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Mr Ron Rowe CAMBRIA <br /> April 30, 1998 <br /> • INVESTIGATION PROCEDURES AND RESULTS <br /> In the hwestigation Work Plan Addendtun, Cambria proposed to install one ground water monitoring well <br /> neat the southeast dispenser island If field evidence of hydrocarbons were present, two addttional wells <br /> would be installed <br /> The results of Cambria s March 23 and 24, 1998 well installation are summarized below The monitoring well <br /> location is shown in Figure I Analytical results for soil and ground water samples are presented in <br /> Tables 1, 2, and 3 <br /> Paul Waite of Cambria and Ron Rowe of the SJCPHS weie onsite to ovetsee the well drilling and sampling <br /> Because there was no Significant field evidence of hydrocarbons in the soil or giound watei duimg the dolling <br /> at the initial location, it was agreed that the additional wells proposed in the woik plan would not be installed <br /> Soil Boring and Well Installation <br /> Permits SJCPHS Drilling Permit No 014531 (Attachment A) <br /> Drilling Date The well casing and sand pack were installed and temporarily scaled on <br /> March 23, 1998, and the giouting and well completion were completed on <br /> March 24, 1998 <br /> Drilling Method 8-inch hollow stem auger The first 5 ft of the boring were hand-augeied <br /> Soil Sampling The soil sample collected from approximately 2 5 ft depth was from <br /> hand-auger cuttings The rest of the samples were collected using an 18-inch <br /> modified California split spoon sampler with clear acetate liners <br /> Ground Water Sampling Cambria unsuccessfully attempted to collect a ground water sample from Just <br /> below the capillary fringe using a BATF sampler A bailer was used to collect <br /> a grab ground water sample through the hollow stem auger when the bottom <br /> of the boring was at 28 7 ft depth <br /> Number of Wells One Well MW-1 (Figure l) <br /> Boring Depth 35 ft below grade(Attachment B) <br /> Ground Water Depth Ground water was initially encountered at 24 5 ft,and the static water level was <br /> measured at 26 5 ft (Attachment B) <br /> Sediment Lilhology Primarily alternating silty sands and sandy silts, to the total depth explored of <br /> 35 tt(Attachment B) <br /> 2 <br />