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• s <br /> KLEINFELDER <br /> Drilling augers and associated equipment will be steam cleaned prior to the initiation of <br /> each borehole. The sampling equipment will be cleaned with a trisodium phosphate wash <br /> and a distilled water rinse prior to the collection of each soil sample. Drill cuttings will be <br /> containerized in 55-gallon drums, labeled, and left onsite. <br /> Soil Sampling Procedures <br /> Soil samples will be collected for chemical analysis and to log the subsurface lithology. <br /> Samples will be collected every 5 feet to the termination depth of the boring. Soil samples <br /> will be collected by advancing the boring to a point immediately above the sampling depth <br /> and then driving a Modified California Sampler lined with three brass tubes into the <br /> undisturbed soil. The sampler will then be removed from the bottom of the boring and the <br /> bottom (third) tube sealed with Teflon tape and tight-fitting plastic caps. The sealed tube <br /> will be immediately stored in an iced cooler. <br /> Qualitative Field Screening <br /> Each soil sample will be qualitatively screened in the field with an organic vapor analyzer <br /> (OVA) to assess the presence of volatile organic constituents and to assist in the selection <br /> of samples to analyzed. The OVA measures total hydrocarbon compounds in air in parts <br /> per million by volume (ppmv). Calibration will be performed prior to use in the field. The <br /> OVA field screening of the soil samples should provide a qualitative indication of the <br /> presence of petroleum hydrocarbons. <br /> Sample Selection and Analysis <br /> The sample with the highest OVA reading from the deep boring and the bottom sample <br /> will be selected for laboratory analysis. The sample collected at a depth of 10 feet from the <br /> shallow boring will also be selected for laboratory analysis. <br /> Samples to be analyzed will be submitted under chain-of-custody to California Analytical <br /> Laboratories/ENSECO in West Sacramento. Two soil samples from the deep boring near <br /> SB-5 will be analyzed for TPH extractable (Method 3550) by gas chromatography - flame <br /> ionization detector (GC-FID); oil and grease by gravimetric method; benzene, toluene, <br /> ethyl benzene, and xylene (BTEX) by EPA Method 8020; and lead, chromium, cadmium <br /> and zinc by inductively coupled argon plasma (ICP) spectrometer. The sample collected <br /> from the boring drilled to assess background metals concentrations levels will be analyzed <br /> only for lead, chromium, cadmium, and zinc by ICP spectrometer. <br /> Project Schedule <br /> Upon SJEHD approval of the Site Assessment Work Plan Addendum, Kleinfelder will <br /> implement the plan. This implementation will commence within one to two weeks of <br /> SJEHD approval and is planned to take four to six weeks to complete. <br /> Report of Findings <br /> Upon completion of the field activities and receipt of the analytical results, a report of <br /> findings will be prepared for agency submittal. The report will present our field <br /> observations and assessment of the analytical results. Kleinfelder may recommend further <br /> assessment, if warranted. <br /> F10-90-243 2 <br />