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HomeMy WebLinkAboutBIRCH PARK S11995 Onsite File Birch Park #511995 ANDERSON ENGINEERING P.O. BOX 240773 ANCHORAGE, AK 99524 522-7773 677-7766 (FAX) Municipality of Anchorage Building Safety Division On Site Water and Wastewater Program 4700 Elmore Street Anchorage, AK 99507 Attention: Debbie Wockenfuss Subject: Birch Park Subdivision S-11995 Septic System Feasibility Study Dear Debbie: We recently reviewed the proposed plat for Birch Park Subdivision with the intent of completing a subsurface soils study to identify areas suitable for the construction of on site septic system to dispose of septic effluent to be generated from the houses proposed for construction on the newly created lots. Birch Park Subdivision is located near the intersection of East 112th Avenue and Birch Road. The parcel will be divided into 3 individual lots with the remaining land added to the existing lot to the south which will become Lot 4. The tract is currently identified as Tract A, BLM Lot 40 and BLM Lot 33. The new subdivision will be known as Birch Park Subdivision, Lots 1 through 4. Access to the new lots will be off of Birch Road and East 112th Avenue. The ground surface of the lots slopes from the east to the west at a grade approximating 10% to 15%. Flatter areas were located on all of the proposed lots for home sites and septic systems. Lot sizes are all in excess of 40,000 square feet in surface area and sufficient space is available for placement of wells and septic systems to meet the 100' setback requirement. Test holes were placed on the proposed lots between March 18 and March 22, 2013. Soil assessment and percolation testing continued during that period. Water monitoring has been ongoing with readings last taken on May 15, 2013. To date no water has been noted in any of the test holes to depths of over 20'. The purpose of the test holes was to assess the underlying soil conditions and to determine whether septic systems could be placed on the lots to serve single-family homes. The test holes were placed to various depths ranging from 16' to 20.5' with no bedrock or impermeable lenses of material encountered. The locations of the test holes were determined in the field for use in the future for developing septic systems. Percolation benches were constructed at various depths in the holes, but primarily 3' to 4' below the original ground surface. A percolation cavity was prepared to determine the absorptive characteristics of the soils encountered. The cavity was presoaked in accordance with Municipal requirements and a percolation test performed. The results of the tests are included in the attached documentation. In every case silty sand (SM) with varying degrees of silt was Birch Park Subdivision S-11995 July 24, 2013 Page 2 encountered full depth except