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Home My WebLink AboutCLOGIA LT 16Clogia Lot 16 #014-091-33 Municipality of Anchorage P.O. Box 196650 · 4700 Elmore Road Anchora,qe, Alaska 99519~6650 · (907) 343-7904 · Fax (907) 343-7997 http:llwww.muni.or,qlOnsite Development Services Division On-Site Water and Wastewater Proqram **** VARIANCE/WAIVER REVIEW **** WaiverS: OSP12113t COSA#: PID#: 014-091-33 Legal Description: Cloqia, Lot 16 Engineer: Anderson EnRineerin.q Permit¢: Applicant: Anderson En.qineerin(3 Your request for a waiver of the required 75 feet horizontal separation from the public sewer trunk to the private well has been approved. The approved separation distance is 44 feet. This waiver approval applies to the proposed public sewer trunk line oaly. [] The affected adjacent property owner(s) have been given a 7 day notice regarding this waiver. [] Notarized letter(s) of nonobjection have been received from the owner(s) of the affected adjacent property. [] Adjacent properties are not affected by this waiver. Waiver is Granted: X Waiver is not Granted: Date: ~/,¢ O//~ Approved b '~- .: · ~//" N&me of Reviewer Rec#:OO~-~'l~/ ~. Amount¢,/0¢'0- Date Paid: **** VARIANCE/WAIVER REVIEW **** ANDERSON ENGINEERING P.O. BOX 240773 ANCHORAGE, AK 99524 522-7773 677-7766 (FAX) June 11, 2012 Municipality of Anchorage Development Services Department On-Site Water and Wastewater Program 4700 Elmore Road Anchorage, AK 99519-6650 Attention: On Site Services Engineer Subject: Lot 16, Clogia Subdivision Separation Distance Waiver Well to Sewer Main/Manhole Dear On Site Services Engineer: A new 8" sewer main is currently being placed along Kovey Street off of East 72nd Avenue. The main is composed of C900 DR18 PVC material. This sewer main will be placed 45' from the well on Lot 16, Clogia Subdivision. A waiver is required to allow placement of the main less than 75' from the well. The well on Lot 16 is 101' deep with casing the entire depth. The well is drilled through what appears to be silty sand material with silt lenses at depth. The aquifer level is not encountered until 98' below the ground level where the pump is placed. The static water level was found at 40' below the surface and more than 32' below the bottom elevation of the sewer main. The material utilized in the construction of the water main has a minimum wall thickness of .503 inches and a minimum bell thickness of .562 inches. The connection between joints includes a rubber gasket and when properly installed create a watertight joint. The sewer main will be pressure tested to verify no leaking can occur. In addition to the gasket seal all joints within 75' of the well will be totally encased in concrete to insure no leakage of effluent can occur. The sewer main will operate at atmospheric pressure so leaking is virtually impossible without a cataclysmic event. The ground surface from the well flows away at an approximate 10% grade toward Kovey Street and the sewer main. Any overflow of the sewer system that could occur would be contained in the ditch to be constructed along Kovey Street or the storm drain also to be constructed. Kovey Street will be constructed to half street standards with a ditch along the north side and curb and gutter on the south. A storm drain will be constructed full length of the street. The owner of the well on Lot 16 does not wish to connect to the AWWU water system. It would appear based on materials used for the new sewer system that any contamination threat to the well is very remote. We therefore request the waivers be issued allowing the new sewer main and manholes to be constructed as stated above. Lot 16, Clogia Subdivision June 11, 2012 Page 2 of 2 Attached are drawings showing the proximity of the existing well to the new sewer main. Also included are the specifications for the C900 SD18 PVC pipe and the manholes slated for use. A waiver issued by ADEC for Lot 2, Clogia for a similar circumstance is provided for your review. Michael E. Anderson, P.E. Attachments ANDERSON ENGINEERING June 20, 2012 Municipality of Anchorage Development Services Department On-Site Water and Wastewater Program 4700 Elmore Road