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I 1 i I 11 ' ' i t ' h , I 1 15 December 2003 AGE-NC Project No 98-0448 Page 2 of 9 - ' stabilization at regular purge-volume intervals from each well using an Oakton water analyzer Field data and logs are provided in Appendix A Purged ground water was contamenzed in properly labeled DOT-approved 55-gallon drums and was stored on-site in an area lacking general public access _ I Dual-completion monitoring well MW-4A and MW-4B were purged utilizing a Watera Hydro-Lift U pump equipped with a mechanical arm by lowering and raising a 3/e-inch outer diameter, length- discrete polyethylene hose equipped with a ball-valve water tip through the top chambers into the A specific water-charged screened section Approximately 6 to 13 gallons of ground water(a minimum " of three casing-water volumes per well)were purged from each well location Temperature,pH and conductivity were measured for stabilization at regularpurge-volume intervals from each well using, an Oak-ton water analyzer Field data and logs are provided in Appendix A Purged ground water was, containerized in properly labeled DOT-approved 55-gallon drums and was stored on-site in an area lacking general public access - 2 2 GROUND WATER SAMPLING • Following well purging, the ground water level in each of the purged wells was allowed to achieve a minimum of 80%recharge prior to sample collection Groundwater samples were collected from the purged wells utilizing new,disposable polyethylene bailers,groundwater samples were collected from the purged wells MW-4A and MW-4B utilizing 3/e-inch diameter polyethylene tubing and transferred into 40-m1 EPA-approved volatile organic analysis (VOA)vials containing 0 5,rill 18% h'ydrochlonc,acid as a sample preservative Care was taken to ensure that visible air,bubbles were 4 not present in the vials after filling and capping Ground water sample containers were labeled with the well designation, date, time, and sampler's initials ' 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES Each ground water sample was logged on a.ch_ain_-of-custody form, placed a chilled container and _ ` transported to CalTech Environmental Laboratories (CTEL), a California Department of Health Services (DHS)-certified laboratory for analysis for _ • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015 Modified,, 5 I , � I • Benzene, toluene, ethylberizene and xylene (BTEX) by EPA Method 8260B, and ' I i Advanced GeoEnvironmental,Inc iy i