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STANDARD OPERATING PROCEDURES <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, zero contamination <br /> liner tubes, 4 feet long and one inch in outside diameter The sample tube is set in a <br /> one inch inside diameter, 11 foot long sampler. The sampler is driven its entire <br /> length using a rotohammer. After the sampler is extracted from the bore hole, the <br /> sample tube is cut into 6 inch sections and the samples are removed A portion of <br /> the soil sample is immediately field tested using an organic vapor analyzer (OVA) <br /> or photo ionization detector (PID) Organic vapor procedures are listed on a separate <br /> page of Standard Operating Procedures The 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 Sates, are used as <br /> guidelines <br /> Upon removal of the sampler, the selected sampling interval is cut and <br /> immediately capped at both ends with teflon tape, trimmed and capped with plastic <br /> caps The samples are then labeled and placed in individual clear zip-lock plastic <br /> bags The samples are stored in a portable ice chest with crushed ice to maintain a <br /> constant temperature of 4' Celsius A thermometer is kept in the ice chest to ensue <br /> that the proper temperature is maintained. The samples are then delivered under <br /> chain of custody to a state certified hazardous materials testing laboratory These <br /> procedures minimize the potential for cross contamination and volatilization of the <br /> lighter 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 />