in Test Hole Nos. 3 and 5 where poorly graded gravel with silt (GM/GP) was noted at 11' to 12'. This lense extended to the bottom of each hole. The percolation rate in the SM material ranged from 48 minutes to 60 minutes per inch. The GM/GP percolated much faster at 5 minutes per inch. All work was completed under the direction of technicians and engineers at Anderson Engineering. The results of the percolation tests and test hole logs are included as well as the water monitoring results. Based on our field study and water monitoring completed to date it appears all lots of the proposed subdivision are capable of supporting an onsite septic system. A 16,000 square foot reserve area is shown on each of the proposed lots for septic system construction. In addition, Test Hole Logs and a Location Map are included which illustrate soils encountered, percolation rates and their respective location on the individual lots. Sincerely, C-CL-6f Michael E. Anderson, P.E. Attachments .7 OF 44'44* (-).." '••.:9�i a •' 49th •'11� y� .: �µ s... • 0,0"?i,". MICHAEL E. ANDERSON •!rf's,• NO. CE-4381 ;'� ...................... ���i MUNICIPALITY OF ANCHORAGE 'i���a rrvi,a/ iv DEVELOPMENT SERVICES DEPARTMENT •��zP�• ......••• •... 4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 ''49th l' .,:**,. SOILS LOG - PERCOLATION TEST i Ea -, •• • 7, '.NICHAEL E. ANDERSON Vi LOT I, BIRCH PARK SUB. �•J/ ;% NO. CE-4381 ;•;�� LEGAL DESCRIPTION: �J q: i PERFORMED FOR: JAMIE DITTRICH �• .< ▪�FES;�1���• DATE: 3/18/13 PROJECT No.: PARCEL ID#: TECHNICIAN: A. HARALA Professional Engineers Stamp: DLI' I I TEST HOLE 1 (redo OB/OG SLOPE SITE PLAN 1 4 2 a 4 G. 4 2% SM 5 SEE SITE PLAN �, 4 I 6 4 3 7 a d 8 • 9 —4 a 4 10 WAS GROUND WATER ENCOUNTERED? No IF YES n WHAT DEPTH? DEPTH OF WATER AFTER MONITORING: NONE c% 1 1 G DATE OF MONITORING: 5/15,13 • E 12 4 GROSS TIME NET TIME DEPTH TO NET DROP 13 n DATE READING (MINUTES) (MINUTES) WATER (INCHES) (INCHES) 14 ° . • TEST HOLE PRESOAKED PRIOR TO TESTING: 15 3/18 1 9:40 5.75" 4 2 10:10 30 6.375" .625" 16 3 10:11 5.69" 17 a 4 10:41 30 6.315" .625" 18 • • " BOH @ 18.5' 5 10:42 5.75" 19 6 11 :12 30 6.375" .625" 20 PERCOLATION RATE: 48 (MIN/INCH) PERC. HOLE DIA. 8" (INCHES) TEST RUN BETWEEN: 3 FT. and 4 FT. COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST. TEST PERFORMED BY ANDERSON ENGINEERING. I, MICHAEL E. ANDERSON CERTIFY THAT THIS WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS DATE: 7/24/13 MUNICIPALITY OF ANCHORAGE ..�� tilki,a'• DEVELOPMENT SERVICES DEPARTMENT =4,, P.•..• "'• 5,1s 4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 : :4./ 49th ", 1' *• �% SOILS LOG - PERCOLATION TEST 1>vt.-4,/,E . •• • .g.11 MICHAEL E. ANDERSON I Z, LEGAL DESCRIPTION: LOT I, BIRCH PARK SUB. ��'�+' No. ��aaet ; iti, • PERFORMED FOR: JAMIE DITTRICH ••%titPROFESS COV DATE: 3/18/13 PROJECT No.: Illesusix4 PARCEL ID#: TECHNICIAN: A. HARALA Professional Engineers Stamp: I)I?PTII TEST HOLE 2 (feet) OB/OG SLOPE SITE PLAN 1 4 2 3 a 4 4 2% SM 5 SEE SITE PLAN 4 ? 