Loading...
HomeMy WebLinkAbout1.0 ApplicationCOLORADO DEPARTMENT OF HEALTH Water Quality Control Division 4210 E. 11th Avenue Denver, CO 80220 INTERNAL WQCD USE ONLY PLAN SPEC FLDP DCAL REC' D LOG BY REQUEST FOR REVIEW OF DRAWINGS AND SPECIFICATIONS PERTAINING TO POTABLE WATER SUPPLY FACILITIES *Please type* (Submit in duplicate) FROM: West Glenwood Water District (Name of Municipality, District, Utility, or other owner) B�slness Address: Box 2171, Gle-wood Springs, CO 81602 Phone(303) 945-0619 County in which facility is located Garfield • It is requested the Colorado Department of Health, Water Quality Control Division review the following drawings, specifications, reports, and design information: Documents Submitted: Blueprints of plant layout, raw water transmission line and raw water intake. Additional information may be requested by the'Water'Quality Control Division and local government officials. This may include the relationship of this facility to the area -wide plan, flood plain data, provision for maintenance and operation of this facility, and legal status of the owner(district, association, municipality). Consulting Engineer Schmueser Gordon Meyer, Inc. Project Engineer Louis Meyer Address 1512 Grand Avenue, Suite 212 Glenwood Springs, Colorado 81601 Telephone (303) 945-1004 Estimated project cost:$ 200,000.00 Estimated bid opening date: Estimated completion date: February 1, 1987 N/A 20797 Registered I. INFORMATION REGARDING PROJECT SUBMITTED FOR POTABLE DISTRIBUTION AND/OR STORAGE SYSTEM FICiLITiES: (Musz complete A through C) A. Potable water storage capacity gallons. Type material B. Water distribution lines: (Approximate lengths by sizes) a. feet of in. b. feet of in. c. feet of in. d. feet of in. C. This potable water is treated and supplied by . (Municipality, District, etc.) II. INFORMATION REGARDING WELLS AND/OR WATER TREATMENT FACILITIES: (Must complete D through I) B, Description and size of water treatment facility: The water treatment facilit is being designed for a 1.0 million gpd capacity. The treatment facility consists of a surface water intake and infiltration gallery off Mitchell Creek followed by diatomaceous earth filtration followed by chlorination and chlorine contact. itchell Creek within the E. Type of Raw Water Source:(include stream or river basin coloredo River Basin. a. Location of intake Approximately 0.5 mi. upstream of the confluence of Mitchell b. If wells, depth feet formation Creek with the Colorado River. F. Location of water facility: (If it is not a municipal system, state distance and direction from nearest incorporated town or city.) West Glenwood Water District is located within West Glenwood just west of the incorporated town of the City of Glenwood Springs. G. Give distance upstream of all domestic and industrial waste discharges: None H. Elevation (MSL) of the 100 -year flood Flood mapping not recorded in this area. ft. MSL. (This must also be shown of the plans.) 100 -yr. floodplain elevation approximately 700 feet upstream is elevation 5688. I. Are the wells or treatment plant designed to continue operation during a 100 -year flood event? Yes Recommended Recommended DATE APPROVAL DISAPPROVAL C. a- Q ,5 /a c Signature and title for Local Health Department or County Sanitarian Legally recognized signature and title for the owner of the facility. • ',2L0: -DO DEPARTMENT OF HEALTH WDter Quality Control Division Drinking Water Section 4210 E. 11th Avenue Denver, CO 80220 DATE: 100 YEAR FLOOD PLAIN CERTIFICATION Re: This Statement must accompany all Requests for Review, plans and specifications for water wells and/or water treatment facilities submitted to the Colorado Department of Health. PROJECT TITLE: West Glenwood Water District/ County Garfield Treatment Plant CONSULTANT Schmueser Gordon Meyer, Inc. STATEMENT I hereby certify that a Professional Engineering judgment has been made after evaluating all available flood plain data from the Colorado Water Conservation Board, U.S. Army Corps of Engineers, Housing and Urban Development, County Government, Local Flood Districts, etc. regarding a potential 100 -year flood threat to the water treatment plant for West Glenwood Water D stlri t treatment plant) name of entity or district, etc. In