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� ^ 22 May 2002 <br /> AGE-NC Project No. 01 -0877 <br /> Page 7 of 9 <br /> 4.0. FIELD PROCEDURES <br /> All field procedures will be overseenby an AGE representative under the supervision of a California <br /> Registered Geologist. Procedures for soil and ground water sampling and sample shipment, <br /> monitoring well installation and development, equipment decontamination and boring abandonment <br /> are outlined below. <br /> 1 <br /> 4. 1 , SOIL SAMPLING <br /> Proposed well borings will be completed using hollow-stem auger drilling techniques. Relatively <br /> undisturbed soil samples will be collected ahead of the drill bit at selected intervals in each of the <br /> borings using a California modified split-spoon sampler fitted with 2-inch diameter, 6-inch long <br /> brass sleeves. Upon removal from the sampler, the exposed ends of a selected sleeve will be covered <br /> with Teflon sheets, capped and sealed with tape. Soil sample duplicates will be visually classified <br /> by an AGE geologist in accordance with the Unified Soil Classification System (USCS). <br /> Additionally, soil samples will be field-screened for the presence of volatile organic compounds <br /> using an organic vapor meter (OVM) . <br /> Following sample collection, each preserved sample sleeve will be labeled with the boring location, <br /> depth, time, date and sampler' s initials. Appropriately sealed and labeled samples will be placed in <br /> a chilled container under ice and transported under chain-of-custody to a DHS-certified laboratory. <br /> 4.2 . MONITORING WELL INSTALLATION <br /> Following completion of drilling of each pilot monitoring well pilot boring, a 2-inch diameter <br /> Schedule 40 PVC 0. 020-inch slotted well screen and casing will be installed. A 20-foot section of <br /> well screen will be installed in each well, extending from approximately 20 feet bsg to 40 feet bsg. <br /> - 1 The well casing, filterpack and sealing materials will be placed into the borehole through the interior <br /> of the hollow-stem augers . After installing the well casing, filter pack material consisting of <br /> 1 pre-washed #3 Lonestar sand will be added from the bottom of the borehole to approximately one <br /> to two feet above the screened interval. Following placement of the filter pack, the well will be <br /> surged to assist in settling the filter pack. Additional sand will be added if settling occurs. <br /> A nominal two-foot thick bentonite seal will be placed above the filter pack to minimize grout <br /> penetration into the screened section of the well. The bentonite seal will be formed by pouring <br /> ibentonite chips into the annular space between the auger and the well casing and allowing them to <br /> a Advanced GeoEnvironmental, Inc. <br />