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Home My WebLink AboutFIDCO September 22', 1.977 ..,qr.. Richard S. Baker . Fishers Isl,end Utility Company P{ is .6rs Island, New York 063901 Dear Mr. Baker: :hank you very much for the use :of, the':Meteali' & Eder Wa for study for ishers - Island--which we are returning. : We have copied some -of- -the pages from this report for our - pernanent Planning Board records. and. feel they will be most useful. Inge estingly, perhaps because of;:the population grog pattern,. our problems-'here on' the Vorth Fork- appear--to:be related to the amount_ .of, toteble water available while your problems. :appear to be related to'. -the.-limitations of' the' existing facilities. It would appear that; in the long run, ---it might be. easier to solve your., -problems than ours. _Again, I wish to thank :you for your kindness. Yours truly, John `wio.kham;_: Chairman Southold Town Planning Board. N/mb _ . Enclosure February '2 .1968 W. Gordon `Ahman Real Estate Department FISHERS ISLAND UTILITY COMPANY, Fishers Island,, .New York 06390 Dear Mr. Ahman: _ This is in response to your. letter of December 12, 1967, addressed-to Mr. Fred Grebe. The 'parcels of land over -two acres . you hold,submitand seven unless they are sold in one piece. The parcel- of acres you will.have to have a subdivision map. The lots on the east end, Block 1, .lots -1 and Q ,could be sold as is, but any division other -than that would have to be approved by the Planning Board. . The� tax map also shows Orchard Avenue .going through your '. plot number 5 Ao Madison House' Road, and we would want to know what you propose .to do about this. .Very .sincerely, John Wickham, Chairman . Southold Town Planning. Board JW:bd FISHERS ISLAND UTILITY COMPANY,. NC. TELEPHONE 516 - 788-72G GENERAL CONTRACTING — REAL ESTATE — RENTALS FISHERS ISLAND REPAIRS - MAINTENANCE - LANDSCAPING, - HOUSEHOLD SERVICES NEW YORK 06390 December 12, Mr . Alfred R. Grebe Fishers Island New York Dear Fred: Here is a rough plan showing the property we , . still own on the west end of the, i sland, outlined in red,` We would like to know from your Board what our procedure should be in the event a client wants to buy a part of any of these lots. Of coarse we prefer to sell them in one piece but- rarely can - a, I oca l ' person afford .. a large area and most of our requests ' are for, one acre,i more or less. At the East End we own Block 21 , Iotsl and 2 and although we don 't want to break , these, up we would like to know the Board's feeling on these also. Will you please return the.' map of the East , End lots as this is the only one I '.have. Thanks a lot . . . S i ncere I y yours, `. FISHERS ISLAND UTILITY COMPANY INC. Gordon Ahman Real Estate Department 'v]GA : l a enclosures (2) e loc;slew s REPORT TO _. FISHERS ISLAND DEVELOPMENT CORPORATION ON WATER SUPPLY AND DISTRIBUTION FACILITIES AUGUST 10, 1970 METCALF 6 EDDY OF NEW YORK. INC. I ENGINEERS BOSTON • NEW YORK • PALO ALTO B 0 S T O N N E W V. 0. R. K" P A. L O A L T O ,HARRISON P. EDDY.JR. ''..HARRY L. KINSEL JOHN W. RAYMOND, JR. ..- JOHN S. BETHEL. JR. - - ANDREW'C. PATON , .. ROLF ELIASSEN - DEAN F. CO BURN 5TATLER BUILDING•BOSTON•MASSACHUSETTS 02116 'FRI 5 THOMARTCDCK.JR. M, E T GA L F - & ED D Y E N C I . N E E P S. DAVID A. DUNCAN DF NEW +C)RK. IN- RUSSELL C. HOLT - MORTON SOLOMON - CABLE ADDRESS-'METEDD'-BOSTON' CLAIR N. SAWYER. ACS - TWX 710-321-5365 JOHN PODGER - - - WOODROW W. WILSON - - (617) 423-5600" k CHARLES A. KNAPP ` NATHANIEL CLAPP - - - - - GEORGE M. LIVINGSTON. NAA - - - JAMES R. WOGLOM. AIP - DONALD G. BALL - - JAMES A. FIFE - - WALTER AMORV FRANKLIN L. BURTON - JOHN G. CHALAS - - - - - GEORGE P. FULTON GEORGE K. TOZER - JAMEST. O'ROURKE. AICNE WILLIAM B. VAN RIPER.JR.. { CONSULTANTS ... - August 1O, 3970 ALLEN J. BURDOIN - GEORGE J. SCHROEPFER �j. EDWIN S. COBB ALBERT B. RICH - - - - GEORALD J. LAUER. ASLO Mr. Jansen Noyes, Jr. , Treasurer Fishers Island Development Corporation c/o Hornblower and Weeks - Hemphill, Noyes 8 Hanover Street , New York' . 