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Home My WebLink AboutGLACIER VUE S12357 Onsite File Glacier Vue #512357 ANDERSON ENGINEERING P.O. BOX 240773 ANCHORAGE, AK 99524 522-7773 677-7766 (FAX) September 29, 2017 Municipality of Anchorage Building Safety Division On Site Water and Wastewater Program 4700 Elmore Street Anchorage, AK 99507 Attention: Debbie Wockenfuss Subject: Glacier Vue Subdivision, S-12357 Septic System Feasibility Dear Debbie: The owner of BLM Lot 21 , Section 4, T15N, R1VV S.M. intends to subdivide the tract into two lots. The two lots are fronted by Glacier Vista Road at its intersection with Oberg Road in the Chugiak area. The westerly half of the lot is currently under development and a well and septic system has recently been constructed. The permits were issued on the entire lot, but construction was limited to the confines of the westerly half. The new subdivision will be known as Glacier Vue Subdivision, Lots 21A and 21 B. The ground surface of the lots slopes from the north to the south at varying grades approximating 5%. Flatter areas were located on both of the proposed lots for home sites and septic systems. Lot sizes are 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 on April 5 of this year. Soil assessment and percolation testing was completed on that day. Water monitoring has been ongoing with readings to be taken through October 15, 2017. 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 11' to 15' 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 6' 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. Well graded gravel sand (SM/SW) with varying degrees of gravel and silt was encountered to Glacier Vue Subdivision September 29, 2017 Page 2 the bottom of each test hole. The percolation rate in this material ranged from less than 1 minute per inch on Lot 21A to 30 minutes per inch on Lot 21B. Soils encountered on Lot 21A appeared to be more than 50% sand. A sand liner is not anticipated to be required on this lot. A 10,000 square foot septic system reserve area is shown on Lot 21A. Lot 21B has an approved septic system on the lot. 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. Groundwater was found in Test Hole 1, but was initially absent in the remaining holes. The water level has been monitored through the high water period of May 15 through September and levels recorded. The water levels were noted at 3.5' below the surface in test holes 3 & 4 on June 2, 2017, and the system for Lot 21B was designed based on that information. Water levels were at 5.5' for test holes 1 & 2 on September 29, 2017. Test Hole Logs and a Location Map are included which illustrate soils encountered, percolation rates and their respective location on the individual lots. Or 411, Sincerely, , I# O ; r 1.4 d► ,,+�.:•• ; Set.. o Benjamin Schiller, P.E. �,�. •`� xR � •• •. � Attachments t� ' � --LOQ-6---- Lit 5 Weilting j 1 ... T KIMPTON SUED. Existing i Lot 1 Veil i 1% i f Existing I f / Septic i o 1 , GLACIER VISTA ROAD f:, 130.0' 1 \�' I o r I 0 Lot 1 *Exdstlna 50' SECTION ` J Vel 'LINE EASEMENTS ----- _ ------X305---- 1 1 ' Existing I /`\ IVeil I /' `•� , ,s, 1 Exis%Ottting 1 I ,` / _'-�,;Lot '21B ,-----Lot 21A) i N Lot 22 % o o C::::::3‘ I T112 1�+3 1111 I i • I , • I s.pHa Raaarte Area L10,000 Square Feet 150.0' 300.0' 150.0' 7 Lot 18 I NOTE: Test Hole Locations Not Exact. •Existing ' Yell I / \ / , I L ' , I .