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HomeMy WebLinkAboutSPENARD HEIGHTS ADDITION LT 6,nard H ights Addn Lot 6 #012-052-36 G 3LitA woo/ p Inc 0010{6. tide, w • vn9n1 1'1 inlet • Ju)4.4e9i119 05\j 111O$11 August 30, 2017 Onsite Reviewer Municipality of Anchorage On-site Water & Wastewater Program 4700 Elmore Road Anchorage, Alaska 99519-6650 Re: Lot 6 Spenard Heights Subd; Parcel #01205236000 3729 W 61St Ave, Anchorage, AK 99502 Separation distance Waiver request Background: The owner of the subject property (single family home) is requesting a waiver for a separation distance from a private water well established in November of 2016. Well was shifted per Owner request to allow well drilling rig improved access to the site area. The presence of a 2nd cleanout was not detected during installation in early winter conditions. The existing sewer service for Lot 3 was field located during the sewer pipe condition check and our LCG Lantech survey crew surveyed the field locates on 8/23/17. The sewer extends around the carport to the west side of the house and connects into W. 61st Avenue as shown per the attached site plan map. A 25' setback buffer radius is shown around the existing well in the site plan. Subject property existing well to: a. Existing sewer cleanout/private sewer line: 11'-4" (11.3 feet) Justification: 1. The well casing was seal grouted by well driller from the surface down to 20' bgs with bentonite. Casing protrudes approximately 30" above ground surface and has a sanitary seal. 2. All existing cast iron pipe within the 25' well setback buffer will be replaced with 4" DR18 PVC C900 pipe with restrained joint integral bell (RJIB) gasketed joints conforming to AWWA C900. The existing cleanout riser pipe located within the setback buffer shall be field-verified for pipe material type and if cast iron pipe shall be replaced with restrained Certa-Lok C900 RJ pvc pipe if riser is not already RJ pvc pipe. Contractor shall verify where existing sewer service on Lot 6 changes to pvc plastic pipe. Depending on where the existing plastic pipe begins, the cleanout shall be shifted, to the extent possible, to increase setback distance from the well. Joint connections of the existing pvc pipe within, or in close proximity to, the setback buffer shall be checked for leaks and joint integrity. If necessary, encase existing pvc pipe joints with bentonite to fully seal joint connection. 250 H Street,Anchorage,Alaska 99501 I Main Line: (907) 243-8985 I Fax: (907) 243-5629 I www.lcgak.com Onsite Reviewer, MOA Water & Wastewater Program August 30, 2017 Lot 6 Spenard Heights Addition Page 2 of 2 3. The water service from the new well will be routed around to the east side of the house with 12 to 15' separation and will not cross the existing sewer. Contractor shall re-seal the well casing after the pitless and house service tie-in is installed. 4. Surface pollution. Site slopes away from the house to the north and to the west. Beyond the edge of the grassed area, is undeveloped terrrain (wooded) that slopes to the northwest. Well location is north of the cleanout per site plan. Overflow around the cleanout would drain primarily to the west and be visible to be addressed before it could accumulate enough to move toward the well. The well casing was seal grouted from the surface to 20' bgs with bentonite. 