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Home My WebLink AboutT12N R3W SEC 25 S2SE4NE4SE4NW4Permit Number: Tax Code Number: Work Type: Permit Effective Dates: Design Engineer: Subdivision: Site Legal Address: Owner/Address: On-Site Water & Wastewater System Permit OSPl11173 01701309000 WellSeptic August 01,2011 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 Initial to July 31, 2012 FLATTOP TECHNICAL SERVICES T12N R3W SEC 25 T12N R3W SEC 25 S2SE4NE4SE4NW4 G:2840 CASSITY GLEN KEVIN PO BOX 90354 ANCHORAGE AK 995090354 Site Mailing Address: 12940 MICHAEL RD, Anchorage Lot Size in Sq Ft: 54450 Total Bedrooms: 3 This permit is for the construction of: Y Disposal Field Y Septic Tank 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. Date: Date: MUNICIPALITY OF ANCHORAGE Community Development Department Development Services Division On-Site Water & Wastewater Program Mayor Dan Sullivan Phone: 907-343-7904 Fax: 907-343-7997 ON-SITE SEWER/WELL PERMIT APPLICATION FOR A SINGLE FAMILY DWELLING Parcel I.D. d~ t 7 Property owner(s) Mailing address Site address Day phone Legal description (Sub'd., Block & Lot) .5 '2., _~ /.E '¢, N Legal description (Township, Range & Section) -T' 12. I',/) ~'~ Lot Size Sq. Ft. Number of Bedrooms THIS APPLICATION IS FOR: (1~ all that apply) Absorption Field Septic Tank Holding Tank Privy Private Well Water Storage THIS APPLICATION IS AN: Initial [~ Upgrade [] Renewal [] THIS APPLICATION INCLUDES A VARIANCE / WAIVER REQUEST FOR: I certify that the above information is correct. I further certify that this application is being made for a Single Family Dwelling and is in accordance with applicable Municipal Codes. (Signature of property owner or authorized agent) Permit/Rush Fees: Date of Payment: Receipt Number: Permit No. ~%~ Waiver Fees: Date of Payment: Receipt Number: Waiver No. G:\Building\On Site\Forms\Client Forms\Permit App_010411 .doc (Rev. 1/11 ) FLATTOP TECHNICAL SERVICES CIVIL & ENVIRONMENTAL ENGINEERING * ENERGY CONSERVATION & ANALYSIS TED MOORE, P.E. PH./FAX: (907)345-1355 E-Mail: tgmoore~gci.net July 24, 2011 14530 ECHO CANYON ROAD ANCHORAGE, AK 99516 M.O.A. DSD P.O. Box 19-6650 Anchorage, AK 99519 Dear Sirs: The purpose of this letter is to provide the required design narrative in support of our application for a permit to install water supply and wastewater disposal facilities to serve a planned 3-bedroom residence on S2, SE4, NE4, SE4, NW4, of Section 25, T12N, R3W, located at 12940 Michael Road. A site plan, soils logs, design drawings and specifications and soils log are enclosed for your review. Development of this property is complicated by the presence of an intermittent stream that traverses roughly across the middle of the lot, leaving only limited areas that are greater than 100 feet from surface water. To assess the feasibility of constructing wastewater disposal facilities on this property we dug 3 test holes in May of 2009 at the locations shown on the site plan, and monitored groundwater levels in each throughout the spring, summer and fall seasons. Test hole #2 proved to have the most optimum soil conditions with clean, dry gravelly sand extending between 1.5 and 8.0 feet below ground level. This sand material percs slightly faster than 1 minute per inch. A seasonal high groundwater level was observed at 9.0 feet below ground level. A second perc test (2a) was conducted on 10/23/09 approximately 30 feet east of TH#2 to prove up a somewhat larger useable septic area. Due to the excellent percolation