��•,taljt\y M_ 1 1 Existing 1 I ..,•(♦" - �►♦ i11 Well ' C-)‘.K. 1 ,Ikr%. .. I. t * % GLACIE,R VUE SUBDIVISION • B NJAMI . CHILLER - t 70 VA Lots 21A and 21B i v VI No. CE-12592 ./....,, i ••, � «.i / .• WELL AND SEPTIC PLAN II %�� ai s# SCALE 1' = 100' MUNICIPALITY OF ANCHORAGE ��>>N\\‘` DEVELOPMENT SERVICES DEPARTMENT '��Q'( 4/...1,;‘k`� 4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 %*•STM 1A *�4 SOILS LOG - PERCOLATION TEST t,r 'L Benj in Schiller LEGAL DESCRIPTION: LOT 21A, GLACIER VISTA SUBDIVISION ��Irk e, CQE22017 .7.c� � 1�lF�f�PROFESSION�`�� PERFORMED FOR: TROY DAVIS HOMES \\ ``ESS\° DATE: 4/5/17 PROJECT NO.: Professional Engineers Scamp: PARCEL ID#: TECHNICIAN: J. MILLETTE DEPTH TEST HOLE 1 (feet) OB/OG SLOPE SITE PLAN 1 - 4 2 C 3 : 4 4. 4 5 - SEE SITE PLAN • 4 SILTY SAND 1 6 4 . WITH GRAVEL 1i • SM/SW 7 — a c 8 - -- 9 —44 -4 10 .. v WAS GROUND WATER ENCOUNTERED? YES IF YES @ WHAT DEPTH" 9 DEPTH OF WATER AFTER MONITORING: 5.0' 11 G ' DATE OF MONITORING: 1011/17 • — 12 .,t TH DATE READING GROSS TIME NET TIME WATER F NET DROP 13^ BOH @ 13' (MINUTES) (MINUTES) (INCHES) (INCHES) 14 TEST HOLE PRESOAKED PRIOR TO TESTING: 15 4/5 1 4:0014:04 4 8.00'/0.00" 8.00" 16 2 4:05/4:09 4 8.00'70.00" 8.00" 3 4:10/4:14 4 8.00"/0.00" 8.00" 17 4 4:15/4:19 4 8.00"/0.00" 8.00" 18- 5 4:20/4:24 4 8.00"/0.00" 8.00" 19 6 4:25/4:29 4 8.00“/0.00" 8.00" 20 PERCOLATION RATE: <1 (MIN/INCH) PERC.HOLE DIA. 6" (INCHES) TEST RUN BETWEEN: 3 FT. and 4 FT. COMMENTS: TEST HOLE PRE SOAKED PRIOR TO TEST. SOIL MATERIAL APPEARS TO BE >50% SAND. MUNICIPALITY OF ANCHORAGE DEVELOPMENT SERVICES DEPARTMENT :749S 4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 ecb.• •• . �� +� *:49TN �\ :*Y% SOILS LOG - PERCOLATION TEST ,,, • Benj in Schiller ��F •. CE 12592 LEGAL DESCRIPTION: LOT 21A, GLACIER VISTA SUBDIVISION irt��sjF�.• Oct 1201? .:Jo 4 PERFORMED FOR: TROY DAVIS HOMES `1l4OPROFESS10.0 tr DATE: 4/5/17 PROJECT No.: t‘\N.W��4 PARCEL ID#: TECHNICIAN: J. M I LLE T T E Professional Engineers Stamp: DEPTH TEST HOLE 2 (feet) 1 OB/OG SLOPE SITE PLAN 2 . d 3 ,a SILTY SAND • WITH GRAVEL 4 . . SM/sw 4 5 SEE SITE PLAN Y 6 — V . d 7 ' 8 4. • -- 9 — . a 4 WAS GROUND WATER ENCOUNTERED? NO 1 O-' • IF YES @ WHAT DEPTH'S S v DEPTH OF WATER AFTER MONITORING: 5.0' k 1 1 6 DATE OF MONITORING: 10/II/I7 12 • BOH @ 12' GROSS TIME NET TIME DEPTH OF NET DROP 13— DATE READING (MINUTES) (MINUTES) WATER (INCHES) (INCHES) 14— TEST HOLE PRESOAKED PRIOR TO TESTING: 15 1 16— 2 3 17 4 18 5 19 6 20 PERCOLATION RATE: (MIN/INCH) PERC.HOLE DIA. (INCHES) TEST RUN BETWEEN: FT. and FT. COMMENTS: SOIL MATERIAL IS IDENTICAL TO THI. • MUNICIPALITY OF ANCHORAGE ••wk..t a�Iiii,.. DEVELOPMENT SERVICES DEPARTMENT `•+4p� ..YL..•..,,...•f�1.♦ • �;' a. 4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 s 49th • t. • SOILS LOG - PERCOLATION TEST 1iv1JJ. . 0..MICHAEL E. ANDERSON'; LEGAL DESCRIPTION: LOT 22A, GLACIER VISTA SUBDIVISION ��.� No�:.CE-4381 �(�.' PERFORMED FOR: TROY DAVIS HOMES �44t6 *; .Zi•• DATE: 4/5/17 PROJECT No.: PARCEL ID#: TECHNICIAN: J. M I LLETTE Professional Engineers Stamp: DEPTH TEST HOLE 3 (fes) OB/OG SLOPE SITE PLAN 1 2 — a 3 — a SILTY GRAVEL • WITH SAND 4 . . . GM/GW a 5 SEE SITE PLAN ti • 6 4 . a 77 . 