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Report-Soil and Groundwater Investigation Gateway Project,City of Stockton April 10,2000 �+ Page-5- bgs, significantly sandier soil (sandy clay and clayey sand) was present between those depth ranges. The La soil samples collected from GP2 between approximately 14 and 20 feet bgs appeared to be generally more sandy and wet than the soil in GP 1 between those depths. PID measurements of 7 and 5 ppm total organic vapors and moderate petroleum hydrocarbon odors were recorded for the field observation soil samples collected from GP2 at approximately 15.5 and 19.5 feet bgs, respectively. Petroleum Lo hydrocarbon odors were not noted and volatile organic vapors were not detected with the PID at or above the instrument detection Iimit of one ppm total organic vapors in the field observation soil samples collected from GP2 at approximately 11.5 and 29.5 feet bgs. Native soil appeared to be encountered in GP3 between approximately 3 and 4 feet bgs. Stiff, dense, clay, sandy clay and clayey sand were generally encountered from 4 feet bgs down to the total depth of the boring at approximately 28 feet bgs. The boring met refusal at approximately 28 feet bgs upon encountering very hard, dry clay. Similar to GPI and GP2, field observations generally indicated that although a very stiff clay was encountered in GP3 at approximately 8 and 24 feet bgs, significantly sandier soil (sandy clay and clayey sand) was present between those depths. A PID measurement of 5 ppm total organic vapors and a slight petroleum hydrocarbon odor were recorded for the field Lo observation soil sample collected from. GP3 at approximately 27.5 feet bgs. Petroleum hydrocarbon odors were not noted and volatile organic vapors were not detected with the PID at or above the LW instrument detection limit (one ppm total organic vapors) in the field observation soil samples collected ' from GP3 at approximately 7.5, 11.5, 15.5, 19.5 and 23.5 feet bgs. LN ' Native soil appeared to be encountered in GP4 at approximately 4 feet bgs. Clay and sandy clay were LM encountered down to the total depth of the boring at approximately 32 feet bgs. Similar to GPI through GP3, field observations generally indicated that although stiff clay was encountered in GP4 between L' approximately 8 to 12 feet bgs and again from 28 to 32 feet bgs, sandy clay was generally present between those depth ranges. PID measurement of 3, 0.6, 1.8, and 1.0 ppm total organic vapors were L' recorded for the field observation soil samples collected from GP4 at approximately 19.5, 23.5, 27.5 and 31.5 feet bgs. It should be noted that PID readings that are just above the instrument detection limit of I L' ppm total organic vapors may not be representative of actual petroleum hydrocarbon concentrations in 0 Lo Lo CONDOR