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SECOR intenignona, <br />Logged By <br />EG <br />Date Dnlled <br />2/13/02 <br />Dnllmg Contractor <br />GREGG <br />DRILLING <br />Project Name <br />CHEVRON 9-8632 <br />TRACY, CA <br />Method/Equipment <br />SPLIT SPOON <br />HOLLOW STEM AUGER <br />Well Number <br />MW-7 <br />See "Legend to Logs" for sampling method, <br />classifications and laboratory lot_gin methods <br />Boring <br />Diam (in) <br />8 <br />Surface <br />Elev (ft) <br />27 79 <br />Groundwater Depth (ft) Total <br />Depth (ft) <br />21 5 <br />Dnve <br />wt (lbs ) <br />140 <br />Drop <br />Dist (in) <br />30 <br />Construction Well4:i Depth, (ft) Sample Recovery Blows/6" Descnption 2 <br />4. <br />' . <br />I <br />• <br />. ,— . <br />.iii <br />' '. <br />..= <br />.= <br />,= <br />.= <br />..= <br />.=- <br />..= <br />41— <br />II <br />_ <br />= _ = <br />= <br />— <br />= — — _ <br />7.-- - <br />— — _ _ <br />= <br />= — <br />— <br />= — — <br />— <br />c <br />= 7-- <br />- <br />CZ <br />, TRAFFIC <br />— <br />— <br />— <br />5— <br />— <br />— <br />_ <br />_ <br />l0 <br />1 5 —i <br />_ <br />- <br />_ <br />20 <br />— <br />_ <br />_ <br />5 <br />5 <br />9 <br />4 <br />8 <br />8 <br />8 <br />20 <br />21 <br />Grass <br />No recovery <br />CLAYEY SILT (ML) dark gray (2 5Y4/2), fine-grained sand, low <br />plasticity, moist, petroleum odor (0,5,50,45) <br />CLAYEY SANDY SILT (ML) light olive brown (2 5Y5/4), fine-grained <br />sand, low plasticity, soft, wet, slight petroleum odor (0,15,50,35) <br />SANDY CLAYEY SILT (ML) light olive brown (2 5Y514), fine-grained <br />sand, low plasticity, wet, no odor (0,30,50,20) <br />MW7 <br />@IO' <br />MW7 <br />@15' <br />MW7 <br />@20' <br />RA Ihll <br />WELL BOX <br />A_., <br />''GROUT <br />, <br />BENTONITh <br />SEAL <br />SAND <br />0020" <br />SLOTTED <br />. SCREEN <br />. <br />. <br />• . <br />• <br />. . <br />. <br />• <br />• <br />THREADS) <br />END CAP <br />The substrata descriptions above are generalized representations and based upon visuaVmanual classification of cuttings and/or <br />samples obtained dunng (inning Predominant material types shown on the log may contain different matenals and the change from <br />one predominant material type to another could be different than indicated ns'on this log apply only at the specific location <br />at the time of drilling and may not be representative of subsurface cond IPS) ions or times <br />Project No 77CH 43578 00 0203 Date REVISED 6/13/02 PR <br />86321vIW7 GPI <br />LOG OF BOREHOLE <br />Log of Well <br />Figure <br />(sheet 1 of 1)