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Bank of Stockton- Cutter Lurnber Site Page 3 <br />' Quarterly Groundwater Monitoring Report <br /> Project No 102 2 <br /> • October 29,2003 <br />' 2.0 GROUNDWATER MONITORING <br />' The following sub-sections describe the procedures associated with the <br /> completion of groundwater monitoring at the site along with documenting the <br /> disposal of the well purge water associated with groundwater monitoring <br />' activity <br /> 2.1 Groundwater Sample Collection <br />' On September 22, 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 well The depth to <br />' groundwater was then measured by lowering an electronically actuated air / <br /> water interface detector suspended from a polyethylene measuring tape <br /> calibrated to the nearest 0 01 foot (see groundwater monitoring data sheets in <br /> Appendix lI) A careful notatiion made ei the depih Le gleunuwdi,e1 db medSuied <br /> by the device No measurable free product was observed in the wells <br />' • Each well was pumped with a Wattera pump and dedicated vinyl tubing lowered <br /> to bottom Well water was containerized in 55-gallon DOT approved <br /> polyethylene drums, properly labeled, and temporarily stored on-site The rate <br /> of well 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 had <br />' been allowed to recharge to at least 80 percent of their original volume, samples <br /> were collected from them using methods described below <br />' After purging was completed, the Wattera pump was used to produce a water <br /> sample directly into the sample containers Before and in between uses, all <br /> sampling equipment was washed using a portable steam cleaner Disposable <br />' gloves were worn by the sampling technician while collecting all samples The <br /> gloves were changed between the collection of each sample to reduce the <br /> potential for cross-contamination <br /> Extreme care was exercised while collecting samples to prevent agitation of the <br /> water while filling the sample containers Water samples were transferred from <br /> the bailer into 40 ml VOA vials preserved with hydrochloric acid (provided by <br /> the analytical laboratory) All samples were checked for head space bubbles, <br />' 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br /> 1 <br />