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' Former Manna Pro Site Page 3 <br /> Quarterly Groundwater Monitoring Report <br />' Project No 207 2 <br /> December 11., 2001 <br />' 2.0 GROUNDWATER MONITORING <br /> The following sections describe the procedures associated with the completion <br />' of groundwater monitoring and ancillary activities at the site <br />' 2.1 Groundwater Sample Collection <br /> On September 18, 2001, 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 <br /> was 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 dedicated Waterra pump or by <br /> inserting a submersible Grundfos pump into the well and lowering it to <br /> 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 <br />' casing volumes or until the groundwater parameters (temperature, <br /> conductivity, and pH) had stabilized indicating that water representative of <br /> actual aquifer conditions was entering the well Groundwater parameter <br /> stabilization was characterized by three successive readings within 10 percent <br /> After the wells had been allowed to recharge to at least 80 percent of their <br /> original volume, samples were collected from them using methods described <br />' below <br />' A stainless steel bailer belayed on a clean stainless steel line was used to <br /> collect each sample Bailer cleanliness was verified by collecting a bailer <br /> blank (pouring distilled water through the bailer and collecting it in a VOA <br />' vial) prior to collecting the analytical sample Before, and In between uses, all <br /> sampling equipment was washed using a portable steam cleaner Disposable j <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 /> 2937 Veneinan Ave,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br />