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' Former Manna Pro Site Page 4 <br /> Quarterly Groundwater Monitoring Report <br />' Project No 207 2 <br /> 12 November 1999 <br />' 3.0 GROUNDWATER MONITORING <br />' The following sections describe the procedures associated with the completion of <br /> groundwater monitoring at the site along with documenting the disposal of the <br /> well purge water associated with groundwater monitoring activity <br />' 3.1 Groundwater Sample Collection <br />' On 7 October 1999, Del-Tech Geotechnical Services of Oakdale, CA mobilized to <br /> the site to complete groundwater monitoring The groundwater monitoring <br /> procedure was as follows Upon arrival, each well was opened and the water <br /> Ilevel allowed to equilibrate As each well was opened, and prior to taking the <br /> depth to groundwater measurement, a PID organic vapor meter was used to <br /> screen for VOC's in the head space of the wells which were to be sampled The <br /> depth to groundwater was then measured by lowering an electronically actuated <br /> air / 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 B) A careful notation was made of the depth to groundwater as <br /> measured by the device No measurable free product was observed in the wells <br /> Each well to be sampled was pumped by inserting a Grundfos or similar <br /> submersible pump into the well and lowering it to bottom Well water was <br /> containerized in 55 gallon, DOT approved polyethylene drums, properly labeled, <br /> and temporarily stored on-site The rate of well purging was monitored, and <br /> each well was purged of at least three casing volumes or until the groundwater <br />' parameters (temperature, conductivity, and pH) had stabilized indicating that <br /> water representative of actual aquifer conditions was entering the well <br /> Groundwater parameter stabilization was characterized by three successive <br />' readings within 10 percent After the wells had been allowed to recharge to at <br /> least 80 percent of their original volume, samples were collected from them <br />' using methods described below <br /> A stainless steel bailer belayed on a clean stainless steel line was used to collect <br /> each sample Bailer cleanliness was verified by collecting a bailer blank <br /> (pouring distilled water through the bailer and collecting it in a VOA vial) prior <br /> to collecting the analytical sample Before, and in between uses, all sampling <br /> equipment was washed using a portable steam cleaner Disposable gloves were <br /> worn by the sampling technician while collecting all samples The gloves were <br /> changed between the collection of each sample to reduce the potential for cross- <br /> contamination <br /> 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br /> 1 <br />