my opinion, these water works as located and designed, are not subject to flood damage by a 100 -year event, based on information enclosed from the flood insurance rate map for Garfield County, Colorado , Panel #1431, January 3, 1986. Signature and Ti1<fie 1 / SCH! 1UESER GORDON !. EYER INC. January 16, 1987 Mr. Jerry Bibersteine Water Quality Engineer Colorado Department of Health 4210 East Eleventh Denver, Colorado 80220 1512 Grand Avenue, Suite 212 Glenwood Springs, Colorado 81601 (303) 945-1004 CONSULTING ENGINEERS & SURVEYORS/ RE: Request for Review of Water Supply Facilities for West Glenwood Water District Dear Jerry: Please find enclosed blueprints, application and engineering data for the review of a new water treatment facility for the West Glenwood Water District. I am also sending a copy of this to the local Garfield County Health Officer. I will be contacting you shortly upon your re- ceipt of this application to discuss the project with you further. Be- cause of extremely tight time frame, the District has already proceeded with construction of some of the facilities on the plant and for reas- ons which we can discuss later, it is extremely important that the District be in a position to produce water in February of this year. Thank you for your consideration of this. Sincerely, SCHMUESER GORDON MEYER, INC. Louis Meyer, P.E. LM:lc/6068 xc: -West Glenwood Water District -Iris Sherman, Garfield County Health Officer ENGINEERING REPORT FOR WEST GLENWOOD WATER DISTRICT TREATMENT FACILITY This report provides the Colorado Department of Health with the prelim- inary informaton to go along with the enclosed construction drawings. Included in this report is a discussion of the history of the project, water use and projected growth within the District, quantity of raw water source, quality of raw water source and broad design parameters of the treatment facility. 1. HISTORY OF PROJECT The West Glenwood Water District is a special district that pro- vides water service to the West Glenwood area of Glenwood Springs. Currently, the District obtains treated water from the City of Glenwood Springs whose source comes from No Name and Grizzly Creeks. The District's long range plan includes the development of their own source of water so that the additional pressure put on the City of Glenwood Springs' system can be al- leviated. This project is the culmination of that long term goal and complements the City of Glenwood Springs water system which relies on a sole raw water source at this time. I1. WATER USAGE The West Glenwood Springs Water District's water usage has been metered since 1981. The District has installed a master meter which meters the entire water usage for the West Glenwood Water District. The City of Glenwood uses the same meter readings to charge the District on a bulk rate basis. Please find attached the average daily water readings on a mon- thly basis for the year 1985. When based upon a monthly basis, the average daily flow for the District has been calculated to be 424,000 gpd. Currently, the City of Glenwood Springs is in the process of de-annxing the majority of all the commercial area within the West Glenwood service area, including the West Glenwood Mall and numerous other commercial entities. It is an- ticipated that the water use of this de -annexed area is approxi- mately 43,000 gpd based upon 361,000 square feet of commercial area and 0.12 gpd per square foot of usage. After subtracting this water usage from the District's total usage, the District's average daily use would be approximatelay 380,000 gpd. The highest average daily consumption of water in the last four years occurred in June of 1985 which recorded 790,000 gpd. Again, when subtracting out the de -annexed area of the commer- cial area in West Glenwood, the resultant peak flow would be approximately 746,000 gpd. ENGINEERING REPORT FOR WEST GLENWOOD WATER DISTRICT TREATMENT FACILITY III. GROWTH PROJECTIONS The area within the District's service area is largely built out at this time. The major growth areas that are left within the District's service area, the majority of which is a proposed RV park, has indicated they will annex into the City of Glenwood Springs and rely on the City's water for