10004 Dear Mr. Noyes : In accordance with our proposal of January 27 , 1970, . and your authorization of March 6 , 1970, we have investigated -the 'existing pumping, storage , and distribution facilitie's of the water system on Fishers Island. Our technical report covering this investigation, `together with our conclusions and recommendations, follows . " ,INVESTIGATIONS • "REPORTS DESIGNS ° ADVICE DURING CONSTRUCTION • ADVICE ON OPERATION PLANNING • VALUATIONS • LABORATORIES • RESEARCH - PROBLEMS TO BE INVESTIGATED The New Yorke Fire Insurance Rating Organization determined in. 1.960 and aga.in' in 1962 that the Fishers Island water system. did not meet tha requirements for a "Protected" designation. The system is unable . to provide adequate fire flow in many .areas of the island, particularly at the western end where the commer- cial. district i.s. located. . Consequently, the Rating Organization has removed the "Protected". designation, ,,resulting in increased fire insurance rates Improvements in the pumping and storage facilities and distribution mains will- be necessary in order for the water system to meet .the requirements of .a "Protected" designation. The purpose of this 'report is to present an analysis of system deficiencies and an economical program for improvements . METCALF tk EDDY t . SCOPE .OF THE INVESTIGATION Our investigation . includes consideration of the following subjects. pertaining t.o. the Fishers Island water system: 1. Requirements of the New York Fire Insurance_ Rating Organization for a 9'Protected" designation for the z " 3 water system. 2 . Water. supply. required for domestic service and fire protection through 1980 . 3 Adequacy .of:pumping and . storage. facilities ';and di's- tribution mains® 4 . Additions and modifications to the. system necessary to meet present and projected future water require- ments for domestic service and fire .protection. 5 : Recommended., program of development to relieve existing . 'deficiencies.. and to meet future requirement's 6 Estimated costs of recommended facilities . ' METCALF. & EDDY CONCLUSIONS AND RECOMMENDATIONS We, present the following summary. of our..prindipal. cQncl`u sions and "recommendations : 1. Water use during- the.-past ten years (196.0 '1969)- has averaged 0: 18 mgd (million gallons per day)'. estimate that by 1980 .annual average daily use cou3.d ' reach -.0 .25 " mgd• " 2 . Maximum one-.day demand during the past , ten years (1960-196,9) .has reached 0.. 67 mga. We' estimate., that by, 1980. such" demands could reach 0 . 85 ,mgd.4 3. The 10-inob water main in Center . Island Avenue has insufficient carrying capacity to meet service:: requirements, particularly. fire flows , in.. the center of town .at the west. end of. the Island. That. portion . of :the main between the " treatment plant and Fox. Avenue should be cleaned and cement-lined. 4 : The . 6.-inch distribution mains i,n the old fort and `Coast Guard Station areas cannot. furnish the required fire. flows . , They should be reinforced -with larger . . mains . 5 . The 6-inch distribution mains in many areas of- the Island " are dead-ended; thus rendering them incapable of delivering adequate fire flows. Connecting mains should be installed. 4 METCALF & EDDY Ic6 . The 6-inch and 4-inch mains at the east ena of the Island do not deliver .adequate. fire flows , . .They should be reinforced with mains of harger capacity and a booster pump installed east of Chocoinount Reservoir. T. During summertime periods of high water demand,. the is no reserve high -lift .pumping capacity At. the ,treat ment plant . . The pumps should be replaced with new high—lift pumps of greater cap�.city . 8;. The water treatment plant has no standby power in the event of electrical failure . The spare diesel. gener. ator now at the electric power plant should be in at - the ''treatment . plant . 