SU0008655 - Laserfiche WebLink

Home Browse Search

Mr. Robert Torres - 2 - 11 April 2014 Sutter Home Winery FACILITY AND DISCHARGE DESCRIPTION The Sutter Home Winery —Westside Facility is located at 18667 Jacob Brack Road, Lodi in San Joaquin County. The winery and associated vineyards comprise approximately 297 acres (Assessor's Parcel Nos. 011-150-012, 011-150-023, 011-090-003, and 011-090-014) in Sections 34 and 35; T4N, R5E, MDB&M. A facility site plan showing the existing and planned domestic wastewater system expansion is provided as Attachment A of this NOA. Domestic wastewater disposal is currently provided by a 2,500 gallon per day (gpd) septic system that consists of a series of septic tanks, pump sumps, and an 8,800 square foot subsurface infiltration leachfield. The existing septic-system was constructed in 2010 and is currently permitted through San Joaquin County Department of Environmental Health Grab samples collected from the dosing tank and four pump sumps between June and September 2013 identified average BOD concentrations below 400 milligrams per liter (mg/L). The RWD indicated that construction of a bottling plant and related winery activities will include the addition of up to 500 staff during peak flow (harvest season). An estimated average wastewater flow of 15 gpd per employee will generate an additional 7,500 gpd, which will result in a combined discharge flow of 10,000 gpd. The proposed septic system is designed to accommodate the discharge from both the existing and proposed wastewater systems and allow for a combined peak flow up of 12,000 gpd. The expanded domestic wastewater system will include a gravity collection system to a series of 16 septic tanks (8 existing and 8 proposed) with a combined storage capacity of 42,200 gallons. Effluent will then be directed through 16 pump sumps (8 existing and 8 proposed) and then into a 12,000 gallon dual compartment anoxic/anaerobic tank before the wastewater is transferred to a 12,000 gallon recirculation equalization tank. Wastewater will recirculate through media filter pods and flow into a 12,000 gallon dosing tank before being discharged into a subsurface drip leachfield at the northeastern portion of the facility. The San Joaquin County Department of Environmental Health will issue a separate permit to construct the system. Percolation testing conducted at six locations within the proposed subsurface drip leachfield in May 2013 ranged in percolations rates of 0.1 to 25 min/inch. Based on these testing results, a disposal leachfield of 24,000 square feet was estimated to accommodate a total daily flow of up to 12,000 gpd at 0.5 gpd per square foot. Given the variability of percolation rates and to provide a conservative design allowing a 50% safety factor, the leachfield will be 36,000 square feet in size and divided into six zones to evenly distribute daily discharge. Subsurface irrigation lines will be installed to a depth of 12 inches bgs in the proposed subsurface drip leachfield. A 100% reserve disposal area will be located adjacent to the leachfield and will be fitted with subsurface disposal lines as needed in case of primary disposal field failure. A SCADA system will be used to monitor and control effluent flow rates to maintain uniform dosing across the zones of the leachfield. When the combined depth of scum and sludge within any tank is about 35 to 50 percent of the tank depth, the tank will be pumped and the septage will be hauled offsite to a septic receiving station. The wastewater system will be operated, maintained, and monitored by a certified wastewater treatment plant operator.