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C A M B R I A <br /> 0 <br /> RECOMMENDATIONS <br /> To provide further delineation of gasoline constituents beneath this site we recommend installing <br /> two additional clusters of groundwater monitoring wells One well cluster should be placed in <br /> the vicinity of MW-3 and CPT-9 The other well cluster should be placed on the adjacent <br /> property near well MW-10 Each well cluster should consist of two wells each, screened from <br /> approximately 70 to 80 fbg and 110 to 120 fbg A work plan for installing these wells is <br /> presented below <br /> WORK PLAN <br /> Permits: Cambria will obtain drilling permits from SJCEHD <br /> Site Safety Plan Cambria will prepare a site safety plan for field work <br /> Utility Clearance: Cambria will mark proposed drilling locations and will clear the locations <br /> through Underground Service Alert prior to drilling <br /> Site Investigation- A total of four wells (two wells each in two clusters) are proposed at the <br /> locations shown on Figure 3 One well in each cluster will be screened in the 70 to 80 fbg <br /> interval and the other well in each cluster will be screened in the 110 to 120 fbg interval These <br /> wells will be used to monitor the southern and southeastern extent of petroleum hydrocarbons in <br /> the deep zones <br /> The wells will be drilled with roto-sonic drilling equipment or with mud rotary and hollow-stem <br /> auger (HSA) drilling equipment If roto-sonic drilling equipment is not used the mud rotary rig <br /> will be used to set conductor casings and the HSA rig will be used to complete the wells inside <br /> the conductor casings <br /> A Cambria geologist will supervise the drilling, and encountered soils will be logged at 5-foot <br /> intervals or continuously if roto-sonic drilling equipment is used Since soil samples were dust <br /> analyzed in boring CPT-9, we do not plan to collect and analyze soil samples from the well <br /> cluster drilled near CPT-9 and MW-3 For the well cluster installed near MW-10, we do plan to <br /> collect and analyze soil samples from the deeper of the two well borings Soil samples will be <br /> retained in brass or stainless-steel sample tubes and covered on both ends with Teflon sheets and <br /> plastic end caps Soil samples will be labeled, entered onto a chain-of-custody record, and <br /> • <br /> t399 7 <br />