9 . Our recommendations and cost estimates , based .on _ current prices, for the most economical. improvements "; to the Fishers Island water system by stage . construc - tion are as follows : Stage 1 Clean 'and cement-line 10-inch main from treatment plant to Fox Avenue $130 ;000 Install automatic con- trols for existing high-lift pumps 6 ,500 . . . Install valve adjacent . to treatment plant on 10-inch main 8 ,•500 $145 ,000. 5 , - METCALF & EDDY " Stage 2 Replace existing h'ig$ lift pumps 13,000 Install standby. power 6,500 Install reinforcing mains in old fort and Coast Guard Station areas 227 ,500 $247,000 Stagy Construct connecting ' mains $270 ,000 $270,000 Stage 4 Instal . booster pumping station east of Chocomount Reser woir. $ 60;000 . construct reinforcing mains at east end of Island 309 ,000 $36g ,000 6 , METCALF & EDDY avia.u.4.1'... tLm rTr 1 e EXISTING FACILITIES General. The water on Fishers Island is supplied from . Barl.ow .Pond, located at approximately one-third the- length of the island from the .westerly end. Water from the pond flown by gravity pipeline to a suctign well whence it is pumped to a nearby rapid-sand filtration treatment plant , and there is repumped into .the .distri.bution system. A distribution storage reservoir l.ocated on_ Chocomount Hill. A water meter is located about 2 ,000 feet easterly of the intersection .of The •Gloaming and Oriental Avenue . All supply, treatment and- storage facilities for the entire Island, and the „ . distribution system east of the meter, are. owned and, .operated by the Fishers Island .Water Works , a subsidiary of, the .Fishers Island Development .:Corporation. The distribution system west of the meter is owned and operated by the West End Water Works . The ]ocations; of the above facilities are shown on Appendix Figure B-rl. Supply Barlow Pond .is a small pond, .with a drainage area :of about 40 acres , located on. the northerly -side of Center ,Island Avenue about .2 , miles easterly from the post office . The supply at Barlow Pond can be supplemented with water pumped ,f ' Middle Farms Pond, located about 0 . 9 miles easterly from. Barlow,.Pond. Additional water can .be added to Middle Farms - METCALF & EDDY .a..�..«......,......,._._.__...�._.:._.,_...u.�....:,:-:....W' .s.,.u.nr..:,.,:v.,u.Y....:. ::w:..aJ: .:x<.. ..u,.t_t:.r.;..,....,:.5� ]:.::,.n::..,as�u.mW.i:.l:1,.ir....+..n.:.•..o.:... ..:am..n..ukw..v��v.' .:•y�.tinhFui- ,..... Pond from two nearby wells and from Treasure Pond, located immediately southeasterly from, Middle ' FarMs. Pond. Treatment The water treatment plant , built in, 1928 ; is located off Center Island Avenue adjacent .to Parlow Pond. The .plant includes chemical feed and storage, facilities , aerator,.'-m zing and floc- culation basins , settling basin, filters , clearwell and low-lift and high-lift pumping facilities . Raw water flows by gravity from Barlow Pond through a . pipe. to a. low-lift pump suction well at the plant . ' The water is pumped through aeration pipes to the mixing bp.sin where alum, chlorine, and ammonia. are added, and then to the flocculation and settling basins . From the settling basin, the water flows ' to two .rapid sand filters each rated at 0. 5 mgd. The filtered water is treated with sodium carbonate for corrosion control, and then flows to a 117,OOp .gallon capacity clearwell. From the clearwell it is pumped to distribution by high-lift pumps . A . i Pumping equipment consists of two. low-lift and two high- . , i lift pumps . .One low-lift pump, driven by a 20-hp. electric motor and rated .at 700 gpm (gallons per minute) under a total dynamic head of 70 feet , is normally used to pump raw water into the plant . The second low,-lift pump , driven by a 10-hp electric motor and rated at 350 gpm under a total dynamic head of 70 feet , serves as a standby unit . The low-lift pumps were .installed when the plant was built in 1928. 8 METCALF & EDDY •lr 1 .. i,:.. 