service. Therefore, the remaining areas of the District are largely developed at this time, and it is not anticipated that water usage will increase. IV. DESIGN CAPACITY OF PROPOSED IMPROVEMENTS The treatment capacity of the proposed improvements will be 1.0 mgd or 690 gpm. In addition to the proposed treatment plant improvements, the District currently has a 70 gpm well and has future plans to drill several other wells. This application does not include the submittal of future wells. Based upon the capacity of the proposed improvements of 690 gpd and the exist- ing 70 gpm well, the total capacity of the District's system will be 760 gpm or 1.1 mgpd. This compares to the District's average daily flow of approximately 380,000 gpd and a peak flow of approximately 746,000 gpd. In addition, the District is currently working on an agreement with the City of Glenwood that would allow the District to use Glenwood Springs water in case of water shortage, and would al- low the City of Glenwood Springs to rely on District water in case of shortages to the City of Glenwood Springs' system. Currently, the City and District infrastructure is set up to do this. V. RAW WATER SOURCE Enclosed is a report which our firm provided to the West Glen- wood Water District in January of 1984 which discusses the de- velopment of Mitchell Creek as a water supply. For this pro- ject, the District is relying on two water sources; those being water from Mitchell Creek and groundwater tributary to Mitchell Creek. This report discusses the quantity of water available in Mitchell Creek, as well as quality considerations. VI. TREATMENT PLANT OPERATIONS The primary treatment operation for this treatment facility will be through the use of diatomacious earth filters. Research has shown that diatomacious earth filtration process is very effect- ive in removing giardia cysts and works well with low turbidity waters. The chemical analysis of Mitchell Creek in the enclosed report, shows water quality indicative of high -mountain low turbidity streams. ENGINEERING REPORT FOR WEST GLENWOOD WATER DISTRICT TREAMENp FACILITY VI. TREATMENT PLANT OPERATIONS (continued) The treatment processes for the proposed facility include the following. A water infiltration and filtration gallery will be installed below the alluvial gravel of Mitchell Creek. This infiltration filtration gallery will consist of well screen em- bedded in a series of graded aggregates surrounded by a mirafy fabric. It is anticipated that the infiltration filtration gallery will lower the turbidity during those times of year when the turbidity is high. Water will then gravity flow through ap- proximately 1500 feet of 12" transmission main to the treatment facility. Low service water pumps will then pump water through the diatomaceous earth filters. Prior to the filters and after the low service pumps, chlorine will be injected into the raw waterline. The diatomaceous earth filters consist of cylindri- cal septums. The septums will be pre -coated with diatomacious earth and a body feed slurry will be introduced_. into the raw water _ prior to :filtration. Water from the filters will them be piped into _a -clear well.-_ Flow-oontrot-valves- will -be --provided- on the -effluent side of the two filters to maintain a - consistent - 345 gpn flow.- -Water from the clear well will then be pupped to the District's LONG water storage tank through three high ser- vice pumps, each rated at 345 gpn at the rated total dynamic head. The low service pumps will also be rated at 345 gpn at the TDB through the filters. A backwash cycle will initiate either from the reading on the finished water turbidimeter or from a differential pressure across the filter of 25 psi. The backwash of the diatomaceous earth occurs in two cycles. First, the influent and effluent valves are closed and the ef- fluent backwash valve is opened to allow the pre -coat slurry and water to drain from the tank. Then the tank is pressurized to form a pocket of high pressure air in the dome of the filter. The effluent backwash valve is then rapidly opened to backwash through the septum filters. - This cycle is repeated twice to -al- low for effective backwash of the septums. An operating sequence for the operating backwash