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Mr.Brian Taylor•==-- Formatted:Wght <br /> jlangM 31,2008 _ Delated:M:.arianr.ym� <br /> r---- Ddebadaenuory 3l,2(p8Q <br /> Access: It is a Shell facility. CRA will obtain work permits from the facility management for both <br /> monitoring well installation and pilot test. <br /> Pamirs. CRA will obtain well installation permits from San Joaquin County Public Environmental <br /> Health Department(EHD). <br /> Site Safety Plan: CRA will prepare a comprehensive site-specific safety plan according to the safety <br /> requirements of the facilityto protect site workers. The plan will be reviewed and signed by facility <br /> management and each site worker. The plan will be kept on the site during field activities. <br /> Safety Planning Field Mir: All personal involved in the monitoring well installations and pilot test will <br /> have a pro-work safety training session with facility management. <br /> Utility Clearance: CRA and/or facility management will mark the proposed drilling locations. The <br /> locations will be cleared using a private utility locating service if required by facility management. <br /> Extraction Well Installation: Assuming the absence of subsurface and overhead obstructions,CRA will <br /> use a drill rig equipped with hollow-stem augers to drill the the five wells wells. The well borings will be <br /> advanced to approximately 30 tbg. Soil samples from the well borings will be collected at 5-foot <br /> intervals for soil description, screening for organic vapors using a photo-ionization detector(PID), and <br /> laboratory analysis. CRA will prepare an exploratory boring log for each well, which will include PID <br /> measurements. - <br /> Unless other information suggests differently, the extraction wells will be constructed using 4-inch <br /> diameter Schedule 40 PVC casing with 0.020-inch circumslot screen. The observations wells will have a <br /> 2-inch diameter casing. The well screen intervals will be from approximately 5 to 25 tbg to allow <br /> adequate vadose zone exposure and accommodate'dewatering. A 2/16 sandpack will be placed from the <br /> bottom of the well up to 2 feet.above the top of the well screen followed by a 2-foot thick bentonite seal . <br /> and bentonite-cement grout to grade. Actual well construction details will be based on field conditions <br /> during drilling. The wells will be completed with a three-foot standpipe if located in the secondary <br /> containment area of the facility,or a vault box mounted flush with grade. The wells will be secured with <br /> a locking cap. <br /> Following well installation,Blaine Tech Services, Inc. (Blaine)of San Jose, California will develop the <br /> wells. After well development, Blaine will sample the well and submit the samples to a California- <br /> certified laboratory for chemical analyses. <br /> 241729 5 <br />