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' Geo(vgcca(7ec&ucs Inc Page 2 <br /> Groundwater Monitoring Report <br /> ' Project No 662 2 <br /> July 27,2000 <br /> A groundwater gradient was calculated for the June 16, 2000 groundwater monitoring event <br /> and found to be flowing N81°E at 0 0035 ft/ft Groundwater elevation and gradient data is <br /> ' summarized in Table 1, Appendix A Gradient direction is shown on Figure 2 Gradient <br /> Map <br /> ' 1.2 Groundwater Sampling Procedure <br /> On June 16, 2000 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 attempted 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 '/2 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 /> Iice chest cooled to VC 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 collect <br /> 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 /> i <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 at-ranged <br /> ' Groundwater monitoring field logs are included in Appendix C <br />