5. Subsurface pollution: Well depth is 280 feet with a static water level of 85 feet, which equates to a pressure of 84 psi [(280 ft - 85 ft) x 0.43 psi/ft = 83.9 psi]. The relative pressure at this location indicates the aquifer is well-confined and unlikely to be influenced from the subject property above. 6. See attached site analysis calculation (14.0 points) using ADEC waiver criteria. Per ADEC waiver guidelines for values between 12 and 16, no bacteriological pollution is possible, however chemical pollution from household chemicals is considered possible but unlikely. 7. Other: The population density is relatively low in this subdivision (-5000-7500 SF per bedroom). No other wells in the area would be affected by the location of this waiver request. The well driller submitted a well water sample for testing and is awaiting the results. The testing results of this sample will be submitted along with this request for waiver. If you have any questions please call me at (907) 245-8884. Thank you. cerely, D vid Coolidge, PE Senior Civil Engineer, LCG Lantech LLC Enc. Well log, waiver site plan and site analysis reference data 4114"' OF 40 % :r, •....... . `' ••. 0 1' •9�t : t Ili .%. IA- D.YID R. COOLIDGE. Ncr.‘.el.,C0.8st:10;..3E.580.:::.‘11;;:k.;.\;14...treco-toio• ------- --- -- ----- --- ------------- 100' 100' SEWER /SETBACK LOT 3 .77 ,-100'PROPOSED IFS % WELL BUFFER LOT 4 N89° 59' 27"E 116.25 / 1 / 75 SEWER MAIN,, \ SETBACK LOT 5 / LOT 6 / 25'SEWER g SETBACK 8 Lo I o g1 ' EXISTING e7.996 1 -EXISTING WELL WELL SEWER SERVICE wj - 5.7% •co � 1 V 1J' I , 75 SEWER MAIN p ../ co j SETBACK 'ter//////// O EXISTING o z HOUSE "'I 1 A 1 25 SEWER SETBACK I - SEWER 100'SEWER ` SERVICE i �;, 100' SEWER / SETBACK SETBACK / 'S89' 59' 27"W 116.25; W. 61ST AVE N. W. 61ST AVE (m—i-) -LEGEND: ~ —.- 1 O -WELL e -SEWER MANHOLE euA.w.r.bear. ocn •CLEANOUT LOT 11 ----PROPOSED WELL BUFFER ———-LOT EASEMENT LINE GAS AND OTHER UTILITY LOCATIONS ARE APPROXIMATE. SEWER LINE SETBACK CALL 811 FOR LOCATES PRIOR TO DRILLING. I -SEWER LINE SEPERATION DISTANCES AND SETBACKS PER -UNDERGROUND GAS LINE AMC 15.55.060 TO BE VERIFIED BY DRILLER '' L( 'G: SPENARD HEIGHTS SUBDIVISION DRAWN BY: PS CHECKED BY: SC �r�f-Jr�rtr Inc LOT 6 DATE: 08/24/2017 auititectwte•enyoiee161•ou:weytit¢ JOB NO: 15064 •--•--• WELL SITE PLAN I SHFFTNC) P`907243-8983 PARCEL# 01205236000 SCALE: 002 Fw )243-5629 ww., 1"..40' cyak.com General Lot 6 Spenard Hts; Parcel #01205236000; Well permit OSP161216; Owner: Margaret Johnson ADEC site evaluation criteria for waiver request: Water Table Point Value Cased depth to water bearing layer 278 Depth of existing sewer service pipe 5 7.53 Soil Sorption soil descriptions per attached well log from Hefty Drilling DEC points Depth fron Depth To Thickness Calc'd points Casing stick up n/a 0 2 n/a Organic top soil 0 2 4 2 0 Silt and Gravel 3 4 35 31 0.33 Clay 6 35 140 105 2.25 Sandy Clay 4.5 140 230 90 1.45 moist gravel w/clay 2 230 269 39 0.28 coarse gravel w/water 0 269 280 11 0 278 4.31 l 4.311 Permeability soil descriptions per attached well log from Hefty Drilling DEC points Depth fron Depth To Thickness Calc'd points Casing stick up n/a 0 2 n/a Organic top soil 0 2 4 2 0 Silt and Gravel 1.5 4 35 31 0.17 Clay w/some silt 0.8 35 140 105 0.3 Sandy Clay 2 140 230 90 0.64 moist gravel w/clay 1.7 230 269 39 0.24 