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' Prepared this PSAR documenting work performed and <br /> analytical results . <br /> ' TPE conducted the drilling and borehole soil sampling in <br /> accordance with the California Regional Water Quality Control <br /> Board (CRWQCB) "Tri-Regional Board Staff Recommendations for <br /> ' Preliminary Evaluation and Investigation of Underground Tank <br /> Sites" , dated August 10, 1990 and Leaking Underground Fuel Tank <br /> Reference Manual (LUFT) , dated October, 1989. <br /> ' Details of the scope of work are presented below. <br /> 3 . 2 Soil Boring Investigation <br /> ' The following sections discuss soil boring and soil sampling and <br /> handling procedures, and results of chemical analyses. <br /> ' 3 . 2 . 1 Predrilling Activities <br /> ' Prior to drilling TPE obtained well installation permits from San <br /> Joaquin Department of Public Health Services, Environmental <br /> Health Division (see Appendix A) and visited the site to mark <br /> the proposed soil boring locations . In addition, Underground <br /> Service Alert (USA Digs) was notified so that participating <br /> underground utilities in the vicinity of the borings could be <br /> located and marked. <br /> 3 . 2 . 2 Soil Boring and Sampling Procedures , <br /> Three (3) groundwater monitoring wells were drilled and installed <br /> ' between June 8th and 9th, 1992 using a Mobile B-61 truck-mounted <br /> drill rig owned and operated by JCon Exploration, a State of <br /> California licensed water well driller (C-57 license #563305) . <br /> ' To prevent possible cross contamination between borings all bits, <br /> drill rod, and augers were steam cleaned prior to drilling each <br /> borehole. The monitoring well borings were advanced with 8-inch <br /> ' O.D. hollow stem augers and subsequently enlarged with 10-inch <br /> O.D. hollow stem augers. <br /> Representative soil samples were collected for stratigraphic and <br /> ' chemical characterization at approximately 5-foot or less depth <br /> intervals, or at changes in lithology _ The samples were obtained <br /> by advancing a California split-spoon sampler, equipped with <br /> three 2-inch diameter X 6-.inch long brass tube liners, into the <br /> undisturbed soil beyond the tip of the' auger. A 140 pound safety <br /> hammer with a 30-inch drop was used to advance the sampler. The <br /> sampling equipment was cleaned before each sampling episode by <br /> ' washing in a trisodium phosphatelsolution and rinsing ,initap , <br /> water, and then distilled water. ,IAiTPE California Registered, <br /> geologist logged each borehole , and visually classified all soil <br /> 1 samples according to the Unified Soil Classification System. ' ' <br /> Boring logs depicting the subsurface lithologies at each boring <br /> 3 i <br /> ' II <br /> f I <br />