HomeMy WebLinkAboutPROSPECT HEIGHTS #3 S-3676
4040 "B" STREET,
ANCHORAGE, ALASKA
PHONE: 007.272.2581
June 13, 1975
W.O. 17342
Bell & Herring
405 W. 27th Avenue
Anchorage, Alaska 99503
Subject: Prospect Heights Soils
Gentlemen:
99503
Transmitted herewith are the test hole logs for the explor-
ation placed at the requested locations.
The data has be~n considered with respect to current Greater
Anchorage Area Borough Department of Environment. Quality
criteria f.or on-site individual sewerage treatment systems.
The data appears as:
I,ocat:Lon sketch
Test Hole Logs
Standard F.>:planator~ Infor]nation
Figure 1
Table A
Sheets 1 to 3
The exploration was accomplished with a track mounted ?-lobile
B-50 drill fitted with /loll. ow and solid stem auger. The
drill was provJ, ded }Dy Denali Drilling, Inc.
The work was supervised by 0.?4. Hatch, senior technician of
our staff.
The test holes were examined by falling head percolation
where tl[e soils appeared questionable. One case, ?est Ilole
#20, was in proximity to an adjacent drainage feature that
caused the hole to fill with water. The soils in that hole
generally were sufficiently dry to indicate the ¥..'ater level
to be a local feature rather t.b. an significant to the general
area.
In general, with the ~oregoing exception, the free water, j.f
any, encountered J.n the exploration, is believed to be
related to the sprJ.~.g thaw and its associated near surface
runoff, and due to the proximity of that cycle to the time.
of this work, .... the exploration may show the more-or-less
wettest conditions.
The soils as described by the Unified Classification, have
been correlated by the Greater Anchorace Area Borough to
have the fol].owir~g appro>:imate Dropertiles.
Bell & Herring
June 13, 1975
Page Two
Unified Class
seepage Area Required
in Square Feet/Bedroom
GW-GP 85
GM 225
SW 125
SP 150
SM 250
ML* 275*
CL_Cti~ 350'~'
* Generally considered to be non-acceptible unless field
percolate.on test shows acceptabl~ rate of flow. The
unified classification is included in the soil des-
cription.
The water table snouid be 4' or more below the system.
In this case, only in.hole #19 is a "water table" reasonably
certain. ~$_~ams' of free water are sometimes encountered in
the several test holes.
We trust the foregoing is sufficient to your i~mnediate
needs, though not necessarily exhaustive of the possi-
.bilities. If we may be of further service, do not hesitate~
to contact the writer.
Very truly yours,
HRL: p f
Attachments
Test Hole 16
Date of Exploration:
Depth in Feet
From To '
0.0' 0.5'
0.5' 2.5'
2.5' 7.0'
7.0'
14.5' 7_qA- '
14.5' 15.0'
15.0' 20.0'
Bottom of Tes~ Nolo:
Frost Line:
Free Water Level:
6/3/75
W.O. 17342
SOIl, DESCRIP'.n]'ON
Brown oeat, damp, soft:, Pt
F-4, brov?n sandy o~ .- '
.......... ........... .:._IL v;.ltn a trace of
gravel, damp, stiff,
F-2, brown ~_L'_a_v_e_l.j.I .?'..!t2.Z ..7_a..n_{[, damp,
medium density, 2"-, f;P.l
F-4, olive qravelly sandy silt, damp,
stiff, ?.]P, 2"-, ML
F-2, brown silty sand, dry, medium
density, SP/SM
F--4, olive gravelly sand}' si]t, damp,
¢'~'~¢ Nrc ] "- St',! to
20.0'
None observed
None observed
~ample
1
2
3
Remarks:
Depth
Type of Sample
5.0 ' Grab
10.0 ' Grab
15.0 ' Grab
Percolation. rate: 6/4/7~ = 7 min./in, or 150 ft. /bedroomS>,/
\~ut most going into sand 'layer at 15.0'
.,ABLF A
Test Hole 18
Date of ]£'xploration:
Depth in Feet
From TO
6/3/75
W.O..'17342
SOIL DES_.RIP:ION
0.0' 1.5'
1.5' 2.5'
2.5' 8.0'
8.0' 16.0'
Bottom of Test Hole:
Brown DCa%, c~am[., soft, Pt
F-4, brown sandy silt with a trace of
travel, damP, stiff, NP, ML
F-2, olJ.ve silty sand with traces of
gravel, wet, medium density, SM
F-2, olive grave!lv silty sand, damp-dry,
medium density, 2"-, SM
16.0'
Frost Line:
TraCe
Free Water Level:
See remarks
Sample Dept~
1 5.0' ~ '
.~rao
2 10.0' Grab
3 15.0' Grab
Type of Sample Other
Remarks:~ .-s~asonal frost residual wetness 2.0' %o 6.0'. perC018t-i~on-i
'rate: 6/4/75 = .10 min./in, or 165 ft'-/bedroom
Test IIole 19
Date of Exploration:
Depth in Feet
Prom To
6/3/75
W.O. 17342
SOIL DF., .RIP.PIO~I
0.0' 1.0'
1.0' 2.0'
2.0' 5.0'
5.0' 12.0'
12.0' 16.0'
Bot-tom of Test Hole:,
Frost Line:
Free Water Level:
Sampie
1
2
3
Remarks:
~gEth _.
