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'T <br /> 6 May 1991 <br /> EVAX Project 2260-03 <br /> and placed in iced <br /> sea�':3 with Teflon <br /> lined caps, labeled W-MW25-4/3/91, , <br /> storage. <br /> Laboratory Analyses <br /> record was initiated in the field for :;oil and water <br /> A chain of custody laboratory analysis. A total ❑f 5 samples 40.5 <br /> samples 5-25-20.5, 5-25-25.5, <br /> samples chosen for Sed at depths of 20.5, <br /> F boring of MW-25 were analyzed;deSented soils sampled <br /> 5-25-45.5, and 5-25-60.5 represented <br /> below ground surface, respectively. <br /> 40,5, 45.5, and m the <br /> of VW-26 were analyzed; sampled at <br /> total of 4 samples from the a�diSg26-60.5 represented soils <br /> S_26-40.5, 5-26-50.5, and 60.5 feet below ground surface, <br /> 30.5, 40.5, 50.5, <br /> 4 depths of 30.5, <br /> respectively. lied Analytical Environmental <br /> 1211) of Fremont, <br /> The 9 soil saffip wecertificateed No. APP 6soline (low <br /> petroleum hydrocarbons a g' <br /> Laboratories ( TPHg) by Environmental Protection k <br /> Samples were analyzed for total P toluene (T), <br /> a point hydrocarbons, and benzene (B}, <br /> to medium boiling P b EPA Methods 5030/8020• Water <br /> Agency (EPA) Methods 503o/modified xylenes y hydrocarbons as <br /> eth;lbenzene (E), and total xy petroleum hY <br /> W-M4v25-4/3/91 was an, for total P TPHd) by EPA Methods <br /> Sample- boiling Point hydrocarbons, „= 8015; and BTE( by <br /> dies el <br /> (high <br /> b EPA Methods <br /> 3recordsianddlabgratory analyses <br /> 5030/modified 8015; TPHg Y <br /> EPA Methodes�nOpfipendix CChain of custody <br /> ,s reports ar <br /> Soil Cuttings and Purged Water and left <br /> F a l astic sheeting ; <br /> wCre of augers and other drilling <br /> Soil cuttings from the bsteams cleaninglosed b5' P Water purged <br /> on-site. Water 55-gallon capacity steel drum. <br /> laced in a 55-g ling was also placed in steel <br /> P � equipment was placed <br /> dndsevelopment and samp responsible <br /> for the <br /> from MW-25 duringthat <br /> drums. EVAX understands from ts�etsiter will be resp <br /> removal of these maters <br /> INVESTIGATION RESULTS <br /> �-� Soil Profile. silt, silty <br /> intercalated sandy A solar <br /> transected an assembla9eofoborings, Appendix B)• <br /> The borings the soils at a <br /> sand; --and-sans_--(refer to the las-brawn -was-observed in <br /> I correspond-to-a_ <br /> change from brawn-green The color change may <br /> of apprrximately 60 feet. proximity to the <br /> depth in MW-25 was at a depth of 66 <br /> s� <br /> downward transition into moA� dlevel conditions with p <br /> shallow groundwater. Groundwater <br /> feet.,below ground surface. <br /> i, - 4 - <br />