(GP/GT) for Additional Water Supply in the Lower Rio Grande

PRO-FORMA CALCULATIONS FOR REVERSE OSMOSIS PROCESS (RO)
Cost Elements Costs/yr.C$x 1 000)
Capital Costs
1. Plant and Equipment(2)
2. Feedwater Pretreatment
3. Feedwater SupplyO)
4. Water Transmission
5. Brine Disposal
4.505
o
1.600
780
1.735.3
Costs/yr. ($x 10(0)
408.83
o
145.20
70.79
157.48
Water Costs,
$/1.000 gal.
.2478
o
.0880
.0429
.0954
Total Capital Costs
$ 8,620.3
$ 782.3
$ .4741
Operation and Maintenance Costs
6, Operating and Maintenance Labor
a, Plant and Equipment(3)
b, Feedwater Pretreatment
c. Feedwater Supply
d. Water Transmission
e. Brine Disposal
$/1.000 gal,
,05
o
,026
n.r.(l)
.19
Total Operating and Maintenance Labor
$ .266
7, Other Operation and Maintenance Costs
a. Payroll Extras (15% of 6a)
b. General and Administrative Overhead (30% of 6a + 7a)
c. Supplies and Maintenance Materials
d. Membrane Assembly or Replacement Tubing(2)
e. Chemicals(2)
f. Fuel or Stearn
g.
Electric Power
Plant and Equipment(2)
Feedwater Supply
Water Transmission
.008
.017
.028
.23
.075
n.r(1)
.28
.108
n.r(l)
Total Other Operation and Maintenance Costs
$ .746
Total Operation and Maintenance Costs
$ 1.012
Total Water Cost (Total Capital Plus O. & M. Costs)
$ 1.4861
(1) none required
(2) Based on recent information from Ionics, Inc., cost infonnation includes effect of 83%/17% blending; therefore, actual plant size equal
to 4.2 MGD, with Thin Film Composite (TFC) membranes and a water recovery factor of 75%. A factor of 20% has been added to cover
indirect capital costs comprised of interest during construction, engineering and contingencies. Also, a factor has been added for land cost.
(3) Based on a recent study by R.W. Harden Assoc. Total of 10 wells and a land cost factor added.