ARCHIVED REPORTS XR0009329 - Laserfiche WebLink

Home Browse Search

hours, prior to further purging and sampling All purged water was contained in DOT- approved 55-gallon drums, was properly labeled and was temporanly stored onsite, pending laboratory analysis 3.4 Well Purging and Groundwater Sampling The water Ievel in the monitoring wells was measured prior to purging and sample collection on 22 December 1999, using an electronic water level indicator (see Appendix Q Before sampling the wells, Environeenng, Inc removed more than three well volumes In addition, three parameters (pH, conductivity and temperature) of the purged water were monitored to determine whether these parameters had stabilized, (consecutive readings vary less than 10 percent from previous readings) These are reported in Appendix C This resulted in EI removing approximately 13 gallons from each well before sampling 3.5 Laboratory Analysis As described below, soil and groundwater samples collected were submitted under chain of custody to a state certified laboratory, Precision Enviro-Tech Analytical Laboratory in Stockton, CA, for analysis 3.5.1. Soli Sample Analysis Four (4) soil samples from each soil boring were analyzed with at least two (2) of these soil samples being from the saturated zone All soil samples were extracted using EPA method 5030 After extraction, the soil and water samples were analyzed for total petroleum hydrocarbons as diesel, oil and gasoline (TPH-g, TPH-d and TPH o) by EPA Method 8015 as well as analyzed for benzene, toluene, ethylbenzene and total xylenes (BTEX) by EPA Method 5260, and Methyl tert-Butyl Ether (MTBE) by EPA Method 8260 The results of these analyses are presented in Table 1 and in text of Section 4 2 3.5.2. Groundwater Sample Analyses The groundwater samples collected from the monitoring wells MW-1 and MW-3 were analyzed for benzene, toluene, ethylbenzene and total xylenes (BTEX) by EPA Method EnvWoneering,Inc. Rgec..t No.98-01202 g