characteristics of the native sand, in combination with the limited available area, we propose to base the design on a soil application rate of 1.2 gpd/sq, fi, which is normally used for soils with perc rates between 1 and 5 minutes per inch. This application rate should work equally well for this cleaner material, and the native sand should provide adequate filtration of the effluent. The proposed design is for a 5-foot wide drainfield with 2.5 feet of sewer gravel under the distribution pipe. Using 1.2 gpd/sq, fi./day, the length of a standard 5-foot wide drainfield for a 3 bedroom residence would be (3 x 150)/01.2/5 = 75 lineal feet. With 2.5 feet of gravel under the distribution pipe, the length reduction factor (calculated per the wastewater ordinance) would be 0.6364 - giving a total required drainfield length of 48 feet. A replacement site for an ATS system is shown on the site plan. The proposed system is not expected to have any significant impact on present or future water supply and wastewater disposal systems serving adjacent properties, nor will it have any significant impact on reserved space-surface and subsurface, or on drainage. Please give me a call at 345-1355 if you have any questions on this submittal. Sincerely, Ted Moore, P.E. WELL ,-'" .... , N2, SE4, NE4, SE4, NW4, Sec 25, T12N, R3W .'"' R = 100' _:~ ,'" " "' INSTALL '?'",,,// ..-~'~ ./" '~ ' 1250 GALLON-----, ! '".,~. / SEPTIC /~/// STEP TANK ~ SYSTEM ./..:'~ / ................... - ...... \ .... '/'// ........... P";bP... \ ',,~ R',:lOO' '"-< ......... -:-: .... ! , ............ ? ....... '..... "i.,?.,j! ',-.: "'-,, :~ '~- /" ! '"'-., '"'-,. R = 100' ~-. '"', '"->,71 ",, '~ --~ /11 ",, PROPOSED ../ / "-, % ..... ~, ",, '"", 3-BEDROOM ........... t '~. '"",. .... ",~ /~,""", '"" ~'"'. '", " ....... ~ ~ "-T H /-'TJ',.., " H ' ' - t ', x .... r '. OUSE · '-. '. ;", .... " ', #3 " " : g ~ ~I~ i \ ',, ............ ~------/ .......... ~ ..... ..,. ~ \ i',, '--::,,,, ~ > ......... ', o ',, .......... ~ ~' ....... ~ ',.,.~ ~.' ',, '.,.~ ~, ........... , i ..... ':',, \ R = 100 >i ""-.. ~ ', "--., '-' ' ...... .. , FM. WELL i '""- ~_ \ \ X ~ '~- ..:<, ...... '\ ~\x~- .... ',,,, _} ............. : '-. ..~- \ ~ X'- ,' '...-" t.-~:.x--'.,-. '.~ / ......... U) ~ TEMF;.-..' ~ '"~'-, ;/T.B::< ...... ~ ~....~',, ....... ::,, - / ............................. ::;:::,.,~.!~,C..AB~~i...~~ ~,x~ <?.: ..... /' DRAINFIELD w. 2.5 GRAVEL J ........ ~' .:~.: '".. ~ "7' ..... \ ' ,/' and 1' FILTER SAND UNDER ............ :>-'-:':~' ~,:..'-.'::_.~,:'< P-T-~'--._: .-'"' PERF.DISTRIBUTION PIPE .... ........ M ATRF:AM~'--. ___~ ':--~u~/'% ~~:~;'~'~;' #2a - .... "8ITL FOR 15' REPLACEMENT TRENCH FOR ) '"'"-, F~ -'"',.,. ,T,~H~,,,'" ~\'~? ..... ADV TRTMT. SYST. SIZED @ 4.0 GPD/SQ. FT .// "'". ",,,~1 "'",,, "'",, i~ESM T." ii ii % R-lO0'- / : i } >i ............ [i / i LOT 1 ' / i ENGL~ S/D . .,, . ~..'%, -,-.-~ ~ '".... ~' ~r~'e' ".~'- ~A '"' S2, SE4, NE4, SE4, NW4, Section 25, T12N, R3W : ~ O~;' ~ TH '.%~ ~ %.. PROPOSED WELL AND SEPTIC SYSTEM : ~ .7 ,r+~-- ;~,. ~ ...... .. ......................... ~. ... SITE PLAN ~ ~.~/'.,X ..... ~-.~',z, ~. ....... ~ ~__ · THEODORE F. MOORE .e ..~ ~ SEPTIC ......... FLATTOP TECI-I~CAL SERVICES 1 INCH = 50 FEET : '~i~: :. CE - 3589. ; ~Jl~ AREA 14530 ECHO CANYON ROAD DRAWN BY TFM - · - 7'Z,' /'" *~- ~,~,, .o r ~{.~ ~.aF ANCHORAGE, ALASKA 99516 JULY, 2011 ~ 'e,,e,o ,~:~ NOTE: CONTOUR ~Tm~ofess~O~ INTERVAL = 4' NOTE: THIS IS NOT A SURVEYED PLAT. -- : ~'~'t~'~;~' ALL LOCATIONS SHOVVN ARE APPROXIMATE. 