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HomeMy WebLinkAboutFIDCO 9 1 1 1 ' September 22, 1977 Mr. Richard S. Baker Fishers Island Utility Company Fishers Island, New York 06390 Dear Mr. Baker: Thank you very much for the use of the Metcalf & Eddy water study for Fishers Island which we are returning. We have copied some of the pages from this report for our Permanent Planning Board records and feel they will be most useful. Intlfre,stingly, perhaps because of the population groWtb pattern, our problems here on the North Fork appear to be related to the amount of potable 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 Wickham, Chairman Southold Town Planning Board JW/mb Enclosure 'i I February 2, 1968 W. Gordon Ahman Real Estate Department FISHERS ISLAND UTILITY COMPANY, INC. 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 should submit a map, unless they are sold in one piece. The parcel of land over seven acres you will have to have a subdivision map. The lots on the east end, Block 1, lots 1 and 9 could be sold as is, but any division other than that would have to be approved by the Planting Board. The tax map also shows Orchard Avenue going through your ' plot number 5 to 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 COMPANY9 INC. TELEPHONE 616 - 788.725i GENERAL CONTRACTING — REAL ESTATE — RENTALS FISHERS ISLAND REPAIRS - MAINTENANCE - LANDSCAPING - HOUSEHOLD SERVICES NEW YORK 06390 December 12, 1967 hlr . i.1fred R. Crebe Fishers Island New York Dear Fred: Here is a rough plan showing the property we still own on the west end of the Island, 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 course we prefer to sell them in one piece but rarely can a local person afford a large area and most of our requests are for one acre, more or less. At the East End we own Block 21 , lotsl 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 . Sincerely yours, FISHERS ISLAND UTILITY COMPANY INC. W. Cordon Ahman Real Estate Department ,iCi+ : I a enclosures (2) /�icf/920 REPORT TO FISHERS ISLAND DEVELOPMENT CORPORATION ON WATER SUPPLY AND DISTRIBUTION FACILITIES AUGUST 10, 1970 M..V METCALF 6 EDDY OF NEW YORK, INC. ENGINEERS BOSTON • NEW YORK • PALO ALTO 8..._- O _.S....aT,......c.O N.e,........... N E W V O R K P A L O A L T 0 'HARRISON P. EDDY. JR, HARRY L. .1.511- JOHN IN5ELJOHN W. RAYMOND, JR. JOHN 5, BETHEL, JR. ANDREW C PATCH ROLP ELIASSEN DEAN P. COBURN STATLER BUILDING_BOSTON MASSACHUSETTS 02116 FR,E„SAS THOMApr`°`N 'R M E T C A L F HeEDDY E N G N E E P S DAVID A OJ.CAN oc rvcw �o RIa. INR RUSSELL C HOLT cAa E AOOGe.55- MEiEOO-BO SLIM MLAIR N SOLGMON JOHN IO $AW YE R. ACS TW% 710'321-6365 JOHN ROW W ER woo LES w WILSON 16171 x23-4600 CHARLES A NNAPP NATHANIEL LIMN ULAIR GEORGE M LIVINGS TON, NAA JAMES R. WOGLL M, 41P JA DONALD A G. ALL JAMES A. FIFE WALTER AMO FRANKLIN BURTON JOHN G. CHALAS NALAS GEORGE P. FULTON GEORGE N. T02ER JAMST. RNP. JR.AI WILLIAM BVAN. VAN RIPER.JH. LTANTS August 10, 1970 ALLEN J. BSCHRO GEORGEIN13 .COBB EPiER EDWALBERT . 9. RICH ALBERTB. RICH G EOR ALO J. LA UE R. 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 facilities of the water system on Fishers Island. Our technical report covering this investigation, together with our conclusions and recommendations , follows . INVES iIGAT10 N5 • REPORTS • DESIGNS • ADVICE DUPING RONSTRU GTION • ..GE ON OPERATION PLANNING • VALUATIONS • LABORATORIES RESEARCH PROBLEMS TO BE INVESTIGATED The New York Fire Insurance Rating Organization determined in 1960 and again in 1962 that the Fishers Island water system did not meet the 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 is 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. CThe purpose of this report is to present an analysis of system deficiencies and an economical program for improvements . f 2 Mcrcn t a coot/ L.. SCOPE OF THE INVESTIGATION Our investigation includes consideration of the following subjects pertaining to the Fishers Island water system: 1. Requirements of the New York Fire Insurance Rating Organization for a 'Protected" designation for the water system. 2 . Water supply required for domestic service and fire protection through 1980 . 3. Adequacy of pumping and storage facilities and dis- 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 requirements . 6 . Estimated costs of recommended facilities . 3 METCALF & EDDY CONCLUSIONS AND RECOMMENDATIONS We present the following summary of our principal conclu- sions and recommendations : 1. Water use during the past ten years (1960-1969) has averaged 0 . 18 mgd (million gallons per day) . We estimate that by 1980 annual average daily use could reach 0 .25 mgd. 2 . Maximum one-day demand during the past ten years (1960-1969) has reached 0. 67 mgd. We estimate that by 1980 such demands could reach 0 . 85 mgd. 3. The 10-inch 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 in 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 R EDDY 6 . The 6-inch and 4-inch mains at the east end of the Island do not deliver adequate fire flows . They should be reinforced with mains of larger Capacity and a booster pump installed east of Chocomount Reservoir. 7. During summertime periods of high water demand, there is no reserve high-lift pumping capacity at the treat- ment plant . The pumps should be replaced with new high-lift pumps of greater capacity . 