and pre -coat cycles is provided. The filters are pre -coated with diatomacious earth from the pre - coat feed tank. The pre -coat feed tank, which is provided with a continuous mixer, will gravity flow into the filters. The backwash pump will then pump water from the clear well to the filters and pre -coat the filters. A pre -coat 2-5 mm thick will coat the septum from a 0.3% - 0.6% D.E. slurry. A recirculation pump will be provided to pump water out of the clear well to the filters in those instances when the filters are not pressurized to maintain the diatomacious earth pre -coat on the septums. ENGINEERD G REPORT FOR WEST GLS WATER DISTRICT mmuumme FACILITY VI. TREATMENT PLANT OPERATIONS (continued) A body feed pump will add a D.E. slurry to the raw water prior to filtration. A body feed tank and continuous mixer will store the body feed slurry. The D.E. body feed concentration will be 1-3 mg/1. Flow meters will be provided on the influent and effluent lines, as well as the backwash lines so that all water can be accounted for. High/low level and alarm floats will be provided in the clear well which will operate the low service pumps. The high service pumps pumping out of the clear well will be operated off the level of the 1.0 MG tank through the use of a receiver at the 1.0 MG tank sensing the level within the tank and then sending a signal to a receiver -at the treatment plant : starting and stop = =_ _ ping :the high service p�anps. The 70 gpm well, which is located adjacent to the building, will be piped directly into the clear well. All of the treatment facility will bebuilt_withjn.. an existing commercial building within the West Glenwood service area. The necessary local permits have been obtained to utilize the build- ing for water treatment plant purposes. WEST GIEtWOOD WATER DISTRICT 1985 METER READINGS MONTH ADF (gal/day) JANUARY .262 FEBRUARY .280 MARCH .257 APRIL .328 MAY .401 JUNE .790 JULY .674 AUGUST .713 SEPTEMBER .553 OCTOBER .280 NOVEMBER .247 DECEMBER .301 OPERATING SEQUENCE A. BACKWASH OPERATION 1. Pressure differential of 25-30 psi initiates backwash cycle. 2. Lockout turbidity alarm. 3. Close filter inlet B1, stop inlet pump P1, close chlorine solenoid valve S1, stop body feed pump, clse body feed valve G1, close outlet valve Al. 4. Open filter backwash valve Cl, open precoat vent valve E1 (tank drains). 5. Close filter backwash valve C1, open backwash pump valve F1, close precoat vent E1. 6. Start backwash pump (pressurize tank to 70 psi). 7. Close backwash pump inlet valve F1, stop backwash pump. 8. Open backwash filter valve C1 (backwash filter). 9. Repeat steps 5 - 8 to backwash filter second time. 10. Close filter backwash Valve C1. 11. Backwash cycle complete, begin precoat. B. PRECOAT CYCLE 1. Open precoat inlet valve H1, open precoat vent Valve E1 (gravity feed precoat into filter). 2. Open backwash pump valve F1, start backwash pump (coat filter for 5-10 minutes). 3. Start recirc pump. 4. Close backwash pump valve F1, shut backwash pump. 5. Open outlet valve Al. 6. Shut precoat vent valve E1. 7. Open filter inlet valve B1, start pump P1, shut recirc pump, open chlorine solenoid S1, open body feed valve, start body feed pump. Filter in normal operation until backwash cycle initiated. LM:1501 SUPERSEDES SK•18 OUTLET PARTS LIST IWF FILTERS FOR STANDARD CONSTRUCTION AND BOLTING FILTER AID OUTLET & VENT PART NO. PART NAME 802 COVER ASSEMBLY FILTER AID INLET INLET BACKWASH OUTLET - 1 GUI ECID .41 8069 7556 8137 6300 NIPPLE PRESSURE GAUGE ELBOW HEX NUTS - COVER 7108 COVER GASKET RUBBER 6321 HEX NUTS 7674 TUBE CLAMP 804 TUBE SHEET 7022 TUBE GASKET RUBBER 7108 7695 7694 7693 5000 7556 =� 8137 8069 11010 WHEN ORDERING PARTS, STATE FILTER SIZE d SERIAL NUMBER. 