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24 December 2014 <br />AGE Project No. 14-3154 <br />Page 4 of 7 <br /> <br />Advanced GeoEnvironmental Inc. <br /> <br />cement grout from the total depth to surface grade. Borings advanced below the ground <br />water table were abandoned with grout utilizing tremie procedures. <br /> <br />Under inspection by the San Joaquin County Environmental Health Department <br />(SJCEHD), soil borings were backfilling with Portland type II cement from the total depth <br />to surface grade. <br /> <br /> <br />3.0. FINDINGS <br /> <br />Soil stratigraphy was determined from field data collected during advancement of the <br />soil borings; hydrocarbon and metals impact to soil was quantified by laboratory <br />analyses of the soil and groundwater samples. <br /> <br /> <br />3.1. STRATIGRAPHY <br /> <br />Based on the data collected from borings AB1 through AB21: <br /> <br />Generally, tan, brown to dark brown, silts and clays were generally encountered <br />between surface grade and approximately 15 feet bsg. Fine to coarse, well graded, <br />gravelly sands were encountered at depths between 15 feet and 20 feet bsg. Silt and <br />clay was observed in the deepest soil samples collected at 25 feet bsg. Saturated soil <br />was encountered from borings at depths of 15 feet bsg. <br /> <br />No hydrocarbon-like odors were observed in samples collected from borings. Organic <br />vapor was not detected from any soil samples collected from borings AB1 through AB21 <br />using a PID, beyond background values. During boring advancement field PID readings <br />did not detect organic vapors above 0 parts per million volume (ppmv), with the <br />exception of the five-foot sample at boring location AB18-5 (0.6 ppmv). <br /> <br />Boring logs are included in Appendix A. <br /> <br /> <br />3.2. FINDINGS <br /> <br />Constituents of concern were not reported at or above laboratory reporting limits in any <br />of the analyzed soil samples collected from the borings. Laboratory analytical results <br />are included in Appendix E. <br /> <br />A total of twenty-one (21) soil samples were analyzed from borings AB1 through AB7 for <br />the TPH-d/o constituents listed. A total of fifteen (15) soil samples were analyzed from <br />borings AB8 through AB21 for the TPH-gasoline, d/o constituents listed. Target analytes <br />for semi-volatile organic compounds quantified as fuel oil, were not detected in any of <br />the soil samples collected during the December 2014 investigation.