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- stalled 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 M ETCALF B EDDY Stage 2 Replace existing high-lift pumps $ 13,000 Install standby power 6 ,500 Install reinforcing mains in old fort and Coast Guard Station areas 227 ,500 $247 ,000 Stage 3 Construct connecting mains $2702000 $270 ,000 Stage 4 Install booster pumping station east of Chocomount Reser- voir $ 60 ,000 Construct reinforcing mains at east end of Island 309 ,000 $369 ,000 6 METCALF & CODY EXISTING FACILITIES General The water system on Fishers Island is supplied from Barlow Pond, located at approximately one-third the length of the island from the westerly end. Water from the pond flows by gravity pipeline to a suction well whence it is pumped to a nearby rapid-sand filtration treatment plant , and there is repumped into the distribution system. A distribution storage reservoir is located 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 locations of the above facilities are shown on Appendix Figure B,1. 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 from Middle Farms Pond, located about 0 . 9 miles easterly from Barlow Pond. Additional water can be added to Middle Farms 7 METCALF & EDDY 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 Barlow Pond. The plant includes chemical feed and storage facilities , aerator, mixing 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 basin 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 ,000 gallon capacity clearwell. From the clearwell it is pumped to distribution by high-lift pumps . Pumping equipment consists of two low-lift and two high- 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 METCA. F & EDDY 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 , 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 of 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 1928. Distribution Storage Distribution storage is provided by Chocomount 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 capacity of the reservoir is about 500 ,000 gallons and the overflow is at approximately El 135* • *U. S . G . S . Mean Sea Level Datum 9 METCALF 9 EDDY t GIATER SUPPLY REQUIRED General An important factor in determining the adequacy of any water-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 . Requirements 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 & EDDY 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 4 ,000 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 1 . Annual Average Daily Rates of Water Use Calendar year Average daily use , mgd 1960 0 . 17 1961 0 . 15 1962 o . 14 1963 0 . 18 1964 0 . 18 1965 0. 19 1966 o . 18 1967 0 . 17 1968 0. 22 1969 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 h EDDY maximum of 0 . 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 1960 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 reach 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 i! in Table 2 together with its percentage relationship to average daily use . Table 2 . Maximum One Day Use Annual average Maximum Percent of maximum Calendar daily , one-day, one-day to annual year marl mgd average daily 1960 0 . 17 0. 60 354 1961 0. 15 0 . 55 367 1962 0 . 14 0. 56 400 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 h EDDY Table 2 (Continued) . Maximum One Day Use Annual average Maximum Percent of maximum Calendar daily , one-day, one-day to annual year mgd mgd average daily 1967 0 . 17 0 . 48 283 1968 0 . 22 0 . 65 296 1969 0. 19 0 . 63 332 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 use ratio of 340 percent be f used. Based on such a ratio and 0 . 25 mgd estimated average use l for 1980 , the maximum one-day 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 L F.CCr 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. l 4 14 METCALF F EDDY 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 be 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 (f or about 1 . 4 mgd. The pumps deliver water to the 10-inch main 15 METCALF 6 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 of 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 indd- tate that a serious deficiency in fire flow existed in all areas t 16 METCALE & EDDY investigated. A comparison of water available and water required at the locations tested is summarized in Table 3. Table 3. Hydrant Flow Quantity required Quantity available by NYFIRO Location (gpm at 20 psi) (gpm at 20 psi) Central Ave . & Madeline Ave . 160 500 (Hydrants 36 & 37) Fox Ave . & Crescent Ave . 160 500 (Hydrants 32 & 33) Fox Ave . & Bell Hill Ave . 3,0n 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 tuberculation and, to a lesser extent , by organic growths . As a result , the pipe gradually loses capacity due to friction caused by the roughness ff of the interior. i,. 17 METCALF 6 EDDY 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 friction, 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 1902 ) 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 , so that their present capacity is less than half that of the mains when they were new. 18 METCALF & EDDY 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 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 of 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 METCALF & 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 toshut down 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. f 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 PIT t Ti!ltittt!� — 11 —?, — ! t Tl`�F.Tlt.�5,� 11, ..�il !I I . �,T � E.;'i, 'it r , , , ��i ; �Iii!it 41":T! r 111 111 t—in T�l IT pi t•l il Tit li-ia I,I �iliililf It, ti r�v1 `1 16i I r TP1 IT ol It 6 i4x� 1 7 Sq 1z 11 ,16 F T tt 16 7 lit.1pIll;', I I TIT,Til I'll, :t IT 113 01 AT it Oct.. IT� V4 I ry T: -1-641 It 41 LLL dlPr sm - o a oa S.S e •, a p • 1.0'' � � So ,',x Y. u �a \1 ��o •y�o,e I 1?'p' w q 4 .,�0 5� a�•��'� l� 9Rc' l I ��A �9. 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