5.0' Grab
10.0' Grab
15.0' Grab
Water ].eve]. in hole
Brown peat, damp, soft, Pt
F-4, brown sandv silt, damp, stiff, NP, ML
F-2, brown si].tv ~c_~'ravel].v sand, damp,
medium d.ensity, 3"-, SP/SN to SM
F-l, brown very silty very
damp te wet, medium ~o high density, 3"-, GM
F-2, brown-Co olive ~?avelly silt~ sand,
wet, medium density, 3"-,
16.0'
~rhce
~Spe of Sample Other
ML
Test IIole 20
Exploration Date: . 6/2/75
Depth in Feet
From To
W.O. ].7342
SOIL DE,,CRI] .IO~
0.0' 2.0'
2.0' 4.0'
4.0' 8.0'
8.0' 10.0'
Brown ~_e£~._t and wood, damp, soft, Pt
F-2, brown c3. ravel]y sJ.].tv sand,
damp, medium clensity, 1"-, SH
F-l, brown silty sandy qravel, d.amp to
saturated, medium to high density, 3"-, G~q
F-2, tan gravelly sJ.!tv sand, damp to
wet, medium d. ensity, '2;r-, SM
Bottom of Test Hole: 10.0'
Frost Line:
0.5' to 2.0'
Free water level:
S amp i q D_e_rLt_ h
Type of Samo!e
1 5.0 ' Grab
2 10.0 ' Grab
Remarks: .~Hole filled with water to 2' so cease~--~7!~g~.
(,.~Bote next ~o minor stream. , ......... - ........
e~%~ Ho le 2].
of Exploration:
Depth~in .Feet
From k To
0.0' k 3.0'
/
Brown peat, dr/, soft, Pt
F-~., brown sahdv si!%, with a trace of
gravel, dam.~-wet, stiff, NP, ML
F--2, tan qr.~ve!].V 'very sJ.~t~ ~and,
damp to vre/~, m.o([ium density, 2" S~~
6/2/75
6.0' 13.0'
Bottom of Test Hole: ~[16.0'
Frost Line:
Free Water Level:
Sam~]_~
1
2
3
Depth
2.0'
10.0'
15.0'
F-i, brow,~ silty gravelly sand, damp to
wet, med~Jum density, 2"-, .c;~'!
' ~0 3.0'
/ X
Grab,./
~rab
Gra \
/
/
T~BLE A
Test Hole 2lA
Date of Exploration:
Depth in Feet
From To
613/75
W.O. 17342
SOIL DE.,CRIP :. IO..J
0.0' 1.0'
1.0' 2.0'
2..0' 3.0'
3.0' 7.0'
7.0' 16.0'
Brown peaL, damp, soft, Pt
P-~, brown sandy silt, damp to wet,
soft to stiff, NP
F-2, brown silt~ sand with a trace Of
gravel, damp, medium density, SNI
~FS/F-2, brob~n sand with a trace of silt,
damp, medium density, sP to sP/sM
NFS, brown gravelly sand with a trace of
si!t, dry, medium density, 2"-, SP
16.0'
Bottom of Test Hole:
Pr o~Y--L iii'e: .................. Tr a'c~ ...........