4" D-3034 FROM HSE. 1250-GALLON STEP TANK (w. 8' RISER) 1.25" DIA. SCHED. 40 PVC OR HDPE M.T. 5~4~ 1.25" DIA. SCHED. 40 PVC DISTRIBUTION PIPE w. 3/16" DIA. HOLES IN BOTTOM AT 18" O.C. 48/ PLAN VIEW SCALE 1" = 10' 48-FOOT LONG x 5-FOOT WIDE SOIL ABSORPTION DRAINFIELD w. 2.5' GRAVEL & 1.0' FILTER SAND UNDER DISTRIBUTION PIPE ~ OF I ~ · ~EODORE F. MOORE V~ %. CE-3589 .~ MOUND FINAL GRADE 6"+ -- 4" DIA. M.T. ~. FILTER FABRIC ~ 1.25" DIA. SCHED. 40 PVC ~ w 3/16" HOLES IN BOTTOM SPACED 18" O.C. 3' SOIL COVER 6 2.8' SEWER GRAVEL 1.0' FILTER SAND ORIGINAL GROUND DRAINFIELD CROSS-SECTION "A - A" SCALE' 1" = $' S2, SE4, NE4, SE4, NW4, Sec. 25, T12N, R3W SEPTIC SYSTEM DESIGN PLAN AND CROSS-SECTION FLATTOP TECHNICAL SERVICES 14530 ECHO CANYON ROAD ANCHORAGE, AK, 99516 SCALE: AS SHOWN DRAWN BY: TFM JULY, 2011 J TEST HOLE # 2 FLATTOP TECHNICAL SERVICES 14530 ECHO CANYON ROAD ANCHORAGE, ALASKA 99516 SOILS LOG -- PERCOLATION TEST LEGAL DESCRIPTION: S1/2, SE.!/~LNEI/4, SEI/4,~V~/!J~, Sec. 25, TI~2N, R_3_W,_~,M. DATE PERFORMED: May 2Z~ 2_0__0.9 ........................ PERFORMED FOR: Kevi_n_Qa_s~sity .................. DEPTH -- Pt. (feet) SM Reddish sandy loam 4 SP Gravelly sand 5 Clean, dry 7 8 9 10 11 12 13 14-- 1{5 -4 18- 10 20- GM Silty gravel Soft, few boulders Seeps below 10' SLOPE SITE PLAN .,. ",-., ".,. 81".. '.. ",.. . \ ",~ 0 ", '-, '. "~-, :3> #2 ~' 29 ;"-., P.~' T.H.~ 3~'~0 -~' --..... J l':'' -:- ~i ........... ~;ock Net Time Percometer Net Drop uate I,(eaolng Hme (minutes) Reading (inches) [ L ~1 12:51:3~ 1 ] 21 7/8 I 1/~ ~2. ..... ~5_3_~1~ ...... : . _2.~. 7!8 ..... ~ 1~2 _ [ Add~ater 12:53:47 23 3/8 COMMENTS: PERCOLATION RATE <1 (minutes/inch) PERC HOLE DIAMETER TEST RUN BETWEEN__2.5_, ...... FT AND 3.0' _ FT PERFORMED BY FLATTOP TECHNICAL SERVICES. I ~'-~__..~ ._ _ CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: "~ / ~- ~' _~. _//. ........... TEST HOLE # 2 FLATTOP TECHNICAL SERVICES 14530 ECHO CANYON ROAD ANCHORAGE, ALASKA 99516 SOILS LOG -- PERCOLATION TEST LEGAL DESCRIPTION: $1/2. SEl/4, NEll4. SEl/4, NWl/4. Sec. 25, T12N, R3W, S.M. DATE PERFORMED: May 27. 2009 PERFORMED FOR: Kevin Cassity DEPTH __ Pt. (feet) 1 SM Reddish sandy loam 3 4 SP Gravelly sand 5 Clean. dry 6 7 lO 11 GM Silty gravel Soft, few boulders Seeps below 10' SLOPE Depth to Groundwater Date Seeps at 10' 5/27/09 9.0' 6/9/09 11.5' 7/7/O9 Monitor tube dry 10/23/09 3 LO I SITE PLAN 16 Perc Test #2a Date Reading Clock Net Time Percometer Net Drop Time (minutes) Reading (inches) 10/23/0 9 5-aallon pre-soak 2:33:40 23 Dry 2:35:40 2 17 6"+ PERCOLATION RATE <<1 (minutes/inch) PERC HOLE DIAMETER TEST RUN BETWEEN 3.5' FTAND 4.0' FT COMMENTS: PERFORMED BY FLA'I-FOP TECHNICAL SERVICES. I ~"~ ~'~.¢',,.~. CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: ~',',~ / TEST HOLE # 1 · FLATTOP TECHNICAL SERVICES 14530 ECHO CANYON ROAD ANCHORAGE, ALASKA 99516 SOILS LOG -- PERCOLATION TEST LEGAL DESCRIPTION: S1/2_, SEll4, NEll4, SEl/4, NWl/4, Sec. 25, T12N, R3W, S.M. DATE PERFORMED: [Ylla~v_2~ 2_0_0_9 PERFORMED FOR: Kevin Cassit,j_ DEPTH __ (feet) 1 5 6 7 8 9 10 11 15 16 17- 18 19-- 20-- COMMENTS: Pt and loam SP/SM Slightly silty gravelly sand Gray/black, dry Few scattered lenses of ML SLOPE SITE PLAN GM Silty gravel w. cobbles and boulders Depth to Groundwater Date 5/27/09 6/9/09 _ None M.T. dry M.T. dry_ MT. dry 7 / 7J_0__9 10/23/09 B.Ho Reading Clock Net Time Percometer Net Drop Time (minutes) Reading (inches) 5-ga[l_o_o Presoak~ 12:04:30 23 3/8 #1 12:05:30 1 19 7/8 3 1/2 #2 #3 