8 —a .a . _ 9 — . $ SILTIER W/DEPTH 1(I WAS GROUND WATER ENCOUNTERED? No IF YES @ WHAT DEPTH? DFWI I I OF WATER AFTER MONITORING: 3.5' 1 1 9 is DATE OF MONITORING: 6/2/17 6.0' — 5/15/17 12 ° DEPTH OF' DATE READING GROSS TIME NET TIME WATER NET DROP 13_x_ (MINUTES) (MINUTES) (INCHES} (INCHES) 14 a • TEST HOLE PRESOAKED PRIOR TO TESTING: 15 • BOH @ 15' 4/5 1 1:14 6.00" 2 1 :44 30 5.00" 1.00" 16 3 1:45 6.00" 17 4 2:15 30 5.00° 1 .00" 18 5 2:16 6.00" 19 6 2:46 30 5.00" 1.00" 20 PERCOLATION RATE: 30 (MIN/INCH) PERC. HOLE DIA. 6" (INCHES) TEST RUN BETWEEN: 5 FT. and 6 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 I /17 117 MUNICIPALITY OF ANCHORAGE ♦+y+,...rr��,, DEVELOPMENT SERVICES DEPARTMENT �� 4700 BRAGAW STREET ANCHORAGE, AK 99519-6650 y 49th V� �� SOILS LOG - PERCOLATION TEST fwLLJ MICHAEL E. ANDERSON ,+: LOT 22A GLACIER VISTA SUBDIVISION • No. CE-4381 .; '••. LEGAL DESCRIPTION: � PERFORMED FOR: TROY DAVIS HOMES 1+4iEt ++++ DATE: 4/5/17 PROJECT No.: PARCEL ID#: TECHNICIAN: J. M ILLETTE Professional Engineers Stamp: I)Ii III TEST HOLE 4 lreti OB/OG SLOPE SITE PLAN 3 a SILTY GRAVEL WITH SAND 4 GM/GW A SEE SITE PLAN 6 — . O 7 8 . d • 9 $ SILTIER W/DEPTH 1 O WAS GROUND WATER ENCOUNTERED'? No IF YES @ WHAT DEPTH? DEPTH OF WATER AFTER MONITORING: 3.5' 1 $ BOH @ 11 DATE OF MONITORING: 6/2/17 6,0' r, .17 12— GROSS TIME NET TIME DEPTH OF NET DROP 13 DATE READING (MINUTES) (MINUTES) WATER (INCHES) (INCHES) 14 TEST HOLE PRESOAKED PRIOR TO TESTING: 15 4/5 1 16 2 3 17 4 18- 19— 6 20 PERCOLATION RATE: (MIN/INCH) PERC. HOLE DIA. 6" (INCHES) TEST RUN BETWEEN: FT. and FT. COMMENTS: SOIL MATERIAL IS IDENTICAL TO TH3. PERCOLATION RATE ESTIMATED AT 30 MINUTES PER INCH. 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 Tills DATE: 4/17/17 ANDERSON ENGINEERING P.O. BOX 240773 ANCHORAGE, AK 99524 522-7773 677-7766 (FAX) October 3, 2017 Municipality of Anchorage Building Safety Division On Site Water and Wastewater Program 4700 Elmore Street Anchorage, AK 99507 Attention: Debbie Wockenfuss Subject: Proposed Glacier Vue Subdivision (S-12357) Water Availability Study Dear Debbie: We have collected information on several wells in the area of the proposed Glacier Vue Subdivision to estimate the possible depths and production rates of wells to be constructed in the future on Lots 21A and 21B. A well was recently constructed on Lot 21B which was the focal point of our study. In addition a well is currently in place on Lot 21A, but no information is available as to the depth or production of the well. It is assumed to be drilled to the same aquifer level as the well on Lot 21B as it is less than 85' from the well. The well on Lot 21 B was constructed without the presence of bedrock below the surface. The well was cased to the bottom of the well. The depth of the well is 182' with a production rate of 7 gallons per minute. It is obvious from our study that the well currently on proposed Lot 21A is sufficient to support a four bedroom home and can be expected to produce between 3 and 4 gallons per minute. The well will not affect the operation or output of the existing wells in the area. �w,�-�s. ;,Atli! 111` OF Sincerely, «�P•' ; ' a r* 49OP=1.t .1 �' '•.f�`wA Y;Y Benjamin Schiller, P.E. I :''4"' t - * •. Attachments �+`' �• '-`O/31'7 4T ,