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Project: ARCO Station #6020 Log of Monitoring Well: <br /> GLocat:ion::1711 E.Yosenute 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 7/15/03 logged By Jeff Brooks <br /> Borehole 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-inch Sampling Method Split spoon <br /> Comments <br /> oa <br /> D 0 ❑_ <br /> rn °' F' LITHOLOGY DESCRIPTION WELL CONSTRUCTION <br /> 00 <br /> 1000 <br /> Asphalt and aggregate b rise Flush mount traffic grade vault <br /> Silty Sand(SM) Dark brown dark grayish brown 80%fine to box <br /> medium gramed sand 20%silt micaceous loose moist <br /> 2 inch SCH 40 PVC with <br /> Vacuum cleared to 5 feet bgs locking pressure cap to 15 bgs <br /> 5 Silt Sand(SM) Dark grayish brown,90%fine to medium d 5 <br /> 12 0 0 1005 y � y gram Neat Cement from near surface <br /> sand 10%silt inicaceous,loose to medium dense moist. to 10 5 bgs <br /> 10 Sand(SP) Yellowish brown fine to medium grained micaceous, 10 <br /> 15 00 1010 medium dense moist <br /> 10 13 Bentonite Seal <br /> 5 15 <br /> 27 00 1015 <br /> 20 Sandy Stlt(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 moist <br /> 2-tach SCH 40 PVC, <br /> 0 020 titch Slot Screen 15-35, <br /> #3 Filter 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 gramed sand <br /> 20-25%silt,micaceous saturated <br /> 30 30 <br /> 70 ao ]030 <br /> i <br /> Silt content increase to 359'0 35 <br /> 35 70110 0 0 1035 Borehole Collapse due to <br /> heaving sands <br /> � hi di da <br /> Heaving sands-Borehole collapsed to 35 bgs <br /> UM2870 Gateway Oaks Dr Ste 3DO <br /> Sacramento CA 95833 <br /> 916-67920OU <br />