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1 <br /> rwologkAITedkausInc. Page 2 <br /> Groundwater Monitoring Report <br /> Project No. 989.2 <br /> July 29,2002 <br /> 1.0 GROUNDWATER MONITORING <br /> ' 11 Groundwater Sampling <br /> On June 18, 2002, Del-Tech Geotechnical Support Service personnel arrived on-site, <br /> opened the wells and measured the depth to water with an electrically actuated sounding <br /> tape. The water level reading was recorded to an accuracy of 0.01 foot. If free-floating <br /> ' product had been suspected, a clear disposable bailer would have been used to gauge the <br /> interface. No floating product was observed during this sampling event. <br /> ' Stagnant water in the well casing was purged using a dedicated Waterra pump with <br /> dedicated tubing. The rate of well purging was monitored. The wells were purged of at <br /> least three casing volumes and until the groundwater parameters (temperature, conductivity <br /> ' and pH) had stabilized (Appendix B) indicating that water representative of actual aquifer <br /> conditions was entering the well. Groundwater parameter stabilization was characterized by <br /> three successive readings within 10%. <br /> ' Before <br /> a sample was collected, the water level in the well 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 into a 55-gallon DOT approved container that was properly labeled and <br /> temporarily stored on-site. <br /> ' The groundwater samples were obtained utilizing the dedicated Waterra pump. Extreme <br /> care was exercised while collecting samples to prevent agitation of the water moving in the <br /> ' pump tubing. Water samples were transferred from the pump tubing into 40-m1 VOA vials <br /> preserved with hydrochloric acid while minimizing sample aeration during transfer of the <br /> sample. All samples were checked for headspace bubbles, labeled, inserted into foam <br /> tholders and placed into a cooled ice chest 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 the field to the laboratory, thereby providing a means to <br /> track the movement of the samples and ensure their integrity. <br />