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bottom of the borehole to approximately 5 feet bgs.Sand will be placed in the remaining annulus to the ground surface and completed to match the surrounding surface conditions. 5.5 Monitoring Well Installation Monitoring wells will be installed using a hollow stem auger drilling rig. During drilling,soil cores will be collected using a split-spoon sampler every 5 feet and logged in accordance with the Unified Soil Classification System.The wells will be constructed of 2-inch diameter Schedule 40 polyvinyl chloride(PVC)rasing with 20 feet of 0.0104ch factory-slotted screen from 45 to 65 feet bgs. The annular space between the borehole walls and well screens will be backfilled with a silice sand filter pack to approximately 2 feet above the top of the well screen.A 2-toot bentonite transition seal will be installed above the filter pack and hydrated in place.A neat cement sanitary seal volt be installed from the top of the bentonite seal to just below the ground surface. Wells MW-5R and MW-8R will be completed with a flush mount traffic-rated well box. The remaining wells will be completed in an above-ground monument set in a concrete pad. The proposed monitoring well construction details are shown on Figure 9. 5.6 Well Development In accordance with California Well Standards(Department of Water Resources Bulletin 74),the wells will he developed s minimum of 48 hours after installation by a combination of bailing, FIGURES surging, and pumping. The total well depth, depth to groundwater, temperature, pH, specific conductivity, dissolved oxygen, and oxidation-reduction potential volt be measured prior to the MONITORING WELL NETWORK REPLACEMENT WORK PLAN start and periodically during development. Development will continue until a minimum of five Nutrien Ag Solutions, Ina casing volumes of water have been removed and water quality parameters have stabilized. Vernalis, California 5.7 Well Survey May 2020 The location, ground surface elevation, and top of casing elevation will be measured by a California-licensed Professional Land Surveyor in accordance with the requirements forthe State Water Resources Control Board Geotrecker database. 5.9 Decontamination and Waste Management Down-hole drilling equipment will be decontaminated prior to drilling each well using high- pressure cleaning equipment. The decontamination rinsate, well development water, and soil ^� cuttings generated during drilling will be placed into separate roll-off boxes or 55-gallon drums and labeled,dated,and staged on site prior to characterization and disposal at an appropriate off- sitefacility. 5.9 Scheduling and Reporting Feld activities will be initiated after receiving the RWQCB's authorization to proceed and obtaining well drilling and encroachment permits.A Monitoring Well Network Replacement Report will be submitted approximately 8 weeks after completing the field activities.At a minimum,the report will contain: Nuelen Vemalia,Czlircmla 3 Monitoring Well Netvm Replacement Work Plan