5. ● The reverse osmosis
technology requires a
constant input at constant
pressure to perform at max
efficiency
● To account for the variable
flows, the plant can run at a
constant rate all day, by
filling up equalization
basins from the WTP
effluent
Water Treatment Vs.
Wastewater Treatment
9. Regulation - CA Title 17
Article 1
§7584. Responsibility and scope of program
The water supplier's cross-connection control program shall for the purpose of addressing the
requirements of Sections 7585 through 7605 include, but not be limited to, the following elements:
(a) The adoption of operating rules or ordinances to implement the cross-connection program.
(b) The conducting of surveys to identify water user premises where cross connections are likely to
occur,
(c) The provisions of backflow protection by the water user at the user's connection or within the user's
premises or both,
(d) The provision of at least one person trained in cross-connection control to carry out the cross-
connection program,
(e) The establishment of a procedure or system for testing backflow preventers, and
(f) The maintenance of records of locations, tests, and repairs of backflow preventers.
10. Article 2. Protection of Water System
§7604. Type of Protection Required
(c) Recycled water
(1) Premises where the public water system is used to supplement the recycled water supply use Air-
Gap Separation device (AG).
§7602. Construction of backflow preventers.
(a) Air-gap Separation. An Air-gap separation (AG) shall be at least double the diameter of the supply
pipe, measured vertically from the flood rim of the receiving vessel to the supply pipe; however, in
no case shall this separation be less than one inch.
§7603. Location of backflow preventers.
(a) Air-gap Separation. An air-gap separation shall be located as close as practical to the user's
connection and all piping between the user's connection and the receiving tank shall be entirely
visible unless otherwise approved in writing by the water supplier and the health agency.
11. Regulation CA Title 22
Article
§60305. Use of recycled water for impoundments.
(a) Except as provided in subsection (b), recycled water used as a source of water supply for nonrestricted recreational
impoundments shall be disinfected tertiary recycled water that has been subjected to conventional treatment.
Article 1.
§60301.230 Disinfected tertiary recycled water
By definition, "Disinfected tertiary recycled water" means a filtered and subsequently disinfected wastewater that meets
the following criteria:
(a) The filtered wastewater has been disinfected by either:
(1) A chlorine disinfection process following filtration that provides a CT (the product of total chlorine residual and
modal contact time measured at the same point) value of not less than 450 milligram-minutes per liter at all
times with a modal contact time of at least 90 minutes, based on peak dry weather design flow; or
(2) A disinfection process that, when combined with the filtration process, has been demonstrated to inactivate
and/or remove 99.999 percent of the plaque forming units of F-specific bacteriophage MS2, or polio virus in
the wastewater. A virus that is at least as resistant to disinfection as polio virus may be used for purposes
of the demonstration.
(b) The median concentration of total coliform bacteria measured in the disinfected effluent does not exceed an MPN of
2.2 per 100 milliliters utilizing the bacteriological results of the last seven days for which analyses have been completed
and the number of total coliform bacteria does not exceed an MPN of 23 per 100 milliliters in more than one sample in
any 30 day period. No sample shall exceed an MPN of 240 total coliform bacteria per 100 milliliters.
Article 4. Use Area Requirements.
§60310. Use area requirements.
(b) No impoundment of disinfected tertiary recycled water shall occur within 100 feet of any domestic water supply well.
12. Facilities:
Reservoir : 6 Acres
AOP: 3 Acres
Evaporation Pond: 90 Acres
Channel/Pipes:
WTP → AOP (Pipes): 2 Acres
AOP → Reservoir (Open Channel): 1 Acre
Reservoir → WTP (Pressured Pipes): 2.5 Acres
Land Cost Estimations
Totals
Total Land Size = 105 Acres
Total Land Cost ($25,000 per Acre)= $2,625,000
13. - 2040 - 2060: ~1,300 acre-ft / year or $1.3 M / year
- After 2060: ~1,800 acre-ft / year or $1.8 M / year
Water Savings
http://www.psdgraphics.com/file/water-droplet-icon.jpg
15. - 2040 - 2060: - $650,000 / year
- After 2060: - $950,000 / year
( + Cost) / ( - Savings)
(Savings: compared to river discharge)
(All values rounded up)
OPEX
16. Environmental Impact Report
- construction is Northwest of the town in a relatively remote location,
construction will not affect any residential, commercial, or industrial areas.
- construction will also not affect any roadways or cause traffic issues.
- noise during construction and operation will not be a concern due to the
remote location
- sludge will be disposed of in a
variety of methods, primary
methods include lagoon
disposal, landfill disposal,
while a small % can be used
to fertilize soil for agricultural
use or sent to WWTP to be
treated (won’t be using
deep-well injection due to risk
of GW contamination)
17. - reservoir will act as a bird refuge, along with other fauna
- will act as a backup supply of water for potential drought
- evaporation pond will help replenish groundwater supply as well
- our design will be able to
handle the projected
2060 population
- the construction will create
plenty of jobs(projected to
take ~6 years), and once
finished, we will have 4 full-
time operators
- potential downside is the risk
of corrosive water in the
concrete-lined open channels
Environmental Impact Report
