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CAUTION:This email is originated from outside of the organization. Do not click links or open attachments unless you recognize the <br /> sender and know the content is safe. <br /> Good afternoon Naseem; <br /> Thank you for your insight on determining wastewater flow volumes when designing an OWTS. As we <br /> discussed, Section 6 of the SJC OWTS Standards references Table 6.6 - Water Use Computation. As noted, <br /> these flow volumes were based on old fixture standards. For example, old style toilets were five gallons per <br /> flush. From this flow volume, you can see how Table 6 was derived. The new California Title 20 Water <br /> Efficiency Standards state that toilets must have a maximum water use of 1.28 gallons per flush. <br /> Regarding the Delta Charter Schools project, on Page 7 of my Report, I extrapolated an Average Daily Flow by <br /> using a "worst-case scenario" of having all 21 toilets flushed on average every five minutes, over an eight hour <br /> day. I assigned 1.5 gallons per flush and 0.5 gallons for hand washing. These flow volumes incorporate <br /> additional water use. For example, using one-half gallon for hand washing could be considered excessive. <br /> From the calculations, I believe the Average Daily Flow volume of 4,032 gpd is a logically anticipated <br /> wastewater volume, and therefore can be used accordingly in the OWTS design parameters. <br /> Thank you, <br /> Don <br /> Chesney Consulting <br /> Don Chesney, PE, CCA/PCA <br /> Civil Engineer/Environmental Agronomist <br /> P.O.Box 3794 <br /> Turlock,CA 95381 <br /> 209.402.1652(C) <br /> 2 <br />