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r Job No 4780200 Page 3 <br /> 3.0 FIELD INVESTIGATION <br /> 3.1 Soil Boring Advancement <br /> E2C1 Inc. visited the subject site on January 7, 1993. Also present were <br /> Spectrum Exploration of Stockton to perform drilling services, and Ms. Mary <br /> Meyes of the SJCPHS to observe the field operations. Boring and soil sampling <br /> were performed according to protocol presented in our workplan for this <br /> investigation dated December 23, 1992. A copy of this plan is included in <br /> Appendix B. <br /> Boring B2 was advanced in the vicinity of the former location of a 2,000-gallon, <br /> unleaded gasoline UST. Soil samples were collected from depths of 5, 10, 15 <br /> and 20 feet. During the advancement of the boring, a strong hydrocarbon odor <br /> was detected in the soil cuttings. The horizon at which the odor was detected <br /> was approximately 12 to 13 feet below ground surface (bgs). The soil cuttings <br /> from this horizon were found to be very wet, however, in-situ soil samples <br /> collected from 10 and 15 feet bgs were found to be damp to slightly moist (the <br /> potential significance of this zone is discussed in Section 4). Groundwater was <br /> not encountered in B2 or any of the other borings However, while drilling B2, <br /> the cuttings were found to be saturated from a corresponding depth of <br /> approximately 12 to 13 feet below ground surface (bgs). The cuttings from <br /> this saturated zone had a very strong hydrocarbon odor. <br /> After the completion of boring B2, borings B6, B5 and B4 were advanced to <br /> depths of 20, 10 and 4 feet respectively. Soil samples were collected at 5-foot <br /> intervals during the boring advancement (with the exception of B4 where the <br /> sample was collected at the bottom of the completed boring 4 feet bgs). <br /> During the advancement of these remaining borings, no hydrocarbon odors <br /> were detected. All borings were backfilled with a cement grout under the <br /> observation of Ms. Mary Meyes of the SJCPHS. All cuttings generated from <br /> the advancement of the borings were stockpiled adjacent to existing soil <br /> stockpiles on-site. <br /> EX, Inc January 29, 1993 <br />