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i <br /> 6 May 1991 <br /> EVAX Project 2260-03 <br /> Drilling of Borings r <br /> Corporation (Ffazmat; C-57 License 554979) of Rancho <br /> Test Hazmat Drilling EVAX to drill the soil borings and <br /> or extraction wells. Soil borings were drilled on March <br /> Cordova, California was retained by equipped with <br /> construct the vapor <br /> 28 trucdiameter. The augers <br /> 1991 with a Mobile hollow stem ofu8�inched drili rigs for MW-25 was <br /> continuous flight, hullo each baring. The boring <br /> were steam cleaned before drilling and to a total depth <br /> roE�nd surface. Mol-25 was dese9oor <br /> ringaf rotVW-26awas <br /> drilled near the <br /> heloweg side of the station building <br /> des <br /> of 77.0 feet b 5 <br /> extraction and groundwater monitoring well • de or <br /> VW-26 was designed as a P <br /> drilled near the east side surface.e,station building and toaa rtpos depth <br /> of 60.5 feet below ground operated auger was used to test <br /> extraction well Ahand inpthe areas drilled. <br /> shallow underground piping <br /> j Soil Sampling of soils from the <br /> and sampling <br /> A geologist supervised the from drillinthe g <br /> of MW-25 were taken at 5.0 foot <br /> borings. Soil round surface. in <br /> at a depth of 5.0 feet below the g <br /> intervals starting soil samples were taken at i0.0 foot intervals <br /> the boring of Vol-26+of l0 feet below the ground surface. Samples were <br /> starting ata depth split-spoon sampler loaded with 3 <br /> length and 2.0-inch <br /> retrieved with a Calif°rnia modified, ust above <br /> volved advancing the boring to a point J <br /> ► i steam cleaned, brass} slenvolvedleveeach of 6.0-inch the hollow stem of the <br /> �•* diameter. Sampling Sliding the sampler through undisturbed <br /> the sampling depth, ler 18 inches into relatively <br /> � r <br /> augers, and driving the same A standard 140-pound hammer dropped <br /> soils below the base of the boring. into the <br /> eatedly 30 inches was used t0the°vsampleraeachr successiveo�654-inch <br /> rep r <br /> number of blows needed to <br /> geologist. <br /> increment was recorded by <br /> i4 and soils were evaluated <br /> Soils <br /> was then retrieved from the boring <br /> The samplerthe Unified Soil VaporiMeterio(O ,System- <br /> it photo- <br /> � ; by the geologifollowing Organic Vapor organic vapor <br /> were also {field screened with ualitative'y measures <br /> i� acked brass sleeves from <br /> ionization <br /> detector endsofone of the soil-packed lactic caps, and <br /> concentrations. the boring. These soil <br /> each sampling interval were sealed wileraf�om uric {oil' P Geological and <br /> tape following retrieval of the laced in iced storage. <br /> samples were then labeled and placed <br /> borings, Appendix B. <br /> t other data are summarized in the logs <br /> '' _ 2 _ <br />