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Geo(orcal?echnics inc Page 2 <br /> Groundwater Monitoring Report <br /> Project No 507 2 <br /> November 6, 2000 <br /> ' A groundwater gradient was calculated for the event and found to be flowing N35°E at 0 003 <br /> ft/ft Gradient direction for the monitoring event is shown in Figure 2 The groundwater <br /> ' elevation data is summarized in Table 1, Appendix A <br /> 1.2 Groundwater Sampling Procedure <br /> ' On September 26, 2000, Don Light of Del-Tech mobilized to the site to conduct groundwater <br /> monitoring of the eight existing monitoring wells <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 %" tubing Purging continued until the temperature, conductivity, and pH of <br /> 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 a foam holder 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 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 /> All water purged from each monitoring well and not used as a sample was placed in a 55 <br /> gallon DOT approved container These drums were properly labeled and will be stored on _ <br />' site until their proper disposition can be arranged <br /> Groundwater monitoring field logs are included in Appendix C <br />' 1.3 Laboratory Analyses <br /> The groundwater samples collected on September 26, 2000 were delivered to Sherwood Lab <br /> 0 <br /> (Department of Health Services Certification No 1400), of Hilmar, California, for analysis <br />