Free Water Level: None observed
Sample
1
2
3
Depth
Type of Sample
5.0' Grab
10.0' Grab
15.0' Grab
/
"ONE TEST IS WORTH A THOUSAND OPINIONS'~
3919 SPENARD ROAD, SUITE A · ANCHORAGE~ ALASKA 99503 · 277-O231
June 18, 1975
Bell, Herring & Associates
Engineers & Land Surveyors
405 West 27th Avenue
Anchorage, Alaska 99503
Attention: Mr. Herring
Re: A Subsurface Soils Investigation in
Prospect Heights Subdivision Addition #2
Gentlemen: --~
As per your request we have performed a subsurface soils
investigation on this Project in order to determine the
suitability of the existing soils for on-site sewage
systems.
Our Company initially excavated four (4) test holes on
this Project in May, 1973. On this subsequent test hole
program we drilled ten (10) test holes with a Mobile B-50
drill mounted on a tracked Nodwell. Grab samples were
taken at each change of soil condition for moisture analysis
and visual classification. The results and locations of
test holes #5 through #15 are enclosed with 'this report.
In general, we encountered silty sandy gravels (GM) and
silty gravelly sands (SM) through out this site. A majority
of the test hole locations were placed in depressions and
swales or at the lowest point adjacent to a proposed home
location. These low areas are generally more poorly
drained than the surrounding terrain, therefore, the
subsurface soils were in a we~ter condition %hah would
be found in adjacent higher slopes. Actual ground water
was encountered only on Lot 5, Block 2. This lot appears
to be in a natural drainage channel. An on-site sewage
system is not recommended for this lot unless the natural
drainage waters are diverted, thereby allowing the sub-
surface soils to properly drain.
Bell, Herring & Associates
6/18/75
Page 2.
The soil types encountered on the remainder of this sub-
division are suitable for on-site sewage systems. We
recommend placing the sewage systems as high on the
slopes as possible for maximum efficiency.
Mechanical analysis tests were performed on the grab
samples taken in test holes #11 and #15 along Schuss
Circle and are enclosed with this report.
If you have any questions, please contact our office.
Very truly yours,
CONSTRUCTION TEST LAB
James D. Mack
Laboratory Manager
JOM/dt
enclosures
Performed for
Legal Description:
This form reports:
Depth
Feet
2-
3 -
4-
5-
6-
Moisture = 8.5%
7- @-7 ft.
8-
~-~ GREATER ANCHORAGE AREA BOROU'~"~
Department of Environmental Quality
3330 "C" Street
Anchorage, Alaska 99503
~O[LS LOG - PEROLATION TEST
Herring & Bell
Lot 1, Block 2
Soils log. Yes
Date Performed
Prospect Heights Subd. Addition #2
Percolation test
6/16/75
Wet 'GravellY Silt (ML)
Gravelly Silty Sand (SM)
10-
!2-
13-
Silty Sandy Gravel (GM)
Moisture = 8.5%
@-12 ft.
14 -
/~ -- Bottom of test hole
Was ground water encountered?
.. I~I0___ If yes, at what depth?
Reading
Date
Gross Time
Net Time
]Depth to Water
Net Drop
Percolation rate minute.
-Proposed installation: Seepage Pit Drain Field
'depth of ~nlet Depth to boctom of pit or Lrench
CO~.II-!E~TS: ..... 2_50 S_q~u~r_e __f~e.e_t_re~uired p~r--bed~JDom ..............
No bedrock or ground water encountered
............... ~James D. Mack LAB
Performed for
Legal Description:
This form reports:
Depth
Feet
2-
3-
4-
5-
Moisture = 5o6%
6-
7-
~' GREATER ANCHORAGE AREA BOROV~'~,
Department of Environmental Quality
3330 "C" Street
Anchorage, Alaska 99503
SOILS LOG - PEROLATION TEST
Herring & Bell Date Performed 6 1~
Lot 2, Block 2 Prospect Heights Sub. Addition ~
Soils log Yes Perc0]ation test '
Gravelly Silt (ML)
Silty Sandy Gravel (GP-GM)
lO-
ll -
!2-
Grey Silty Sandy Gravel
GP-GM
Moisture = 6.6%
13-
]4-
~-- Bottom of test hole
Was
ground water encountered?
~ If yes, at what depth?
Reading Date Gross Time Net Time Depth to Water Net Drop
Percolation rate
· Proposed installation:
~;~,apth of Inle~
minute.