7. r, o rs t1 .t The two high-Lift pumps; each driven by a..30-hp electric motor, are. rated at 430 gpm under a total 'dynamic head of' 150 feet The high-lift pumps. were installed ..in , 1922.' •Normally only .one pump. is operated at a time . During high. demand periods in the summer, however, it is necessary to operate both pumps , ` Distribution System The distribution. system, shown on 'Appendix Figure B-1, i Y consists mostly of unlined cast-iron pipe. ranging in size from 4 to 10 inches in diameter. There are ' some 16 miles 'of distri. bution 'mains and 80 hydrants presently in service Most 'Qf the system west of the treatment plant was built between 1902 and 1905 . . Most of the system easterly from the plant_ was built between 1926 and. 1928a. Distribution Storage Distribution storage is provided- by Choeomount 'Reservoir. , located about : 1..8 miles easterly from the water treatment plant and about .600 .feet. northerly from .Center Island Avenue : The reservoir, built in '1928 ,. is of reinforced concrete construction, 78 ,.feet in 'diameter and 15 feet deep . The 'c4pacity of the reservoir is about 500 ,000 gallons and the overflow is 'at approximately :El 135* *U. S .G. S . Mean Sea Level Datum . - - - METCALF & EODY. WATER SUPPLY REQUIRED General An. important factor in determining the adequacy of- 4ny ' waver-works facility is the amount of water that the facility may be called upon to supply. Our estimates of water supply requirements for Fishers Island are based on both consumer use and requirements for adequate fire protection. Consumer use has been determined from records of water . consumption on file at the water treatment plant covering -the past. 10 years ._ Our estimates of future average daily and maximum one-day water use are based on projection of the historical water use that has occurred ,during the past 10 years Requi.rement.s for adequate fire protection have been obtained from consultation with the Public Protection Department of the New. York Fire Insurance.- Rating Organization. . Population The. population .of Fishers Island is estimated: by local.. ' officials to be approximately 3,500 during the summer months and about 500 during the winter months . The New York. Fire Insurance Rating Organization in 1960 reported a population of 3,000 during the, summer season and 600 on a -year=round basis . Summer and winter populations have remained relatively stable during the past 10 years . 10 METCALF 8; EDDY S x t Future' Population.' It is reported that 2 'or 3 houses are built. on the Island per year. Although this will result in . a moderate population increase ,.. there is no evidence to indicate that the summer popu- lation will exceed 43000 by. 1980. The winter population should ,• : .;';;; "" remain at- about ' 500. Average Water Use {� Annual .average daily rates of water use for the. :calendar years 1960 through 1969 are shown in Table 1. Table 10 Annual Average Daily Rates of Water Use Calendar year Average. daily use , mgd 1960 0 .17 1961 0. 15 1962 0 . 14 1963 0. 18 1964 0 .18 1.965 0. 19 1966 0.18 1967 0. 17 1968 0. 22 19 . 9 0..19 It may be noted from the above table that the annual average daily use fluctuated from a minimum of 0 . 14 mgd in 1962 .to a 11 , ` - METCALF Ar EDDY .:.ar.:r».u.:...._.�.._...__._.�...............:.a.:wus..vu::...wc....:...:«.,.:...yw.:...:mStmiu.v+ciw•miiu:ra'+.Yw.cu... -.. veavnaa:+:.,:.a.bi..eY+G.v.i.'r...d..i....:.e:w.u....:✓w...si.v.w.si.r:ue...+.ww...u.'ay.w.0 '="- 'u.psi:a..s�..v.....u.arru..,'w ,..._ -�. ._ maximum of O .22 mgd in 1968 and averaged 0: 18 mgd for the - 10-year period., During the period, average water use increased from 0 . 17. mgd in 19'60 to 0. 19 mgd in 1969 , showing an -overall increase of 1. 3 percent per year. Projecting this percentage increase to the average use of 0 .22 mgd reached .in 1968, we estimate that average water use could roach 0 . 