ARCHIVED REPORTS XR0001034 - Laserfiche WebLink

Home Browse Search

' CeoTagua[Techmcs Inc Page 2 Groundwater Monitoring Report Project No 507 2 April 14,2000 On February 15, 2000, Keith Spencer, licensed land surveyor, surveyed the top of casing elevations for the new wells The benchmark elevation was taken from NGS Monument ' T1413 A copy of the letter from Spencer Surveying is attached in Appendix D A groundwater gradient was calculated for the January 27, 2000 groundwater monitoring ' event and found to be flowing S45°W at 0 005 ft/ft On March 8, it was found to be flowing S43°W at 0 008 ft/ft Gradient directions for the two monitoring events are shown in Figures 2 and 3 Data is summarized in Table 1, Appendix A 1.2 Groundwater Sampling Procedure P g ' On January 27 and again on March 8, 2000, Don Light of Del-Tech mobilized to the site to conduct a groundwater monitoring of the eight existing monitoring wells 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" 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 a foam holder and placed in an ice chest cooled to 4°C 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 These drums were properly labeled and will be stored on site until their proper disposition can be arranged Groundwater monitoring field logs are included in Appendix C 1