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r <br /> 2.0 GROUNDWATER MONITORING <br />' <br /> The followingu - <br /> s b sections describe the procedures associated with the <br /> completion of groundwater monitoring and ancillary activiLties at the site <br />' 2.1 Groundwater Sample Collection <br /> On December 19, 2003, Del-Tech Geotechnical Services of Oakdale, CA <br />' mobilized to the site to complete groundwater monitoring The groundwater <br /> monitoring procedure was as follows Upon arrival, each well was opened and <br /> the water level allowed to equilibrate As each well was opened, and prior to <br /> taking the depth to groundwater measurement, a PID organic vapor meter was <br /> used to screen for VOC's in the head space of the wells which were to be <br /> sampled The depth to groundwater was then measured by lowering an <br />' electronically actuated air / water interface detector suspended from a <br /> polyethylene measuring tape calibrated to the nearest 0 01 foot (see <br /> groundwater monitoring data sheets in Appendix B) A careful notation was <br />' made of the depth to groundwater as measured by the device No measurable <br /> free product was observed in the wells <br />' Each well to be sampled was pumped with a Waterra pump with dedicated vinyl <br /> tubing Well water was containexzed in 55-gallon, DOT approved polyethylene <br />'. drums, properly labeled, and temporarily stored on-site The rate of well <br /> purging was monitored, and each well was purged of at least three casing <br /> volumes or until the groundwater parameters (temperature, conductivity, and <br />' pH) had stabilized indicating that water representative of actual aquifer <br /> conditions was entering the well Groundwater parameter stabilization was <br /> characterized by three successive readings within 10 percent After the wells <br />' had been allowed to recharge to at least 80 percent of their original volume, <br /> samples were collected from them using methods described below <br />' Wells purged with a Wattera pump were sampled directly from the dedicated <br /> tubing Before, and in between uses, all re-usable sampling equipment was <br />' washed using a portable steam cleaner Disposable gloves were worn by the <br /> sampling technician while collecting all samples The gloves were changed <br /> between the collection of each sample to reduce the potential for cross- <br /> contamination <br /> Extreme care was exercised while collecting samples to prevent agitation of the <br /> water contained in the bailer Water samples were transferred from the bailer <br /> into 40 ml VOA vials preserved with hydrochloric (provided by the analytical <br /> laboratory) All samples were checked for head space bubbles, labeled, inserted <br /> into foam holders and placed in an ice chest cooled to 4°C for transport to the <br /> • laboratory <br /> 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br />