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PROJECT <br />TreaTek- <br />NUMBER 197-32 <br />CRA A TM <br />COMPANY <br />WELL CONSTRUCTION LOG <br />WELL NUMBER CH-1 <br />PROJECT NAME EW-4A; Extration Well Replacement DATE DRILLED August 13, 1996 <br />LOCATION Lathrop Groundwater Remedial Project CASING TYPE/DIAMETER SCH 20 Low Carbon Steel/ 8.625" OD <br />DRILLING METHOD Mud Rotary/12" ARCH SCREEN TYPE/SLOT Stainless Steel; Wire Wrapped/ 0.035" <br />SAMPLING METHOD Continuous Core GRAVEL PACK TYPE Silica Sand <br />GROUND ELEVATION 25.00 feet GROUT TYPE/QUANTITY Portland Cement-5% Bentonite Grout <br />TOP OF CASING 23.00 feet DEPTH TO WATER 12.79 feet <br />LOGGED BY R.T. Siegfried GROUND WATER ELEVATION 12.21 feet <br />REMARKS Weather: Very Hot, Little Breeze, Forcast 110 F; Extraction Well EW-4A Installed 10-3-96 through 10-10-96 <br />E a BLOW COUNTS RECOVERY (%/ft.) 6 — <br />w <br />a. <br />2 <br />< (I) EXTENT ca <br />(•'. 'GRAPHIC LOG LITHOLOGIC DESCRIPTION DEPTH (ft. BGS) 5 — w ...; -J 4- w <br />WELL DIAGRAM <br />— <br />x <br />x <br />x <br />x <br />x <br />x <br />'x <br />x <br />x <br />• <br />• .)‹ <br />.x <br />- ---1 <br />ML-SANDY SILT-light brown, fine grained sand <br />ML/CL-SILTY CLAY/CLAYEY SILT-interbedded with <br />sandy layers <br />ML-SANDY SILT-gray brown <br />SP-SM - SAND-with silt, light brown, medium grained <br />Continued Next Page <br /> <br /> _ <br /> <br /> _ <br />- _i_ <br />—10— <br />_ <br />—15— <br />- <br />—20— <br />_ _ <br />_ <br />- <br />—25— <br />— <br />— <br />— <br />—30-- <br />- <br />_ <br />_ <br />—35— <br />. <br />_ <br />— <br />— <br />— <br />15 <br />— <br />_ <br />_ <br />10 <br />5 <br />0 <br />-5 <br />-10 <br />/_ <br />/_ <br />'_ <br />, <br />4, <br />/ <br />4 <br />44, <br />4 <br />4 <br />/ <br />/ <br />/ <br />, <br />/ <br />4 <br />41 <br />4 <br />1 <br />' <br />4 <br />/ <br />4 4 <br />4 <br />.4 <br />4 / <br />4 <br />/ <br />, 4 <br />4 <br />/ <br />Concrete <br />Cement-5% <br />Bentonite <br />Grout <br />Static Water <br />Level <br />10-27-96 <br />Centralizer <br />(17 bgs) <br />8.625" OD <br />Sch. 20 Mild <br />Carbon Steel <br />Casing <br />._ <br />— <br />_ <br />x <br />x . <br />x <br />SP <br />SM <br />• <br />. <br />PAGE 1 OF 6 WELL LATHR 1