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• <br />ATTACHMENT F <br />FIELD AND LABORATORY PROCEDURES <br />Exploratory Drilling <br />Soil samples were collected continuously from 55 feet bgs using a California -modified split - <br />spoon sampler Borings were drilled using 8-mch hollow -stem auger drilling equipment and <br />logged by a SECOR representative using the Unified Soil Classification System and standard <br />geologic techniques, under the direction of a California Registered Geologist All soil samples <br />for chemical analysis were retained in brass liners, capped with Teflon squares and plastic end <br />caps, and sealed in clean zip -lock bags The samples were placed on ice for transport to the <br />laboratory accompanied by chain -of -custody documentation Down -hole drilling and sampling <br />equipment was steam -cleaned prior to and following the completion of the soil boring Down- <br />hole sampling equipment was washed in a tri -sodium phosphate or alconox solution between <br />samples <br />Groundwater Monitoring Well Installation <br />Between October 6, 2000 and February 22, 2001, seven (7) soil borings (B4, B6, B8, B9, B10, <br />B11, and MW -8S), nine (9) groundwater monitoring wells (MW -7B, MW -8S, MW -9B, MW - <br />IOC, MW -17B, MW -18B, MW -19C, MW -20A, and MW -20B), and one (1) groundwater <br />extraction well (EX -3) were drilled and installed at the site by Cascade Drilling and Western <br />Strata Exploration (WESTEX) <br />The intended purpose, screen interval, and total depth of the newly installed wells are presented <br />below. <br />49 <br />