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DocuSign Envelope ID: AEC27949-971E-40CF-9A0 D95FB29AA6 TSS Agreement No, 0016 Page 7 of 13 c. Review of the lithologic and geophysical logs alongside each other and selection of the final well screen depth intervals according to hydrostratigraphic interpretation and concurrence with thK::; GSA. d. Creation of a field as -built well construction diagram. 4. In general, well construction will involve: a. Final reamed borehole diameters of: i. 14 inches, or alternatively; ii. 14 inches above 810 feet and 10 inches below 800 feet b. Based on preliminary design by the GSA with DWR input, well specifications are targeted to be: i. 2.5 -inch diameter, Schedule 80 PVC blank casing. ii. 2.5 -inch diameter, Schedule 80 PVC, 0.020 -inch -wide, mill -slotted well screens. iii. Each water bearing zone is expected to have a screen interval approximately 40 -feet - long. c. A surface well seal of appropriate mixture and depth to meet well permit requirements will be set. d. Each well will be finished at the surface with a steel pipe with locking cover and concrete apron. Security fencing will also be installed to protect the well from cattle. 5. Work crews will demobilize all equipment used to construct the project improvements, clean up all work-related waste and unused materials, and return work areas to their original condition. Weil �eVelnplllerlt Well development will occur no sooner than 32 hours after the well surface seal has been completed. Well development will be accomplished by a combination of swabbing, surging, bailing to remove sediment, and purging with a submersible or air lift pump. Well development will be performed until there is good hydraulic connection between the formation and the well screen, or for a maxi onmum of 4 hours if turbidity reduction is not easily achieved. Termination of well development activities is at the discretion of the site Professional Geologist. 4 —Data Collection Wellhead Reference Paint Survey The GSA will have the elevation and coordinates of a permanent reference point and the ground surface at the wellhead surveyed by a California -licensed Land Surveyor. The reference point will: 1) be permanently marked, 2) easily transferrable to the gradations on a water level meter or tape, and 3) appropriately detailed in the surveyor's report. Groundwater Level Measurements After well development is complete and enough time has passed for the groundwater level in the well to stabilize, groundwater elevation measurements will be collected and recorded by the DWR with a water level meter or tape. DWR and GSA will then corroborate on the accuracy of the measurements. Continued groundwater monitoring and reporting to DWR data systems (SGMA or CASGEM portals, whichever is applicable) will be performed by the GSA for the useful life of the project. Groundwater Sampling and Analyses At a minimum of 48 -hours after well development is completed, groundwater samples will be collected by the DWR following industry accepted procedures and analyzed by aCalifornia-certified analytical laboratory for the following constituents: • Total dissolved solids (Std Method 2540 C) • pH and total alkalinity (Std Method 2320 B) • Specific conductance (Std Method 2510 B) • Bicarbonate, carbonate, and hydroxide (Std Method 4500) • Chloride, nitrate, and sulfate (EPA 300.0) • Total phosphorus (EPA 365.4) • Total and dissolved metals - Al, As, Cd, Cr, Cu, Fe, Pb, Mn, Ni, Se, Ag, and Zn (EPA 1638)