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CAMBRIA <br /> determined during drilling and will be based on soil classification in the proposed well boring. <br /> This well will be constructed using 4-inch diameter Schedule 80 PVC casing. The sandpack for <br /> all wells will be placed from the bottom of the well screen up to 2 feet above the top of the <br /> screen, followed by a 2-foot thick bentonite seal and cement grout to grade. Actual well <br /> construction details will be based on field conditions during drilling. Each well will be secured <br /> with a locking cap under a traffic-rated well box. <br /> Well Development and Sampling: Blaine Tech Services, Inc. (Blaine) of San Jose, California <br /> will develop the new groundwater monitoring wells prior to sampling. After well development, <br /> Blaine will sample the site groundwater monitoring wells according to the existing sampling <br /> schedule and submit the samples to a State of California certified laboratory for chemical <br /> analyses. <br /> Chemical Analyses: Groundwater samples and selected soil samples from MW-5, MW-6, and <br /> MW-7 will be analyzed for TPHg, BTEX, fuel oxygenates, and lead scavengers by EPA <br /> Method 8260B. Groundwater samples from the existing wells (MW-1 through MW-4) will be <br /> analyzed according to the revised groundwater monitoring program,proposed below. <br /> Wellhead Survey Activities: Following monitoring well installation, a licensed surveyor will <br /> survey wellhead elevations relative to mean sea level and the latitude and longitude of each well <br /> location. <br /> Report Preparation: Following the receipt of analytical results from the laboratory, Cambria will <br /> prepare a written report which will include field procedures, laboratory results, boring logs, and <br /> conclusions. <br /> The scope of work described in this work plan will be performed under the supervision of a <br /> registered geologist. <br /> Revised Groundwater Monitoring Program <br /> In the August 26 2004 letter, SJCEHD requests that Shell resume analyses for five fuel <br /> g � q Y <br /> oxygenates. Shell reduced the oxygenate analyses in well MW-1 and discontinued oxygenate <br /> analyses other than MTBE in wells MW-2, MW-3, and MW-4 after the July 2002 sampling <br /> event. No oxygenates except MTBE (and TBA in well MW-1) had been detected during four <br /> quarters of monitoring and SJCEHD staff approved this sampling reduction during a <br /> March 27, 2002 telephone conversation with Cambria. <br /> 1359 5 <br />