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ih} tl <br /> R <br /> Mr Ronald Rowe <br /> C A M B R I A August 26, 1999 <br /> • appears adequately defined However, to confirm that the vertical extent is defined, we <br /> recommend drilling one boring immediately adjacent to boring SB-3 to 80 fbg Soil samples for <br /> logging and for possible laboratory chemical analysis will be collected at five-foot intervals If <br /> there are obvious field indications of hydrocarbons in soil at 60 fbg, then we will continue <br /> drilling until no field indications are observed <br /> We also recommend collecting grab water samples from the boring near SB-3 to define the <br /> vertical distribution of hydrocarbons in groundwater The boring will be drilled with Cone <br /> Penetrometer Testing (CPT) equipment We will first log the soil with the CPT equipment to <br /> identify any coarse-grained sediments which may be present beneath the site These coarse- <br /> grained sediments (if found) will be targeted for groundwater sample collection Groundwater <br /> samples may also be collected in fine-grained sediments immediately above any coarse-grained <br /> intervals to assess whether the hydrocarbons detected in the coarse-grained intervals originate <br /> from the site or appear to be migrating onto the site from off-site sourdces <br /> We will base our recommendation for additional borings and wells upon the analytic results for <br /> the boring near SB-3 The data collected will allow us to properly screen any new wells that <br /> may be installed at the site <br /> • We do not recommend installing any wells prior to collecting the data from our proposed boring <br /> If the concentration decreases discussed above are the result of a rising water table, then <br /> installing wells with screens shallower than the existing wells will likely result in shallower, <br /> clean wells We need to determine the impacted depths prior to installing additional wells <br /> Permits <br /> Appropriate permits for drilling permits will be obtained from SJCPHS <br /> Health and Safety Plan <br /> A site-specific Health and Safety Plan will be prepared for field work <br /> Utility Clearance <br /> The proposed drilling location will be marked and cleared through Underground Services Alert <br /> (USA)prior to drilling <br /> 6 <br />