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Soil Suitability/ Nitrate Loading Study 1rerracon Manteca Farm Improvement - Manteca, California October 29, 2019 - Terracon Project No. NA197073 The OWTS manual suggests that 30 gallons per person is typical for a day worker at schools or offices. The students will be calculated at 15 gallons per person similar to day schools without cafeterias, gyms, showers. The following table presents the proposed septic wastewater use for the site. The rates presented from the references provide general guidance but do not always reflect a match in usage. Should any of the above information provided to our office change or is inconsistent with what is stated, our office shall be contacted to make any necessary modifications to our calculations. Examination and professional judgement, and experience shall be used when selecting a reasonable flowrate. Table 10. Typical Quantity of Effluent from Sources. Average Septic effluent Average Max Max Daily Flow Average daily flow Location System Occupancy quantity per days of use (gpd`) (gpd') No. person per year (gpd'") Existing 90 people x 15 (90 people x 15 gal.per day Classroom 1 90 Students 15 156 gal.per day= x 156 days per year)/365 Building 1,350 gpd days per year=577 gpd Existing 4 Full Time 4 people x 30 gal (4 people x 30 gal.per day x Office 2 Employees 30 260 per day= 120 260 days per year)/365 Building gpd days per year=85 gpd 35 35 people x 15 (35 people x 15 gal.per day Students 15 156 gal.per day=525 x 156 days per year)/365 gpd days per year=224 gpd Proposed 15,000 ed 4 Full Time 4 people x 30 gal. (4 people x 30 gal.per day x Agricultural 3 Employees 30 260 per day= 120 260 days per year)/365 gpd days per year=85 gpd Building 4 Part Time 4 people x 15 gal. (4 people x 15 gal.per day x Employees 15 260 per day=60 gpd 260 days per year)/365 days per year=43 gpd "'gpd -gallons per day `► The maximum daily wastewater flows for each septic system are listed as follows: • Septic System No. 1 - Existing Classroom Building = 1,350 gpd • Septic System No. 2 — Existing Office Building = 120 gpd • Septic System No. 3 — Proposed 15,000 SF Agricultural Building = 705 gpd According to Ms. Nunez, the students use the facility approximately 156 days per year and the employees use the facility approximately 260 days per year; therefore, a long term average daily flow rate was calculated for each septic system to reflect the number of days the facility is used per year. The long term average daily wastewater flows for each septic system are listed as follows: Responsive■ Resourceful ■ Reliable 16