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1 Former Manna Pro Site Page 3 <br /> Quarterly Groundwater Monitoring Report <br /> Project No 207 2 <br /> February 15 2006 <br />' 2.0 GROUNDWATER MONITORING <br /> The following sub-sections describe the procedures associated with the J <br />' completion of groundwater monitoring and ancillary activities at the site <br /> 2.1 Groundwater Sample Collection <br />' On December 14 2005 Del-Tech Geotechnical Services ofk 1 <br /> Oa da e, A C <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 Waterra pump with dedicated <br /> vinyl tubing Well water was containerized in 55-gallon, DOT approved <br /> polyethylene drums, properly labeled, and temporarily stored on-site The <br />' rate of well purging was monitored, and each well was purged of at least three <br /> casing volumes or until the groundwater parameters (temperature, <br />' conductiviLty, and pH) stabilized indicating that water representative of actual <br /> aquifer condiitzons was entering the well Groundwater parameter <br /> stabihzation was characterized by three successive readings within 10 percent <br />' After the wells recharged 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 <br /> the water contained in the baler Water samples were transferred from the <br /> bailer into 40 ml VOA vials preserved with hydrochloric (provided by the <br /> 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 />