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Project: ARCO Station # 4493 Log of Monitoring Wells: <br /> .-,Laat>lon 205 North Center Street,Stockton,CA Project Number 38466609 MW-13M and MW-13D <br /> Dates Drilled 5/3/04 Total Depth 56 5 Borehole Name SO-3 <br /> D ]ling Contractor WDC Exploration and Wells Well Construction Date 5/3/04 Logged By 7 Brooks <br /> ole Diameter 10-inch Casing Diameter 2-mch Casing Type SCH 40 PVC Checked By V Elarth RG <br /> Drilling Method Hollow Stem Auger Screen Interval 15-30 45-50 Slot Size 0 020-inch Sampling Method Split spoon <br /> Comments Total depth of well materials is 51 <br /> bn <br /> .d' <br /> LITHOLOGY DESCRIPTION WELL CONSTRUCTION <br /> Flush mounted Christy box u <br /> Borehole cleared with post hole digger to 8 feet below ground Wells secured with locki❑ <br /> 0 surface g <br /> pressure caps <br /> Neat Cement from near <br /> \\ surface to 11 bgs <br /> 5 Fill silty sand sand and sandy clay with construction debris MW 13M 2-inch SCH 40 5 <br /> (pieces of brick etc) PVC to 15 <br /> MW 13D 2 inch SCH 40 PVC <br /> to 45 <br /> 18 0 \\\\\ 10 <br /> 10 <br /> 11 13 Bentonite Chips <br /> Sandy Silt with Clay(ML) Olive gray 25%very fine to fine <br /> grained sand trace to 20%clay very moist to wet hard <br /> 15 33 0 MW-13M 2 inch SCH 40 15 <br /> FVC 0020-inch Slot Screen <br /> 15 30 <br /> Silty Sand(SM) Dark Gray 30%silt 70%very fine to fine #3 Filter Pack Sand 13 31 <br /> 20 s grained sand saturated dense <br /> 32 08 20 <br /> First water 20 bgs <br /> 25 Sandy Clay with Silt(CL) Olive gray 25%fine grained sand 25 <br /> 33 10 20%silt 55%low plasticity clay very moist hard <br /> 30 19 07 As above except very suff 30 <br /> 35 7 10 35 <br /> Sandy Silt with Clay(ML) Dark olive gray 30%very fine to <br /> fine grained sand 15%clay,very moist spff 31-43 Bentonite Chips and <br /> 40 12 12 Coated Pellets 40 <br /> Silty Sand(SM) Dark gray 40%silt 60%very fine to fine <br /> 45 11 15 grained sand saturated medium dense 45 <br /> MW 13D 2 inch SCH 40 <br /> PVC 0 020 inch Slot Screen <br /> 45 50 <br /> Silty Clay with Sand(CL) Dark gray 25%silt 15%very fine #3 Filter Pack Sand 43-51 <br /> 50-- grained sand moist very stiff 50 <br /> 21 12 <br /> Borehole collapsed to 51 <br /> \\ <br /> 5-- <br /> 55 <br /> 6 1 5 35%silt 25%very fine to fine grained sand -� Formation collapse to 51 <br /> _S— <br /> 2970 Gateway Oak%or Ste 300 <br /> Sacrainento CA 95933 <br /> UM9166792000 <br />