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10/31/96 10:40 $19163645633 HLA SACRAMENTO 12003 <br /> Harding Lzw"n Ascociates <br /> October 30, 1996 <br /> 30371 3 <br /> Mr. Steve Sasson <br /> SJCEI ID <br /> Page 2 <br /> The lowermost tube from each sample interval will be removed from the sampler and immediately <br /> capped with Teflon-lined plastic end caps,labeled,and placed in an ice-chilled cooler for transport <br /> to a State-certified analytical laboratory. Samples will be recorded on a standard HLA chain-of- <br /> custody form to document sample identification and handling. The remaining soil sample from <br /> each interval will be chocked for hydrocarbon stains and monitored for VOC vapors using a <br /> phoinionization detector(PID)which is calibrated daily. Thr.PILI will be equipporl with a 10.2 <br /> electron-volt lamp and calibrated to a 100 part per million (ppm) isobutylcric standard_ <br /> The borings will be logged under the supervision of a California mgistamd geologist_ Thu soils will <br /> be visually classified using the Unified Soil Classification System(USCS);sail classificatici�ss olid <br /> other field observations are recorded on standard HLA field logging forms. HLA has assumed that <br /> the soil borehole can be drilled with conventional hollow stem auger drilling equipment Drilling <br /> equipment will be steam cleaned prior to each use. Soil sampling equipment will be washed in a <br /> residue-free detergent(such as Alconox,Liquinox,TSP,etc.)and rinsed in tali water and deionized <br /> water prior to each use. After drilling is terminated,the borings will be grouted with neat cement in <br /> accordance with SJ(:EHD requirements_ Soil cuttings generated during drilling activities will be <br /> stockpiled uu visqueen- The cuttings will be retained on site pending analytical results. <br /> Task 2-Analytical Program <br /> A maximum of four soil samples will he snlncted from each boring basad on subjective field rritcria <br /> (Pill readings,soil discoloration,and hydroc-rubon odors)as well ns the objertives of the field <br /> investi8ation. These samples will be,analyzed for total petrolenin hydrocarimus as gasnhne(TP148) <br /> and total petroleum hydrocarbons as diesel (TPHd)by Fnvironmental Pnitection Agency(FFA) <br /> Method amlvl;and also for ben7.ene,toluene,ethylbenzene,and total xylenes(I3Tf.X)with EPA <br /> Method 8020. <br /> Selected soil samples will be analyzed for total lead with EPA Method 7420A or 6010. Samples <br /> selected for analyses will be based on TPHg analytical results. Soluble lead analyses for soil samples <br /> will be performed only on samples for which the total lead concentration exceeds 10 times the <br /> soluble threshold limit concentration(STLC)for lead. <br /> Because the UST was removed approximately 6 years,soil samples are not likely to contain methyl <br /> tertiary butyl ether(MTBE). MTBE is a gasoline additive that was first incorporated into gasoline <br /> formulations ten years ago in California and within the past few years in the Central Valley <br /> (RWQCB, 1996). However,in order to eliminate potential disposal problems at a later date selected <br /> soil samples with high concentrations of TPHg will be analyzed for MTBE. In accordauue with the <br /> RWQCB analytical protocol established for confirming false positives and false negatives one sainple <br /> will be analyzed for M'I'l3}s using EPA Method 8260(RWQCl3, 1996). <br />