Anchorage, AK 99519-6650 Attention: On Site Services Engineer Subject: Lots 13 and 16, Clogia Subdivision Separation Distance Waiver Well to Sewer Main/Manhole Sewer Main Joint Encasement Sepcifications Dear On Site Services Engineer: All sewer main joints within 75' of the private well must be encased in concrete. The encasement must be a minimum of 6" thick around the entire outer circumference of the pipe. Concrete must be placed monolithically and extend a minimum of 3' in each direction of the joint for a total length of 6'. Concrete shall have a minimum compressive strength of 3,000 PSI. Sincerely, Michael E. Anderson, P.E. Attachments I LOT 16 Privote Well 315.50 LF 8" C900 DR-18 PVC SD SD KOVE¥ STF~EET W W W PLAN VIEW .....~ 45' S[otic Woter Level 40' [×isting Well 7100 Kovey Street Totol Depth 101' Cosing Depth 100' PROFILE AS-BUILT SCALE 1" = 20' Aarow Pump & Welj Service, LLC P,O, Box 110496 ARchorsge, AK 99511 Office: (907 346-9355 · Fax (907) 333-88~ Eagle River: (907) 622-9335 [ti'~~ · No. 940 CUSTOMER JOB SITE *QU~NTITY DESCRIPTIO~ PRICE AMOUNT lABOR HOURS RATE AMOUN~ TOTAL MATERIAl TOTAL LABOR RK ORDERED 8Yl DA~E C~MR' fOTALLABOR .... ar~k You SIGNATURE lereby Acknowledge the Satisfactory Completion of the Above Described Work and agree that if above work is not paid for in 90 days I agree to allow Aa Pump & Well Service, L, LC. the rigbt to remove undaid for equipment and chargo for labor &lready performed & labor to remove unpaid for equipment.) TERMS: ACCOUNTS PAYABLE AT 10TH OF MONTH FO LLOWING PURCHASE. SERVICE CHARGE AT RATE OF 1.5% PER MONTH WILL BE CHARGED ON OVERDUE ACCOUNTS. Physical Requirements for AWWA C900 Pipe Material: Pipe compound shall meet cell class 12454 per ASTM D1784 "Standard Specification for Polyvinyl Chloride (PVC) Compounds and Chlorinated Polyvinyt Chloride (CPVC) Compounds." Standard Laying Lengths: Standard laying lengths shall be 20 ft. (±1 ") for all sizes. Hydrostatic Test: Each length of pipe, including the joint, shall be tested to four times the pressure class of the pipe for a minimum of 5 seconds at the pressure listed in the table below. PC 100 DR2S 400 psi PC 150 DR18 600 psi PC 2OO DR14 800 psi Quick Burst Test: Randomly selected samples tested in accordance with ASTM D1599 shall withstand the pressures listed below when applied in 60 to 70 seconds. Pipe Stiffness (F/Ay): The pipe stiffness for PVC Municipal Water Pipe is listed in the table below. OR14 815 psi Agency Listings: Underwdter's Laboratory (UL) Factory Mutual (FM) ANSI/NSF 61 Short Form Specification for AWWA C900 Scope: This specification designates general requirements for Polyvinyl Chlodde (PVC) water distribution pipe in sizes 4-inch through 12-inch, with integral bell and spigot joints for the conveyance of water and other liquids, Pipe: Pipe shall meet the require- ments of AWWA C900 "Polyvinyl Chloride (PVC) Pressure Pipe and Fabricated Fittings, 4-Inch through 12-Inch, for Water Distribution." Other Requirements: · Provisions must be made for ex- pansion and contraction at each joint with an elastomeric seal. · The bell shall consist of an integral thickened wall section with an elas- tomeric seal. The wall thickness in the bell section shall conform to the requirements of Section 6.2 of ASTM D3139, "Standard Specification for Joint for Plastic Pressure Pipes Using Flexible Elastomeric Seals." · When used for potable water systems, pipe shall meet the re- quirements of ANSI/NSF 61 "Drink- ing Water System Components - Health Effects." · The pipe shall be manufactured to cast iron outside diameters (CLOD) in accordance with AWVVA C900. · The seal shall meet the requirement of ASTM F477 "Standard for Elas- tomedc Seals (Gaskets) for Joining Plastic Pipe." Physical Requirements for AWWA C905 Material: Pipe compound shall meet cell class 12454 per ASTM D1784 "Standard Specification for Polyvinyl Chloride (PVC) Compounds and Chlorinated Polyvinyl Chloride (CPVC) Compounds." Standard Laying Lengths: Standard laying lengths shall be 20 ft. (±1 ") for all sizes. Hydroststio Test: Each length of pipe, including the joint, shall be tested to two times the pressure rating of the pipe for a minimum of 