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7. Concrete Base: <br /> a. An approximately 4 foot square concrete base shall be constructed at ground surface <br /> around the top of the well casing and contact the annular seal. <br /> b. Contacts between the base and the annular seal,and between the base and the casings. <br /> must be water tight and not cause the failure of the annular seal or well casing. <br /> c. Where cement-based annular sealing material is used, the concrete base shall be <br /> poured before the annular seal has set. <br /> d. The upper surface of the base shall slope away from the well casing. <br /> e. The base shall extend at a minimum of two feet(2 feet)laterally in all directions from <br /> the outside of the well boring. <br /> f. The base shall be a minimum of inches in thickness. <br /> 2.3 MATERIAL QUANTITIES <br /> A. Depth: <br /> I. Sanitary Seal: 50 feet (requiring Special Water Well Permit per SJC Well Standards <br /> Section 4.7.1.1). <br /> 2. Conductor Casing(as needed or as selected by Contractor): 50 foot depth below grade. <br /> 3. Expected Total Depth: 150 to 200 feet. To be determined after boring and aquifer data <br /> has been reviewed. <br /> 4. Blank Casing: Min. l foot above grade to a depth of 50 feet. <br /> 5. Screened Interval: 50 feet to Total Depth. Final screened intervals will be determined <br /> after geophysical and lithological data has been reviewed. <br /> 6. Casing Guides: 4 guides per 100-foot depth. <br /> B. Well Pump: <br /> 1. One (1) Submersible Well Pump (Preliminary design to be confirmed lollop{ing well <br /> development and testing): <br /> a. Material: <br /> 1) 304 Stainless Steel Construction <br /> 2) Thermoplastic impeller <br /> 3) Built-in, removable suction screen and check valves <br /> b. Power& Performance: <br /> I) '/o 111' <br /> 2) 230 V <br /> 3) Delivers minimum flow of 5 GPM @ 60psi (cu 40 ft Depth to Water <br /> c. Discharge shall be 1.25 inch Female NPT. <br /> 2. Pump Setting: <br /> a. Pump suction will be at least'—)ft.below the depth at which the well specific capacity <br /> is able to meet the flow requirements. <br /> b. Pump suction will be at least 5 ft above or below the beginning or termination of <br /> screened intervals. <br /> 3. Must be able to supply at least 60 psi(140 TDH)at 40 ft of vertical depth from discharge <br /> elevation to pumping water surface. <br /> 4. Must be able to supply 5 gallons per minute at the specitied operating pressure and ft.head <br /> requirements. <br /> 5. Pump construction shall be stainless steel,and match the materials of the discharge piping. <br /> C. Diameters: <br /> 1. Conductor Casing(as needed or as selected by Contractor): 1.4 inch Carbon Steel. ASTM <br /> A139, final diameter determined after geophysical logging. <br /> GRINDSTONE JOE'S SUMMARY OF WORK <br /> REPLACEMENT WELL 01 1100-6 June 2-5,2019 <br />