ARCHIVED REPORTS XR0001712 - Laserfiche WebLink

Home Browse Search

cr '� 19 July 2004 AGE-NC Project No 95-0109 Page 3 of 7 2 4 MONITORING WELL DEVELOPMENT AND SURVEY On 16 April 2004, monitoring wells MW-20,MW-21 and MW-22 were developed utilizing a steel bailer and a Waterra inertia pump equipped with hose bailer Ground water was purged from each monitoring well until ground water was visually sediment free Approximately 15 to 20 gallons of water were removed from each well Groundwater temperature,pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer Field sheets and data are included In Appendix B Purged water was stored on-site In properly labeled, 55-gallon DOT-approved drums On 30 April 2004,a Callforma-state-licensed survey engineer from Morrow Surveying surveyed the location and elevation at the top of the well casing of monitoring wells EW-1 and MW-1 through MW-22 Elevations were surveyed to the nearest 0 01-foot relative to NAVD 88 Location coordinates (x and y) were surveyed to the nearest 0 1-foot using coordinate datum NAD 83 The results of the monitoring well survey are contained In Table 1 The surveying report (Morrow Surveying) is presented in Appendix C 2 5 WELL MONITORING AND PURGE PROCEDURES On 19 April 2004, a Solmst water level meter was used to measure the depth to ground water to the nearest 0 01-foot In monitoring wells MW-20,MW-21 and MW-22 The ground water elevation In each well was calculated by subtracting the depth to ground water from the surveyed well casing elevation After water levels were measured,wells MW-20,MW-21 and MW-22 were purged using a Waterra Inertial Pump Approximately 6 0 gallons of water(a minimum of 3 casing-water volumes per well)were removed from the wells Temperature, pH and conductivity of the purge water were measured at regular purge-volume Intervals using an Oakton water analyzer and the readings were recorded on field logs Field data and work sheets are Included in Appendix D The purged water was containerized In 55-gallon DOT-approved drums and stored on-site On 26 June 2004,twenty three on-and off-site ground water wells were monitored for depth to water and fourteen monitoring wells (MW-7, MW-8, MW-9, MW-11, MW-12 and MW14 through MW-22) were purged and sampled A Solinst water level meter was used to measure the depth to ground water to the nearest 0 01-foot In all twenty-three wells relative to the tops of the well casings The ground water elevation In each well was calculated by subtracting the depth to ground water from the surveyed well casing elevation (Table 1) After water levels were measured, wells MW-7, MW-11, and MW-14, were purged using new disposable plastic bailers Wells MW-8,MW-9,MW-12 and MW-15 through MW-22 were purged using a Waterra Inertial Pump Advanced GeoEnvironmental,Inc