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A <br /> �r <br /> A S S O C I A T E S I N C . <br /> held screened with a Photo ionization Detection (PID) meter, and one.soil sample from each of <br /> the borings will be submitted for laboratory analysis. Soil sample selection will be based on PID <br /> measurements and field:observations(i.e. odor and soil discoloration). <br /> One groundwater sample will be collected from each boring at the depth groundwater is first <br /> encountered, anticipated to be approximately 6 feet bgs. A Geoprobe®R .Screen Point 15 <br /> Groundwater Sampler will be threaded onto the leading enol of the Geoprobe(5 when the <br /> groundwater is encountered. While the sampler is advanced, O-ring seals and an expendable <br /> drive point will provide a watertight system to ensure sample integrity. <br /> When the tool has been advanced to the desired depth, extension rods will be sent downhole to <br /> brace the bottom of the sample screen as the tool casing is retracted. When the casing is <br /> retracted, up to 41-inches of screen with slot sizes of 0.004 inches will be exposed. Teflon <br /> tubing with a check valve attached to one end will be inserted down the casing until it is <br /> immersed in groundwater. Water will then be pumped through the tubing and to the ground <br /> surface by oscillating the tubing up and down. . <br /> Following soil and groundwater sample collection, the borin's will be bacl<filled with neat- <br /> cement <br /> eatcement grout to the ground surface. Drill cuttings, if any, will be stored on-site in a 5-gallon <br /> container pending laboratory results. <br /> Sample Analvsis <br /> The selected soil and groundwater samples from the CPT and Geoprobet® borings will be <br /> immediately placed in a cooler with ice and delivered under chain-of-custody documentation to a <br /> State-certified analytical laboratory. Soil samples will be analyzed for TPHQ by EPA Method <br /> 8015B; benzene, toluene, ethyl-benzene, and xylenes (BTEX) by EPA Method 8021B; and <br /> MTBE, tertiary-amyl-methyl ether (TAME), 1,2-dibromoethane (EDB), 1,2-dichloroethane (1,2- <br /> DCA), di-isopropyl ether (RIPE), ethyl-tertiary-butyl. ether (ETBE), tertiary-butanol (TBA), <br /> ethanol (etOH), and methanol (meOH) by EPA Method 8260B. <br /> Summary Report Preparation <br /> Upon completion of the soil boring installation, a Summary Report will be prepared and will <br /> include a description of site activities and an assessment of the extent and impact of the residual <br /> hydrocarbons. <br /> All work described in this workplan will be performed under the direction .of a California <br /> Registered Geologist or Professional Engineer. All work will be performed in accordance with <br /> ATC's Site-specific Health,and Safety Plan (HASP) contained in Attachment 1 and Quality <br /> Control/Quality Assurance Plan contained in Attachment 2.' <br /> s Aenviromentai\2.SS47\3;\reports\wkp.doc 4 <br />