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<br />I <br />I <br />I <br /> <br />~;"'1.",.~; r:1"'~,:.:l-1 . <br />Varrabie~costs are those costs which are directly dependent on the quantity of water <br />produced~and used.,LVariable costs will 'include a portion of the salary burden, utility <br />costs chemical costs and consumable supplies (filters,'meml?ranes, etc.) The follow- <br />ing is an estimated cost for.theseitems when the reverse osmosis plant-is in <br />operation. <br />Labor <br /> <br />I <br />I <br /> <br />Electric <br /> <br />Sulfuric Acid <br /> <br />Po1yphoshate <br /> <br />Permeator replacement <br /> <br />10 Micron Prefilter replace- <br />ment <br /> <br />$0.075/1000 <br />0.305/1000 <br />0.031/1000 <br />0.015/1000 <br />0.165/1000 <br /> <br />gal <br />gal <br />gal <br />gal <br />gal <br /> <br />I <br />I <br />I <br />I <br />I <br /> <br />C/2 & PH adjustment <br /> <br />0.075/1000 gal <br />0.020/1000 gal <br /> <br />Total (Variable Cost/lOOO gal. <br />*1977) <br /> <br />The above costs reflect blending 25% deep well water with 75% R.O. product water <br /> <br />$0.686/1000 gal. use $0.69 <br /> <br />The fixed costs for operation and maintenance can be expected to escalate <br />at 4%/year compounded ;annua1ly throughout.:thedesignperiod... ' ;;.'0 <br /> <br />.,' J I At-: (';:, <br /> <br />l; ::-.,1,: '.':' <br /> <br />" ~ <br /> <br />I <br />I <br />I <br /> <br />With the proper installation and maintenance, most components of the system can be <br />expected to have a life cycle in excess of 50 years. Replacement costs are <br />based on a 30 year life for the water treatment plant equipment and pumps. All <br />other components of the system are expected to have a long indefinite life span <br />in excess of 50 years and are not included in the replacement cost. A deprecia- <br />tion allowance of $2,264/yr. has been established on existing equipment and <br />therefore is added to the calculated replacement costs. <br /> <br />Water Treatment/Equipment Pumps 151,000 @ 3.33% = $5,028.00; use $5,000.00 <br /> <br />Existing Equipment Depreciation <br /> <br />2,264.00; use $2,200.00 <br />$7,292.00; use $7,200.00 <br /> <br />Total Replacement Costs <br /> <br />I <br /> <br />The replacement costs are taken at a straight annual rate throughout the 30 <br />year life. An escalation multiplier was not applied since it is assumed that <br />this fund would be invested annually at current interest rates. <br /> <br />I <br />I <br />I <br />I <br />I <br /> <br />Shown in Table 5 is a.projection of annual 9perating, maintenance and replacement <br />costs for the period 1977 through 1995. --., ~,_J,:.'-::i.D':1 1." '. <br /> <br />( '.' ~ ~. (', I '. t! <..:.: <br /> <br />- r <br />, . - <br /> <br />," ) ;.; ~--. !' <br /> <br />.,i..;. -:. t .1.(1('. <br /> <br />-41- <br />