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STANDARD OPERATING PROCEDURES <br /> i <br /> Soil Borings and Sampling <br /> Soil borings are lithologically logged by Parker staff under the direction and <br /> supervision of a state registered geologist using the Unified Soil Classification <br /> System During the drilling, discrete soil samples are collected at approximate 5 0 <br /> depth intervals to the top of the groundwater for lithologic and hydrographic <br /> description and possible chemical analysis <br /> Soil samples for chemical analysis are collected in pre-cleaned, thin walled brass <br /> tubes, 6 inches long and 2 inches in outside diameter Three sample tubes are set in a <br /> 2 inch inside diameter, 18 inch long modified California split barrel sampler The <br /> split barrel sampler is driven its entire length using a drop hammer, typically 140 <br /> pounds After the sampler is extracted from the bore hole, the brass tubes containing <br /> the samples are removed The third (top) soil sample is immediately field tested <br /> using an organic vapor analyzer (OVA) or photo ioruzation detector (PID) Organic <br /> vapor procedures are listed on a separate page of Standard Operating Procedures <br /> Soil sampling is performed in accordance with California Regional Water Quality <br /> Control Board (RWQCB) procedures described in the Leaking Underground Fuel <br /> . Tank (LUFT) Field Manual, the Tri-Regional Board Staff Recommendations for <br /> Preliminary Evaluation and Investigation of Underground Tank Sites, and local <br /> regulatory guidelines <br /> Upon removal of the sampler, the selected brass tubes are immediately capped at <br /> both ends with teflon tape, trimmed and capped with plastic caps The samples are <br /> then labeled and placed in individual clear zip-lock plastic bags The samples are <br /> stored in a portable ice chest with crushed ice to maintain a constant temperature of <br /> 4° Celsius A thermometer is kept in the ice chest to ensue that the proper <br /> temperature is maintained The samples are then delivered under chain of custody <br /> to a state certified hazardous materials testing laboratory These procedures <br /> minimize the potential for cross contamination and volatilization of the lighter <br /> organic compounds prior to chemical analysis <br /> The sampling equipment is cleaned with Alconox detergent wash, two tap water <br /> and one deionized water rinses between samples and steam cleaned with all the <br /> drilling equipment between borings to prevent cross contamination <br /> Parker Environmental Services 4185 Rialto Court Pittsburg CA 94565-6116 <br /> Phone (510) 439-1024 Fax (510) 439-2566 <br />