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' I <br /> 3. Drilling fluid shall be a biodegradable polymer system such as Poly-Bore, HEC,Dispack, <br /> Kim Mud, Duel-Vis, or a clay base bentonite system (Aquagel or equivalent), provided <br /> the properties specified below can be maintained to the satisfaction of the Engineer. <br /> 4. Contractor is advised that excessive water loss in clay zones can lead to swelling, loss of <br /> shear strength,substantial caving, and borehole stability problems. <br /> a. Drilling fluid used shall contain properties to inhibit this possibility. <br /> 5. Drilling fluid shall have the following properties in accordance with API Code RPI 3B(or <br /> latest revision)"Recommended Standard Procedures for Testing Drilling Fluids". <br /> 6. Weight — a maximum of 70 pounds per cubic foot (9.4 pounds per gallon) daring the <br /> drilling of the borehole and well construction activities. <br /> 7. Marsh Funnel Viscosity— a maximum of 50 seconds during drilling of the borehole and <br /> well construction activities. <br /> 8. Sand Content of Mud Entering the Pump-- a maximum of three (3) percent by volume <br /> during all aspects of drilling. <br /> 9. Water Loss—a maximum of 20 cubic centimeters per 30 minutes(20 cc/30 min)during <br /> drilling with a wall cake thickness of no greater than 1/8 inch. <br /> 10. Only fresh water shall be used in the drilling process. <br /> C. Geophysics <br /> I. Borehole will be geophysical logged by Contractor under the direction of the Engineer. <br /> 2. Contractor shall notify the Engineer 24-hours before total depth of the borehole is reached. <br /> 3. Contractor shall re-circulate the mud prior to geophysical logging and will <br /> cooperate/coordinate with the geophysical subcontractor in the acquisition of the logs. <br /> 4. Geophysical sub-contractor shall be an experienced geophysical logging contractor with <br /> more than 5 years of experience in logging of water wells in the Central Valley of <br /> California. Sub-contractor shall be experienced in the collection of borehole geophysical <br /> data specified herein. <br /> 5. Geophysical logging of the borehole shall include the following: <br /> a. Natural Gamma. <br /> b. Single-point resistance. <br /> c. Spontaneous-potential. <br /> d. Short-normal, long-normal,and lateral resistivity. <br /> e. Electromagnetic-inclusion. <br /> f. Fluid-resistivity. <br /> g. Log results shall be provided in electronic .LAS, .CSV or similar format for use by <br /> engineer in evaluation. Log plots shall be provided in legible format with vertical <br /> side-by-side results ofall logs on same,borehole depth scale. <br /> 6. Cuttings representative of strata encountered during drilling will be collected at least every <br /> five feet(5')and at major lithology changes or as directed by the Engineer. <br /> 2.2 WELL CONSTRUCTION MATERIALS <br /> A. The use of specific manufacturer's name and/or model or catalog number is for the purpose of <br /> establishing the standard of quality. Preliminary Well Drawing shows the desired general <br /> configuration only (actual depths and lengths will be determined following the acquisition of <br /> geophysical logs). <br /> B. Conductor Casing(if applicable/as needed by Contractor): <br /> I. if selected,drill stem and conductor casing shall be sufficient to drill to a depth ofat least <br /> 50 feet. <br /> GRINDSTONE JOE'S SUMMARY OF WORK <br /> REPLACEMENT WELL 01 11 00-3 June 2S,2019 <br />