ARCHIVED REPORTS_XR0005880 - Laserfiche WebLink

Home Browse Search

' 27 January 2003 • AGE-NC Project No 99-0592 ' Page 2 of 3 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES 1 Water samples were collected from monitoring wells MW-2 through MW-4 using new plastic bailers after allowing the wells to achieve a minimum 80% recovery of the pre-purge water volume In ' addition, a water sample was collected from domestic well DW-1 after the well purge valve was opened and water was allowed to run until the pump turned on The samples were transferred into laboratory-supplied 40-m1 EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as ' a sample preservative The sample containers were then labeled with well designation, date,time of sampling and the sampler's initials The samples were transported in a chilled container under chain- of-custody to McCampbell Analytical, Inc (MAI), a California Department of Health Services ' (DHS)-certified laboratory, for analysis The samples were 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 I8021 B, and • Fuel additives di-isopropyl ether(DIPE), ethyl tertiary-butyl ether(ETBE), methyl tertiary- ie butyl ether(MTBE),tertiary-amyl methyl ether(TAME),tertiary-butanol(TBA),methanol, ethanol, and 1,2-dibromoethane (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B I I3.0. FINDINGS Ground water elevation, flow direction, and gradient were determined from field data collected on 10 December 2002 Laboratory analysis of ground water samples was used to quantify the impact to ground water 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION I Depth to ground water was measured between 64 36 feet and 64 71 feet below the top of the casings, ground water elevations at the site ranged from 37 92 feet below mean sea level (MSL) in well MW-3 to 38 06 feet below MSL in well MW-4 Ground water elevation data are presented on f Table 1 Monitoring data from the site was combined with monitoring well data collected on 10 December 2002 from the adjacent former Cherokee Truck Stop site(3535 East Cherokee Road) • to dete orth me the areal ground water flow direction, which was determined to be toward the nst�TThe ground water gradient at the site was approximately 0,1U- ft/ft (Figure 3) ��I�� Advanced Ge0Environmental,Inc