6 4 7 a d 8 • . 9d :a 10 WAS GROUND WATER ENCOUNTERED? No IF YES @ WHAT DEPTH? DEPTH OF WATER AFTER MONITORING NONE 5% 11 DATE OF MONITORING: 5/15/13 • d 12 . .° •� GROSS TIME NET TIME DEPTH TO (INCHES) NET DROP 13 d DATE READING (MINUTES) (MINUTES) WATER (INCHES) 14 .° • TEST HOLE PRESOAKED PRIOR TO TESTING: 15 3/18 1 11:51 5.44" 4 2 12:21 30 5.94" .50" 16 5.375" 3 12:22 17 4 12:52 30 5.875" .50" 18 BOH @ 16.0' 5 12:53 5.50" 19 6 1:23 30 6.00" .50" 20 PERCOLATION RATE: 60 (MIN/INCH) PERC. HOLE DIA. 8" (INCHES) TEST RUN BETWEEN: 3 FT. and 4 FT. COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST. TEST PERFORMED BY ANDERSON ENGINEERING. I, MICHAEL E. ANDERSON CERTIFY THAT THIS WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS DATE: 7/24/13 MUNICIPALITY OF ANCHORAGE .��,,�a_trvi,ll�i,�/ DEVELOPMENT SERVICES DEPARTMENT �'.*** 444%. DEVELOPMENT 4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 �,•' "�;' �1• i 49th SOILS LOG - PERCOLATION TEST • ,ig .dL.ELL"-, ; MUNICIPALITY OF ANCHORAGE .411+11rrrit_ DEVELOPMENT SERVICES DEPARTMENT •.��P�� S♦1♦ 4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 moi, .0. (,4j. L 49thSOILS LOG - PERCOLATION TEST Ea-4A MICHAEL E. ANDERSON LEGAL DESCRIPTION LOT 2, BIRCH PARK SUB. 1♦�,�+�.. No. CE-4381 �� PERFORMED FOR: JAMIE DITTRICH ♦♦♦ R. G� �• DATE: 3/18/13 PROJECT No.: ♦,,1� sim*-4•• PARCEL ID#: TECHNICIAN: A. HARALA Professional Engineers Stamp: DEFriI TEST HOLE 4 (feet) OB/OG SLOPE SITE PLAN 1 . 4 2 3 O. 4 2% SM 5 ° s; SEE SITE PLAN v 4 6 7 • G 8 9 a 4 ' 0 WAS GROUND WATER ENCOUNTERED? NO 1 ° IF YES @ WHAT DEPTH? S DEPTH OF WATER AFTER MONITORING: NONE 5% 1 1 DATE OF MONITORING: 5/15'13 • G 12 • .° 4 GROSS TIME NET TIME DEPTH To NET DROP 13 n DATE READING (MINUTES) (MINUTES) WATER (INCHES) (INCHES) 14 ° TEST HOLE PRESOAKED PRIOR TO TESTING: 15 3/19 1 10:12 7.25" xl 2 10:42 30 7.81" .56" 16 3 10:43 7.31" 17 • a 4 11:13 30 7.875" .56" 18 BOH @ 18.7' 5 11:14 7.375" 19 6 11:44 30 7.935" .56" 20 PERCOLATION RATE: 54 (MIN/INCH) PERC. HOLE DIA. 8" (INCHES) TEST RUN BETWEEN: 3 FT. and 4 FT. COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST. TEST PERFORMED BY ANDERSON ENGINEERING. I, MICHAEL E. ANDERSON CERTIFY THAT THIS WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS DATE: 7/24/13 MUNICIPALITY OF ANCHORAGE 440,1k yar>,i,, DEVELOPMENT SERVICES DEPARTMENT ••� -..... ..... '• �♦14• 4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 10 49th •SOILS LOG - PERCOLATION TEST i�� F s /.1.MICHAEL E. ANDERSON : t LEGAL DESCRIPTION: LOT 3, BIRCH PARK SUB. �V�:1>'.. No. CE-4381 ��, ti PERFORMED FOR: JAMIE DITTRICH �• * DRLE si P DATE: 3/18/13 PROJECT No.: ',1�psssi�•• PARCEL ID#: TECHNICIAN: A. HARALA Professional Engineers Stamp: DHPTII TEST HOLE 5 (feet) OB/OG SLOPE SITE PLAN 1 A 2 3 A. 4 2% ° SM 5 SEE SITE PLAN A DENSE Z 6 • 4 • 7 a 8 94 d 10 WAS GROUND WATER ENCOUNTERED? NO IF YES @ WHAT DEPTH? S DEPTH OF WATER AFTER MONITORING NONE 5% 11 DATE OF MONITORING: 5/15/13 A 12 .