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Wong,Jeff [EHD] <br /> From: Fox, Wayne [EHD] <br /> Sent: Wednesday, September 2, 2020 10:52 AM <br /> To: Kwong, David [CDD] <br /> Cc: Kith, Michael [EHD]; Wong,Jeff [EHD]; Naidu, Muniappa [EHD] <br /> Subject: Ashley Ranch PA-2000129 (SU) Staff Report- CEQA issue <br /> Hi David, <br /> EHD approval of individual wells for this subdivision is based on the following findings. As per UC Davis <br /> "Irrigation Management of Walnut Trees with a Limited Water Supply", a Walnut orchard uses 41 to 44 in. of <br /> water per acre per year. That translates out to 6,245 gallons per day for two acres. Actual average water use <br /> numbers from Community Service Area 46, a public water system operated by SJC, is 2.108 gal per day. CSA <br /> 46 is located within 5 miles of this subdivision and has an average lot size of 1.25 acres per parcel. EHD <br /> expects that this subdivision will use slightly higher numbers but in a similar range. Based on this information <br /> agricultural production would use more water than residential use. A check of the water levels of wells located <br /> in this area from the Department of Water Resources database shows the water table to be between 80 ft. to <br /> 100 ft. deep and reasonably stable over the last 20 years. Water quality testing performed by EHD on similar <br /> single use domestic wells in the area meets water quality standards for drinking water. <br /> Individual wells and septic systems on two acre parcels are consistent with the SJC Code of Ordinances and <br /> the Local Area Management Plan which is approved by the Regional Water Quality Control board. <br /> San Joaquin County Local Area Management Plan <br /> Policy Section 7.8 - Allowable Density for a Subdivision - SJC has alternative requirement. "The overall <br /> annual average rainfall for the county is 15.6 inches, allowing for an average density of two acres per single <br /> family dwelling according to Tier 1, Table 1. San Joaquin County Ordinance Code allows for minimum parcel <br /> sizes of two acres when utilizing a well and OWTS." <br /> Wayne Fox, REHS <br /> Interim Director <br /> San Joaquin Co Env Hlth Dept <br /> Ph (209) 468-3420 <br /> i <br />