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A S S O C I A T E S I N C <br /> ' ionization detection meter (FID) was used as a field-screening device for the detection of <br /> petroleum hydrocarbon vapors in drill cuttings. <br /> Groundwater was initially encountered at approximately 45 ft. bgs during drilling activities. A <br /> grab groundwater sample was subsequently collected from the soil boring using a Hydropunch® <br /> ' groundwater-sampling tool. The HydropunchO tool was advanced from 45 ft. to 49 ft. where the <br /> screen was exposed to the formation. Following the retrieval of the water sample, groundwater <br /> stabilized at approximately 36 ft. bgs. <br /> ' Field observations (i.e. odor, discoloration, FID readings) indicated that groundwater and soil <br /> had been impacted by petroleum hydrocarbons to a depth of at least 45 ft. bgs. In order to <br /> ' determine the vertical extent of contamination in the most cost-effective manner, the soil boring <br /> was further advanced to a total completion depth of 66.5 ft. bgs where field observations <br /> suggested the vertical extent of the petroleum hydrocarbons had been realized. Ms. Carol Oz of <br /> ' PHSIEHD concurred with the decision in the field to advance the boring beyond the initial <br /> anticipated depth of 45 ft. in an attempt to determine the vertical extent of petroleum <br /> hydrocarbons in the subsurface. <br /> Followingsoil and groundwater sample collection the boring was be backfilled with rout to the <br /> g p � g g <br /> surface. All drill cuttings were stored on site in 55-gallon drums. <br /> 2.2 Soil Sample Analysis <br /> ' Selected soil samples were placed on ice and transported under chain-of-custody to State- <br /> certified Argon Laboratories Inc. (FLAP Cert. No. 2358) in Ceres, California for analysis. All <br /> soil samples were analyzed for TPHg by EPA method 8015M, BTEX by EPA method 8020, and <br /> fuel oxygenates by EPA method 8260. The analytical results for soil samples are summarized in <br /> Table 1. Laboratory data sheets and chain-of-custody documentation are included in Appendix <br /> ' B. <br /> Ms. Carol Oz of PHSIEHD was consulted regarding which soil samples were to be submitted to <br /> ' the laboratory for analysis. The soil samples were selected based on based on field observations <br /> and previous analytical data. <br /> 2.3 Groundwater Sampling and Analysis <br /> ' The groundwater sample was analyzed by Argon for TPHg, BTEX, and oxygenate fuel additives. <br /> Groundwater analytical results are summarized in Table 2, and laboratory data sheets are <br /> presented in Appendix B. <br /> wA92054.000IlreportslsumsV.doc 3 <br />