ARCHIVED REPORTS_XR0010756 - Laserfiche WebLink

Home Browse Search

I r16 September 2004 i AGE-NC Project No 97-0249 IPage 2of8 At the request of the CRWQCB, ground water monitoring events performed at the Three B's Truck Plaza site and the Flag City Chevron site (6421 Capitol Avenue) have been coordinated to occur concurrently, the Flag City Chevron ground water momtonng and analytical results are included in ' Appendix A ' 2 1 WELL MONITORING AND EVACUATION On 14 June 2004, depth to ground water was measured in each well from the top of the well casing to the nearest 0 01-foot utilizing a SoIinst water level meter On 15 and 16 June 2004, approximately 51/4 to 7 gallons of ground water (a minimum of three ' casing-water volumes per well)were evacuated(purged)from single-level monitoring wells MW-1 through MW-6 utilizing dedicated, disposable polyethylene bailers Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using ' an Oakton water analyzer Field data and logs are provided in Appendix B Purged ground water was containerized in 55-gallon drums and stored on-site in an area lacking general public access lie On 15 and 16 June 2004, multi-level monitoring wells MW-7 through MW-12 were purged by lowering and raising a 3/8-Inch outer diameter, length-discrete polyethylene hose equipped with a ' ball-valve water tip through the top chambers into the specific water-charged screened section A Watera-Hydro-Lift H pump equipped with a mechanical arm was utilized to surge each well with a polyethylene hose Approximately 1/2 to 4%2 gallons of ground water (a minimum of three casing- water volumes per well) were purged from each well Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using the Oakton water analyzer Field data and logs are included in Appendix B Multi-level well purged ground water was ' transferred to 55-gallon drums and stored on-site in an area lacking general public access ' 2 2 GROUND WATER SAMPLING After each well was purged,ground water levels were measured to venfy the amount of ground water ' recharge Upon achieving at least 80% ground water recharge, samples were collected from wells MW-1 through MW-12 utilizing the dedicated, disposable bailers or the above referenced Watera Hydro-Lift II pump system Ground water samples were transferred into 40-ml EPA-approved ' volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample preservative and 1-liter amber bottles without sample preservative Care was taken to ensure that visible air bubbles were not present in the vials after filling and capping Ground water sample containers were labeled with the well designation, date, time, and sampler's initials ' Advanced GeoEnvironmental,Inc I