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G"Iogkal Teckxics lnc. Page 3 <br /> Groundwater Monitoring Report <br /> Project No. 989.2 <br /> January 21,2002 <br /> ' 2.0 GROUNDWATER MONITORING <br /> ' 2.1 Groundwater Sampling <br /> On December 11, 2001, Del-Tech Geotechnical Support personnel arrived on-site, opened <br /> ' the wells, and measured the depth to water with an electrically actuated sounding tape. The <br /> water level reading was recorded to an accuracy of 0.01 foot. If free-floating product were <br /> suspected, a clear disposable bailer would have been used to gauge the interface. No <br /> ' floating product was observed during this sampling event. <br /> ' Stagnant water in the well casing was purged using a centrifugal pump with dedicated <br /> tubing. The rate of well purging was monitored. The wells were purged of at least three <br /> casing volumes and until the groundwater parameters (temperature, conductivity, and pH) <br /> ' had stabilized (Appendix B) indicating that water, representative of actual aquifer <br /> conditions, were entering the well. Groundwater parameter stabilization was characterized <br /> by three successive readings within 10%. <br /> ' Before a sample was collected, the well's water level was allowed to recharge to at least <br /> 80% of its initial level. All water removed from the monitoring well and not used as a <br /> sample, was placed in a 55-gallon DOT approved container that is properly labeled and <br /> temporarily stored on-site. <br /> I <br /> ' The technician using dedicated waterra pump and tubing collected the samples. The water <br /> was slowly decanted into 40-m1 VOA vials preserved with hydrochloric acid. Extreme care <br /> was exercised while collecting samples to prevent agitation. All samples were checked for <br /> headspace bubbles, labeled, inserted into foam holders and placed in an ice chest cooled to <br /> 4°C for transport to the laboratory. <br /> ' The sampling technician wore disposable gloves while collecting all samples. <br /> ' A chain of custody document, listing all samples collected and their intended analyses, <br /> accompanied the samples from field to the laboratory, thereby providing a means to track <br /> their movement and ensure their integrity. <br /> ' 2.2 Laboratory Analyses <br /> The groundwater samples collected on December 11, 2001 were delivered to Sherwood <br /> Labs (Department of Health Services Certification No. 1400), of Hilmar, California, for the <br /> following analysis: <br /> I <br /> i <br />