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§eofo ca(Technw-s Inc Page 2 g Groundwater Monitoring Report Project No 662 2 February 17,2000 On February 11, 2000, Keith Spencer, licensed land surveyor, surveyed the top of casing elevations for the new wells The benchmark elevation was taken from N G S Monument M1413 A copy of the letter from Spencer Surveying is attached in Appendix D A groundwater gradient was calculated for the January 20, 2000 groundwater monitoring ' event and found to be flowing S17°E at 0 0036 ft/ft Data is summarized in Table 1, Appendix A Gradient direction is shown on Figure 2 Gradient Map ' 1.2 Groundwater Sampling Procedure On January 20, 2000 Don Light of Del-Tech mobilized to the site to conduct a groundwater monitoring of the three existing monitoring wells on site ' Before sampling was attempted the wells were sounded for depth to water and then a clear disposable bailer was used to determine if floating product was present The wells were purged of at least three well volumes of stagnant water using a dedicated Waterra check-ball ' assembly and '/2 inch tubing Purging continued until the temperature, conductivity, and pH of the groundwater stabilized (<10% variation between three readings) indicating that formation water representative of aquifer conditions was entering the wells These water quality parameters were measured at intervals of each well volume purged Once purging was complete, a water sample was collected from the Waterra tube Care was ' taken to minimize sample agitation Once the sample container was filled and capped, the bottle was inverted, tapped, and checked for headspace bubbles The sample container was identified and labeled with a unique designation, inserted into foam holders and placed in an ice chest cooled to VC for transport to the laboratory ' All non-disposable sampling equipment was decontaminated using a hot water washer and detergent before and between uses Disposable gloves were used by the technician to collect all samples and were changed with each sample collection ' A chain of custody document, listing all samples collected, accompanied the samples from field to laboratory, thereby providing a means to track their movement and insure their ' integrity All water purged from each monitoring well and not used as a sample, was placed in a 55 ' gallon DOT approved container, properly labeled and stored on site until its proper disposition can be arranged ' Groundwater monitoring field logs are included in Appendix C