12:Q6.'3_0 12:07:00 0.5 _1_8____ I 7/8 PERCOLATION RATE <1 TEST RUN BETWEEN 3.0 5~ga!.Lo_n~ pr e_s_oak_e n ti~eJ y_ab_s_o~b_~L _wltbi n _3_m i~n u te~ (minutes/inch) PERC HOLE DIAMETER FT AND 3~5 FT PERFORMED BY FLATTOP TECHNICAL SERVICES. I ~'"-~/' ~.t CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: 7 TEST HOLE # 3 FLATTOP TECHNICAL SERVICES 14530 ECHO CANYON ROAD ANCHORAGE, ALASKA 99516 SOILS LOG -- PERCOLATION TEST LEGAL DESCRIPTION: DATE PERFORMED: PERFORMED FOR: DEPTH (feet) 1-~ 2 3-- Aw 11 Sl/2, SEl/4, NEll4, SEl/4, NWl/4, _Sec. 25, T12N, R3W, S.M. _ M a~L~ 7_~?-~Q09 Kevin Cassity Pt. SM Reddish sandy loam SP Somewhat silty Sandy gravel GM Silty gravel Water encountered SLOPE Depth to Groundwater Date 10' 5/27/09 7=.2.5' 6/9/09 10.3' 7/7/~__ M.T. dry 10/23/09 SITE PLAN Reading 12.~D r_eAQ a k Start #1 Add water #2 Add water Clock Net Time Percometer Net Drop Time (minutes) Reading (inches) 27 1/2 12:19:20 23 1/8 12:20:20 1 1 3/8 12:20:40 2:.t5 _ 21 3-/4 23 3/8 23 3/8 1 _1_/2___ #3 12:23:15 I 21 7/8 1 1/2 PERCOLATION RATE <1 (minutes/inch) PERC HOLE DIAMETER TEST RUN BETVVEEN 2.75 FT AND 3.25 FT COMMENTS: PERFORMED BY FLATTOP TECHNICAL SERVICES. I ~ '~'~"'~--.¢.'-.¢_.=.. CERTIFY THAT THIS TEST WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: ~ f ~- ¢ //I o~lattop TechnicalSem, ices 14530 Bclto Canyon Poad, And~orage, AK 99516 Phone (907) 345-1355 S %, SE %, NE %, SE %, NW %, Section 25, T12N, R3W 12940 Michael Road Wastewater disposal system Specifications 1.0 General: 1.1 The scope of the project consists of installing a 1250-gallon STEP tank that pumps effluent into a 48-foot long by 5-foot wide soil absorption drainfield with 1.0 feet of filter sand and 2.5 feet below the horizontal distribution pipe (2.8' total gravel). 1.2 Construction shall be as depicted on the approved site plan and design drawings. Minor deviations from these drawings may be allowed or required by the engineer conducting the inspections. All construction procedures and material specifications shall conform to Municipal and State requirements. All separation distances shall be in conformance with Municipal requirements, unless specifically waived. 1.3 The contractor shall be responsible to obtain any necessary utility locates, and to work around any buffed utilities. 1.4 Unless agreed otherwise, the contractor shall be responsible for any tree clearing and grubbing necessary to complete the project. 1.5 The contractor shall provide adequate cover material and rough grading over all system components to ensure that proper drainage is achieved after settlement and that there are no residual depressions. Insofar as possible the contractor shall minimize damage to trees and existing lawn areas. 1.6 Unless specifically agreed otherwise, the homeowner shall be responsible for finish grading after the soil is compacted, and seeding all areas disturbed by the construction. 1.7 Prior to the start of construction the property owner shall arrange for a professional land surveyor to stake out the proposed well location 2 feet south of the north property line and 28 feet east of the intermittent stream. The surveyor should confirm that this well site is at least 103 feet from the septic tank standpipes on the lot to the north. Next~ the surveyor should set laths at approximatelF 25- foot intervals in the vicinity of the proposed STEP tank and drainfield to delineate the l O0-foot protective radius from the well and the l O0-foot offset from the intermittent stream- 2.0 STEP Tank: 2.1 A new 1250-gallon Municipally approved STEP tank shall be installed in the general location shown on the site plan, with particular care taken to minimize disturbance of mature trees, and to ensure that it is outside the 100 foot setback from the well and surface water. 