25 mgd. by 1980. Maximum One-Day Use Maximum one-day use , which is the highest 24-hour use during the year, must be considered when estimating the capacity of water supply . facilities to adequately serve a community. Maximum one-day use , as indicated by the Fishers. Island Water Works records for the' years 1960 through 1969 , is given in Table 2 together with .its percentage relationship to average ' daily use . Table .2 . Maximum One Day Use Annual ave-rage Maximum Percent of. maximum Calendar daily, one-day,. .. one-day to annual year mgd mgd average daily 1960 O. 17 0. 60 354. 1961 0. 15 0. 55 367 �962 - o. 14 0. 56 An 1963 0 . 18 0 . 67 373 1964 0. 18 0 . 56 311 1965 0 . 19 0. 63 332. . 1966 0 . 18 0 . 63 351 12 METCALF & EDDY i Table 2 (Continued) . Maximum One Day. Us.e Annual average Maximum Pgrcent of maximum , Calendar daily, one day, one ..day to annual year mgd mgd average daily 1967 0 . 1.7 0...48 283 196$. Q. 22 q.65 296 :. 1969. 0. 19 0 .63 As shown in Table 2 , the ratio. of . maximum one-day to average . daily use varied from a low of .283 percent to a high of : 400 percent . The. ratio averaged about ' 340 percent For estimating future one-day demand; we recommend that a maximum one-day-to-average-daily .iise ratio of' 340 percent be r used. Based on . such a ratio and 0 . 25 mgd estimated average use for 1980, the maximum one use which could be. expected 'by 1980 would be 0 . 85 ..mgd.. Water Supply Requirements for Fire Protection In addition .to providing water .for domestic,' commercial, and industrial use , a. public water system should have sufficient capacity to provide an adequate supply for fire protection. This second requirement is .considered to, be in addition. to the., general .service requirements imposed on a system during periods of maximum one-day use The New. York Fire Insurance Rating Organization requires a water supply and distribution system. that is capable of fur- nishing hydrant flows of at least 500 gpm at 20 psi (pounds per , 13 ' METCALF & EDCY .u..w».;........�.. w,..w:m.+i.'..avw�..vm.+.wW. _ _. '.. ..o.......,..r.,........ .......e..,,..o,�...............:sy.«.e.....^_zi .....w.as.+a'�' square inch) residual pressure for a period of 4 hours , in addition to 'meeting normal service requirements , in order to . be classed as. "Protected" : While it is desirable to have the entire system qualify for a ."Protected" classification, it is most - important that the system at the western end of the Island, where there is the greatest concentration of buildings , meet this classification. '. 14 METCALF & EDDY __ SL :;,f `..':' ..'.) :<- h S''.r ,,..:; ;< ,. . y ."�'�'^,�sc'5+m •':aas-:�-'•Aasluxc::w Vic.>`tl.ntiAs.?�riats'W'.ti"''+�s3. .. ADEQUACY OF EXISTING FACILITIES General The adequacy of . a water system is based on its ability. to meet the. water requirements of the area served. The distribution system must. have sufficient capacity .to ;. _.;,.•,';,;.:; meet .peak demands while maintaining adequate' service pressures ° = During periods of maximum one-day usage, it should b'e capable. of delivering the hydrant flows required for adequate fire protec tion. The adequacy of the system to meet service conditions can , best be evaluated by 'an -hydraulic analysis .of -the distribution network under.. various. simulated flow .conditions . The adequacy of the system .to provide flows sufficient for fire fighting can be determined by means ,of" hydrant flow tests : For the .purpose of this report ,. the. adequacy of the pumping and distribution facilities will be considered through 1980 . Pumping Equipment To determine. their capacities., the two high-lift. pumps . at the filtration plant were tested by Metcalf & .Eddy and. Fishers Island Water Works personnel on April 29 , 1970 . Pump capacities were found to be substantially unchanged from the original rating (430 gpm vs/50. .feet ) . It is reported that , under peak demand conditions , the pumps can furnish water to the system up to a rate of 1,000 gpm or about 1. 