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i <br /> i <br /> 4.4 Field Observations/Measurements <br /> During the drilling and soil sampling, visual and olfactory observations of the soil were collected and <br /> recorded. In addition, headspace measurements were collected on the soil samples with a field Organic <br /> Vapor Meter (OVM). A summary of the field observations and headspace measurements is provided in <br /> the following table: <br /> I <br /> '':• r. ,i .�.w..ii ::..:..:.» ..,?:% :...'. .... .....,>!:s•..,.,,ir::.. .i iiy:::i.a:i•.. .:?lam:• i:�%>..r.•.........r..!.�.••.-...:.,,:•.'•. ;•!..�..:':•••'.•i!:;'�;`•:<�.r. <br /> .:. '.v.G:!::.::>:!.�.!•.:^..•.r..•.::!..�.....a �........<..!...:......>...:!!.r.!•..f .r%:.!•:�•:;.?i.A•:f..::{<:�!:!-- <br /> 0'- 15': None 0'-15': None 0'-15': <1 to 7 <br /> B1 20'; Moderate gas 20'-25': Olive discoloration 20': 200 <br /> 25': Slight HC 25': 58 <br /> 0'-15': None Q'- 15': <1 <br /> B2 20': Moderate gas 0'-24': None 20': 219 <br /> 24': Slight HC 25': 50 <br /> 5': None 5': <1 <br /> B3 10'-20': Strong gas 0'-24': None 10' 20': 112 to 870 <br /> 24': Moderate gas 24': 415 <br /> 64 2'-25': None 2'-25': None 2'-25':_<1 <br /> 85 ~ <br /> 51-23': None 5' - 23': Mone --�-5''�-23': <1 to 20 <br /> B6 5'-20': None 5' -20' None 5'-20': <1 <br /> 5'-15': None 5'- 15': None <br /> B7 20'-23': Faint to slight 20'-23': Greyish-olive 5'-15'. <1 <br /> HC odor discoloration 200'-23': 2 to 3 <br /> 5'- 10': None 5'-- 10': None <br /> B8 <br /> 15'-22': Faint to slight 15'-22': Greyish-olive 5'-22': 3 to 13 <br /> HC odor discoloration <br /> Detailed visual and olfactory observations collected during the drilling and sampling activities, as well as <br /> the headspace measurements, are recorded on the boring logs attached in Appendix B. Further details <br /> of the headspace measurement procedures are provided in attached Appendix A. <br /> 4.5 Equipment Decontamination. Investigative Tastes. Boring,IBackfill <br /> Prior to use on each boring, the direct-push drive rods and piston sampler were steam cleaned, <br /> Due to the method of boring advancement (i.e. direct push, GEOPR'OBe-type rig), no significant amount <br /> of investigative wastes were generated during the subject held activities. <br /> Upon completion of the drilling, all borings were backfilled with neat cement. The surface at each boring <br /> location was then patched with concrete or cold patch asphalt. <br /> Proj. No,: 04483-01 3 of 7 AEM <br />