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7 <br /> Soil Suitability&Nitrate Loading Study <br /> St.Patrick's Church, Escalon, CA Page 14 <br /> j" Project No. 607.1 �:._Pa•- •— ----w - -� , <br /> 1 October 14, 2009 <br /> ni f Building MTG <br /> V low Rate Ave. I Dail ow* <br /> Church GPD er Person 575 GPD <br /> Recto 70 GPD er Person 700 GPDSchool 15 GPD er Prso5 GPD <br /> Administration Bld 20 Workers(5-da0 GPD per Person 430 GPD <br /> Fi Multi-Pur ose Rm 100 2-days/wk 10 GPD per Person 285 GPD <br /> Convent ]0 Residents 70 GPD er Person 700 GPD <br /> Rate averaged over a 7-day week. <br /> The average daily flow rates are calculated by averaging to sewage output over a <br /> 7-day week. This is based on the assumption that when the buildings are i <br /> -� constructed, a holding tank will also be installed so that discharge from the <br /> church and multipurpose room, etc. can be temporarily retained and pumped to <br /> F, the septic system over several days. The holding tank is expected to have a <br /> capacity of about 5,000 gallons. <br /> 7.21---Nitrate Loading Calculations �— <br /> �- The following table summarizes the flow-rate calculation fohe an 3cipated <br /> large septic system intended to serve buildings constructed more than 10 years <br /> in the future. \ <br /> Building Daily Effluent Vol. <br /> Flow (Q) Conc. (N,,.) Weighted <br /> Ave. <br /> Proposed Church 575 GPD 80 mg/L 9.5 mg/L <br /> Proposed'Rectory 700 GPD 44 mg/L 6.4 mg/L Q <br /> 11 Proposed School 1145 GPD 60 mg/L 26.6 mg/L <br /> 1 f Proposed Admin`Bldg 430 GI' 60 mg/L 5.3 mg/L ZZ �Z f2 <br /> Multi-Purpose Rm 285 GPD 60 mg/L 3.6 mg/L / fo <br /> Proposed Convent - 44 mg/L, SCCr <br /> TOTALS 4,835 GPD 57,8 m /L <br /> Arsi <br /> x f these facilities will be served by /single large septic system. As such, <br /> the vo' ume-weighted average was calcula r- e`contrib,utfo.7 the total <br /> load from each building. The total load will b 4,835 D at 7.8 m / <br /> g nitrate <br /> concentration. Based on this flow rate, the d Tank ity from <br /> Section 1.1.14 of the wastewater standard (EHD, 2003) indicates th tic tank <br /> shouldKhaye_a capacity of at Ieast 4,700 gallons_ ernative wo araIIe' <br /> systems could be installed with a total capacity of at Ieast 2,400 gal eachF1 <br /> . j <br /> The following table summarizes the nitrate total loading from the existing septic <br /> system and the proposed new systems. The last column is the estimated total <br /> nitrate load as calculated from a simple mass-balance approach. The Hantzsche j <br /> 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone: (209) 569-029 <br /> Modesto, CA 95356 Fax: (209)„569-0295 <br />