ARCHIVED REPORTS_XR0012434 - Laserfiche WebLink

Home Browse Search

' I0 June 1999 AGE-NC Project No 98-0450 Page 2 of 5 ' ground water was containenzed in 55-gallon drums and stored on-site 2 2 GROUND WATER SAMPLE COLLECTION The ground water levels in all four wells were allowed to recharged to a minimum of 80% of the initial well volume prior to sample collection Ground water samples were collected utilizing disposable polyethylene bailers and new nylon rope Sufficient ground water sample was collected from each well to fill three EPA-approved 40-m1 volatile organic analysis (VOA)vials containing ' 0 5 ml of hydrochloric acid(18%) as a sample preservative Care was taken to ensure that visible air bubbles were not present in the VOAs after filling and capping Ground water sample containers were labeled with the well designation, date,time, and sampler's initials ' 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and transported to McCampbell Analytical,Inc of Pacheco, California, a Department of Health Service (DHS)-certified laboratory for analyses in accordance with the following ' • EPA Method 8015 Modified for total petroleum hydrocarbons quantified as gasoline (TPH- g), • EPA Method 8020 for volatile aromatics (benzene, toluene, ethyl benzene and xylene BTEX), • EPA Method 8260 Modified for volatile organic compounds (VOCs) and di-isopropyl ether (DIPS), ethyl tert butyl ether(ETBE), methyl-ternary butyl ether(MTBE), tert amyl methyl ether (TAME) and tertiary butanol (TBA), respectively 3.0. FINDINGS Ground water elevations and flow direction were determined from field measurements hydrocarbon ' impact on ground water was determined by laboratory analysis — I ' 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT The depths to ground water from the ground water monitoring wells were measured at 44 03 to 44 75 Advanced GeoEnr3ronmental,Inc