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Home My WebLink AboutZODIAK MANOR ALASKA Lid 154Zot) K Anchors. ge POUCI-1 o~650 ANCHORAGE, ALASKA 99502-0650 (907) 264-4111 TONY I(NOWL[ MAYOR DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION March 18, 1985 David Hamner Ott Water Engineers, Inc. 4446 Business Park Blvdo, Bldg. A Anchorage, Alaska 99503 Reference: Zodiak Manor LID 154 Dear David: We recently completed a review of geotechnical data and construction techniques for the planned Zodiak Manor LID, as supplied by Ott Water Engineers. At issue :ts whether a WID will also be required, or whether it would be possible to waiver the separation distances between private wells and the planned sewer line (75 feet), cleanout (100 feet), or manhole (100 feet) as the case may be. The long-term protection of the water supply in this area is the fundamental issue, both from a standpoint of protecting the dri~¢ing water supply of the immediate property owner, and protection of the aquifers serving this region° Untreated raw sewage will be a source of bacterial, viral or chemical con- tamination unless consistently contained and transported off-site. A properly operating on-site disposal system, on the other hand, will treat or remove 100 percent of the bacterial or viral components in most cases, but will only reduce or chemically alter certain organic and inorganic constituents while leaving other and perhaps more toxic components unaltered. Positive factors lending incentive towards the continued use of private walls include the following. Deep well construction. The drinking water aquifer and static head are not in close proximity to the ground surface. Well replacement would also be costly. 2. Pressure mains will not be involved, gravity flow will be utilized. Special construction techniques are proposed, including sealed manholes, tyton Joints on ductile iron pipe where gasketed flanged fittings are not used, and polyethylene-based (shrink-to-fit) sleeves over all joints to assure water tightness. Well casings in close proximity to the sewer line, manhole, or cleanout could be grouted° David Hamner Ott Water Engineers, Inc. March 18, 1985 Page 2 Geotechnical data is generally favorable° Additional fill could be brought in and compacted where necessary for greater soil stabilization° Information extrapolated from well logs frequently indicated several dense soil strata v~th a high silt/clay content that may provide some protection for the drinking water aquifer° 5. A 25-foot separation is currently considered adequate between a private well and a private sewer line, without special construction techniques. 6. If a well had to he abandoned and re-drilled, an improperly and incomplete abandonment may not provide the expected level of protection to the aquifer. Negative factors not lending support to continued use of private wells include the following. 1o The number of wells closer than 50 feet to the planned sewer line is significant, with several closer than 30 feet. 2° The fact that even the best construction techniques and frequent inspec- tions during construction ~Jll not absolutely guarantee the theoretical limit of protection. The life of the project is indefinite at this time. Throughout the pro-- ject life-time, the possibility of contaminating a water supply will increase. ° A shallow ground water table is not shown to be present. Therefore, an external static head ls not present and exfiltration of sewage could occur rather than infiltration of ground water through any bre~o The importance of the LID is clearly understood. High density development and small lots will make it exceedingly difficult for finding adequate replacement sites for on-site wastewater disposal. A properly constructed and operated sanitary sewer system will provide greater protection for private water supplies and reduced health risks than a properly constructed and operated on-site wastewater disposal system. The potential danger of contaminating the potable water aquifer