5 seconds at the pressure listed in the table below. PR 165 I OR2S 83O psi PR 235I DR18 470 psi Agency Listing: ANSI/NSF 61 Short Form Specification for AWWA C905 Pipe Scope: This specification designates general requirements for Polyvinyl Chloride (PVC) water transmission and distdbutioa pipe in sizes 14-inch through 24-inch, with integral bell and spigot joints for the conveyance of water and other liquids. Pipe: Pipe shall meet the require- meats of AWWA C905 "Polyvinyl Chlodde (PVC) Pressure Pipe and Fabricated Fittings, 14-inch through 48-inch, for Water Transmission and Distribution". Other Requirements: · Provisions must be made for ex- pansion and contraction at each joint with an elastomeric seal. · The bell shall consist of an integral thickened wall section with an ales- tomeric seal. The wall thickness in the bell section shall conform to the requirements of Section 6.2 of ASTM D3139, "Standard Specification for Joint for Plastic Pressure Pipes Using Flexible Elastomedc Seals." · When used for potable water systems, pipe shall meet the re- quirements of ANSI/NSF 61 "Drink- ing Water System Components -- Health Effects." · The pipe shall be manufactured to cast iron outside diameters (CLOD) in eccordanca with AWWA C905. · T~e seal shall meet the require- ments of ASTM F477 "Standard for Elastomeric Seals (Gaskets) for Join- ing Plastic Pipe." The Sealing System PW Eagle's joints employ gasket systems that have excellent track records in the field, The joining systems are factory-made with rubber gaskets installed in the ring groove at the time of manufacture. The gaskets are designed to retain in the ring groove. When assembly technique is consistent with PW Eagle instructions, the secured gasket systems will not displace. The gaskets are classified to ANSI/ NSF Standard 61. Cross-Sectional Views The following drawings show the cross-sectional views of the pipe before and after assembly, When the pipes are pushed together the rubber in the seal is compressed. Compression gives rise to a sealing pressure that acts on the socket and spigot as shown in the illustration below. Gasket in place. Gasket after pipe joining, Sealing NOTE: Gasket drawings are representations. Actual gaskets may vary from drawings Installation Advantages of the PW Eagle Joint The gasket is factory installed, so there are no gaskets to install on the job site, This avoids the possibility of installing the wrong gasket or improperly installing the correct gasket. The installer should leave the factory-installed gasket in place and simply follow PW Eagle Joint Assembly instructions for problem- free joint performance. Installation Standard AWWA C900 and C905 pipe should be installed in accordance with AVWVA C605 "Underground Installation of Polwinyl Chloride (PVC) Pressure Pipe and Fittings for Water." Joint Assembly PW Eagle's C900 and C905 pipe will arrive on the job site with the gasket installed at the factory, ready for assembly. Assemble as follows: 1. Inspect the bell and remove any foreign matter such as mud, sand or ice. DO NOT REMOVE THE GASKET FROM THE PIPE. 2, Clean off the spigot end of the pipe and apply lubricant evenly, covering the beveled nose and sealing surface up to the stop mark. NOTE: Use only lubricant supplied by PW Eagle - the use of other lubricants may cause deterioration of pipe or gasket, 3. Place the beveled end in the companion bell and provide straight alignment. 4. Push the pipe straight into the bell with a block and bar until the stop mark on the spigot is even with the end of the bell. 5. NOTE: DO NOT ASSEMBLE THE JOINT BY SWINGING OR STABBING. 6. NOTE: For larger sizes of pipe, additional mechanical assistance (such as a come-along or hydraulic jack). DO NOT ASSEMBLE THE JOINT USING A BACKHOE BUCKET'. 