ARCHIVED REPORTS_XR0003266 - Laserfiche WebLink

Home Browse Search

' 05 February 2001 AGE-NC Project No. 98-0468' ; ' Page 3 of 7 2.4. LABORATORY ANALYSES OF SOIL SAMPLES Selected,soil samples were analyzed for the following constituents: , ' Total petroleum'hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015 Modified; ' Volatile aromatic compounds-benzene,toluene,ethylbenzene and total xylenes(BTEX) and screened for methyl-tertiary butyl ether(MTBE)in accordance with EPA Method 8020 and Oxygenated fuel additives - di-isopropyl.ether (DIPE); ethyl tertiary hutyl ether (ETBE), . MTBE, tertiary butyl alcohol (TBA) and tertiary amyl methyl-ethe'r (TAME), methanol, ethanol, ethyl-dibromide (EDB) and 1,2-dichloroethane(1,27DCA)"in accordance with EPA ' Method 8260 Modified. ' 2.5. MONITORING WELL PURGE PROCEDURES On 30 November 2000, a ground water monitoring event'was conducted at the site. The ground 1 water monitoring activiiies.,included the measurement of ground water levels and collection.of ground water samples from site monitoring wells MW-1 through MW-8. A solinst water level meter ' was used to measure the depth to ground water in each well relative to the tops of the well casings. After ground water depth measurements were collected, monitoring wells MW-3-through MW-5 n ' were purged using a per-cleaned, two-stage submersible pump. Wells MW-6 through MW-8 were bailed with asteel-bailer and pre-purged an excessive amount in an attempt to purge fine sediments and silts from the wells. Up to 20 gallons of water were evacuated from monitoring wells MW-7 , ' and MW-8, and 40 gallons of water were evacuated from monitoring well MW-6. Approximately- 3 to 10 gallons of water were evacuated from each of the other monitoring wells (a minimum three casing.water volumes), as appropriate for each well. Temperature,_pH and.conductivity were , ' measured at regular gallon intervals, using a Hydac water analyzer to monitor stabilization-of these r ground water parameters.,.Field data logs are included.in Appendix B. Purged water was temporarily stored.on-site in 55-gallon drums. 2.6. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES , Water samples- were collected from selected,monitoring wells (MW-3 to MW-8) using new disposable bailers after allowing the wells to achieve a minimum 80% recovery of the pre-purge '. water volume. The samples were transferred into 40-m1 EPA-approved'vials containing 0.5 ml 18% . hydrochloric acid as a sample preservative and into 1-liter amber 'bottles without a'sample tAdvanced GeoEnvironmental,Inc.