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¢0t0 tcit 7'echnics1 tC Pa e 2 <br /> G g g <br /> Groundwater Momtonng Report <br /> Project No 662 2 <br /> September 12,2001 <br /> rA groundwater gradient was calculated for the August 2001 monitoring event and found the <br /> groundwater to be flowing N83°E at 0 0027 ft/ft Groundwater elevation and gradient data <br /> are summarized in Table 1, Appendix A Gradient direction is shown on Figure 2 Gradient <br /> Map, and Figure 3 Groundwater Gradient Rose Diagram <br /> r12 Groundwater Sampling Procedure <br /> On August 3, 2001, 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 '/z 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 /> 13 Laboratory Analyses <br /> r <br />