7. Allowable axial deflection at the joint varies with each manufacturer's design. For PW Eagle products, allowable deflection is two degrees. For more information, see PW Eagle's technical bulletin "Gasketed Pipe Assembly." Gasketed AWl/VA C900 & C905 Transmission & Distribution pipe ~ the clear choice for municipal applications. Tapping PVC - C900 PW Eagle's C900 and 0905 pipe may be tapped either dry or under pressure. There are three types of tapping equipment and methods, 1. Direct Tapping The only pipes that may be direct- tapped are C900 DR14 and DR18 in sizes 6-inch through 12-inch. When direct tapping, follow the procedures in Uni-Bell's Uni-B-8 "Recommended Practice for the Direct Tapping of Polyvinyl Chloride (PVC) Pressure Water Pipe." 2. Saddle Tapping All sizes and DRs of C900 and C905 may be saddle-tapped. Maximum tap size is 2 inches for saddles, Service clamps or saddles used with PVC pipe must: a. be designed for use with ClOD PVC pipe b. provide full support around the circumference of the pipe c, provide bearing area of sufficient width along the axis of the pipe (minimum 2-inch width for taps up to 1 inch diameter; minimum 3-inch width for taps 11/4 to 2 inch diameter) 3. Tapping Sleeve or Valve All sizes and DRs of C900 and C905 may be tapped using a tapping sleeve or valve. For connections greater than 2 inches in diameter, this method is required. Maximum connection is size-omsize. V - For field cuts, draw a stop mark (line "V") by subtrscting 5/8~ from bell length "C", WARNING: Do not use PVC pipe to con- vey air or other gases under pressure. If failure should occur, the result would be catastrophic. Rapid expansion of the compressed gas would send shards of plastic over a wide area and could result in serious injury or death. Nominal Average Approx Min Wall Min Sell Approx Approx Approx Pipe Size DR Pipe OD Pipe ID Thickness (t) Thickness (tl) Bell OD Weight W~ght (inches) (inches) (inches) (inches) I~nches) (inches) {Ibs/lOOffl ~bs/po) 4 25 ,~80 4,42 .192 ,267 6~/~ 190 38 4 18 4.80 4.27 .267 .298 6~/~ 260 52 4 14 4~80 4.11 .343 ~94 ~/B 320 64 6 25 6.90 6,35 .276 .300 9¢~ 390 78 6 14 6.90 5.91 .493 .567 ~/~ 670 134 6 25 9,05 8,33 ~362 .895 12~A 670 t34 8 14 9.05 7,76 .646 .743 12V~ ~fTSO 230 10 25 11.10 10.21 .444 .483 147h 1010 202 10 14 11.10 9.51 .793 .912 147A 1730 346 12 25 13.20 12.14 ,528 .574 17~ 1420 2~ 12 18 13.20 11.73 .733 .820 17~ 1940 388 i2 14 13~20 il,31 :948 1.0~5 17~ 2450 490 14 25 15.30 14.08 .612 .666 19~h 18~0 378 14 18 15.30 13~68 .~aO .9~0 1~.~ 2580 516 16 18 17,40 1547 .967 1 ;095 2t ~ 3~0 676 18 25 19.50 17.83 .780 .852 24% 3110 622 18 18 19.50 17,18 1.083 i.225 24~ 4250 ~ 20 25 21.60 19.75 .864 .943 267~ 3840 768 20 18 i 21.60 19.0~ 1.200 1.35~ 5250 t050 24 25 25,80 28.59 1.092 1.127 311,& 5440 108~ Custot'~ter Service Centers Oregon 800-347-0200 Missouri 800-341-0053 Fax 541-686-9257 Fax 573-474-1760 West Virginia 800-624-311 1 Fax 304-472-0742 DEPT. OF ENVIRONMENTAL CONSERVATION DIVISION OF ENWIRONMENTAL HEALTH DRINKING WATER PROGRAM 555 CORDOVA STREET ANCHORAGE, AK 99501 http ://www.state.ak.us/dec/home/htrn Telephone: (907)269-7696 Fax: (907) 2694655 October 31, 1997 RECEIVED M~', Kenneth G. Long, R.LS. 1731 George Bell Circle A ' nchorage, Alaska 99515-3957 NOV 10 1991 t~unictpality of Anchorage Oept. Health & Human Servican Subject: Clairmont Subdivision: Separation Distance Waiver between Private Well on Lot 2, Clogia Subdivision and Sewer Collection Line for Clairmont Subdivision; ADEC Plan Review Number: 982 t-WV-2 t 2-010; Review Dear Mr. Lung: I have reviewed information provided by Anchorage Water & Wastewater Utility (AWWU), Engineeriug Division which w:~s submitted in response to items found in my September 24, 1997 letter. Based on this review and have found that the submitted waiver request justifiable. Therefore, in accordance with the provisions of State Drinking Water and Wastewater Regulations (I8 AAC 80.030 and 18 AAC 72.015), the following separation distances are granted: Between the existing private source well located on Lot 2, Clogia Subdivision and the sewer tine from 100 feet to 55 feet at the closest point. Between the existing private source well located on Lot 2, Clogia Subdivision and the manhole (C-7 on the submitted plans) from 100 feet to 55 feet, These waivers are valid if the following requirements are met before AWWU accepts the sewer line for service: The existing manhole C-7 be mod/fled as shown on plans submitted to this office with your July 31. 