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The Hydropunch screen was then exposed and water was allowed to enter <br /> the Hydropunch rods Groundwater samples were then collected through <br /> the rods using a bailer Groundwater samples were contained in 40-m1 <br /> volatile organic analysis (VOA) vials, preserved with hydrochloric acid, <br /> and sealed without headspace The samples were labeled, placed in <br /> protective foam sleeves, and stored on ice for transport to Kiff Analytical, <br /> LLC under chain of custody <br /> 4-5 - Der,()ntaminatiOD and DisposA of Steam-Cleaning Rinsate <br /> Drilling equipment was steam-cleaned prior to use, and sampling <br /> equipment was washed with a TSP solution between sampling intervals to <br /> prevent cross-contamination Rinsate was processed through the on-site <br /> water treatment system <br /> 4.6 Backfilling -Of Borinp <br /> At the completion of the drilling, the borings were backfilled with neat <br /> cement using either a tremae pipe or retraction grouting, depending on <br /> whichever method was deemed appropriate for each individual boring <br /> • 5 . 0 GEOPROBE DRILLING AND SAMPLE COLLECTION <br /> 51 Gf-olp robe Drilling <br /> On January 12, 2001, Gregg Drilling of Martinez, California drilled soil <br /> borings BH-A through BH-C at the site using a Geoprobe hydraulic <br /> sampling rig (Figure 5) These borings were drilled east and west of the <br /> line of recovery wells on the northern portion of the site to define the <br /> extent of contamination west of RW-1 and east of RW-5 The drilling was <br /> directed by ASE associate geologist Ian T Reed <br /> 5 .2 Soil Sample Collection <br /> Undisturbed soil samples were collected continuously as drilling <br /> progressed for lithoIogic and hydrogeologic description and for chemical <br /> analysis The samples were collected by driving a sampler lined with <br /> acetate tubes using hydraulic direct push methods Selective soil samples <br /> were immediately cut, trimmed, sealed with Teflon tape, plastic end caps <br /> and duct tape, labeled, sealed in plastic bags and stored on ice f o r <br /> transport to Kiff Analytical, LLC of Davis, California (ELAP #2236) under <br /> chain of custody Soil from the remaining tubes were described by the <br /> geologist using the Unified Soil Classification System and were screened <br /> Franks One Stop Report — March 2001 <br /> -12- <br />