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San Joaquin County. Publealth Services , -4 .. <br /> January 2, 1991 <br /> collected to ensure sample integrity and to document sample possession from the .time <br /> of collection to its final destination. Two samples collected from each the two borings <br /> will be retained for laboratory analysis. The ' selected soil samples will consist of the <br /> sample from each boring which is field screened as having the highest <br /> concentration of volatile hydrocarbons, and the soil sample from total depth in each <br /> boring. <br /> Sampling equipment will be washed with 'TSP (tri-sodium phosphate) cleanser, <br /> and rinsed with tap water and de-ionized water prior . to sampling, between sample <br /> intervals, and between borings to reduce the possibility of cross-contamination. The <br /> drilling augers will be steam cleaned between _borings, also to reduce the possibility <br /> Of cross-contamination. Drill cuttings, and soil sample spoils,will be contained in <br /> D.O.T. approved 55-gallon drums awaiting confirmation from laboratory analysis as to <br /> whether the contents are hazardous. Disposal of drums and drill cuttings soil is the <br /> responsibility of the facility operator, and costs for this task are not included in this <br /> proposal. The soil borings will be backfilled with bentonite and a neat cement <br /> slurry. <br /> A field engineer or geologist will be on-site to . log the borings in accordance <br /> I <br /> with the Unified Soil Classification System, monitor soils during drilling for <br /> contamination, collect soil samples, and -oversee .abandonment of the soil borings. <br /> Laboratory Analysis of Soil Samples <br /> Soil samples will, be sent to Eureka Labs. Inc.of Sacramento, California, a state- <br /> certified laboratory for chemical analysis. Based on field observations, two soil <br /> samples from each boring will be selected for laboratory analysis. The four soil <br /> samples will be analyzed for total petroleum hydrocarbons. (TPH) and benzene, <br /> toluene, ethylbenzene, and total xylenes (BTX&E) using USEPA Test Method 8240/8260 <br /> I <br /> (Fuel Fingerprint), i <br /> REPORT OF FINDINGS <br /> A report will be prepared which details the field activities, sampling <br /> procedures, analytical results, data analysis, conclusions, and recommendations: <br /> Based upon the conclusions, Earth Systems Environmental will recommend what <br /> 9201-E015.WP EK-6014-1 <br />