coarse gravel w/water 0 269 280 11 0 278 1.35 I 1.351 Water Table Gradient assume gradient slopes toward the water source assume -25% slope (conservative estimate) 0.5 Horizontal Separation 11-5" (11.42') 0.32 Total Points 14.01 Per ADEC waiver guidelines, the sum of the area conditions reviewed equate to a point value of 14.0. For values between 12 and 16, no bacterological pollution possible. Chemical pollution from household chemicals may be possible, but unlikely. On-Site Water System Permit MUNICIPALITY OF ANCHORAGE Development Services Department On-Site Water & Wastewater Program 4700 EImore Road, PO Box 196650 Anchorage, AK 99519-6650 Telephone: (907) 343-7904 Permit Number: OSP161216 Tax Code Number: 01205236000 Work Type: Well Initial Permit Effective Dates: August 27, 2016 Design Engineer: to August27,2017 Subdivision: SPENARD HEIGHTS ADDTION Site Legal Address: SPENARD HEIGHTSADDTION LT 6 G:2026 Owner/Address: JOHNSON MARGARET L TRUST JOHNSON MARGARET LORRAINE/TTE 3729 W 61ST AVE ANCHORAGE AK 995022002 Site Mailing Address: 3729 W 61ST AVE, Anchorage Lot Size in Sq Ft: 17438 Total Bedrooms: 4 }artment This permit is for the construction of: N Disposal Field N SepticTank N Holding Tank N Privy Y Private Well N Water Storage All construction must be in accordance with: 1. The attached approved design. 2. All requirements specified in Anchorage Municipal code Chapters 15.55 and 15.65 and the State of Alaska Wastewater Disposal Regulations (18AAC72) and Drinking Water Regulations (18AAC80). 3. The wastewater code requires inspections during the installation. The engineer must notify the Development Services Department at least 2 hours prior to each inspection. Provide notification by calling (907) 343-7904 (24 hours). 4. From October 15 to April 15, a subsurface soil absorption system under construction during freezing weather must either: A. Open and Close on the same day. B. Covered, sealed, and heated to prevent freezing. MUNICIPALITY OF ANCHORAGE Community Development Department ~.~ Phone: 907-343-7904 Deveropment Services Division ~ Fax: 907-343-7997 On-Site Water & Wastewater Program ON-SITE SEWER/WELL PERMIT APPLICATION Propertyowner(s) ~'~::A'(~-__~ t~'¥_..~ j_. '~'l ~ Mailing address ~ ~ ~[ ~' ~ ~~ Site address ~ ~ ~ [ ~[~ ~'~ Legal descnphon (Sub d., Block & Lot) ~ ~th~ ~ ~[~ ~ Legal description (Township, Range & Section) Lot Size Sq. Ft, Number of Bedrooms APPLICATION IS FOR: APPLICATION IS AN: TYPE OF DWELLING: ([] all that apply) Absorption Field [] Initial [] Single Family (SF) (w/we ADU) Septic Tank [] Upgrade [] Duplex (D) Holding Tank [] Renewal [] Multiple Dwellings Privy [] (SF and/or D) Private Well ~ Water Storage [] ~214. ~r~or THIS APPLICATION INCLUDES A VARIANCE I WAIVER REQUEST FOR: Distance: I certify that the above information is correct. I further certify that this is in accordance with applicable Municipal Codes. (Sign~..~o'~)roperty o~'or huthorized agent) Permit/Rush Fees: ~'~(J~, ~ Waiver Fees: Date of Payment: oC'~/'-'/~ Date of Payment: Receipt Number: Receipt Number: Permit No.05'i i4/g/ Waiver No. 7 ' //~~ LOT 3 -- t /~' __ ./ / ///~ x - , LOT 4 / / %. / ~00'PROPOSED ~ / WELL BUFFER ] / //./ / N89059'27"E 116.25 ~. / / / / SETBACK t. ~ ~ ~~-/.~1~ , LOT 5 /g' / ...... ~.... .~~ LOT 6 /% I ~/ / / / SETBACK / ~ / / 0 SITE LOCATION 0 / / / / / 0 / / / / ~ ~ / ~ ~//////~ HOUSE ' 7 , , ~ S89° 59' 27"W 116.25 / ~EGEND: ~ 'X .