ARCHIVED REPORTS XR0002712 - Laserfiche WebLink

Home Browse Search

08 October 2003 AGE-NC Project No. 98-0504 Page 5 of 7 Then a dedicated, inertial Waterra pump was used to remove 20 gallons of water from the wells. Temperature,pH and conductivity of the purged water were measured at one-gallon intervals using an Oakton water analyzer during purging; the values had generally stabilized by the end of the purging process (Appendix Q. Purged water was stored on-site in 55-gallon, Department of Transportation-approved drums. AGE surveyed a reference point on the top of each ground water monitoring well casing at the site to the nearest 0.01-foot relative local rnonitoringwells from the subsurface investigation at 348 West Harding Way and against the City of Stockton Bench Mark No. HS0391, at 14.47 feet above mean sea level (MSL) (Appendix Q. 3.5. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Ground water samples were collected from the monitoring wells using disposable polyethylene bailers; these bailers were disposed of after one use and require no decontaminating, thereby minimizing cross contamination due to sampling devices. Each water sample was transferred into Mthree 40-m1 EPA-approved volatile organic analysis (VOA) vials containing 0.5 ml 18% HCl as a sample preservative.After collection,the samples were labeled and placed in a chilled container for transportation under chain-of-custody to Cal Tech Environmental Laboratory(CTEL), a California Department of Health Services-certified Laboratory in Paramount, California. Each sample was , analyzed for: • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015 Modified; • Benzene,toluene,ethylbenzene and total xylenes(BTEX)in accordance with EPA Method 8260B; and Fuel additive-compounds, including di-isopropyl ether(RIPE), ethyl-tertiary- butyl ether(ETBE),methyl-tertiary-butyl ether(MTBE),tertiary-amyl methyl ether(TAME), and t-butyl alcohol (TBA), 1,2-dichloroethane (1,2-DCA), 1,2-dibromoethane (EDB), ethanol and methanol in accordance with EPA Method 8260B. 4.0. FINDINGS Ground water elevation, flow direction, and gradient were determined from field data collected on 07 April 2003;the contaminant impact ground water was quantified by the laboratory analytical data. Advanced GeoEnvironmentai,Inc.