2.2 All pipe connections to the tank shall be equipped with waterproof mechanical couplings. 2.3 The discharge line from the septic tank shall be 1.25" diameter schedule 40 PVC or HDPE. 2.4 The contractor shall be responsible to obtain the necessary Municipal electric permit and inspection, and shall provide a copy of the electrical inspector's report to the engineer overseeing the construction of the wastewater disposal system. 2.5 The second compartment of the tank containing the lift pump mechanism shall be equipped with a watertight, insulated manhole riser and cover extending a minimum of 6" above final grade with positive surface drainage away from the manhole. The contractor shall be responsible for determining the necessary length of the manhole riser. The anticipated riser length is approximately 8 feet. 2.6 The on, off, and alarm floats shall be set at the elevations specified by the lift station supplier, and their proper operation shall be verified by the contractor. 3.0 Soil absorption drainfield: 3.1 The soil absorption system shall be constructed in the location shown on the site plan by excavating a 48-foot long by 5-foot wide drainfield footprint to a depth of 6 feet below ground level. 3.2 The bottom of the excavation should be level. A total of 1.0 feet of washed ISF filter sand shall be placed in the excavation and compacted by foot to bring the elevation up to 5.0 feet b.g.l. 3.3 A total of 2.8 feet of sewer gravel shall be placed on top of the sand with the distribution pipe laid level such that the pipe invert is no less than 2.5 feet above the bottom of the sewer gravel. The distribution pipe shall be 1.25" diameter schedule 40 PVC with 3/16" holes drilled in the bottom atl 8 inch spacing. 3.4 Monitor tubes shall be of 4" diameter and installed in the locations shown on the design drawings. The portion of the monitor tube extending through the sewer gravel shall be perforated. 3.5 Approved filter fabric shall be placed over the entire top surface of the sewer gravel, prior to backfill. 3.6 The backfill shall be mounded a minimum of 6 inches above original ground level. 3.7 The homeowner shall be responsible for arranging to have the site finish graded after the backfill material has stabilized, and for placement of adequate seed to promote rapid revegetation. 4.0 Inspections: 4.1 A minimum of 5 engineering inspections will be required during the course of the project: (1) initial stakeout with the contractor to establish the location of the system and to discuss the plans, specifications and construction procedures, (2) after the native material has been excavated to expose the infiltrative surface to ensure that it conforms with the soil test information, (3) after the filter sand has been placed and compacted, (4) after the sewer gravel is in place and the distribution pipes have been laid and connected up to the septic tank, but prior to placement of filter fabric, and (5) after rough backfill and grading is complete. The septic tank installation inspection shall be in conjunction with one of the other listed inspections. 4.2 The installer shall coordinate the timing of the inspections with the engineer sufficiently far in advance to ensure the availability of the engineer.