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Site Background Information Sutter Office Center Page 3 of 7 On 09 to 11 April 2003, five soil borings(CPT-1 to CPT5)were advanced on-and off-site utilizing cone penetrometer testing(CPT)technology At each boring location, lithologic data was collected I from the initial CPT boring, an adjacent twin boring was then advanced at each CPT location to collect grab ground water samples from selected depths The objective of the investigation was to model the geologic and hydrogeologic frameworks and to assess potential dissolved petroleum-migration pathways beneath the site Soil borings for sounding were as follows • CPT-1 was established in the vicinity of monitoring well MW-1 and soil borings A and I to a depth of 150 feet bsg, • CPT-2 was established in the vicinity of soil borings B and J to a depth of 160 feet bsg, Ia CPT-3 was established west of boring C to a depth of 160 feet bsg, • CPT-4 was established south of monitoring well MW-1 and soil borings E and G to a depth of 150 feet bsg, and • CPT-5 was advanced at the northeast corner of the intersection of California Street and Miner Avenue to a total depth of 160 bsg Ground water and soil samples were collected from CPT boring locations at the following intervals • CPT-1 was sampled between 96 and 100 feet bsg, 120 and 124 feet bsg, and 146 feet and 150 feet bsg, I0 CPT-2 was sampled between 93 and 97 feet bsg, 120 and 124 feet bsg, 146 and 150 feet bsg, and 181 and 185 feet bsg, ' 0 CPT-3 was sampled between 56 and 60 feet bsg, 104 and 107 feet bsg, 120 and 124 feet bsg, and 143 and 147 feet bsg, ' a CPT-4 was sampled between 101 and 105 feet bsg, 120 and 124 feet bsg, and 141 and 145 feet bsg, and ' a CPT-5 was sampled between 56 and 60 feet bsg, 104 and 108 feet bsg, and 146 and 150 feet bsg i ' Soil samples were collected from boring CPT-1 at 55 and 78 feet bsg The computer-generated CPT lithologic logs were integrated with previous subsurface soil ' descriptions to construct the subsurface geologic model The site stratigraphy is composed predominantly of fine-grained soil consisting of silt, clayey silt, silty clay, and clay, with the exception of five significant sand lenses, or layers The sand intervals are composed of sandy silt, Advanced GeoEnvironmental,Inc I