HomeMy WebLinkAboutHIDEAWAY LAKE Lots 6A & 7A S-5449
MUNICIPALITY OF A.NCHORAGE
DEPARTMEN'F OF HEAl_TH & ENVIRONMENTAL PROTECTION
ENVIRONMENTAL HEALTH CASE REVIEW WORK SHEET
PLATTING BOARD ~ PLANNING & ZONING
CASE NUMBER
S-5449
DATE RECEIVED
August 14, 1980
COMMENTTO PLANNING BY
September 5, ].980
FOR MEETING OF
NAME
Lots 6A,
7A Hideaway Lake Subdivision
CASE OF
~.I'~PUBLIC WATER J~.~A\IAI LABLE TO PE-FITION AREA
L~'"~UBLIC SEWER NOT AVAILABLE TO PETITION AREA
71-014 (Rev. 2/78)
December 3]., 1979
John R. Chewning
Posh Office Box 360
Anchorage, Alaska 99510
Permit ~ 790064
Subject: Lot 7 B[[ock 2 Hideaway Lake Subdivision
A pe2nnit issued by this ~5[epar%ment for well and/or sewer
system has expired.
Permits are issued on ~ calendar year basis, as stated on
the permit, by authority of Municipal ordinance.
If you have drilled the well, a well log should be sent
to this department to document the installation date.
If an engineer has inspected the installation of the
on-site sewer system, please have them send us the as-bui!ts
for our files.
If there are any further questions, ~lease contact this
office at 264-~-4720.
Sincerely,
Les N.
LNB/ljw
eric: Copy of Permit
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.CONSULTING SINEERS AND SURVEYORS
2515 A ST., ANCHORAGE 99503 (907) 276-4245
December 5, 1977
Mr. Bob Sparks
835 "D" Street, Suite 401
Anchorage, Alaska 99501
Re: Proposed Hideaway Lake Subdivision
Sursurface Soil Investigation
Dear Mr. Sparks:
This report presents the results of our soils investigation for the proposed
subdivision of an approximate 25 acre tract located East of Hideaway Lake and
south of Upper O'Malley Road. The investigation was conducted on November 28
to December l, 1977. The results of that investigation are included in this
report as 'Follows:
Vicinity Map
Test Hole Location Sketch
Test Hole Logs (Sheets 1 through 15)
Summary of Laboratory Test Data
Standard Explanatory Information
Drilling was accomplished utilizing a mobile drill B-50 mounted on a flex
track Nodwel vehicle, owned and operated by Denali Drilling, Inc. The test
holes were logged and perculation tests conducted by otlr firm. Harding-Lawson
& Associates performed the laboratory test data on grab samples taken during
the drilling operation.
The purpose of the investigation was to provide sufficient soils 'data for
establishing the feasibility of on-site disposal of sanitary waste using
seepage pits. To accomplish this, we drilled 15 borings.'distributed across
the site as shown on the test hole location sketch. The borings were located
one on each lot at the most probable location of a future septic system.
During the drilling, our engineer was present to log the materials encountered
and to obtain grab samples of the soil types. All soils were ~isually classi-
fied in the field in accordance with the unified soil classification system as
described herein. The grab samples were brought back to the laboratory for
further analysis and verification of the 'Field logs.
In addition to the soil sampling, several perculation tests were conducted.
Based on visual classification of the soil types during the logging of the
test holes, the areas with probable higher perculation rates were identified.
One or more perculation tests were then conducted in each of these areas.
GORDON D. UNWIN, RE.
LEO SCHEBEN, JR.~ E'E.~L.S.
EARL D. KORYNTA~ P.E.
Mr. Bob Sparks
December 5, 1977
Page Two
SITE AND SOIL CONDITIONS
The site is a 990 foot square parcel with an additional 330 foot square parcel
in the southeast corner. Hideaway Lake occupies approximately 5.6 acres of
the northwesterly portion of the site as determined by the lake line meanders.
