HomeMy WebLinkAboutALYESKA BASIN #7B Lots 2A & 2B S-11729Alyeska Bcisin7B
Lots 2A & 2B
5-11729
FLATTOP TECHNICAL SERVICES
TED MOORE, P.E.
PH./FAX: (907)345-1355
E-Mail: tgmoore~ci.net
CML & ENVIRONMENTAL ENGINEERING * ENERGY CONSERVATION & ANALYSIS
14530 ECHO CANYON ROAD
ANCHORAGE, AK 995'16
November 4, 2009
Deb Wockenfuss
M.O.A. DSD
On-Site Water and Wastewater Program
P.O. Box 196650
Anchorage, AK 99519-6650
Dear Ms. Wockenfuss:
This is in response to your 10/20/09 comment sheet to Anthony Hoffinan regarding a proposed
subdivision of Lot 2, Alyeska Basin, Unit 7B. The proposed Lot 2B will be served by public water and
sewer and the suitability of the residual Lot 2A for on-site water and wastewater is unchanged from its
suitability at the time of original approval of Lot 2 back in 2004. Nevertheless, my responses to your
comments (in blue) are as follows:
1. Ground water monitoring must be conducted during high ground water season in either the fall (October) or
spring(May). See attached soils logs for results of additional groundwater monitoring conducted
in October.
2. Areas designated for the original and replacement wastewater disposal system sites must be identified and must
meet all criteria specified in AMC 15.65 including slope and slope setback requirements for each lot. See
site plan for designated 10,000 sq. ft. wastewater disposal area on Lot 2A. Lot 2B will be served
by AWWU
3. It appeurs that the wastewater disposal sites may be within 50' of excessive slopes. My field measurements
indicated that the designated disposal si~tes are not within 50 feet of excessive slopes.
4. Show all easements. See revised site plan.
5. Provide documentation for water availability to serve water wells. See attached copies of previously
submitted well logs documenting water availability in the subdivision area.
Please call me at 345-1355 if you have further questions.
Sincerely,
Ted Moore, P.E.
cc: Ralph Brodin
17
LOT 2B
LOT 1
LOT 3 '
/
/
10,OOO8Q. FT.
,,~
AREA
,,
LOT 2, ALYESKA BASIN S/D, UNIT 7B
SEPTIC SYSTEM FEASIBILITY
~ITF: PLAN
FLATTOP TECHNICAL SERVICES 1 INCH = 100 FEET
14530 ECHO CANYON ROAD DRAWN BY TFM
ANCHORAGE, AK 99516 REV. NOV., 2009
NOTE: THIS IS NOT A SURVEYED PLAT.
ALL LOCATIONS SHOWN ARE APPROXIMATE.
ITEST HOLE
FLATTOP TECHNICAL SERVICES
14530 ECHO ST.
ANCHORAGE, ALASKA 99516
SOILS LOG -- PERCOLATION TEST
LEGAL DESCRIPTION: '
DATE PERFORMED: A.ndl .cl. 2003
PERFORMED FOR: Tom Skillir!g c/o Ra ph Brodin EE/CC
DEPTH
(f~t)
SM Reddish sandy loam
SP/GP Clean, black gravelly sand
Increasing sand fraction w. depth
SLOPE
Depth to Groundwater Date
NO groundwater 4/9/03
Monitor tube dry 4/16/03
Monitor tube dfi/ _ 10/27/09
¸LO
SiTE PLAN
SEE SEPARATE
SITE PLAN
Date Reading Clock Net Time Percometer Net Drop
Time (minutes) Reading (inches)
4/9 5d:latlon presoak 1:28:00 24
#1 1:29:00 I 19 3/8 4 5/8
__ ~- 1:29:45 0.75 17 112 Drv
COMMENTS:
material should avoid the necessity_ to install an imported sand fleer.
PERFORMED BY FLAYFOP TECHN,CAL SERV, CES. I .~..~ ~'~..~.-~
ACCORDANCE WITH ALL STATE AND MUNIO,PAL GUIDELINES iN EFFECT ON THIS DATE.
PERCOLATION RATE <<1 (minutes/inch) PERC HOLE DIAMETER
TEST RUN BETWEEN 4.0 FT AND 4.5 FT
Excellent material for construcSon of on-site wastewatar disposal system. Despite_rapid perc rate, sand contant of native
CERTIFY THAT THIS TEST WAS PERFORMED iN
DATE: /J /~.,~/~',~
ITEST HOLE#
LEGAL DESCRIPTION:
DATE PERFORMED:
PERFORMED FOR:~
DEPTH
(feet)
4-__
B.H,
COMMENTS:
FLATTOP TECHNICAL SERVICES
14530 ECHO ST.
ANCHORAGE, ALASKA 99516
SOILS LOG -- PERCOLATION TEST
L~n S/D #8
ApdLg: 2003
Tom Skilling c/o Ralph Brodin EEJCC
Pt.
SM Reddish sandy loam
SP/GP Clean, black gravelly sand
Sand similar to test hole #1
Fewer cobbles and beuldem
SLOPE
25%
SITE PLAN
SEE SEPARATE
SITE PLAN
Depth to Groundwater Date
-No groundwater J 4/9/03
Monitor tube dry 4/16/03
tonitor tube dry 10/27/09
Date Reading Clock Net Time Percometer Net Drop
__ Time (minutes) Reading (inches)
PERCOLATION RATE (minutes/inch) PERC HOLE DIAMETER
TEST RUN BETWEEN _ FT AND FT
Excellent material for construction of on-site wastewater disposal system, See log of TH~I for perc test.
PERFORMED BY FLATI'OP TECHNICAL SERVICES. I ~"-~-~ ~ CERTIFY THAT THIS TEST WAS PERFORMED IN
ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: /l/.,~ ,/~' ~
TEST HOLE
FLATTOP TECHNICAL SERVICES
14530 ECHO ST.
ANCHORAGE, ALASKA 99516
SOILS LOG -- PERCOLATION TEST
LEGAL DESCRIPTION: Lot 3. Alyeska~3_sin S/D #8
DATE PERFORMED:
PERFORMED FOR:_ Tom Skilling c/o Ralph Brodin EE/CC _
DEPTH
(feet) Pt.
1-
GMBrown silty gravel
Some boulders
Water seep
ML Brown Silt
Many boulders
ML Blueish silt
Many boulders
Very hard digging
SLOPE
SiTE PLAN
SEE SEPARATE
SITE PLAN
11
13-
14 I
17-
18-
19
201
COMMENTS:
tLOI ~E
Depth to Groundwater Date
Seeps ¢,, 3' 4/9/03
Clock ! NetTime / Pemometer ! NetDrop
Date Reading Time (minutes) Reading (inches)
PERCOLATION RATE~ (minutes/inch) PERC HOLE DIAMETER
TEST RUN BETWEEN __ FT AND __ FT
Soil unsuitable for construction of on-site wastewater disposal system. Mo monitor tube installed in test hole.
PERFORMED BY FLATTOP TECHNICAL SERVICES. I~.z~~ "~,"~-,,~__ CERTIFY THAT THIS TEST WAS PERFORMED IN
ACCORDANCE WITH ALL STATE AND MUNICIPAL GUIDELINES IN EFFECT ON THIS DATE. DATE: ~//! f ~-.~