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Purdom&Bettencourt Page 2 <br /> Soil&Groundwater Investigation <br /> Project No. 959.2 <br /> 1.. July 12,2001 <br /> 16w selected from either the capillary fringe or from a shallower depth if contamination is <br /> detectable in field observations. <br /> Groundwater Grab Sampling <br /> Upon reaching the capillary fringe in each borehole, a hydropunch-type sampling tool will <br /> ` be advanced into the groundwater and a groundwater sample will be collected from each <br /> borehole. The samples are collected from a mini stainless steel bailer and gently transferred <br /> into VOA vials (a ball check valve and tubing will be used if the bailer does not collect <br /> sufficient water to sample). The VOA vial is capped, inverted, tapped, and checked for <br /> headspace bubbles. The vial will be labeled and placed on ice for shipment to the <br /> .laboratory. Clean surgical gloves are worn at all times in handling of the sample and <br /> sampling equipment. The bailer is cleaned between uses with an Alconox solution and <br /> water rinse. <br /> Groundwater is expected to be approximately 20 feet below ground surface (bgs). If <br /> sufficient groundwater is not present at 20 feet bgs, the drill rods will be advanced an <br /> additional five feet to 25 feet bgs (this will increase project costs). <br /> 2.2 Soil Laboratory Analyses <br /> One soil sample per borehole will be submitted to Sherwood Laboratories of Hilmar (State <br /> Certified Laboratory #1400) for the following analysis: <br /> • Benzene, toluene, ethylbenzene and xylene (BTEX)by EPA method 8020 <br /> • Methyl tertiary butyl ether(MTBE) by EPA method 602 <br /> • Gasoline range petroleum hydrocarbons (TPH-G)by EPA method 5030/8015(m) <br /> The detection limits for these compounds are listed below. A Chain of Custody will be <br /> completed for all samples collected and tracked to ensure sample integrity. <br /> L• DetectionLimits: <br /> 03 (Ag/Kg) 3.0 50 i,uuu <br /> La 2.3 Groundwater Sample Analyses <br /> One groundwater sample from each borehole will be submitted to Sherwood Laboratories of <br /> Hilmar (State Certified Laboratory #1400) the following analysis: <br /> • Benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 602 <br /> • Oxygenates - MTBE, DIPE, ETBE, TAME & TBA by EPA method 8260 <br /> L. • Gasoline range petroleum hydrocarbons (TPH-Gas)by EPA method 5030/8015(m) <br /> The detection limits for these compounds are listed below. A Chain of Custody will be <br /> completed for all samples collected and tracked to ensure sample integrity. <br /> Detection' imus: 13TEX Oxygenates - <br /> V ater g L 0 <br /> r <br /> v <br />