ARCHIVED REPORTS_XR0008836 - Laserfiche WebLink

Home Browse Search

I 25 April 2005 S AGE-NC Project No 00-0696 ' Page 2 of 4 ' Temperature, pH, and conductivity of the purged water were measured at regular intervals for stabilization using an Oakton water analyzer Field sheets and data are provided in Appendix C Purged water was containerized in properly labeled,Department of Transportation(DOT)-approved ' 55-gallon drums and stored on-site pending proper disposal ' 23 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Ground water samples were collected from each well using the disposable bailers after allowing the wells to achieve a minimum 80% recovery of the pre-purge water volume Each water sample was transferred into three laboratory-supplied, 40-milliliter (ml) volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid solution as a sample preservative, and one 1-liter amber bottle without preservative After collection, the samples were properly labeled, placed in a chilled container,and transported under chain of custody to Cal Tech Environmental Laboratories(CTEL), a State of California Department of Health Services (DHS)-certified analytical laboratory, for analysis The samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, respectively) in accordance with EPA Method 8015M, and Benzene,toluene,ethylbenzene,and total xylenes(BTEX)and fuel additives methyl tertiary- butyl ether(MTBE),tertiary-butyl alcohol(TBA), di-isopropyl ether(DIPS), ethyl tertiary- butyl ether(ETBE),tertiary-amyl methyl ether(TAME), 1,2-dibromoethane(EDB),and 1,2- dichloroethane (1,2-DCA) in accordance with EPA Method 8260B 3.0. FINDINGS Ground water elevation and flow direction were inferred from field data, hydrocarbon impact to ground water was quantified by laboratory analysis of the ground water samples I3 1 GROUND WATER GRADIENT AND FLOW DIRECTION The elevation of ground water in each of the monitoring wells was calculated by subtracting the Idepths to ground water from the surveyed relative casing elevations (Table 1) Depths to ground water ranged from 3 82 feet(MW-4)to 4 97 feet(MW-1)below the tops of the well casings Ground water elevation at the site ranged from 16 58 feet(MW-2 and MW-4) to 17 29 feet(MW-3) below mean sea level (MSL), and averaged approximately 16 81 feet below MSL, indicating an increase Advanced GcoEnvironmental,Inc I