~ ~ - PROPOSED WELL ~ ~- SEWER MANHOLE ~ ~ _ ~OSS,B~ w~:: :OC*~,ON LOT 11 ~ .... PROPOSED WELL BUFFER ~ ~ .... LOT EASEMENT LINE G~ ~ND OTHER UTILI~ LO~TIONS ARE APPROXIMATE. SS - SEWER LINE S~BACK CALL 811 FOR LOCATES PRIOR TO DRILLING. - S --SEWER UNE ~ SEPE~TION DI~ANCESAND SETBACKS PER ~ SS .... SS -~,~ - UNDERGROUND GAS LINE- AMC 15.55.0~ TO BE VERIFIED BY DRILLER ~ ~~ SPENARD HEIGHTS SUBDIVISION ~w..,: . ~~ ~ LOT 6 ~: ~' ~-~ JOB NO: ~"~- WELL SITE P~N ~,,~,~.,~,,~.~ PARCEL~ 01205236000 002 iS +yj Y F [d J lT %1 } k t 3 + r 1 m M � 5 t W m 1 IN S 0 ca r 4 m F L i I�YF } 1410 k * s5 } �14 } { t + r 5 t m I I m I - I i m L ffffiff- z 0 • r N AN I� i , r c it t i F 0 m 0. dw la zi MI i Ln l m 1*0 R m 70 .- 5i 0 (-)o az ;u 0 (n Z �KIIF 0 i �+F 0 U m o t 0 z 0 • r N AN I� i , r c it t i F 0 m 0. dw la zi MI i Ln l m 1*0 R m 70 .- 5i 0 (-)o az ;u 0 (n Z �KIIF 0 i �+F 0 U m t 1 3 Ir a p did&— f t � r I A • 4I. I 41 414 S 4 f` �yy a 1 Y Y µ ,+� ,yam r-777-47;..ice ad Ka +L. -h.+ti r.w .wrr r �a_ ,.. _wLV ti ..� Jr J. .dlaYC r�r F #tt'+.L�.J' _ �� .f+�.i . 't sl �S4 Y� ..r 4,t +{.t'f_ k '.' _��'3 ��# i }_ v 1 stiff r .i.� "'t *s � #. .•�#fig++ �. *.# ~t_ 3_ f wr .. 1 7177777 i r77tYf $ '/ 6 U -'° aatx eolt N. LU TI—L— i 19, N " s (HO HO -Ino) '3AV'Plg9'M r --- 11 w��w a 3 '1D 3NNtl ALIVW m p ti F �s '00 � 1 x w I i gay` Q, 3 mt o � z 1� Q' O O J ""_ -fir m d W 4 T d C C LU TI—L— i 19, N " s (HO HO -Ino) '3AV'Plg9'M r --- 11 w��w a 3 '1D 3NNtl ALIVW ti F f ( �V I Vit;,.. (l i ti F r I i S N X I X X O O O x LI IJWELL Ul x � DECK WITH CARPORT BELOW x 30.6' I SEWER PIPE X I X I X C4 0 C i I I REMAINDER Lot 3 I EAST 116.25' I Lot 6 °ram° 17,438 s.f. REMAINDER Lot 4 CHAIN -LINK FENCE OO O C.A fTl o Lot 5 11.8' 53.7' 1 STORY DUPLEX o RESIDENCE WITH WALKOUT � �j BASEMENT N 41.7' 15.9' 12.0' A 1.3' CANT ASPHALT . PAVEMENT 1 16.25' W. 61 st AVENUE --------------- I FENCE PLOT PLAN ___ AS BUILT _X_ SCALE 1_=_ 30__ GRID SW 2026 _ Project No. ___ J24=096�1 P.O. Box 210005 Lang & Associates, i n C Anchorage, Alaska 99521-0005 ooOpO (907) 522-6476 ao D�Q Professional Land Surveyors ken®langsurvey.com o 0 • A, Op jonathan®longsurvey.com I hereby certify that I have surveyed the following described property: LOT 6, SPENARD HEIGHTS ADDITION (Plat No. P-117) Anchorage Recording District, Alaska, and that the improvements situated thereon are within the property lines and do not encroach onto the property adjacent thereto, that no improvements on the property lying adjacent thereto encroach on the surveyed premises and that there are no roadways, transmission lines or other visible easements on said property except as indicated hereon. Dated this the - 6-L �T Day of _ ______, - at Anchorage, Alaska It is the responsibility of the owner to determine the existence of any easements, covenants, or restrictions which do not appear on the recorded subdivision plat. .... ................. JO AN C. LANG o s LS-9944.