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Shih, Steven [EHD] From: Casey Kipf <ckipf@condorearth.com> Sent: Monday, August 15, 2022 10:43 AM To: Ruvalcaba, Cesar [EHD] Cc: Shih, Steven [EHD] Subject: RE: San Joaquin County Well Permit Application - 20229 Ripon Rd, Ripon CAUTION:This email is originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. Good morning Cesar and Steven, Below is the summary with assumptions for the above referenced permit application. The evaluation, with assumptions as noted, indicates that the proposed well is located in an area of moderate domestic/residential well density (10 wells per section), is not likely to interfere significantly with existing off-site wells, create unreasonable groundwater level declines/reductions in aquifer storage or to create issues with infrastructure due to subsidence and it can be approved pending any other issues that you might have with the application. Summary: - Proposed well is located outside public water service and in an area of moderate domestic/residential well density (10 wells per section). - The nearest residential well is located approximately 1,200 feet southeast of the proposed well. Online databases do not identify any Ag wells within 2,000 feet of the proposed well.A SSJID concrete lined-canal borders the parcel to the north. - The applicant proposes: well depth of 400 feet,grout seal of 200 feet, pumping rate of 800 GPM, with an annual pumping schedule of 88 ac-ft to be applied to the 25.4 acre parcel. - Proposed irrigation is 3.5 feet per acre which meets crop demand and equates to approximately 25 pumping days at 800 GPM. - Groundwater levels estimated by DWR well data ranged between 40 to 55 feet below ground surface over the past eight years; current water levels are stable but near multidecade lows based on limited DWR well data. Seasonally, water levels fluctuate approximately 3—6 feet between high and low levels in this area. The groundwater gradient is consistently to the north-northwest. - The permit application proposes a minimum well casing/grout seal of 200 feet and appears to target the Turlock Lake/Laguna and potentially the upper Mehrten formation aquifers with water-bearing zones anticipated to be under unconfined to confined conditions. - The annual total extracted volume is estimated to be approximately 28.7 million gallons, a peak pumping rate of 800 GPM, and an annualized/seasonal pumping rate of approximately 95 GPM. - The estimated aquifer volume below the 25.4-acre parcel contains approximately 2,250 acre-feet of water storage. The proposed extraction volume of 88 acre-feet per year is approximately 3.9%of the seasonal aquifer storage beneath the parcel aquifer without regard to recharge each season and is considered sustainable. - The proposed well is not located within the extents of the Corcoran Clay(located approximately 2.5 miles west), subsurface water-bearing sediments are semi-consolidated to consolidated, and the proposed well is not located in an area where subsidence is currently indicated,therefore subsidence is unlikely to be of significance or to create issues. 1