4 mgd. The pumps deliver water to the 10-inch main . 15 • METCALF & EDDY - in Center Island Avenue through which. it flows both to the westerly end of the Island and eastward to Chocomount Reservoir. Our pump tests indicate that when both pumps are operating they are capable of delivering the estimated 1980 maximum one-day water use (0 . 85 mgd or 600 gpm) . On the . other hand, with both pumps operating, there is no standby pumping capacity available The pumps are 48 years old and replacement parts will become increasingly difficult to obtain. Should one of the pumps break down, it could be out of service for a considerable length of time . Under these conditions heavy summertime demands could not be met . Hydrant Flow Tests The New York Fire Insurance 'Rating Organization conducted hydrant flow tests .in September 1960 . Test results were incor- porated in a report dated November 1960 to the Fishers Island Fire District on Municipal Fire Protection Survey of the Fire District . ' The flow tests indicated that in most areas of the island there was insufficient water available. for fire protec- tion. Deficiencies were particularly prevalent in the west end and extreme east end Qf. the Island. Sketches , included in the NYFIRO November 1960 report , showing locations of hydrants with flow-test results are shown in Appendix Figures A-1 and A-2 . Metcalf & Eddy , assisted by Water Works personnel, con- ducted hydrant flow tests on April 29 , 1970 . These tests indi- cate that a serious deficiency in fire flow existed in all areas 16 METCALF & EDDY l i 4 , investigated. A comparison of water avai lab le, and .water required at the locations, tested is summarized 'in Table; 3. Table- .3. Hydrant Flow . . :.-Quantity required Quantity available by NYFTRO Location (gpm at 20 psi) (gpm at 20 psi) Central Ave . & Madeline Ave . 160 500 " (Hydrants 36 & 37) . Fox Ave . & Crescent Ave . j60 500 (Hydrants 32 & 33) . Fox Ave - & Bell Hill Ave 380 500 (Hydrants 19 & 20) Wistler Ave .. & Winthrop Dr. 145 .500 (Hydrants 60 & 61) Clay Point Drive 175 • 500 • (Hydrants 131 & 132) Easterly End of Center Island Ave . 155 500 (Hydrants 161 & .162) . Conditions of Mains The condition of mains generally refers to .their carrying , capacity rather. than material strength., Primary mains. in the Fishers Island system consist sub- stantially of unlined cast-iron pipe A cast-iron pipe has its greatest carrying capacity when it is new. With age , the inte- rior surface is roughened by -corrosion and tube'rculation and, to a lesser extent ,' by organic. growths . ' As a result , the pipe gradually loses capacity due to friction caused by .the roughness of the interior. 17 • _ - • METCALF Br EDDY uvm4u...W.v..tcYn..._f..n....r.....ra+...w.w.:vu.iY'.8+k>2ui?m+.Efrzicv:dana, uavSY.YiuveYrisatrinuu.uwvbuaw.]wvaiawa-.....w..tbv i.v.wwaw4aL.cru....a».vn..r+n.u.aww....... -- ..u..•.u..✓nra+.a..wrse -.r ur.e--re.r.. - ..........n._.. The Hazen-Williams formula is commonly_ used for deter- mining the flow :in water .mains . This formula takes into account the diameter of the pipe , the drop in pressure along the pipeline due .to- fridtion, and the roughness of the interior of the pipe expressed . as the coefficient "C" . The "C" value for new pipe is commonly between 120 and 140 . The 10-inch main in Center Island Avenue is the primary feeder main to both Chocomount Reservoir and the westerly end of the Island. Water service is therefore vitally affected by the . condition of this main. On April 29 we conducted .pipe-condition tests. on the main and from the results of our tests , have calcu- lated a Hazen-Williams ."C" value for the main west of the treat- ment plant of approximately 50 and the main extending eastward to Chocomount Reservoir of approximately 70. It would be expected that the "C" value , or carrying capacity, of the westerly main (built about 19 02) would be lower than that of the easterly main (built about 1926)' since the