6959 7666 7022 11013 S 5.11 SHELL GASKET RUBBER SUSPENSION ROD (REQUIRED ON 53 A. 94 ONLY) SUSPENSION ROD (REQ'D. ON 129, 169, 197, 238 ONLY) SUSPENSION ROD (REQUIRED ON 197 8 238 ONLY) MACH. BOLTS - COVER PRESSURE GAUGE ELBOW NIPPLE PORO STONE TUBE - 24" LG. SET SCREW TUBE SPIDER TUBE GASKET RUBBER PORO-STONE, TUBE - 18" LG. (REQUIRED ON 197 & 238 ONLY) 7022 TUBE GASKET RUBBER 7672 TUBE CLOSURE PLATE 11010 PORO-STONE TUBE -24" LG, 80.1 SHELL ASSEMBLY 800 COMPLETE ASSEMBLY R. P. ADAMS COMPANY, INC . BUFFALO 17, N. Y. SS -18060 DATE: S-I5�I0 5.15-70 SUPERSEDES TD -22001 11.15.61 OPERATING INSTRUCTIONS ADAMS "IWF" FILTERS FOR I GENERAL The filtration equipment covered by these Operating Instructions consists of• Two ( 2 IWF – 238 filter(s) haulm plant flow rate is g 1 Z§ . • • • sq. ft. of filtering surface per filter. The filter gpm equivalent to a unit flow rate of gpm/,sq. ft. II OPERATING SEQUENCE A PRECOATING: Filter aid, in the amount shown in the table below, is thoroughly mixed with filtrate and placed in the precoat pot or precoat mix tank. This slurry is then recirculated through the filter and evenly distributed on the out- side surface of the filter tubes. Initially the sight glass or precoat mix tank will appear cloudy, rapidly clear- ing as precoat forms. When sight glass or mix tank appears clear, recirculation has been com leted and e ment is ready for filtration cycle.f_ P quip- IWF I 53 I 94 I 129 I 169 197 238 e 6 10 14 18 21 25 B FILTRATION & CONTINUOUS FEED: The filtration cycle is started by opening the inlet and outlet valves to establish circulation before discon- tinuing precoat operation. The removal_ of dirt _from the filtrate _b _the-. precoat -loss as. indicated assure y pracoaF results �n_iapidly�ecreasir�== - pressure meet for -maintaining by Pr gaffs. A continuous feed of filter aid slurry - may be admitted to the feed should or started ling c ike porosity by separating the solids to be removed. Introducing th* continuous - feed and continued throughout the filtration cycle. NOTE: Chlorination mast always be practiced on water service to kill algae. - C BACKWASH When the pressure drop across the filter reaches a 25 psi. the filter must be cleaned. This is accomplished by bockwashing. A reversal of flow at high velocity must be created to thoroughly clean the filter. Air is compressed in the high head. This expandable air head forces the liquid through the tubes in a reverse direc- tion at the necessary high velocity by use of the quick opening backwash valve. 111 SPECIAL INSTRUCTIONS A FILTER OPERATION: 1. Never operate filters without proper application of prescribed amount of filter aid. (See TD 2. On water service, chlorination must be practiced to prevent algae growth inside filter. 3. When precoat application has been completed, flow through filters must be maintained at all times. If stoppage of flow occurs due to power failure or other causes, THE FILTERS MUST BE BACKWASHED AND PRECOATED BEFORE RESUMING FILTRATION. 4. On filter plantshaving hold separate precoat pump, the bypass circuit illustrated by dotted lines on Dwg... . 'n ng system. Customer must supply the pi in a p g red valves indicated in the event of no -flow periods. Operation of the _hold_ system is as follows. After completing the precoat operation,open valve Hand close valves G and F. Place filter No. 1 on line by opening valves Al and 81. 5. Never exceed rated capacity of filters. B SLURRY FEED PUMP OPERATION: 1. Slurry feed pumps are positive displacement type. Whether the are multi -head or individual units it is imperative that all valves be open before starting motor. CAUTION: Do not use needle valve on slurry discharge line. Connect flush line to main pump discharge, or to .suitable flush liquid supply. 2. Always flush slurry pump before shutingdown. (Not Required On Units Having Automatic Flushing Device) 3. Special manufacturers' instructions are furnished with the slurry and chemical feed pumpfor your guidance. C LUBRICATION: Properly lubricate all pumps, motors and valves in accordance with manufacturers' instructions. CAUTION: Adjust pump pocking to permit constant water leakage unless pump hos mechanical seal. NOTE: Do not experimremt with operating procedures other that those described is these instructions without consrdting factory for approval. R. P. ADAMS COMPANY, INC. BUFFALO, N.Y. 14217 TD -22001 . DATE 41.1$-3 IV , VALVE SEQUENCE: A PRECOAT APPLICATION (Dwg. No..TD:-20.25.9..): 1. On initial start up, one filter in the battery may be precoated by filling with row liquor. The remaining filters ore to be filled with filtered liquor from filter No. 1. 2. Filter No. 1 will be referred to below. 3. Open inlet valve B1 and vent valves El and G allowing filter to fill with raw liquid. 