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= , <br /> 0ffll '` <br /> a+' 4gn <br /> Results of Initial Im-estigation and Work Plan <br /> i" o. 760, Lodiecember 18, 1990 <br /> ARCO Service Station N <br /> �y , CaliforniaCaliForru <br /> AGS 38048-4 <br /> as soil discoloration and obvious odor from the samples from borings B-1 through B-6 <br /> Samples taken from borings B-7 and 13-8 exhibited no subjective evidence of Petroleum <br /> 0 hydrocarbons and produced no positive PID readings. The geologist iiiitiated Chain of <br /> Custody Records which accompanied the samples to the analytical laboratories. Copies of <br /> those documents are in Appendix B. <br /> 0 Borings B-1 through B-3 were drilled beyond subjective evidence <br /> l at the request <br /> wast <br /> of ARCO because hydrocarbon compounds were detected using the PIDeA boring was not <br /> drilled north of the former cavity as discussed in the April 23,1990,work plan(AGS Re ort <br /> ® 38048-3W) because power lines obstructed the drill rig. p <br /> Borings B-1 and B-2 were terminated at 60 feet below grade,and boring B-3 was terminated <br /> at 25-1/2 feet below grade. Borings B-4, B-S and 13-6 were terminated when two <br /> consecutive PID readings (taken at 5-foot intervals) were 50 <br /> (pPmv) or less. Borings B-4, B-5 and B-6 were terminates, at 26 b1 r million by volume <br /> � and 31 feet below � <br /> ;rade,respectively. Borings B-7 and B-8 were terminated at 21 feet below grade. Ground <br /> ® water was encountered in borings B-1 and B-2 at Sfeet below grade but was <br /> encountered in borings B-4 through B-8 not <br /> ® <br /> The borings were backfilled to the ground surface with a neat cement sIu <br /> generated during drilling were placed on and covered with plastic sheeting <br /> n3': Cu tii ngs <br /> site. Four soil samples were collected from the drill cuttings and compoand <br /> dleft <br /> t the e <br /> sample for laboratory analyses. In addition. and at the request of ARCO, the drill cutting <br /> ® samples generated during the October : <br /> Facility in 990 drilling event were, submitted to the GSX <br /> Lokem Buttonwillow, California, for analysis to establish a profile for soil <br /> disposal at a later date. <br /> S <br /> A,Op/ied GeoSystems -- <br /> 4c <br />