SR0080262 SSNL - Laserfiche WebLink

Home Browse Search

LOGE 1907: Bavaro SS/NLS Addendum 3 Page 5 March 15, 2019 Table 2. Rates of Recharge from Percolating Waters for Site Method Result (in./yr.) Comment 100 Percent Rainfall 12.46 Likely overestimates recharge from percolating waters Evapotranspiration Reduction 3.64 Likely underestimates recharge from percolating waters in many parts of the County. A modified version of this method is currently being developed by the San Joaquin County Environmental Health Department; some adjustments to the method may be forthcoming from that agency Reduced Rainfall 9.3 Method accepted by San Joaquin County Environmental Health Department from January 2017 through January 2019 Regional Recharge from Percolating Waters 10.1 Regional average for subbasin Live Oak favors the reduced rainfall method based on its good County-wide correlation with the regional recharge value for the subbasin. To expedite processing at the San Joaquin County Environmental Health Department, however, the recharge values from both the evapotranspiration reduction method and the reduced rainfall method will be utilized for the nitrate loading calculation. The nitrate concentration of the recharge waters was estimated to be 1 mg/L-N (Hantzsche and Finnemore). Quantity and Quality of Domestic Wastewater Mr. Bavaro indicated that the existing house on Parcel 2 has three bedrooms. The parcel is five acres in size. No new construction is planned. Crites and Tchobanoglous (1998) list a typical flow rate of 50 to 70 gallons per person per day for an individual residence. The San Joaquin County Enviromental Health Department has indicated that maximum flow and double occupancy within each bedroom should be considered for the nitrate loading assessment; as a result, a value of 140 gallons per bedroom per day has been selected (personal communication, January 6, 2017). The maximum daily flow for the Site was estimated to be 420 gallons per day (gpd), calculated as 140 gallons per bedroom per day multiplied by three bedrooms. A typical residential concentration of 35 mg/L of nitrate as N was selected for the proposed residence (Crites and Tchobanoglous, 1998).