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C A M B R A <br /> • Cambria proposes one groundwater monitoring well to further investigate the vertical extent <br /> of petroleum hydrocarbons in groundwater beneath the site <br /> Work Tasks <br /> Permit- An appropriate permit for drilling will be obtained from SJCEHD <br /> Site Safety Plan Cambria will prepare a Site Safety Plan for field work <br /> Utility Clearance: Cambria will mark proposed drilling location and the location will be cleared <br /> through Underground Service Alert prior to drilling <br /> Site Investigation One exploratory soil boring (S-7) is proposed at the location shown on <br /> Figure 2 The exploratory boring will be drilled using hollow-stem auger equipment and will be <br /> converted to a groundwater monitoring well If warranted, Cambria will install a conductor <br /> casing to seal off shallow groundwater during well construction Well S-7 will be located <br /> adjacent to boring CPTH where the highest benzene concentration was reported in groundwater <br /> . from the 40-to 45-fbg zone It is also downgradient of the former fuel USTs <br /> A Cambria geologist will supervise the drilling and describe encountered soils using the Unified <br /> Soil Classification System and Munsell Soil Color Charts Soil samples from the borings will be <br /> collected at 5-foot intervals for soil description and organic vapor screening with a photo- <br /> ionization detector(PID) Cambria will prepare an exploratory boring log for each well, and PID <br /> measurements will be recorded on the boring logs No soil samples will be retained for chemical <br /> analysis as this area has been adequately characterized by previous soil borings <br /> Monitoring Well Installation• The boring will be drilled to approximately 45 fbg, depending on <br /> the soils encountered during drilling The well will be constructed using 4-mch diameter <br /> Schedule 40 PVC casing, and will be screened from approximately 40 to 45 fbg The sandpack <br /> will be placed from the bottom of the well screen up to 2 feet above the top of the well screen <br /> followed by a 2-foot thick bentonite seal and cement grout to grade Actual well construction <br /> details will be based on field conditions during drilling The well will be secured with a locking <br /> 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 well prior to sampling After well development, <br /> Blaine will sample the site groundwater monitoring wells according to the existing sampling <br /> 0943 6 <br />