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May 4, 1993 Project No. EK-6032-2 <br /> ' Document No. 9305-4002.RPT <br /> headspace. The sleeve was then capped and the probe of the PID was inserted through a hole in <br /> the cap and into the headspace for analysis. The PID readings are recorded on the boring logs. <br /> ' The second sample sleeve was immediately sealed with Teflon®film,capped, and placed on ice at <br /> 40 C for transport to Sequoia Analytical, Inc., a California Department of Health Services (DOHS) <br /> ' certified laboratory. Chain of custody procedures were utilized for all samples collected. <br /> ' The sampling equipment was washed with TSP (tri-sodium phosphate) cleanser, pre-rinsed with <br /> tap water and then final rinsed with de-ionized water prior to sampling, between sample intervals, <br /> and between borings to minimize the possibility of cross-contamination. All drill cuttings were <br /> ' stockpiled on-site between layers of plastic sheeting until the laboratory analyses was performed. <br /> After drilling and sample collection, the borings were backfilled with a cement/bentonite slurry to <br /> ' seal the abandoned boreholes. The borings extending into groundwater were first sealed with <br /> approximately 2-3 feet of hydrated bentonite clay. The geologist prepared a log of the subsurface <br /> conditions encountered during drilling and classified the soils according to the Unified Soil <br /> ' Classification System. The boring Iogs are presented in Appendix A. <br /> ' LABORATORY ANALYSIS <br /> ' The soil and groundwater samples collected during this investigation were analyzed in the . <br /> following manner: <br /> ' Soil and groundwater samples from the two borings that were located on the <br /> northern property line, adjacent to Bloom's Auto Wrecking, were analyzed for the <br /> presence of total petroleum hydrocarbons as gasoline (TPHG) and diesel (TPHD) <br /> by EPA Method 8015, benzene, toluene, ethyl benzene, and xylenes (BTEX) by <br /> ' EPA Method 8020, and oil and grease (O&G) by EPA Method 413.2 (I.R.). The <br /> soil samples collected at a depth of 5 feet in each boring were composited at the <br /> ' laboratory into,one sample for analysis. The soil samples from a depth of 10 feet in <br /> each boring were also composited in a similar manner. In the deeper boring, the <br /> soil samples collected at approximate depths of 15, 20, 25, 30 and 35 feet were <br /> ' tested with a Photo Ionization Detector (PID) in the field and subsequently not <br /> submitted for laboratory analysis due to undetectable vapor readings. <br /> 4 <br /> 1 <br /> 4 <br /> 1 <br />