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01 May 2000 <br /> AGE-NC Proj ect No 96-0232 <br /> Page 10 of 11 <br /> I63 Well Development Activities <br /> - ' On 29 March 2000, ground water extraction well EW-1 was developed utilizing a stainless steel ; <br /> hand bailer and a two-stage submersible pump Approximately 110 gallons of ground water was <br /> purged by from EW-1 until`ground water produced was visually sediment free Purged ground water <br /> was containerized in.properly labeled D O T -approved model 17H 55-gallon drums and was stored <br /> on-site in an area lacking public access A field log for extraction well development activities is <br /> included in Appendix J ; <br /> 70 CPT SOIL BORING LITHOLOGIC SOUNDINGS <br /> IOn 28, 29 and 30 March 2000, five soil borings (P-13, P-14, P-15, P-16 and P-17) were advanced <br /> at the site utilizing cone penetrometer testing (CPT) technology to clraracterize the geological and <br />' hydro-geological framework and to assess potential MTBE-migration pathways <br /> , <br /> 3 1 DRILLING ACTIVITIES <br /> Soil borings P-13, P-14, P-15, P-16 and P-17 �;veie advanced vertically to maximurn depths of 130 <br /> Ifeet bsg utilizing a 25-ton truck-Mounted CPT dnll rig equipped with 2-inch diameter hollow-stem <br /> cods (See Figure 2) Soil borings P-13, P-14, P-115, P-16 and P-17 utilized a hydraulic i am to advance <br /> a cone penetrometer tip to total depth of each soil boring Soil palarneteis such as cone penetrometer <br />' tip resistance, sleeve friction, friction ratio (ratio between sleeve friction and tip resistance) and pore <br /> water pressure were continuously measured as the cone penetrometer was advanced to depth A i <br /> continuous boring log was generated utilizing 'a Hager�togler� Co CPT computer program The <br />' Hogentoglei Co computer, program utilized the CPT, Soil Behavioi Classification Systein <br /> (Robertson,P K , Campanella,R G, Gillespie, D and Greig, J , 1986), to generate a general lithology <br />' type and display on a CPT boring log(See Appendix K) Rinseate generated during drilling activities <br /> will be containerized in properly labeled DOT-approved 55-gallon diurns, and stared on-site in an <br /> area lacking public access All soil borings were backfilled over their entire depth with a portland <br />' cement grout mix <br /> r <br /> , 4 <br />' 3 2 STRATIGRAPHY ' <br /> Based on the findings from CPT soil borings P-13, P-14, P-15, P-16 and P-17, cross sections <br />' depicting general litflology beneath the site were constructed and aic depicted in Figures 6, 7 and 8 <br /> Generally, gravelly, fine to coaise sand was observed between 35 and 50 feet bsg between 70rand <br /> 75 feet bsg and betA een 85 and 115 feet bsg, generally, silty clay and clayey silt was observed <br /> I <br /> V 4d%anctd GeoFPiAironmcnt21 Inc <br /> s <br />