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Geologicaf Tecluiics w Page 2 <br /> ' Groundwater Monitoring Report <br /> Project No 662 2 <br /> • July 2,2002 <br /> ' groundwater elevation on April 15 2002 was approximately 17 32 feet above MSL which <br /> is about 22 feet below ground surface <br /> A groundwater gradient was calculated for the event and the groundwater was found to flow <br /> ' N79°E at 0 0024 ft/ft Groundwater elevation and gradient data are summarized in Table 1, <br /> Appendix A Gradient direction is shown on Figure 2 Gradient Map, and Figure 3 <br /> Groundwater Gradient Rose Diagram <br /> ' 1.2 Groundwater Sampling Procedure <br /> On April 15, 2002, Don Light of Del-Tech mobilized to the site to conduct a groundwater <br /> monitoring of the three existing monitoring wells on site <br /> ' Before sampling was performed the wells were sounded for depth to water and then a clear <br /> disposable bailer was used to determine if floating product was present The wells were <br /> purged of at least three well volumes of stagnant water using a dedicated Waterra check-ball <br /> assembly and 'h inch tubing Purging continued until the temperature, conductivity, and pH <br /> of the groundwater stabilized (<10% variation between three readings) indicating that <br /> formation water representative of aquifer conditions was entering the wells These water <br /> quality parameters were measured at intervals of each well volume purged <br /> ' Once purging was complete, a water sample was collected from the Waterra tube Care was <br /> taken to minimize sample agitation Once the sample container was filled and capped, the <br /> bottle was inverted, tapped, and checked for headspace bubbles The sample container was <br /> ' identified and labeled with a unique designation, inserted into foam holders and placed in an <br /> ice chest cooled to 4°C for transport to the laboratory <br /> ' All non-disposable sampling equipment was decontaminated using a hot water washer and <br /> detergent before and between uses Disposable gloves were used by the technician to <br /> collect all samples and were changed with each sample collection <br /> A chain of custody document, listing all samples collected, accompanied the samples from <br /> field to laboratory, thereby providing a means to track their movement and insure their <br /> ' integrity <br /> All water purged from each monitoring well and not used as a sample, was placed in a 55 <br /> ' gallon DOT approved container, properly labeled and stored on site until its proper <br /> disposition can be arranged <br /> ' Groundwater monitoring field logs are included in Appendix C <br />