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Mr Mike hifurna <br /> March 27, 2006 <br /> C A M B R I A <br /> with three depth-discrete groundwater grab samples in each boring to assess the vertical and lateral <br /> extent of hydrocarbons in soil and groundwater <br /> The site conceptual model is presented as Table 1 and the associated hydrogeologic cross-sections <br /> with estimated hydrocarbon concentration contours are presented in Figures 6, 7, and 8 Soil and <br /> groundwater grab sample results are included in summarized historical Tables 2 and 3, respectively <br /> Boring logs and permits are presented in Attachment B Laboratory analytical results for soil and <br /> grab-groundwater are presented in Attachment C Cambria's Standard Field Procedures for Soil <br /> Borings are presented as Attachment D <br /> Permits San Joaquin County Permits (Attachment B) <br /> Drilling Company Gregg Drilling and Testing of Martinez, CA (C-57 License <br /> #485165) <br /> Sampling Personnel Staff Geologists Remo Ratilamen and Leon Gearhart conducted <br /> all fieldwork undei the supervision of California Professional <br /> Geologist Michael D Miller (P G # 6008) <br /> • <br /> Nunnber of Soil Borings Three soil borings(B-5 through B-7) <br /> Drilling Method The first 8 feet of each boring was cleared using a hand auger to <br /> ensure no subsurface utilities were encountered during drilling <br /> Below 8 feet, all borings were advanced using direct push <br /> Geoprobe drilling rig Standard Field Procedures for borings are <br /> presented as Attachment D <br /> Soil Sampling Soil samples were collected every five feet, with the 5-foot <br /> I <br /> sample being a grab sample Table 1 presents soil analytical <br /> results for monitoring soil borings B-5 through B-7 <br /> Groundwater Grab Sampling Groundwater grab samples were collected at discrete depths of <br /> 20, 30, and 40 feet in soil borings B-5 through B-7, using a <br /> disposable bailer <br /> • <br /> 3 <br />