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Project Name Well Number <br /> Former Arco 559 Monitoring Well Construction Log MW-4 <br /> Address Drilling Contractor Ground Surface Elevation: Top of Casing Elevation: <br /> 2085 East Main Street Cascade Drilling 21.52 21.14 <br /> Drilling Method Boring Depth Boring Diameter <br /> Stockton California Air Knife/Hollow Stem Auger 45 ft. 8.25 in. <br /> Logged By Approved By Sampling Method Well Depth Casing Type Well Screen Interval Slot Size <br /> S.Harrington R.Bussard Split Spoon 45 ft. 2"SCH40 PVC 25-45 ft. 0.010 <br /> Antea Group Project Number Headspace Monitoring Device Date Drilling Started Date Drilling Completed <br /> BPSTOCK191 PID 12/17/2019 1/8/2020 <br /> LITHOLOGY SAMPLING DATA <br /> U C <br /> C2 C CL N L O 0 (O N J <br /> O r <br /> Graphic CO Visual o o a ° 3 o Q Well Well a <br /> W Log Cn Description 2 L _ � 0 m m J Diagram Details o <br /> No Recovery <br /> -5- <br /> 2"SCH40 PVC <br /> with 0.010 <br /> Screen: <br /> ML Silt;brown,95%fines,5%fine sand, 28.5-30 100 7 25-45 ft. <br /> non-plastic,cohesive 8 <br /> 30 as above;with some grey mottling moist 0.0 9 30 <br /> No Recovery Q <br /> _10- <br /> MIL Silt with Sand;brown,90%fines,10% wet 33.5-35 100 5 <br /> fine sand,low plasticity,cohesive 7 <br /> —3512 0.1 11 35 <br /> No Recovery <br /> -15- <br /> MIL Silt;brown,95%fines,5%fine sand, moist <br /> 38.5-40 100 5 <br /> low plasticity,cohesive 12 <br /> 40 SM Silty Sand;brown with some grey 0.3 18 40 <br /> mottling,75%fine sand,25% <br /> non-plastic fines,non-cohesive <br /> 20 No Recovery <br /> Lean Clay;brown with some green <br /> CL mottling,95%fines,5%fine sand, moist 43.5-45 100 6 <br /> low-medium plasticity,cohesive 15 <br /> 45 as above;with white patches 0.1 22 45 <br /> Boring terminated at 45 ft.bgs. <br /> -25- <br /> 50 50 <br /> SS=Split Spoon Q <br /> antea®group <br /> Page 2 of 2 77 First Encountered Groundwater Static Groundwater XINOGEN® <br />