supplying this area continuously increases as the existing on-site wastewater disposal systems deteriorate v~th age and use° Given the proposed construction techniques cited earlier, and taking into account the positive and negative factors also listed above, we would support waivering the required separation distance down to 30 feet. Wells closer than this should be properly abandoned and re-drilled at a greater distance by what- ever mechanisms the parties involved agree to. David Hamner 0tt Water Engineers, InCo March 18, 1985 Page 3 If ADEC is concerned with or has reserw~tions about granting waivers down to a 30 foot setback, additional protection for the wells in question mould be pro- vided by requiring that the well casings be grouted down to 11~ times the depth of sewer construction at a point perpendicular to the wello If ADEC can impose monitoring requirements as a condition of approval, we would be agreeable to requiring periodic water quality monitoring for 1 or 2 indicator parameters in those situations that don't fit neatly with the plan above or where even greater protection is required° Our recommendations should not be construed to apply in all similar situations - each must be treated on a case-by--case basis. Our recommendations are con- tingent upon careful and frequent inspection of construction activities, particularly in critical zones of protection. If you have any questions, please call me at 264-4720. Robert W. Robinson Division Manager Environmental Health RR3/dEH1 cc: Bruce Erickson - ADEC MUNk.,IPALITY OF ANC ,ORAGE ASSEMBLY MEMORANDUM No. AIM 175-85 N~eeting Date: August 13, 1985 Mayor NEED FOR PUBLIC WATER IN ZODIAK MANOR SUBDIVISION Certain property owners within the Zodiak Manor Subdivision have indicated an immediate need for public water to serve their households due to failing wells. The property owners reside on the east end of Mars Drive, within the boundary of Zodiak Manor Lateral Improvement District (L.I.D.) 154 which is currently being advertised for construction. The same general area encompassed by the L.I.D. was recently balloted for a Water Improvement District (W.I.D.) which failed by a wide margin (see attached map). The Anchorage Water & Wastewater Utility held a meeting with the affected property owners on Tuesday, August 6, 1985, to address the problem. The property owners were told that a smaller W.I.D., serving only the east end of Mars Drive, could possibly be created in order for them to be served with public water (see attached map). For this to occur, they were told that a letter requesting such service would be required prior to the initiation of any balloting, that a minimum vote of 51 percent in favor and subsequent Assembly approval would be required before a W.I.D. could be created. The property owners are still apparently considering how large a district they want to petition for since a formal request has not been received. The water would have to be brought into the proposed service area, a distance of approximately 3,150 feet, from the Service-Hanshew well at a total cost of $482,000. Money is not currently available for this project. It would be practically impossible, especially if winter arrived in October, to ballot, create an improvement district, design and construct the project this year. If the area is successfully petitioned this fall, there is a high probability the project could be built next summer, depending upon the availability of funding. A large portion of the proposed W.I.D. is Municipality of Anchorage owned property, under the control of Heritage Land Bank, Parks and Recreation and the Anchorage School District. Without Municipal participation, the cost to the affected private property owners could be increased considerably. ASSEMBLY MEMORANDUM Page 2 An alternative to this project, which would not be as expensive to property owners, would be to drill the affected wells to a greater depth at the property owners expense. This would be the most expeditious manner in which to solve this