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Project No 034-98081 <br /> Appendix B <br /> METHODOLOGY <br /> The methods used to accomplish the purpose and scope of the August 11, 1998 additional site assessment <br /> are listed below The assessment activities were accomplished in accordance with the Regional Water <br /> Quality Control Board (RWQCB) Tri-Regional Board guidelines and the requirements listed in the <br />' "Recommendations for Preliminary Investigation and Evaluation of Underground Storage Tank Sites " <br /> A copy of the workplan was submitted to the SJCEHD for review and written approval before <br /> commencing the field investigation <br /> August 11, 1998 Phase I Assessment <br /> + A subsurface assessment permit was obtained from the SJCEHD <br /> • Before the commencement of drilling activities, Underground Services Alert <br /> (USA) was contacted to locate public underground utilities associated with USA <br /> Subscribers <br /> • Two 60-feet deep soil borings were advanced in the vicinity of the former <br /> gasoline UST by a truck-mounted drill rig Four additional 34 to 40-feet borings <br /> were advanced for the purpose of collecting grab groundwater samples at <br /> various locations around the site Soil boring locations are shown on Figure 2 <br /> + Soil boring samples were obtained for logging purposes at five feet intervals, <br /> beginning at 5 feet bgs Soils were logged in accordance with the Unified Soil <br /> Classification System <br /> • Sampling was conducted by means of a split-spoon sampler containing a 2-inch <br /> diameter brass sleeve <br /> + Sampling was conducted in accordance with the guidelines published by the <br /> Regional Water Quality Control Board (RWQCB) <br />' + During the drilling process, soil samples were subjectively analyzed for odor and <br /> discoloration Additionally, soils were field screened with a portable <br /> photoionization detector (PID) The PID readings were recorded on soil boring <br /> logs The PID is a direct reading real-time analyzer capable of detecting most of <br /> the volatile hydrocarbon constituents present in the vapor phase of petroleum- <br /> affected soils <br /> • Following sample retrieval from the soil borings, Teflon® film was placed over <br /> both ends of each sleeve Each sleeve was sealed with tight fitting plastic caps <br /> that were secured with adhesiveless tape <br /> KRAZAN& ASSOCIATES, INC <br /> Offices Serving the Western United States <br /> 10.98081 SGS <br />