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i Bink o1S1ock1on Cuitez Lumbet Site Page 3 Quaiteily Gtomidwatei Monitoring Repoi t Pioject No 102 2 AugLlSt 19 2002 2 0 GROUNDWATER MONIT,)RING The following sections describe the procedures associated with the completion of gioundwatei monitoring at the site along with documenting the disposal of the well purge water associated with gioundwatei monitotrng activity 21 Groundwater Sample Collection On June 17, 2002, Del-Tech Geon { hnrcal F>er vices of Oakdale, CA mobilized to the site to complete groundwat( P mon�toi rng The gioundwatei monitoring procedure was as follows Upon oo rival each well was opened and the water level allowed to equilibrate As -,wh weh was opened, and prior to taking the depth to gioundwatei measutement, a PID organic vapor meter was used to ' scieen for VOC's in the head space of the well The depth to groundwater was then measured by lowering an electronically actuated aii / water interface detector suspended from a polvethylene measuiing tape calibrated to the neatest 0 01 foot (see gioundwalei monrt(,rrng data sheets to Appendix B) A careful notation made of the depth to ,found,-Niter as measured by the device No . measurable flee, product was observed in the wells Each well was pumped with a .odicat ed Wattera pump of by insetting a submersible pump into the well and lowering it to bottom Well water was containerized in 55-gallon DOT approved polyethylene drums, properly labeled, and temporarily stored on-site The rate of well purging was monitored, and each well was purged of at least three casing volumes or until the groundwater parameters (temperature, conductivity, and pH) had stabilized indicating that water representative of actual iquifei conditions was entering the well Gtoundwatet parameter stabilrz,ltion was ehatactertzed by three successive readings within 10 percent After the wells had been allowed to recharge to at least 80 percent of their original volumo, samples were collected fiom them using methods descr rbed below A stainless steel bailer belayed on a clean stainless steel line was used to collect each sample Batley cleanliness was verified by collecting a bailer blank (pouting distilled water through the bailer and collecting it in a VOA vial) prior to collecting the analytical sample Before and in between uses, all sampling equipment was washed using a portable team cleaner Disposable gloves were worn by the sampling technician while collecting all samples The gloves were changed between the collection of each sample to reduce the potential for cross- contamination ' 2937 Veneman Ave #13240 - n l Inc Phone 209 569-0293 Geo Phase Envrronme to ( ) ' Mode'ito, CA 95356 Fax (209) 569-0293