° •4 GROSS TIME NET TIME DEPTH TO NET DROP 13— . • DATE READING (MINUTES) (MINUTES) WATER (INCHES) n GM/GP (INCHES) 14 •° • COBBLES TO 8" TEST HOLE PRESOAKED PRIOR TO TESTING: 15 3/22 1 11:18 3.375" 2 11:48 30 9.50" 6.125" 16 3 11:49 3.50" 17 d 4 12:19 30 9.50" 6.00" 18 • - 5 12:20 3.25" 19 6 12:50 30 9.25" 6.00" 20 BOH @ 20.5' PERCOLATION RATE: 5 (MIN/INCH) PERC. HOLE DIA. 8" (INCHES) TEST RUN BETWEEN: 1 1 FT. and 12 FT. COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST. TEST PERFORMED BY ANDERSON ENGINEERING. I, MICHAEL E. ANDERSON CERTIFY THAT THIS WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS DATE: 7/24/13 MUNICIPALITY OF ANCHORAGE .00+tvnniiiii,, DEVELOPMENT SERVICES DEPARTMENT ���P�E � •t• 4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 i .' •1•, 49th SOILS LOG - PERCOLATION TEST i7�' ,,.,,-,-L �-�I,�....J- 77,p,%MICHAEL E. ANDERSON i LEGAL DESCRIPTION: LOT 3, BIRCH PARK SUB. ���:›;,., NO. CE-4381 .'�tiC': r�, PERFORMED FOR: JAMIE DITTRICH 7-x:0 *',v.. DATE: 3/18/13 PROJECT No.: ♦♦••,il� �5ivis-4 PARCEL ID#: TECHNICIAN: A. HARALA Professional Engineers Stamp: I)FPrll TEST HOLE 6 (feet) OB/OG SLOPE SITE PLAN 1 . 4 2 3 d. 4 2% SM 'it 5 SEE SITE PLAN . .4 2 6 4 7 a A 8 9a d WAS GROUND WATER ENCOUNTERED? NO 10 ° IF YES a WHAT DEPTH? DEPTH OF WATER AFTER MONITORING: NONE 5% 11 DATE OF MONITORING: 5/15/13 • d 12 L GROSS TIME NET TIME DEPTH TO NET DROP 13 . • DATE READING (MINUTES) (MINUTES) WATER (INCHES) (INCHES) 14 ° • TEST HOLE PRESOAKED PRIOR TO TESTING: 15 • 3/18 1 10:29 5.25" 4 2 10:59 30 5.875 .625" 16 • 3 11:00 5.50" 17 ° d 4 11:30 30 6.125" .625" 18 BOH @ 18.7' 5 11 :31 5.375" 19 6 12:01 30 6.00" .625" 20 PERCOLATION RATE: 48 (MIN/INCH) PERC. HOLE DIA. 8" (INCHES) TEST RUN BETWEEN: 3 FT. and 4 FT. COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST. TEST PERFORMED BY ANDERSON ENGINEERING. 1, MICHAEL E. ANDERSON CERTIFY THAT THIS WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS DATE: 7/2[4/13 MUNICIPALITY OF ANCHORAGE '.00pin iviit_' DEVELOPMENT SERVICES DEPARTMENT �*�p� •••"••• s�1� 4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 i ,1� •• .j. • SOILS LOG - PERCOLATION TEST t / •• -O. '.MICHAEL E. ANDERSON ,r�vi r NO. CE-4381 C! LEGAL DESCRIPTION: LOT 4, BIRCH PARK SUB. ♦sT •. v~, PERFORMED FOR: JAMIE DITTRICH ��♦14� .?" '��P� �� DATE: 3/19/13 PROJECT No.: ,�� 5ss 6��• PARCEL ID#: TECHNICIAN: A. HARALA Professional Engineers Stamp: DEPTH TEST HOLE 7 (leer) OB/OG SLOPE SITE PLAN 1 4 2 a 3 e. 4 2% SM 5 SEE SITE PLAN a 6 4 7 a d 8 9d d 1 0a WAS GROUND WATER ENCOUNTERED? NO