1997 submittal. The existing sewer kine with/n the protective radius will be exposed and any joints be secured with field lock fittings, as also shown on plans submitted to this office with your July 31, 1997 submittal. Mr. Kenneth G. Lang, R.L.S. 2 October 3t., 1997 This approval does not imply the granting of additional authorizations, nor obligate any federal, state, or local regulatory body to grant required authorizations. Thank your for your cooperation with this Department. If you have any questions, please contact me. Keven K Kleweno, P.E. Environmental Engineer KKK,'cf cc: Wayne Bennett, AWWU Jim Cross, P.E.; DHHS 7. Check all around pipe for rolled or "fishmouthed" gaskets after coupling. 8. Do not pick up and drop coupled pipe to adjust grade. 9. Ensure that the pipe is not supported only at the bell nor is the pipe barrel resting on a high spot. The bottom quarter of the pipe shall be uniformly supported through its length in order for the pipe to resist the design loads. F. Laying Instructions for Other Pipe All other pipe shall be laid in accordance with the manufacturer's published recommendations-- .-~-...~_ ..~ ~ ' ~-'~ lhe Contractor shall clean and flush all sanitary se p'p installed prior to testing and substantial completion inspection. Sewer main and service trenches shall be substantially backfilled and compacted. Ail sanitary sewer pipe installed shall be subiect to either an infiltration test or an exfiltration test. In those areas where, in the opinion of the Engineer, the water table is high enough to subject the pipe to a satisfactory infiltration test, it is not anticipated that an exfiitration test shall be required. In checking leakage, thoro will be no allowance made for external hydrostatic head. Where in the opinion of the Engineer, the water table is not high enough to provide a satisfactory infiltration test, an ex'filtration test shall be required. The type of test (either infiltration or exfiltration) shall be determined by the Engineer. The Contractor shall have the option of choosing only one method (air or water) of testing for each section tested. All wyes, tees, or ends of side sanitary sewer stubs and service connections shall be plugged or capped and the plug or cap shall be securely fastened to withstand the internal test pressures. Such plugs or caps shall be readily removable and their removal shall provide a socket suitable for extending the lateral connection. All testing shall be considered a subsidiary obligation under Furnish and Install Pipe and is considered incidental to the Contract. The Contractor shall take precaution to prevent sewage from entering the new sanitary sewer pipeline until it has been inspected, tested and accepted for operation by the Engineer. The Contractor may request inspection, testing and acceptance of incremental segments of the Work. An incremental segment shall be considered a mainline sanitary sewer with a completed manhole or cleanout at each end. B. Ex'filtration Test (Using Water) On completion of a section of sanitary sewer between manholes or otherwise, the Engineer shall require that the ends of all pipe be plugged, including service Page 9 R2 Standard Construction Specifications Division 50 - Sanitary Sewers Rev 2 2009 MASS 3/12 connections, and the pipe subjected to a hydrostatic pressure. Generally all testing is to be conducted after backfilling, pdor to resurfacing and after service connections are made. A minimum head of six feet (6') of water above the crown at the upper end of the test section shall be maintained for a period of four (4) hours during which time it will be presumed that full absorption of the pipe body has taken place and thereafter for a further period of one (1) hour for the actual test of leakage. During this one-hour pedod, the measured loss shall not exceed the rate of fifty (50) gallons per inch diameter per mile per twenty-four (24) hours. The above listed leakage rate shall also be applied to infiltration from ground water and infiltration or exDtration in greater amounts will be cause for rejection of the sanitary sewer and all repairs necessary to meet these requirements and retesting shall be at the expense of the Contractor. The maximum length of sanitary