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Drilling Log <br /> ITIT CORPORATION Monitoring Well MW-4 <br /> A Member of the rT Group <br /> Prosect 7-Eleven, SS# 19976 Owner 7-Eleven, Inc. See Site Map <br /> 1399 N. Main Street. Manteca CA 779956 For Boring Location <br /> Location Prof•No. <br /> Surface Elev. 33.03 ft. Total Hole Depth 30 ft. Diameter 8 in. COMMENTS: <br /> Top of Casing 32.73 ft. Water Level Initial 20 ft. Static NA ft. <br /> Screen: Dia 2 in. Length 20 ft. Type/Size Sch. 40 0.020 in. <br /> Casing: Dia 2 in. Length 10 ft. Type Sch. 40 PVC <br /> Fill Material Cement grout Rig/Core Mobile Drill B-61 <br /> Drill Co. Gregg Drilling Method Hollow Stem Auger <br /> Driller Trevor Joyner Log By Douglas Gay Date 05/17/99 Permit <br /> Checked By Ed Simonis License No. California RG#4422 <br /> C >. N <br /> O + c U H <br /> L^ _� 0E v o ��, Description <br /> aw w_ "a a 0 °u ao U <br /> o,, 3 E n E 3:a �, (D_j N (Color, Texture, Structure) <br /> o m u) Trace < 10%, Little 10% to 20%, Some 20% to 35%. And 35% to 50% <br /> U <br /> -2 <br /> 0 <br /> < < Fine SAND: brown, dry, no hydrocarbon odor. <br /> r 4t 2 < < 5W <br /> 4 ` <br /> 0.0 MW-4@5' 4 Silty, fine SAND (60,40): brown, dry, no hydrocarbon odor. <br /> 6 6 SM Recovery at 80%. <br /> 12 <br /> $ 0.0 Mw-498' 15 SILT with very fine SAND (80.20): brown, dry, no hydrocarbon <br /> 14 ML odor. Recovery at 90%. <br /> 10 <br /> 12 <br /> = 0.0 MW-4913' 11 Fine SAND: tan-brown, dry, loose, subangular. <br /> 14 = is Sp Recovery at 75%. <br /> Grades fine to medium SAND: no hydrocarbon odor. <br /> 16 <br /> 18 _ Recovery at 95%. <br /> 0.0 Mw-4@18' 12 ML Silty SAND (20,80): interbedded with sandy SILT (70,30): brown, <br /> 15 SI moist, micaceous, no hydrocarbon odor. <br /> 20 = <br /> 22 = SM Interbedded silty SAND and sandy SILT: grayish brown, wet. soft, <br /> no hydrocarbon odor. <br /> ' 0.0 MW-4@23'24 — 12 Recovery at 90%. <br /> = 15 <br /> USI <br /> 26 — <br /> CL Grades: silty, sandy CLAY. <br /> 28 = 0.0 MW-4928• 20 SW Medium to coarse SAND: brown, wet, loose, subrounded, no <br /> s hydrocarbon odor. Recovery at 50%. <br /> CL <br /> 30 <br /> 07/22/19991ithlog-Mar,99 Page: I of I <br />