IF YES @ WHAT DEPTH? S DEPTH OF WATER AFTER MONITORING NONE 5% 11 • DATE OF MONITORING: 5/15113 C 12 a '4 GROSS TIME NET TIME DEPTH TO NET DROP 13 e DATE READING (MINUTES) (MINUTES) WATER (INCHES) (INCHES) 14 .a TEST HOLE PRESOAKED PRIOR TO TESTING: 15 • 3/20 1 11:14 5.75" 4 2 11:44 30 6.31" .56" 16 17 ••• a BOH @ 17.0 3 11:45 5.50" 4 12:15 30 6.06" .56" 18 5 12:16 5.75" 19 6 12:46 30 6.31" .56" 20 PERCOLATION RATE: 54 (MIN/INCH) PERC. HOLE DIA. 8" (INCHES) TEST RUN BETWEEN: 3 FT. and 4 FT. COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST. TEST PERFORMED BY ANDERSON ENGINEERING. I, MICHAEL E. ANDERSON CERTIFY THAT THIS WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS DATE: 7/24/13 MUNICIPALITY OF ANCHORAGE .++e++••rvii,a DEVELOPMENT SERVICES DEPARTMENT **�� A(Q'�1 4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 '/ �� '.'91t SOILS LOG - PERCOLATION TEST ;1 E6j� s �. '.MICHAEL E. ANDERSON •i LEGAL DESCRIPTION: LOT 4, BIRCH PARK SUB. 1��� No. CE-4381 '; �� PERFORMED FOR: JAMIE DITTRICH �'44e x-� �� P���� DATE: 3/19/13 PROJECT No.: •,�� �S•+ +�• PARCEL ID#: TECHNICIAN: A. HARALA Professional Engineers Stamp: DEPTH TEST HOLE 8 (teet) OB/OG SLOPE SITE PLAN 1 1 4 2 3 4. 4 2% cli 5 ° SM SEE SITE PLAN • 4 6 4 7 a d 8 9 .4 4 1 O WAS GROUND WATER ENCOUNTERED? NO IF YES @ WHAT DEPTH? S DEPTH OF WATER AFTER MONITORING. NONE 5% 1 1 DATE OF MONITORING: 5/15%13 • d 12 GROSS TIME NET TIME DEPTH TO NET DROP 13 . •d DATE READING (MINUTES) (MINUTES) WATER (INCHES) (INCHES) 14 .° • TEST HOLE PRESOAKED PRIOR TO TESTING: 15 • • 3/20 1 11:17 6.94" d 2 11:47 30 7.50" .56" 16 6.75" 17 ... ° BOH @ 17.0' 3 11:49 4 12:19 30 7.31" .56" 18 5 12:21 6.50" 19 6 12:51 30 7.06" .56" 20 PERCOLATION RATE: 54 (MIN/INCH) PERC. HOLE DIA. 8" (INCHES) TEST RUN BETWEEN: 3 FT. and 4 FT. COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST. TEST PERFORMED BY ANDERSON ENGINEERING. 1, MICHAEL E.ANDERSON CERTIFY THAT THIS WAS PERFORMED IN ACCORDANCE WITH ALL STATE AND MUNICIPLE GUIDELINES IN EFFECT ON THIS DATE: 7/24/13 7 7 / I • 2I l 30 �� HIGGINS� E §.___1 — / I � =,,,, I c -�� I `� EA' ,<1 12z H AVE UE \ S 89'56' = _ EAST 112TH AVENUE ` ��� � '36~ R01 D :IC ' I BY IS P • / — � T — / s — 211-7— - - i .-. 121•-.70— --- 189.6•' 3�J�LM I RESERVATI O'�POsed D11 S P R I N G F O R E S T S 0 U T H M SER TRACT 20 o a •• j o m�� o • T m; � OT'2 , N ,) _L.04----- N ' ao I CJI _ T •• T E -• 4.503 .) (54.486 .) Oi .� 0 /E -- _ •:!. O I 47.910 .F. �..-_> 7—i-7---. e (54.N8 S.F.)— _ r1=•S S.F. 41..45 55. •+ M a0 I N N • .., , / / 1p• •. I ��ti F � o ..1e.000 salwl. F«� .. a v m :- Ma N U 3 r v \ Z o o I 2t9 7T FAIN 18 Aria� 1931 i1 w lin I / �g�g'�E 435.: �s�, ��1 0.000 oill •' '• o / I / ..f/7 1 . ESMT. G "''O —— � N / – ( –– BY T : P • �` 0.40 i ____. __ _r_. of a Nil ,1610S :9'57'07"E } °' 00 50.00' 3 / 0 4 `N 98,356 S.F. o C\' I (107,659 S.F.) \, 001 o I J-10' UTIL. ESMT. i a 0 M AII N 0 I S 0 M A L L E Y PARK I 68 I S Existing Z TRACT A N• < v'� h(\'''.6-(T--..''