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■ <br /> ■ <br /> SIEGFRIED <br /> APPENDIX B- NITRATE LOADING ANALYSIS FOR BUILDINGS H&I <br /> I. Introduction <br /> This nitrate loading analysis is intended to prove that the Nitrate loading as produced by the wastewater <br /> volume as a result of the staff loading from Buildings H and I, falls below the 10ppm threshold in <br /> accordance with Attachment 1. The maximum staff loading per day will be 125 people across three shifts <br /> of 8 hours each. 50 per shift for two shifts and then 25 people on the third overnight shift resulting in a <br /> peak ADF of 1,095 gpd per building for a total of 2,190 gpd. <br /> II. ADF Peak Flow and Annual Wastewater Generation <br /> The ADF established in the Sanitary Sewer Design and Operational Parameters memo for a maximum of <br /> 125 employees per day is 1,095 gpd per building for a total of 2,190 gpd. Nitrate loading is calculated on <br /> an annual loading basis in accordance with Attachment 1. The annual average volume of wastewater will <br /> be based on the following assumptions: <br /> 1. Maximum occupancy will only be achieved Monday through Friday <br /> 2. Weekends will be assumed to be minimal staff at 25% of the maximum <br /> 3. There are assumed to be 10 holidays per year with minimal to no staffing <br /> 4. The peak ADF will not be achieved on a daily basis and therefore will be reduced by 20%to <br /> better represent an average annual volume <br /> Therefore, the annual average volume of wastewater is assumed to be: <br /> W = (2,190 gpd x 80% x (5 dpw x 52wpy— 10 holidays))+(2,190 gpd x 80% x 25% x 2 dpw x 52wpy) <br /> =438,000 gals/yr+45,552 gals/yr <br /> =483,552 gals/yr <br /> = 64,646 cu-ft/yr x (1/43,560 ac-ft/cu-ft) <br /> = 1.48 ac-ft/yr <br /> III. Monitoring Plan <br /> The improvement plans include a flow monitor and sensor on the post septic tank lift stations that lifts the <br /> effluent into the leach field. The project owner has volunteered to enter into the County's monitoring <br /> program and will report the waste flows as required. Please see note on detail 2 on sheet C7.2. This flow <br /> monitoring will aid in validating that the design usage and actual usage are in alignment. <br /> IV. Nitrate Loading Analysis <br /> It is understood that due to large amounts of impervious area in the historical Hantzsche-Finnemore <br /> equation nitrate loading should be analyzed in the form of Attachment 1. The site is designed with a <br /> detention and water quality basin that serves a dual purpose. The basin is designed to attenuate large <br /> storm events so that Sugar Cut is not impacted while also capturing and treating the 85th percentile storm <br /> event with a total annual capture of least 80%. <br /> Revised Equation per Attachment 1 <br /> nr= Wnw(1-d)+Rnb/ (W+R) (See Attachment 1 for definitions of terms) <br /> Stockton San Jose Sacramento Modesto <br /> 3428 Brookside Rd. 111 N. Market St.,#300 900 Howe Ave.,#200 100 Sycamore Ave,#100 <br /> Stockton, CA 95219 San Jose, CA 95113 Sacramento, CA 95825 Modesto, CA 95354 <br /> t:209.943.2021 t:408.754.2021 t:916.520.2777 t:209.762.3580 <br /> F:\17projects\17017 Holly Sugar Industrial\Civil\Septic Sizing-Prelim\17017 Holly Commerce Center H&I Nitrate Loading <br /> Memo.docx <br />