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Project: ARCO Station #6020 Log of Monitoring Well: <br /> Location: 1711 E Yosemite Avenue,Manteca,CA Project Number 38466092 MW-12 <br /> Dates Dnlled 07/15/2003 Total Depth 37 5 feet Borehole Name <br /> =g Contractor Woodward Drilling Well Construction Date 7/15103 Logged By Jeff Brooks <br /> Mole Diameter 8-inch Casing Diameter 2-inch Casing Type SCH 40 PVC Checked By Vernon Elarth <br /> Drilling Method Hollow Stem Auger Screen Interval 15-35 feet Slot Size 0 020-mch Sampling Method Split spoon <br /> Comments <br /> a <br /> s <br /> A > rn x °' E= C7 LTTHOLOG'Y DESCRIPTION WELL CONSTRUCTION 0 <br /> 0 1000 Ashalt and agmgate base Flush mount traffic de vault <br /> Silty Sand(SM) Dark brown-dark grayish brown,80%fine to hem � <br />' medium grained sand,20%silt,rtncaceous,loose moist 2-inch SCH 40 PVC with <br /> locking pressure cap to 15 bgs <br /> Vacuum cleared to 5 feet bgs <br />' $ Silt Sand(SM) Dark grayish brown,90%fine to medium d 5 <br /> 12 0 0 1005 y ( � n 8TH Neat Cement from near surface <br /> sand 10%silt micaceous loose to medium dense moist to 10 5 bgs <br /> 10 Sand(Sl) Yellowish brown fine to medium grained rmcaceous, 10 <br /> 15 00 1010 medium dense morsE <br /> ' 10-13 Bentonite Seat <br /> 5 15 <br /> 27 00 lots <br /> 20 Sandy Silt(ML) Grayish brown,90%silt,10%very fine to fine 20 <br /> 30 00 1020 grained sand micaceous stiff to very stiff moist to very[riots[ <br /> 2-tach SCH 40 PVC <br /> 0 020-inch Slot Screen 15-35, <br /> #3 f=ilter Pack Sand 13-35 bgs <br /> = Static Water 7/15/03 1100 23 50 feet bgs <br /> SZ First Water <br /> 25 25 <br /> 25 00 1025 <br /> Silty Sand(SM) Brown,70-75%fine to coarse grained sand, <br /> 20-25%silt,micaceous saturated <br /> 30 30 <br /> 70 00 1030 <br /> 35 Silt content increase to 35% 3 <br /> 7D/l0 0 0 1035 , a, ]t, il, Borehole Collapse due to <br /> heaving sands <br /> Heaving sands Borehole collapsed to 35 bgs <br /> i <br /> 2870 Gateway Oaks Ar Ste 300 <br /> SM-mrreato CA 95833 <br /> 916-679 2000 <br />