\,( j6 4 Well l Q 125.40' SO•68,N S 89'57'07"E 367.45' N 2 1 – – – — S 89'57'07"E \ \N FEN ICK CIRCLE N \ /" `�. –1 Q LEGEND I ----T I 1 2 50' �, 40C I 408 I 40AI gi ' ® Test Hole Designation and Location Well Location with 100' Protective Radius _ ____ J I I I s -__L___ _I_ L L - OF ar C',/ ....:43qlt 1. BIRCH PARK SUBDIVISION 49th i‘ \*°01 ;p:t41 `RSl)N 'W' WELL AND SEPTIC SYSTEM PLAN LOTS 1 THRU 4 #i%;.., No. CE-4381 ;°.� SCALE 1 = 100 • I A SUBDIVISION OF TRACT A, BLM LOT 40 (PLAT NO. 70-377), AND BLM LOT 33, LOCATED •�,'<..' _j �' � �• WITHIN THE NE 1/4, SECTION 22, T12N, R3W, S.M., ALASKA, ANCHORAGE RECORDING 1144.PP........OC� 44• DISTRICT, THIRD JUDICIAL DISTRICT, AND CONTAINING 5.41 ACRES, MORE OR LESS. ANDERSON ENGINEERING P.O. BOX 240773 ANCHORAGE, AK 99524 522-7773 677-7766 (FAX) July 25, 2013 Municipality of Anchorage Building Safety Division On Site Water and Wastewater Program 4700 Elmore Street Anchorage, AK 99507 Attention: Debbie Wockenfuss Subject: Birch Park Subdivision, S-11752- It g q 6 Water Availability Study Dear Debbie: We have collected information on several wells in the area of the proposed Birch Park Subdivision to estimate the possible depths and production rates of wells to be constructed in the future on Lots 1 through 3. Lot 4 currently has a well in place. The lot is currently identified as Lot 40, Tract A of T12N R3W Section 22. Field investigations indicate all of the wells were constructed without the presence of bedrock and cased the entire depth. In all cases the well are shallow in comparison to most wells in the Anchorage area with the deepest at 197' and the shallowest at 120'. SECLUSION SUBDIVISION WATER AVAILABILITY STUDY WELL LEGAL DESCRIPTION DEPTH PRODUCTION - LOG PRODUCTION -TEST Jodie Estates, Lot 1 134' 10 GPM 4.5 GPM Jodie Estates, Lot 2 120' 8 GPM 4.03 GPM Jodie Estates, Lot 3 128' 10 GPM Jodie Estates, Lot 4 129' 10 GPM Higgins, Lot 2 184' 40 GPM Birch Park Subdivision July 24, 2013 Page 2 T12N R3W SEC22 Lot 32 South 1/2 197' 60 GPM Lot 40 Tract A(Fenwick Circle) 146' 15 GPM 7.8GPM T12N R3W SEC 22 Lot 40A 174' 7.8 GPM Benslers Estates, Lot 1 138' 15 GPM 8.8 GPM Benslers Estates, Lot 2 106' 7 GPM 4 GPM Higgins Estates, Lot 1 148' 50 GPM Thunderbrush, Lot 1 146' 15 GPM 5 GPM It is obvious from our study that any wells to be constructed in Birch Park Subdivision in the future will be placed to depths of less than 200' and will probably be cased the entire depth. The production rates will be sufficient to support a four bedroom home and can be expected to be between 4 and 8 gallons per minute. Sincerely, Michael E. Anderson, P.E. Attachments 0 �• •49th •• ♦♦ •♦ Mic7f ANDERSON /4/ ♦♦♦ ---,•••? ,\ No. CE-4381 s���� 1