problem. Con ~mith Municipal Manager Prepared by: Jean G. Micho~ General Manager Anchorage Water & Wastewater Utility Respectfully submitted: Mayor Department of Health & Environmentm' Protection Environmental Health Divi on Case Review Worksheet Case Number I Date Received t Comments Due By S-6687 / December 7, 1982 I December 24, 1982 Subdivision or Project Title: Lot 2A, 2B Zodiak Manor Subdivision ( ) Public water available (~"~ommunlty water available (~) Public sewer available Comments DOWL kn Church of Jesus Chris of 5atter D/a3 7901 Honeysuckle Drive Anchorage, Alaska 99503 Attention: Lloyd Owen Su'bject. Percolation Tests fo~..~t~ Christ: of Latter Day Saints, Lots 2A and 2B, Zodiac Manor Subdivisio.n, Section 10, T12N, R3W, S.H., Anchorage, Alaska Dear Mr. Owen: Transmitted herein are the results of our investigation con- ducted for the above referenced project. The field work was conducted on December 31, 1982. The subsurface exploration was conducted using a track mounted Mobile B-50 drill rig fitted with continuous flight, hollow stem auger. The rig is owned and operated by Denali Drilling, Inc. Test borings were located with a cloth tape by Mr. Terry Barber, geologist with Alaska Testlab. Mr. Barber also supervised the drilling, logged the test borings and conducted the percolation tests. Two test borings and two percolation tests were conducted during this investigation. Their locations are shown on Figure 3. The soil logs and percolation tests data are shown on Figures 1 and 2. A ~oring was drilled to a depth of 16 feet at both loca- tions. No groundwater or bedrock was encountered to that depth. A second shallow boring was drilled for the percola- tion tests not more than 10 feet away from each of the deep borings. The shallow borings were' drilled to depths of approximately 6 and 7 feet, and presoaked over night. Perc- olation tests were conducted with no more than 1 foot of water head. The water level was measured from a fixed ref- erence point to the nearest .01 foot at 30 minute inter- valso The tests were conducted for 4 hours and the lowest infiltration recorded for each test was used in the calcula- tion of percolation rates. These rates' are given below. Maurice P. Oswald Kenned~ Il, WMch · Melvin R. Nichols Church of Jes January 7, ].9~ Page Two Christ of Latter Day Sai' 3 Test Borin~ 2A 2B · Percolation Rates 31 minutes/inch 42 minutes/inch Should you have any questions regarding this letter or re- quire further assistance, please do not hesitate to call. Sincerely, A~proved: Melvin R. Nichols, P.E. Partner DOWL ENGINEERS Charles R. wilson Geotechnical Engineer CRW:MRN:kf Attachments ~ ...... .. .............. ..:,..~ ABBOTT LOT 2B LOT 2 A ROAD 12§ KEY · TEST BORINGS · PERCOLATION TEST SCALE: I"= 200' BORINGS -E.... THE` ,CHURCH OF dESUS ,CHRIST OF NGINEERS LATTER DAY SAINTS w.o. ~ 5<:)O48 FIGURE I MUNICIPALITY OF ANCHORAGE DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION SOILS LOG - PERCOLATION TEST PERCOLATION T~$T ! 2 3 4 6- 7- 8- 10- '12 13 14 15 16- 17- 18.- SLOPE 05 tO' :. Nichols No. 4112-E ?~,008 (61~~J) WAS GROUND WATER ENCOUNTERED~ IF YES. AT WHAT DEPTH? Reading Date Time 8',3o I0:30 1~3o SITE PLAN Time Water Drop I~ERCOLATION RATE ~ J (minutes/inch) TeST RUN EETY~EEN __~...~.;-- FT AND -,,~C7 : ET DATE:~-~~ FIGURE 2 MUNICIPALITY OF ANCHORAGE DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION SOILS LOG - PERCOLATION TEST' PERCOt. ATION TEST $ 6 7 8 9- 10- 11- ' 12 13 14 15 17- 18- WAS GROUND WATER ~/Q ENCOUNTERED~ O IF YES, AT WHAT DEPTH? u P I Gross Net I Depth to Net Reading Date Time Time Water Drop ,. ~57-~.3~ ,~ Z " ~:~ _ ~ -- ,, -~o:~ ,, ~..5.~ ,o3 7" ,, /1:~ .~ ~G[ .~ ~ ,. /z:~c __ ,, ~.~ .o~ .... ~ ., i~::~ ,, ~.7~ .0~ tERCOLATION RATE ~ *'4~' (ml.ute, lir~:h] TEST RUN BETWEEN Z~,~ FT AND ~"~'~ FT C~nT,n~oev: ~ __DATE:_/ ! FIGURE 3 Test Hole Log - Description Guide The ~oLI descriptions shown on the k, gs ate the best estimate of the l~'ecition of a labor=coty testmg procedure. H' iht log includes soils to ~etify the field examination. The logs often include the Following items: ~___.