4. When precoat mix tank becomes half -full, close inlet valve B1. 5. Place .. lbs. of filter aid in precoat mix tank and start mixer. After thorough mixing start precoat pump and open valves D1 and F. 6. The precoat slurry will now recirculate through filter No. 1. Recirculate until mix tank shows clear. 7. Filter No. 1 is now precoated and ready for placing on line. See Section B of these instructions for this procedure. 8. Filter No. 2 may be filled with filtered liquid from filter No. 1 by opening outlet valve A2 and precoat valves E2 and G. This will allow filtrate to come from the outlet of filter No. 1 to filter No. 2 and vent through valves E2 and G into the mix tank. 9. When filter No. 2 is filled as per Item 8, precoating may be accomplished as per the above. B FILTRATION: 1. When mix tank shows clear, partially open inlet valve B1, outlet valve Al and close valves D1, El, F, and G. 2. Open Al and B1, and readjust main discharge valve at gpm. 3. See Special Instructions if no -flow periods may occur. 4. CONTINUOUS FEED (a) If precision pump is supplied, follow instructions on SK 20609 enclosed. Place 25 lbs. filter aid in mix tank as starting point. See No. 5 below. (b) For slurry pumps other than precision, see drawing and follow steps below. 1. Fill mix tank half full and start mixer. 2. Add 50 lbs. of filter aid. 3. Fill mix tank to 4 inches from top. 4. Open slurry pump discharge valve - NEVER OPERATE PUMP WITH THIS VALVE CLOSED. If multi head pump is supplied be sure all valves are open. - 5. osition 3 way valve .1 to allow slurry to flow from mix tank to slurry feed pump. 6. Start slurry -pump. Set for apx. 10 gph flow. - 7. The amount of filter aid added to mix tank may be varied with changes in filtrate supply. When small amounts of contamination are present in the filtrate less filter aid will be required whereas greater contamination may require increased filter aid. Experience is the best indication. C BACKWASH: (a) USING SYSTEM PRESSURE When pressure drop reaches 25 psi. filters must be backwashed. Filtered water from on line unit is utilized for this operation in following steps. 1. Close filter inlet valve B1 and outlet valve Al for filter No. 1. 2. Open backwash valve Cl, precoat valve El and valve G allowing filter to drain completely. Close backwash valve Cl, precoat valve El, and vent valve G. Open outlet valve Al,.allowing pump to force water into filter until pressure gauges indicate maximum pressure. (Not more than 70 psig or less than 45 psig.) 5: Close outlet valve Al.. 6. Open backwash valve Cl with one quick turn. 7. When filter is completely drained, close backwash valve Cl. THE BACKWASH ACTION SHOULD REVERSE THE FLOW WITH CONSIDERABLE VIOLENCE TO EFFECTIVELY CLEAR THE PORES OF THE FILTER TUBE OF PRECOAT FILTER AID. IF LESS THAN 45 LBS. REGISTERS ON PRESSURE GAUGES AT THE START OF THE BACKWASH PROCESS, NO CLEANING WILL TAKE PLACE. 10. Repeat above operations for remaining filters. 11. Filter is now ready for precoating and returning to service. (b) USING PLANT COMPRESSED AIR OR GAS When pressure drop reaches 25 psi. filters must be backwashed. Dome of filter is drained to proper level, and plant compressed air establishes proper backwash conditions for unit. 1. Position 3 way valve J to flush slurry feed pump clear, if all filters are removed from service. (Not Required On Precision Pump) 2. Stop slurry feed pump if all filters are removed from service. 3. Close filter inlet valve Bl and outletvalveA1-for-filter No. 1 4. Open dome drain valve Ml and valves El and K allowing compressed air to drive liquor from dome. 5. Close M1 and El when air blows through Ml. 6. When pressure in dome reaches 60 psig, close K. 7. Open Cl with one quick turn. . 8. When filter is completely drained, dose backwash valve Cl. THE I}ACKWASH ACTION SHOULD REVERSE THE FLOW WITH CONSIDERABLE VIOLENCE TO EFFECTIVELY CLEAR THE . PORES OF THE FILTER TUBE OF PRECOAT FILTER AID. IF LESS THAN 45 LBS. REGISTERS ON PRESSURE GAUGES AT THE START OF THE BACKWASH PROCESS NO CLEANING WILL TAKE PLACE. 9. Repeat, above operations for additional filters in plant. 10. Filter is now ready for precoating and returning to service. R. P. ADAMS COMPANY, INC. BUFFALO 17, N. Y. TD -22004 DATE 11-15.61