restore Nature 1710 Main Street Escalon, CA 95320 Phone: (209) 838-3507 August 6, 1993 FAX: (209) 838-3509 Ms. Mary Meays San Joaquin County Public Health Services Environmental Health Division P.O. Box 2009 Stockton, CA 95024 RE: Genstar/Western Stone Products, 8181 West Eleventh Street, Tracy, California, Site Code 1393 (Figure 1) Dear Ms. Meays: In accordance with our workplan dated May 18, 1993 RESNA Industries, Inc. (RESNA), on behalf of Western Stone Products, conducted additional site investigation at the above referenced site. The proposed activities were designed to further define the extent of residual diesel ., contamination beneath the covered vehicle storage shed west of the former diesel tank location. On June 25, 1993, under the direct supervision of Ms. Mary Meays of 'San Joaquin County Public Health Services, RESNA installed two soil borings through the cement floor of the covered garage west of the former tank location (Figure 2). The borings were located to define the extent and concentration, both laterally and vertically, of rCcsidual petroleum hydrocarbon contamination west of the former tank. Prior to boring installation, depth-to-water readings were collected from monitoring well MW I to pinpoint the current capillary fringe soils (Table 1). The number and depth of samples collected was based upon changes in odor and color noted during drilling which indicated a change in petroleum hydrocarbon concentrations. DRILLING I\ ETIIODOLOGY The borings Lvere installed by hand with a hard auger and the samples were collected in clean brass tubes with a hand drive sampler. T he total depth cl'borh g BIW was 9.25' ,and the total depth of boring B2W was 8.75 feet. Four soil sarnpies were collected from boring BIW, ;u'd two were collected from boring B2W. The sampler and hand auger were cleaned with a two bucket wash system between borings and sampling events. All collected samples from each boring were submitted for laboratory analysis. The collected samples were sealed with teflon tape, and a plastid cap and placed in a sealed plastic bag and transported on ice in a airtight cooler for delivery to Sequoia Analytical Laboratory, State cert. # 1210. Collected samples were analyzed for benzene, toluene, ethyibenzene and xylenes (BTEX), and total petroleum hydrocarbon as diesel (FPHD) by EPA methods 8020 and modified 8015, respectively (Table 2). All site work was conducted in accordance with industry standards and in accordance with REPORTSO(Ari 1243.Fh;-