••' SJ_p OQROFfSSIONAI- �Qc State of Alaska AECC963 MUNICIPALITY OF ANCHORAGE Development Services Department Phone: 907-343-7904 On -Site Water & Wastewater Section �' Fax: 907-343-7997 Parcel I.D. 012-052-36 Certificate of On -Site Systems Approval Expiration Date: O�— Legal description SPENARD HEIGHTS ADDITION LT 6 Site address 3729 W 61 ST AVE Anchorage AK Current property owner(s) MARGARET JOHNSON X The On -site system(s) is/are approved for 4 bedrooms Conditional approval for bedrooms, with the following stipulations: Comments or advisories: A s Original Certificate Date: This Certificate of On -Site Systems Approval (COSA) is intended to demonstrate the subject system(s) is/are in substantial compliance with municipal code. The Municipality of Anchorage, Development Services Department (DSD) issues COSAs based upon representations provided by an independent professional engineer. The Municipality of Anchorage is not responsible for errors or omissions in the professional engineer's work. ATTACHMENTS: COSA Checklist X Well Flow Advisory Absorption Field Advisory Nitrate Advisory Tank Age Advisory Arsenic Advisory X Other COSA ApprovaIjune 2022 MUNICIPALITY OF ANCHORAGE Development Services Department Phone: 907-343-7904 On -Site Water & Wastewater Section '� Fax: 907-343-7997 Certificate of On -Site Systems Approval Application 1. GENERAL INFORMATION Parcel I.D. 012-052-36 Complete legal description Spenard Heights Addition Lot 6 Location (site address) 3729 W 61 st Avenue Current property owner(s) Margaret Johnson Trust Day phone (907)360-0386 2. ON -SITE SYSTEMS SIZED FOR BEDROOMS 3. TYPE OF WATER SUPPLY: ❑ Private Well ❑N Private Well serving 2 dwelling units ❑ Private Well serving 3+ dwelling units ❑ Community Well or Public ❑ Water Storage 4. TYPE OF WASTEWATER DISPOSAL: ❑ Private Septic ❑ Private Septic serving 2 dwelling units ❑ Holding Tank Community Septic or Public Sewer 5. SEPTIC TANK: ❑ Steel ❑ Plastic ❑ Concrete ❑ Fiberglass Age - See advisory if steel older than 20 years 6. ABSORPTION FIELD: ❑ AWWTS ❑ Bed ❑ Deep Trench ❑ Wide Trench ❑ Seepage Pit Waiver request for: Expedited review requested: ❑ Distance: By applying for this entitlement, this property is subject to inspection by municipal On -site staff to verify the accuracy of the information provided. COSA Fee $ ZOO Date of Payment 75�Z y COSA # C�SG Zy 12 3 Waiver Fee $ Date of Payment Waiver # COSA Application —June 2022 MUNICIPALITY ANCHORAGE DEVELOPMENT SERVICES DE TENT '�� 907-343-79€J4 On -Site Water and Wastewater Section Fax: 343-7997 www.muni.arg/onsite Arsenic Advisory Certificate of On -Site Systems Approval # OSC241239 Subdivision: SPENARD HEIGHTS ADDITION, Block: , Lot: 6 A water sample revealed an arsenic concentration of 11.2 micrograms per liter (ug/L). The Environmental Protection Agency (EPA) has established a maximum contaminant level (MCL) of 10.0 ug/L for public drinking water systems. While private wells are not subject to this regulation, EPA standards are based on existing health information and can therefore be used to gauge the relative quality of water from private wells. information on arsenic is available from the On -Site Water and Wastewater Program website (www.muni.org/onsite) or at 343-7904. This advisory must be attached to all copies of the subject Certificate of On -Site Systems Approval. COSA Checklist Legal Description: Spenard Heights Addition Lot 6 Parcel ID: 012-052-36 If more than 1 well and/or septic system on lot, provide separate checklist. Structure served by this system _ A. WELL DATA ❑R Well log is filed with Onsite (or attached) Date drilled 10/27/16 Total depth 280 ft Cased to 280 ft 0 Sanitary seal is functioning correctly © Wires are properly protected Casing height (above ground) +18 in. Date of flow test for COSA 6/24/2024 Static water level at beginning of test 77 ft. Comments B. TANK DATA Meas,ured operating fluid level in septic tank Date of pumpin, ❑ Required maintenance com if AWWTS Comments: D. ABSORPTION FIELD DATA ich system tested (date installed) ❑ A standpipes present per record drawing Total me ured depth from grade ft (max) Measured de h to pipe invert from grade ft (min) ❑ N/A —pre urized field. ❑ Per record dr ings, field is insulated. ❑ Monitor tubes go to b tom of effective. If not, state depth into ❑ Presoaked required if (Required if house vacant or fiel of used for more than 30 days prior to date of test) Gallons introduced N/A gallons N date Any rejuvenation treatment (past 12 months) A If yes, enter date Comments/Deficiencies: Well production at time of test 5.4 gpm Water storage tank volume None gallons Well disinfected for coliform test? ❑ Yes n No n Coliform bacteria is Negative Nitrate mg/L X Nitrate less than MRL (ND) Arsenic 11.2 ug/L ❑ Arsenic less than MRL (ND) Collected by Forge Engineering Date 6/19/24 C. LIFT STATION u Rec} irtt ed maintenance completed Age of lift station �-._years Lift station material Comments: dequacy test date esuits Q Pass Flu\en prior to test in Wad gal Nep in Elae min Finepth inAbrate > gFIETUS — POST RE VERNEepth (per record draw s Effective depth used in Effective depth remaining in COSA Checklist June 2022 E. SEPARATION DISTANCES From Private Well on Lot to: (Please enter distances if less than required or if community well on lot) Septic Tank/Lift Station on Lot > 100' Community Sewer Manhole/Cleanout > 100' ❑i Yes if No ft FE-1 Yes if No ft Neighboring Tank > 100' M Yes if No ft Private Sewer/Septic Line > 25' ❑ Yes if No 10 1* ft Absorption Field on Lot > 100' M Yes if No ft Holding Tank > 100' R Yes if No ft Neighboring Absorption Fields > 100' Animal Containment > 50' n Yes if No ft ❑o Yes if No ft Manure/Animal Excreta Storage > 100' Community Sewer Main > 75' QE Yes if No ft Q Yes if No ❑ N/A — Served by Community Well (not on lot) or Public Water From Septic/Holding Tank and Absorption Field(s) on Lot to: (Please enter distances if less than required) ations > 10' ❑ Yes if No Tank to Property Line > 5' Field to Property Line > 10' ❑ Yes Water Main > 10' ❑ Yes Water Service Line > 10' ❑ Yes F. ENGINEER'S COMMENTS *Waiver OSV171084 if No if No if No ft Surface Water > 100' ❑ Yes if No ft Wells on Adjacent Lots: --, Private Wells > 100' ❑ Yes if No ft Community We1T—240' _._ ❑ Yes if No if No ft If tank or field is under driveway comment ft ft ft ft G. CERTIFICATION & STATEMENT OF INSPECTION BY ENGINEER As certified by my seal affixed hereto and as of the validation date shown below, I verify that my investigation, based on procedures outlined in the Certificate of On -Site Systems Approval Guidelines, indicates that the on -site water supply and/or wastewater disposal system appears to comply with applicable Municipal and State codes, ordinances, and regulations in effect at the time of installation, unless noted otherwise. Name of Firm Forge Engineering Engineer's Printed Name Benjamin Schiller, P.E. COSA Checklist —June 2022 Phone (907) 522-7773 Date 6/26/2024 Ito (% Benjarr n tchiller �tj9�.•, CE 12592 \c�a% T �f'sl . . •vim •� ��l�l PROFESSIOH��.,^