~th Interval - usually shown to 0.1 foot, within that zone no si&ni~cant change in soil type was observed throu&h drill action, du'ect observation or sampling. Frost Classification - NFS, FI, F2, ~, F4, ~e "So~ C~ssification Text~c uf Soil - An engineerin~ classification of the soils by p~rticle LW, NP. M% or dila~ency,) iht c]ay-sd[ groups. DcrWed from drill ~ction ~nd/or sample da~. P~ticle size - The lar~es~ partic}e recovered by the split spoon {-3~8", Shelby lube 3", auger ~igh~s (minute-man) 3", A~ci (~S0 hol]ow stem) 6"-8'. Larger part{cle~ are described ind~ect{y by Iht description ol~ the ho]e log mus[ be considered for an'indication h~er ~r ticJe~. Unified So~ C]assificaoan ~ This is ~ two letter code. See ~ssi~ca~ion sheet lot ~ther deFmitton. In some cases AASHO and/or FAA soil cZa~i~cations may be shown as well as the unifie~. Atterber~ Limits - u~ful for fine 8rained and othtr p~stic ~, p~; ~tmai moisture content believed to be less than p~astic ~mi¢ P~; nat~al taoistic content believed to be between p~stic and ~qud ~mi~s L~; naturll moistme content behe~d to bt ire*~er than l~uid limi~ ~a~ed or nearly i~t~a~ed ~od sample when vibrated or johed - Rock flour - finely ground soil that is not plasdc but ochenvise ,ppears ~mila/to~ clayey silt. Organic Content - usuaUy described as Peat, PT1 sometimes includes ~y occ~ing below a peat deposit. ~ -- organic plrticles near[)' or fully disinter=ted. Frost Line - ~a~nal frost depth asde~ribed by dr~li~ action =,id/or ~cludes description of icc content, often will include modil~cd Unifi*cd Blow/6' - The number of blow~ of a 140 we~ht free filling 30" ~, reichs to 2" spht spoon driven into the soilby 140 pound 'we~ht, · duturbed ~, thin wall tubes "Shelby" u~d to obta~ unduturbe~ samples ~( fine ~ained ~, "~b" d~turbed ~mp~e from a~er ~hts or wall of trench, ~ cu~ ~mple, undist~bcd slmpic ~rom wall of trcnch. [~y Stte~th - a useful indicator of a soil's c~yey ~raction, N:None, ~=Lo~, M =Medium, H=H~h ~ - The ~mptes ~re placed into apparently simd~ groups TEXTURAL SOIL CLASSIFICA'FION CHART G~AVEL 30% CLAY / SILT'I SAND CLAYE {:~AYE¥ ,;LAYE'~ · OR OR SILT' O GRAVEL 0 I0 GRAVELLY SAND GRAVEL \ 20 30 40 50 6(:) 70 80 90 GRAVEL (+ :it 4 SCREEN) % BY WEI(~HT FROST CLASSIFICATION SYSTEM NONFROST SUSCEPTIBLE SOIL5 ARE INORGANIC SOIL5 CONTAINING LES5 THAN 3% FINER THAN 0.02 mm, GROUP5 OF FROST-SUSCEPTIBLE SOILS: F! GRAVELLY SOILS CONTAINING BETWEEN 3 AND 20% FINER THAN 0.02 mFn. F2 SANDY SOLES CONTAINING BETWEEN 3 AND ].5% FINER THAN 0.02 mm. F3 a, GRAVELLY SOILS CONTAINING MORE THAN 20% FINER THAN 0.02 mm. AND SANDY SOILS (EXCEPT FINE SILTY, SANDS) CONTAINING MORE THAN 15% FINER THAN 0.02 mm. b, CLAYS WITH PLASTICITY INDEXES OF MORE THAN ].2, EXCEPT VARVED CLAYS, F4 a. ALL SILTS INCLUDING SANOY SILTS. b. FINE SILTY SANDS CONTAINING MORE THAN 15% FINER THAN 0.02 mm, c. LEAN CLAYS WITH PLASTICFI'Y INDEXES OF LESS THAN 12. d. VARVED CLAYS. CHEMICAL e GEOLOGIC, AL L_ABORATO_I~ OF _ALAaKA,,NC=. D,inkiilg Water Ana!ysis Repor~ for Total Coliform Bacteria 1'O BE COMPLEI'ED BY WATER SUPPLIEFI PUBLIC WATER SYSTEM: ID, NO. PubSc Water System Nqme' Msllln. Addre,, City 5A~I3LE DATE: ~ Mo. Day Year SAMPLE TYPE: [] Routine [] Check Sample (for routine sample with lab ref. no. [] Special Purpose State Zip Code ) [] Treated Water E} Untreated Water SAMPLE NO. ~) LOCATION Time Collected Collected By TELEPHONE (907) 279-4014 TO RE COMPLETED BY LABORATORY LABORATORY: NAME ADDRESS CITY Reoe,ved '-' Time Received__,,,'/~'~L)~ Analytical Method: [] Fermentation Tube Membrane Filter Lab Ref. No. Result* Analyst J ~ L J J E~ READ INSTRUCTIONS BEFORE COLLECTING SAMPLE Forrn No. 18.310 (3.78) 06-1220 (b) Rev, lB78 BACTERIOLOGICAL WATER ANALYSIS RECORD Time Received-- p.m. Lab. NO.