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Project No 014-95262 <br /> Appendix D <br /> lip Page No i <br /> INVESTIGATION METHODOLOGIES <br /> 1 All necessary permits were obtained from the San Joaquin County Environmental <br /> Health Division prior to the commencement of the investigation at the project site <br /> 2 An additional literature survey of published geologic and groundwater data in the <br /> vicinity of the project site was conducted in an attempt to fully characterize the <br /> conditions present <br /> 3 Prior to drilling, Underground Service Alert (USA) was contacted for <br /> identification of underground utilities Each boring location was carefully hand- <br /> probed to a depth of approximately five feet <br /> 4 Soil borings were drilled utilizing a truck-mounted drill rig equipped with <br /> continuous-flight hollow-stem auger Drilling fluids were not be used while <br /> advancing the borings <br /> 5 Soil samples were obtained for logging purposes in the borings at five foot <br /> intervals, beginning at grade Soils were logged in accordance with the Unified <br /> Soil Classification System <br /> i <br /> 6 Sampling was conducted by means of a split-spoon sampler containing three 6" <br /> long by 2" diameter brass sleeves <br />' 7 During the drilling process, soil was examined for visual evidence of <br />€ contamination Additionally, the soil was field screened with a portable <br /> photoionization detector (PID) The PID reading was used to aid in choosing <br /> samples for chemical analysis and will be noted on the drill logs The PID is a <br /> direct reading reaitune analyzer that is capable of detecting most of the volatile <br /> constituents present in the vapor phase of affected soils The PID that will be used <br /> for this investigation uses a 10 2 electron volt lamp and is calibrated using an iso- <br /> butyiene calibration gas <br /> S Following sample retrieval, Teflon film was placed over both ends of the tube <br /> Each tube was then capped with tight f tong plastic caps and secured by <br /> adhesiveless tape <br /> 9 Samples were labeled with the project number, sampler's initials, boring number, <br /> 1 and the tune and depth at which the sample was obtained <br /> 10 Following sample labeling, each sample was placed in a cooler chest with <br /> synthetic ice to limit the volatilization of any hydrocarbons present <br />' 11 Soil borings were back-filled using a cement/sand slurry place via tremae pipe <br /> 12 Selected soil samples from soil borings in the vicinity of the wastewater treatment <br /> facility were analyzed for one or more of the following electrical conductivity, <br /> l <br />' KRAZAN& ASSOCIATES, INC. <br /> Offices Serving the Western United States <br /> 95262 APD <br /> c <br />