See?age Pit Drain Field
Depth to bottom of [)it 'or trench
Co , ,t TS..__ _ 2_0_0_S_q_u~ar_e~_F~e_~g. _d_r_a_i_n_a~e__ area required R.e.r__b~¢dr_QQ.m_ .....
6~-~ .... ~-N~°-r~-cl, z.!~,~-~k_o_r__ 93CQ.u_nd_ =_~_ake_r .e.,p~gunt ~e_cl_ ............... ~_ ...................
~' ertor~ned uy-_~_~_~=!o_ __..,i'2_-_./~_--~__~,~,.__Ce r t 1 fl ed By :--CONS-TR[ICTION_ '2E,,~T-}TM tO.: _.6/_l. 6.ZYz5
EO-040 ({;/74~ f ames D. Mack LAB
Performed for
legal DescripTion:
This form reports:
Depth
Feet
I -
'/-" GREATER ANCHORAGE AREA BORO:
Department of Environmental Quality
3330 "C" Street
Anchorage, A1 aska 99503
SOILS LOG - PEROLATION TEST
LoS ..5, Block 2
So'ils ]og.. YES
Topsoil
3- Soft-Wet Silt- (ML)
6-
7-
8-
9-
Sandy Gravel
Saturated
(GP-GM)
Date Performed ....
Prospect Heiahf~SA~iD~ ~2
~ Percoration test '
lO
12-
YES
13-
14 -
/5~ Bottom of test hole
Was ground water encountered?
If yes, at what depth? -5 ft.
Reading i Date
Gross Time
Net Time
Depth to Water
Net Drop
Percolation rate minute.
'Proposed installation~ Seepage Pit Drain Field
~3epth of Inlet ............ Depth to bottom of pit or Lrenci~
~-.. ,.~F~ .....................
~0,.h,_,JTS..__Grg_und_wtte~_ encounCe~e~L~-n%~nus-_5 ftc-. ........................
James D. Mack.
e
Performed for
Legal Descrip't~on:
This form reports:
GREATER ANCHORAGE AREA BORO?'~,
~ Department of Environmental qu~iity
3330 "C" Street
Anchorage, Alaska 99503
SOILS LOG - PEROLATION TEST
Herring & Bell
Lot 1, Block 1
Soils log YES
Date Performed
Prospect Heights Subd. Addition #2
Perc0] ati0n test
6/14/75
Depth
Feet
. . 'TOpsuil --'
Wet Brown clayey Silt (ML)
3
4-
5-
6-
7-
8-
9-
II -
12-
13-
Brown Gravel'ly Silty Sand (SM)
(Moisture Content = 10.2%)
Wet
Coarser Silty Sandy Gravel
Wet (GM,SM)
Becoming GW-GM
Below 13 feet Silty Sandy Gravel
Moisture 7.8% @-10 ft.
Moisture 3.2% @-13 ft.
14-
./~,~ Boi-tom of test hole
Was ground water encountered?
NO
If yes, at what depth?
i
Reading Date Gross Time Net Time Depth to Water
Percolation rate
· Proposed installation:
:)epth of Inlet
mi nute.
Seepage Pit
Drain Field
Net Drop
COMMENTS: .___2~2_5 _Equa_r_e__ _fge_ ~_ _d_r~ .in_a_g~__ ~_r_e_a_~agui
Performed F~y: _/~./,'__~.~3<_~., ~-_~_/~.~__~Certified By:
................. --~/'- ~lam~ -bl- -i~I~ ~5~ .....
Depth to bottom of pit or trench
GREATER ANCHORAGE AREA BOROL'~'~'',
Department of Environmental Qu~,ity
3330 "C" Street
Anchorage, Alaska 99503
Performed for
Legal Description:
This form reports:
Depth
Feet
i
SO[LS LOG -PEROLATION TEST
Herring & Bell
Lot 2, Block 1
Soils log. YES
3-
4-
5
6-
7-
8-
9-
Silt (ML) Wet
Silty Sandy Gravel
(GM) Moist
Moisture = 13.7% @-5 ft.
Moisture = 5.3% @-10 ft.
II -
12-
14-
//~-- Bottom of test hole
Was ground water encountered?
Wet from -11 to 13 ft.
Becoming Sandier below 11 ft.