- MUNICIPALI'FY OF ANCHORAG- DEPAR'FML,,F OF HEALTH AND ENVIRONMEN ,,- 825 L Street, Anchorage, Alaska 264-4720 PROTECTION 99501 Date Received: January 11, 1978 :Il: Time ~N :30 a.m. Time It3: Time Date ]_-13-78 REQUEST Friday Date Date Insp Insp FOR APPROVAL OF INDIVIDUAL SEWER AND WATER FACILITIES o Lending Institution Request: First National Bank of Anchorage % Marie Mailing Address: Post Office Box 720 99510 Phone: 276-6300/483 Property Owner: Kenneth G./Barbara E. Martin Mailing Address: 8621 Jupiter Drive 99502 Phone: 274-4620 3. Legal Description: 4: Single Family Residence: ~) Multiple Famlly Residence: ( ) Lot 20 Block 6 Eodiak Manor Subdivzszon 862T gupmter-Drzve Number of Bedrooms: Four Number of Bedrooms: 5. Well System: Individual well (x$ Con~nunity/Public System Permit t~ Depth of Well 124' Well Log on Construction Bacterial Analysis ) File (x) Iiams Sewage Disposal System: On-site System ( ) Public Permit II Installed Installer Septic Tank Size Manufacturer Absorption Area ~oils Rate Material utility 7. Distances: Well to Septic Tank to Absorption Area to Sewer Line Nearest Lot line Absorption Area to Neares~ Lot Lzne Page Two Department of Health and Environmental Protection Reques~ for Approval of ]individual Sewer and Water Facilities Legal Descr±ption: Lot 20 Block 6 Zodiak Manor Subdivision Comments: Affadavit Attached,~i__~ :-~ ) Letter Attached: ( ) Approved: Disapproved: Date: Department Worksheet: 06.1220(a) Rev. 1973 DATE ALA,..,~, DEPARTMENT OF HEALTH AN[) SOCIAL SL ,CES DIVISION OF PUOLIC HEALTH iNDiVIDUAL AND SEMI.PUBLIC BACTERIOLOGICAL WATER ANALYSIS Lab No. OFFICE iNDiVIDUAL [] NAME SEMi,PUBLIC [] CHLORINE RESIDUAL PPM REPORT RESULTS TO ADDRESS CiTY ZIP CODE ADDRESS OF SOURCE AnaJysJs shows fi~is Water SAMPLE to I~e: ~] Satisfactory [] Questionable SANITARIAN'S REMARKS COMPLETE THIS SECTION ONLY IF WATER IS AN INDIVIDUAL SUPPLY ir SAMPLE COLLECTED BY ...... [)ATE COLLECTED TIME COLLECTED Top -- ~] Wood [] Concrete U []]Open Top[] Concrete [] Under House [] Wood J-] Tile [] Fibre [] Asbestos [] Yes [] No READ INSTRUCTIONS 06-1220 (b) ~ev. 1973 Date Received REVERSE SIDE 48 Hours BEFORE COLLECTING SAMPLE EMB BACTERIOLOGICAL WATER ANALYSIS RECORD / /'/ ~'/'/(' __ Time Received. .l~m L'ab. No. -- [,Ili!,JICli~ALI1 Y OF AN.t;!IOP, AGE DEPAR1MENI' OF HEAl 111 /,HD EHVIii()>~MENTi~L PRO [ECl ION ' 279-'25] )., c:-;h. 224, 225 REOUEST FOR APPROVAl. OF INDIVIDUAL SEWER and WA~I:R FACII_ITIE8 1-ypc bi Inspection: VA _FItA. . Name of Buyer: ~m,~ I~ -- Mailing Address: Day Phone: Name of Lending Institution:.l '~lZ~t~ Na,ne ol Realtor or Agent:_ ~/f~ Mailing Address: ........ Phone: ..... Water Supply Type of Supply: Public Utility _ _ .Indvidual_~' ...... If Individual, number of dwellings presently served ...... Iflndividual, depih of well- -- - l-;%,¢-t Sewage. Disposal System Type of System: Public Utility lk__/-- ..... Individual (on-site) If Individual, date of installation ..................... 72 003(3176) CONSULTING ENGINEER 03 W ~51h AVE "C" SUITE 203 ANCHORAGE, ALASKA 99501 TELEPHONE (907) 279 39t6 STEVE ENG DISTRICT ENGINEER .... ~ E wESTERN DISTRICT OFFICE ANc~u~G / ' DEPARTMENT OF ENVIRONMENTAL CONSERVATION 437 'E" STREET, sUITE 303 ANCHORAGE, ALASKA 99501 AUGUST 21, 1985 SUBJECT: TEMPORARY WAIVER HORIZONTAL sEPARATION BETWEEN WELL AND SEWER LINE, LOT 20. BLOCK 6, ZODIAK MANOR GENTLEMEN. The existing well on this property has been replaced with a well meeting the separation distances of the State Code. The existing well has been abandoned in accordance with State regulations. The conditions for the waiver granted on April 9, 1985 no longer exist. The request for waiver is therefore withdrawn. 30' CERTIFICATE OF SURVEY HERESY CERTIFY THAT I HAVE SURVEYED THE FOLLOWING OESCRIBED PROPERTY: A8 RECORDED IN THE ANCHORAGE RECORDING PRECINCT, ALASKA,AND THAT THE IMPROVEMENTS SITUATED THEREON ARE LOCATED AS SHOWN ON THtS PLAT~, AND THAT THERE ARE NO ROADWAYS, TRANSMI8810N LINES OR OTHER VISIBLE EASEMENTS ON SAtD PROPERTY EXCE;PT P'V'C)T PLA ~URV EY TITLE SC^LE: ~ DRAWN BY: b'~-- C~'IECKEC AS INDIOATEO HEREON. CONSULTING ENGINEERS . SURVEYOR8 ~03 W. 15TH AVE. ANCHORAGE~ALASKA 99501 12 151 <~> 12 Y 158 Hidden Lake Area Reference Map-P12