Drainage enters the lake along the southerly shore line through the proposed
Lot 2, Block 1. Site topography is very irregular, especially in the northerly
half. However, §eneral drainage is toward the lake at an average 12% to 15%
slope. There are no areas within the parcel which slopes in excess of 25%.
The site is primarily underlaying by sands and gravels to the depths ~xplored
(16'). The granular material is well bedded and well graded, with fines
ranging from little or none up to approximately 15%. The surface of the site
is blanketed by an organic mat of forest duff or peat ran§lng in depth from 6
inches to 24 inches. Underlying the organic mat is a layer of fine organic
sandy silt or silty sand (top soil) ranging in depth of up to 3 feet. A very
dense sandy gravelly silt layer located approximately 12 feet to 14 feet below
the surface underlies the southeasterly corner of the site. Apparently this
dense stata prevents further penetration of the surface infiltration. There-
fore, free water was encountered at the time of drilling in test holes l0
through 15 at the interface between the relatively loose surface materials and
this dense strata.
Based on the observed field perculation rates, visual test hole logs and
laboratory test data, on-site sanitary waste disposal systems appear feasible:
Minimum perculation rates for the proposed lots are estimated as follows:
Block l, Lot 1 - 2 min/inch ~]ock 2,~ot_l -~9~2 min/inch
Lot 2 - 2 min/inch ~(measured) ' Lot 2 - 8 '~ i~
Lot 3 - 6 min/inch ...... Lot 3 - 15 ~min/inch
Lot 4 - 2 min/inch Lot 4 -'15 min/inch
Lot 5 - 6 min/inch Lot 5 ~"15r' min/inch
Lot 6 - 6~3 min/inch (measured) Lot 6 ~ 15 min/inch
Lot 7 - 2 min/inch L~ot 7 - 15 mi.o/inch
(measure~)
(measured)
We hope this is sufficient for your present needs. If we Ean offer further
clarifications, pleas~ do not hesitate to contact me.
Attachments
EDK/clr
Very truly yours,
Earl D. Korynta, PoE.
PROdEGT Hidden Lake Subd.
CLIENT Bob Sparks
W.O. 77897
TEST HOLE NO. ll
ELEV. TOP OF HOLE ~'70 ~
DATE 11/29/77
SHEET 11 OF 15
Peat, PT
"Organic, sandy silt, OL
Damp, brownish grey silt, ML
Damp, brown, silty sand, SM
]><~ Grab sample -
~-/ Water table
Wet, sandy silt, ML
Bottom o'f Hole
NOTE:
1. Ground water table at 13.0'.
2. Estimated perculation rate = 15 min/inch. :
19
20
21
22
23
24
25
//
) SOILS
PROJECT"q'H~en' Lake Subd,
CLIENT Bob Sparks
W.O. 77897
SHEET 3
TEST HOLE NO. 3
ELEV. TOP OF HOLE
DATE 11/28/77
-Peat, PT"'
Organic sandy silt, OL
Damp, brown, sandy silt, ML
Damp, brown, gravely silty sand, SM'
Grab sample
Damp, brown silty sand, SM
Bottom of Hole
NOTE:
1. No ground water table at time of drilling.
2. Estimated perculation rate - 6 min/inch
OF 15
Performed For ,/2WY)A? /-'1/i/ ,q,'~ '> !]ated !)erformed,Y:,~ZI.t~._.~z~..~,
Lega I Descri pi:i en: I.ot' .xx: B 1 oc [- Subd i v ~ ' i an .~/~,x~:- x'.4~<~:,~'
This Form Reoorts So~ls, Lo? :../,: ....... x~t.:~_~. .. ~)ercolat'ion Test
Soil Test Flu t 5e r.o,],j~.'. ) ,;' Belnw Pro',}osed Seepage System -
D e p t h
Feet So J Char.aL! nri_, Lit. q
~ , j
lest