Laserfiche WebLink
' Bank of Stockton-Cutter Lumber Site Page 3 <br /> Quarterly Groundwater Monitoring Report <br /> Project No 102 2 <br /> January 24,2001 <br />' 2.0 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 well purge <br /> water associated with groundwater monitoring activity <br />' 2.1 Groundwater Sample Collection <br />' On December 5, 2000, Del-Tech Geotechnical Services of Oakdale, CA mobilized to the site <br /> to complete groundwater monitoring The groundwater monitoring procedure was as <br /> follows Upon arrival, each well was opened and the water level allowed to equilibrate As <br />' each well was opened, and prior to taking the depth to groundwater measurement, a PID <br /> organic vapor meter was used to screen for VOC's in the head space of the well The depth <br /> to groundwater was then measured by lowering an electronically actuated air/water interface <br />' detector suspended from a polyethylene measuring tape calibrated to the nearest 0 01 foot <br /> (see groundwater monitoring data sheets in Appendix B) A careful notation made of the <br /> depth to groundwater as measured by the device No measurable free product was observed in <br />' the wells <br /> Each well was pumped by inserting a submersible pump into the well and lowering it to <br /> bottom Well water was containerized in 55 gallon DOT approved polyethylene drums, <br /> properly labeled, 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 parameters <br />' (temperature, conductivity, and pH) had stabilized indicating that water representative of <br /> actual aquifer conditions was entering the well Groundwater parameter stabilization was <br /> characterized by three successive readings within 10 percent After the wells had been <br />' allowed to recharge to at least 80 percent of their original volume, samples were collected <br /> from them using methods described below <br />' A stainless steel bailer belayed on a clean stainless steel line was used to collect each sample <br /> Bailer cleanliness was verified by collecting a bailer blank (pouring distilled water through <br />' the bailer and collecting it in a VOA vial) prior to collecting the analytical sample Before <br /> and in between uses, all sampling equipment was washed using a portable steam cleaner <br /> Disposable 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 potential for cross- <br /> contamination <br />' Extreme care was exercised while collecting samples to prevent agitation of the water <br /> contained in the bailer Water samples were transferred from the bailer into 40 ml VOA vials <br /> preserved with hydrochloric acid (provided by the analytical laboratory) All samples were <br />' checked for head space bubbles, labeled, inserted into foam holders and placed in an ice chest <br /> cooled to 4°C for transport to the laboratory <br /> 2937 Veneman Ave,#B240 Geo-Phase Environmental Inc Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209)569-0293 <br /> I <br />