Laserfiche WebLink
' 19 April 2004 <br /> • AGE-NC Project No. 95-0185 <br /> Page 2 of 4 <br /> 1 <br /> 2.2. QUARTERLY GROUND WATER MONITORING <br /> 1 <br /> AGE conducted quarterly ground water monitoring on 29 January 2004. <br /> 1 <br /> 2.2.1. Well Monitoring and Evacuation <br /> ' The water level and any free-phase petroleum product in wells MW-1 through MW-5 were measured <br /> relative to the tops of the well casings using a Solinst free-product interface-probe;the ground water <br /> ' elevations and gradient were determined from this data(Table 1). <br /> After gauging.the depth to ground water, each monitoring well was purged with a dedicated, <br /> ' disposable bailer. Between 3.25 and 7.5 gallons of ground water were removed from wells MW-1 <br /> through MW-4;well MW-5 bailed dry after one-gallon ofpurging.Temperature,pH and conductivity <br /> were measured at regular intervals during purging using an Oakton water analyzer (Appendix B). <br /> ' Purged water was stored on-site in 55-gallon Department of Transportation(DOT)-approved drums. <br /> • 2.2.2. Collection and.Analysis of Ground Water Samples <br /> 1 <br /> Ground water samples were collected from the purged wells using the dedicated, disposable-plastic <br /> ' bailers. Each water sample was transferred into three 40-m1 volatile organic analysis (VOA) vials <br /> containing 0.5 ml 18% HCl as a sample preservative and one 1-liter amber bottle without <br /> ' preservative. The samples were then labeled and placed in a chilled container for transport under <br /> chain-of-custody to Cal Tech Environmental Laboratories (CTEL) of Paramount California, a <br /> California Department of Health Services(DHS)-certified analytical laboratory. All water samples <br /> were analyzed for: <br /> ' • Totalp hydrocarbons etroleum quantified as gasoline and diesel (TPH-g and TPH-d) in <br /> accordance with EPA Method 8015 Modified and <br /> ' • Benzene, toluene, ethylbenzene and total xylene (BTEX), and the fuel additives methyl <br /> tertiary butyl ether (MTBE), tertiary butanol (TBA), di-isopropyl ether (DIPS), ethyl tert <br /> ' butyl ether (ETBE) and tert amyl methyl ether (TAME) in accordance with EPA Method <br /> 8260 Modified. <br /> 1 <br /> 1 Advanced GeoEnvironmental,Inc. <br />