sewer for the above allowable leakage test shall be one thousand feet (1,000'). If it is not apparent that leakage test results between any two (2) manholes is satisfactory, then the Engineer may require subsequent tests to establish the more exact location of the leakage areas. Any section of sanitary sewer between any two (2) manholes that does not meet the above requirements shall be rejected and the Contractor, at his expense, shall make the necessary repairs to the sanitary sewer to meet the requirements, and shall make subsequent tests after repairs to assure compliance with the Specifications. Ex'filtration Test (Using Air) The Contractor shall furnish all facilities and personnel for conducting the test under the observation of the Engineer. The equipment and personnel shall be subject to the approval of the Engineer. Joints only may be tested in pipe thirty-six inches (36") in diameter, or larger at the option of the Contractor. The Contractor may desire to make an air test pdor to backfilling for his own purpose. However, the acceptance air test shall be made after backfilling has been completed, and compacted. Immediately following the pipe cleaning, the pipe installation shall be tested with Iow-pressure air. Air shall be slowly supplied to the plugged pipe installation until the internal air pressure reaches four (4.0) pounds per square inch greater than the greatest back pressure of any ground water in contact with the pipe. At least two (2) minutes shall be allowed for temperature stabilization before proceeding further. The pipeline shall be considered acceptable when tested at an average pressure of four (4.0) pounds per square inch greater than the greatest back pressure of any ground water in contact with the pipe, if: The total rate of air loss from any section tested in its entirety between manholes or between manholes and cleanout structures does not exceed two (2.0) cubic feet per minute, or the following table may be utilized as a guideline for a satisfactory test by air for pipe sizes shown: Page 10 R2 Standard Construction Specifications Division 50 - Sanitary Sewers Rev 2 2009 MASS 3/12 Allowable Pressure Pipe Diameter Drop in 10 Minutes 8" 2.7 PSI 10" 2.1 PSI 12" 1.8 PSI 15" 1.4 PSI 18" 1.2 PSI 24" 0.9 PSI Pressure gauges shall be incremented in not more than 1/2 pound increments for accurate tests. If the pipe installation fails to meet test requirements, the Contractor shall determine at his own expense the source or sources of leakage, and he shall repair (if the extent and type of repairs proposed by the Contractor are acceptable to the Engineer), or replace all defective materials or Workmanship. The completed pipe installation shall meet the requirements of this test or the alternative water ex'filtration test before being considered acceptable. Safety braces shall be required to hold plugs in place and to prevent the sudden release of the compressed air. Due to the large forces that could be exerted by an escaping plug during the testing of the pipe, workmen shall not be allowed in the manholes in which plugs have been placed while tests are being conducted. The Contractor's testing equipment shall be arranged in such a manner that a pressure relief device will prohibit the pressure in the pipeline from exceeding 10 PSI. Infiltration Test Infiltration testing may be allowed at the Engineer's option when the natural ground water table is six feet (6') above the crown of the higher end of the test section. The maximum allowable limit for infiltration shall not exceed the rate of fifty (50) gallon per inch diameter per mile per twenty-four (24) hours. The Contractor shall furnish all tools, equipment, and labor necessary to complete the tests and shall verify from his own observations, or preliminary tests, that each line conforms with this Specification before requesting the Engineer to observe and record the actual leakage. The Engineer may require the Contractor to repair obvious leaks even though the total length of the test section falls within the maximum allowable leakage for the test used. Page 11 Standard Construction Specifications Division 50 - Sanitary Sewers Revised 11/08