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kd = 1.0 (range = 0.5-1.3) (Complete canopy and single vegetation type) kmc =1.4 (range =0.5-1.4) (Open area,with buildings,extraordinary winds) KL=0.8x1,0x 1.4 = 1.12. (ks) (kd) (kmc) Step 2. Calculate Landscape Evapotranspiration (ETL) ETL formula: ETL = KL x Etc ........................... KL = landscape coefficient ETO = reference evapotranspiration KL= 1.12 (calculated in Step 1) ETO =41.85 inches (For months April through September) ETL= 1.12 x 40.31 =45.15 inches. (KL) (ETO) Step 3. Calculate the Total Water to Apply (TWA) TWA formula: TWA= ETL ................................. ETL = landscape evapotranspiration IE .................................. IE = irrigation efficiency ETL =45.15 (calculated in Step 2) IE =0.75 (Irrigation Efficiency estimate of 75%) TWA= ETL = 45.15 inches = 60.20 inches IE 0.75 The total water needed (in inches) to be applied to a deep-rooted grass planted over a drip imgated disposal area during the months of April through September is calculated to be 60.2 inches. The total water needed to be applied (in gallons) over half the maximum disposal area of + 3.1 acres (1.6 acres)planted in grass during the months of April through September=60.2 in.x 69,700 ft2 x 0.62 gals/ftZ-inch=2,601,500 gallons. The calculated ADF of effluent for Phase 1 (Table 8)could supply this requirement (11,250 gpd x 180 days =2,025,000 gallons). 4. WASTEWATER SOURCE AND EFFLUENT CHARACTERIZATIONS Wastewater generated from each of the proposed business establishments will originate from toilets, sinks, kitchens, laundry, etc. The wastewater originating from Phase 1 and Phase 2 of the Complex is expected to be chemically stronger than residential domestic wastewater,based upon wastewater flow analyses from fast food restaurants. 4.1 Wastewater Volume Flow Projections Several variables are involved in estimating wastewater flows from a business facility. Wastewater flow volume projections for facilities in unsewered areas have been historically and typically calculated under numerous guidelines and scenarios, as illustrated in the following list: i. Historical or measured wastewater flow data from an existing facility. 2. Published Data in the scientific literature or Governmental Codes, such as the Calif. Plumbing Code. 3. County, such as EHD Specifications (e.g., number of people, seats, bedrooms, area, etc.). 4. Number of bathroom fixtures (bathroom use per capita) for a facility. 5. Number of parking spaces for a facility. 6. Maximum number of people (e.g., employees, customers, etc.) that may be on-site. Since the project at this time is considered a San Joaquin County project and not a City of Lathrop project, The San Joaquin County Environmental Health Department Sewage Standards for wastewater flow volume determinations have been used in the flow calculations, along with pertinent and other applicable data, as illustrated and calculated in Table 8 below: Page -16- Chesney Consulting