westerly main has been subject to corrosion for a longer .period of time® We have also estimated from our hydrant .flow tests, that the 6-inch- unlined cast-iron mains have a "C" value of approxi- mately 60 . It is apparent that sufficient corrosion has occurred in the unlined. cast-iron. mains , s'o 'that their present capacity is less than half that. of the mains when they were new. lg METCALF & CODY Results of Hydraulic Analyses As mentioned previously in this report , a, water system must.. not only be able to furnish the maximum one-day use but , in addition, it must when required, furnish an adequate .fire. flow. We have estimated the maximum one-day- use in 1980 as 0 . 85. mgd or approximately .600 gpm. We have arbitrarily assumed that 4' one-half of this use, or 300 gpm, would occur in the west end of the Island. The -fire-flow requirement as mentioned before , would be 500 gpm at 20 psi residual pressure . We have therefore estimated that the total rate of flow that must be delivered to . the center of town at the west end of the Island, in the. event .o.f q. fire , would be 800 gpm Our hydraulic analyses indicate that :, 1. the 10.-inch feeder main in its present condition is not capable of delivering 800 gpm to the west end " of the Island either from Chocomount Reservoir or , from the water treatment plant ; 2 the 6-inch. distribution mains in the old fort _ and Coast Guard Station areas , and in the area .north of the town cannot furnish a. 500 gpm fire flow; 3 , the '6-inch and 4-inch mains east of Chocomount. Reservoir do not deliver 500 gpm fire flow; ' 4 .. while a 500 gpm fire flow can be obtained from the 10-inch main in the vicinity of Chocomount Reservoir and the treatment plant , it cannot be obtained from 19. • METC A LF & EDDY many of the 6-inch branch mains in the vicinity of the treatment plant. Standby Power Another deficiency which we have noted in the system is the lack of standby power at the treatment. plant . Should. there be an electric power failure at the treatment plant , the high-lift and low-lift pumps could not function. The Island would then be dependent on ' the flows from Chocomount Reservoir, which would not provide adequate fire protection. Correction of Deficiencies . Recommendations for correcting the above noted deficiencies will be made later in this report . It should be noted however., that even after the improvements to correct these . deficiencies have been completed, it will be necessary to shut do.In irrigation flows to all golf courses ' in the event of fire . Clearwell We estimate that with a full clearwell at the treatment plant (117,000 gal) and with the filters operating to capacity ( 1 mgd) , there would be sufficient water available to furnish 800 gpm to the west end of the Island for a period of 4 hours . The east end of- the -Island would be supplied from Chocomount Reservoir. Therefore , substantially all consumer use should be provided by the filters in order to leave a full clearwell in reserve for use in case of fire at the west end . of the Island. 20 METCALF & EDDY The treatment plant and high-lift pumps should be operated so as to minimize depletion of the- clearwell _(other than during a fire). This is necessary in order that maximum ` clearwell storage be available for fire fighting 21 METCALF & EDDY f v7d� ay A.M, c e,a w r i AQG= cp P- o 06 o c K a I Lo T l vo .5 C) AC MES ocK ��• AREA. 5.35 A.G�ES -� S � � D `o I1v 10"W. � 9s•�o . 74.38' 4! -NOTE ' y °►s,9o" �3 C OO Kr->I N ATE )7l STAI�ICES P.�E MEASUV,Ep F=;ZP vl U. S. CO/�ST D AN G'EOfJETIC SUK\/EY Tr,I ANC. - ULATION STA.-T101J CHOCOMOUNT �;z," DDv E � � } PLAN OF LAND TO bE C01,4VEYED i5Y 4 t_ WEST END LAND COMPANY INC FISHEQS ISLAND UTILITY COMPAt�t`(, INC . u1 GUA�AN►EED To T4-1E t, J r, ' FISHEK5 ISLANp, t*-tEW YOKK TITt_E GUAii;L�NTEE COMPA�.t�( �' -e :3CAL-E : I = I00 FT, ` CHANDLEK PALMEK, E NG� NOVVVICH, CONNEC.TIcUT HEi�EgY CEtZTI{=Y THAT �J FEgIzUA,KY 2,4, 19GG Ca. 6Ss