ARCHIVED REPORTS_XR0008117 - Laserfiche WebLink

Home Browse Search

t12 February 2003 • AGE-NC Project No 95-0128 Page 2 of 7 ' On 25 and 26 November 2002, a minimum of 3 casing-water volumes were purged from each well to be sampled using a PVC submersible two-stage pump or disposal bailer, except for well MW-9, which was purged dry after two and one-half gallons of water were removed Temperature,pH and ' conductivity of purged ground water were measured at various intervals, depending on the volume of water in each well, using an Oakton water analyzer The field data and field sheets are included in Appendix A Purged water was discharged into the active ground water treatment system for ' disposal Following purging, the depth to ground water was measured to ensure that a minimum of 80% well-volume recharge had been achieved prior to sampling 2 1 2 Ground Water Sample Collection ' A w ater s ample w as c ollected f rom e ach in onitoring w ell u sing a n ew d isposable b ailer a fter allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Immediately upon retrieval, the samples were transferred into three 40-milliliter (ml) EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid (sample preservative) and into one 1-liter amber bottle without the preservative The samples collected were logged on a chain- of-custody form,placed in a chilled container and transported to McCampbell Analytical Inc (MAI), a California Department of Health Services(DHS)-certified laboratory in Pacheco,for analysis The ground water samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) by EPA Method 8015 Modified, • Benzene, toluene, ethyl benzene and xylene (BTEX) and fuel additives di-isopropyl ether (DIPE),ethyl tertiary-butyl ether(ETBE),methyl tertiary-butyl ether(MTBE),tertiary-amyl methyl ether(TAME),tertiary butanol(TBA),methanol,ethanol,ethylene dibromide(EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260 Modified 22 INTERIM REMEDIATION Between 15 August and 16 December 2002, an interim ground water pump-and-treat system was in continuous operation at the site, interim ground water pump-and-treat operation and maintenance procedures for the site were outlined in Monitoring Well Installation and Interim Ground Water Remediation • Advanced GenEnvironmenta[Inc