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Project Name Well Number Former Arco 559 Monitoring Well Construction Log MW-1 Address Drilling Contractor Ground Surface Elevation: Top of Casing Elevation: 2085 East Main Street Cascade Drilling 22.01 21.60 Drilling Method Boring Depth Boring Diameter Stockton California Air Knife/Hollow Stem Auger 45 ft. 8.25 in. Logged By Approved By Sampling Method Well Depth Casing Type Well Screen Interval Slot Size S.Harrington R.Bussard Split Spoon 45 ft. 2"SCH40 PVC 25-45 ft. 0.010 Antea Group Project Number Headspace Monitoring Device Date Drilling Started Date Drilling Completed BPSTOCK191 PID 12/17/2019 1/8/2020 LITHOLOGY SAMPLING DATA U1 e 4 N N a T C Zo T N Y Graphic CO Visual N a E o 3 a Well Well a p U o o d a @ 3 0 .a m N w X09 Description U _ �' m m J Diagram Details o 0 Air Knife from 0 to 6.5 ft; Concrete: 0 No lithology logged 0-0.5 ft. 20 Neat Cement: 0.5-20 ft. 2"SCH40 4.5-5 Blank PVC: 5 0-25 ft. 5 15 No Recovery Silt;dark brown,90%fines,10%fine sand,trace gravel,non-plastic, _7 ML cohesive 8.5-10 67 7 as above;brown,95%fines,5%fine moist 0.0 13 sand 10 15 10 No Recovery 10 ML Silt with Sand;brown,85%fines,15% 13.5-15 100 7 fine sand,trace organics,non-plastic, moist 0.1 10 cohesive 15 10 15 No Recovery 5 Silt;brown,951/6 fines,5%fines sand, ML low plasticity moist 18.5-20 100 7 as above;light brown with some grey dry 0.0 12 mottling 14 20 20 No Recovery Bentonite: 20-23 ft. 0-- #2/12 Sand: ML Silt with Sand;brown with some grey 23.5-25 100 5 23-45 ft. mottling,85%fines,15%fine sand, moist 0.0 9 25 low plasticity,cohesive 12 25 SS=Split Spoon 0 ante6group Page 1 Of 2 Q First Encountered Groundwater Static Groundwater XINOGEN©