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r <br /> l <br /> r- r <br /> Immediately after soil sampling took place, an effort was made with the backhoe shovel to <br /> determine the extent of contamination that had occurred. The fillpipe end of the excavation <br /> was discolored gray in both the bottom and the sides of the excavation, indicating both a <br /> vertical and lateral flow of contaminants Gasoline leakage might have originated from the <br /> fuel pump or the vent pipe since no holes were visible in the tank itself and the vent pipe <br /> appeared to be loose when it was removed. The excavation was dug back 5 feet from the <br /> sidewall in the original tank excavation at the fill pipe end. The excavation was also extended <br /> to a depth of approximately 16 feet at this point to determine the vertical extent of the <br /> contaminants No visible improvement was apparent in soil conditions in either the vertical or <br /> lateral direction of soil contamination Therefore, in order to determine the extent of <br /> contamination, AEMC conducted a Soil Contamination Assessment in accordance with <br /> guidelines outlined by the San Joaquin Local Health District <br /> f <br /> • SOIL BORINGS (GASOLINE TANK EXCAVATION) <br /> E <br /> One (1) exploratory boring was continuously logged to a depth of 45 feet See Figure 5 for the <br /> location of the exploratory boring (EX-1) and sampling borehole locations See Appendix B <br /> xp ry <br /> for the boring logs from the exploratory boring and sampling boreholes <br /> Four (4) soil sampling boreholes were dnlled at Fabricare in the vicinity of the tank <br /> E <br /> excavation to determine the exact extent of soil contamination. Borehole drilling and <br /> sampling operations were conducted using a CME 55 dnll ng and hollow-stem auger All <br /> auger flytes were steam cleaned between bonngs to avoid cross contamination The <br /> boreholes were continuously logged for soil type, color, and any visible contamination <br /> Moisture content, plasticity and other information that was deemed pertinent was also <br /> ' r;corded <br /> Soil samples were collected at regular intervals using a modified California split spoon <br /> sampler fitted with three 2-inch x 6-inch internal brass liners The Modified California <br /> Page 14 <br /> i <br /> l <br />