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CGealog"lrechmcsla Page 7 <br /> In Situ Remediation <br /> Pilot Test Work Plan <br /> Project No 507 2 <br /> June 10,2003 <br /> Soil and groundwater samples will be obtained during the Installation of three boreholes that <br /> ' will be discussed in section 3 2 below The samples will analyzed for <br /> Water <br /> ' • Benzene, Toluene, Ethyl benzene and Xylene(BTEX) by EPA method 8020 <br /> • Gasoline range petroleum hydrocarbons (TPH-G) by EPA method 5030/8015(m) <br /> • PH, EC <br /> • General Mineral [Alkalinity (CO3, HCO3), Ca, Mg, K, Na, Fe, Mn, Cu, Zn, SO4, Cl, <br /> TDS] <br /> ' SOII <br /> • Metals—Cr, Fe <br /> ' • Total Organic Carbon <br /> 3.1.1 Soil Core Sampling <br /> ' The GeoProbe advances a coring tool with a pneumatic hammer to a selected depth Upon <br /> reaching that depth the coring tool is opened and advanced further to fill the core barrel <br /> The soil sample enters an acetate cylinder contained in the coring tool Upon filling, the <br /> coring tool is pulled from the hole and the cylinder Is removed The cylinder is then cut and <br /> the selected interval is capped with Teflon end caps and placed on ice for shipment to the <br /> ' laboratory The remainder is used for geologic logging <br /> Up to four soil samples will be submitted to the laboratory for the analyses noted above in <br /> tsection 3 1 <br /> 3.1.2 Groundwater Sampling <br />' Groundwater samples will _ <br /> p be obtained from well MW 9 to obtain pre-pilot test groundwater <br />' chemistry The well will be purged of at least 3 well volumes of stagnant water using a <br /> Waterra pump, submersible pump or a stainless steel bailer Purging will continue until the <br /> temperature, conductivity, and pH of the ground water has stabilized (c10% variation <br /> between three readings) indicating that formation water representative of aquifer conditions <br /> is entering the well These water quality parameters are measured at intervals of each well <br /> volume purged <br /> A stainless steel bailer, disposable plastic bailer or dedicated Waters tubing will be used to <br /> collect each sample Care will be taken to minimize sample agitation from the initial filling <br />' of the bailer to the transfer of the sample to the VOA vials, plastic or glass amber liter <br /> bottles Once the sample container is filled and capped, the bottle will be inverted, tapped, <br /> and checked for headspace bubbles The sample container is identified and labeled with a <br /> unique designation, inserted into foam holders and placed in an ice chest cooled to 4°C for <br /> transport to the laboratory <br />