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PROJECT <br />TreaTek <br />,:,,, <br />NUMBER 197-32 <br />.„...,H.„...r.„,r,...,.,,o,„„,:,„.,„„„„„„,...g,„..„.,,,,,,„,,—,,,,, - CRK <br />_ <br />COMPANY <br />WELL CONSTRUCTION I_.(.) (:3 <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 <br />— <br />CI BLOW COUNTS RECOVERY (%/ft.) SAMPLE ID. EXTENT 'GRAPHIC LOG a LITHO LOGIC DESCRIPTION DEPTH (ft. BGS) LI! •-• <br />Li, <br />WELL DIAGRAM <br />x <br />- x <br />.x <br />x <br />x. <br />, , <br />x <br />x <br />x <br />• <br />• <br />ML-SANDY SILT-light brown, fine grained sand <br />MUCL-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 />_ <br />_ <br />—5-20 <br />- <br />- <br />- <br />—10— <br />- _ <br /> <br />_ - <br /> <br />_ _ <br />—15-- <br /> <br />- — <br /> <br />- - <br /> <br />_ _ <br />—20— <br /> <br />- — <br />—25— <br /> <br />- — <br /> <br />_ _ <br />_ <br /> <br />_ — <br />30 <br />— <br />—35— <br />— <br />_ <br />— <br />_ <br />_ <br />— <br />— <br />- <br />15 <br />10 <br />5 <br />-10 <br />,_ <br />I 4 <br />4 <br />4 <br />4 <br />4 <br />4 <br />/ <br />4 <br />4 <br />4 <br />1 <br />m <br />-1 <br />4 1 / <br />1 <br />i <br />I <br />4 <br />4 <br />/ <br />4 <br />4 4 <br />4 , <br />4 <br />4 , <br />1 - <br />1 4 <br /> <br />4 <br />- <br />4 <br />4 <br />4 <br />/ <br />,A <br />'. <br />4 <br />/ <br />4 <br />) <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 />_ <br />. 5, <br />x <br />x <br />x <br />SP <br />SM <br />PAGE 1 OF 6 WELL LATHR 1