NO
Date Performed 6/14/.7.5
Prospect Heiqhts Subd. Addition ~
Percolation test
If yes, at what depth?
Reading
Date Gross Time
Percolation rate
-Proposed installation:
mi nute.
Seepage Pit
Net Time
Depth to Water Net Drop
Drain Field
;)cpth of Inlet Depth to bottom of
[~O;'II'.~[~ITS: ..... _2_2_5_~__~t~_a_-~_~--~ drainage area required pe_r
No~edrock or ground wa~er encountered
/James D. Mack
EQ-040 (6/74)
Performed for
Legal Description:
This form reports:
~-'" GREATER ANCHORAGE AREA BOROL
Department of Environmental Quality
3330 "C" Street
Anchorage, Alaska 99503
SOILS LOG - PEROLATION TEST.
Herring & Bell
Lot 3, Block 1
Date Performed 6/14/75
Prospect Heights Subd. Addition #2
Soils to9 YES
Percolation test
Depth
Feet
1 -
2 -- Organic Overburden
Silty Gravelly Sand (SM)
Moisture = 9.2%'
Coarse Silty Sandy Gravel
(GM)
Wet to Saturated below
minus 10 feet.
!2,
13-
Silty Gravelly Sand
Moist to Wet
(SM)
14-
'WS/?a-- Bottom of test hole
ground water encountered?
If yes, at what depth?
Reading
Date
Gross Time
Net Time
Depth to Water
Net Drop
.............. _N_~__b_ej~_. _o_c__k. _ _o~__qr_o u_n_d_ __w_a_t.e..~.¢]3.caurLte]:.ecl_ ................
?erformed By:_ .~/_//_~:~_~.~.__~3/_~_~__Cert]fied By:cQNST~_TES~_.LAB
Percolation rate minute.
-Proposed installation: Seepage Pit Drain Field .......................
~ ~,1 of Inlet Depti~ to bottom of pit or trench ........................
COMFIE[~TS: ___2.5_O__S_qu_a_r_e__ _f.e_e_t__ _d_r_a_i_.n__a_E[~__area .r_e__q_llir_ed__per_J~e_dr.coan .................
Performed for
Legal Descript'ion:
This form reports:
Depth
Feet
Topsoil
/-'" GREATER ANCHORAGE AREA
Department of Environmental Qu~,ity
3330 "C" Street
Anchorage, Alaska 99503
SOILS LOG - PEROLA'FION TEST
Herring & Bell
Lot 4~ Block .1
Soi 1.s' ']-o'g YES
(SM)
Gravelly Silty Sand
MOisture = 11.3% @-7 ft.
Date Performed 6/14/75
Prospect HeiohJ~bd. Add~iJ~i_on ~2
Perco]-ation test
9- Moisture = 13.0% @-9 ft.
l0- (Wet to Saturated)
II -
12-
13-
Bottom of test hole
Was ground water encountered?
YES
If yes, at what depth? -12 feet
Reading
Date
Percolation rate
Gross Time
minute.
Net
Net Drop
-PropOsed installation: Seepage Pit Drain Field .........................
'.)epti~ of Inlet Depth to bottom of pit or trench ......................
C01 l[ lENTS: . _SaJzur~e_d _ soil s_ ~nu s _ 1 2 -f~~dr~en~n~6~ed-
250 s~uare feet drainage area required~er bedroom
EO--040 (li/741 James D. Mack
Performed for
Legal Descrip'~'ion:
This form reports:
:-" GREATER ANCHORAGE AREA BORO['/~,
Department of Environmental Quality
3330 "C" Street
Anchorage, Alaska 99503
SOILS LOG - PEROLATION TEST
Herrinq & Bell
Lot 6z Block 1
Soils log. YES
Depth
Feet
Dry Gravelly Silt (~LL)
3
4 - Dry Sandy Silty Gravel (GM)
5- M°is~ure : 922% @-5 ft.
6- Moisture = 12.1% @-7 ft.
Moisture = 12.4% @-9 ft.
Becoming Gravelly Silty Sand
Below 6 feet.
l0 - Wet between 8 & 10 feet ohly
II
12-
Silty Gravelly Sand (SM)
13-
Date Performed 6/14/75
Prospect Heiqhts Subd. Addition ~2
Percolation test
14-
Bottom of test hole
Was ground water encountered?
NO
If yes, at what depth?
Reading
Da te
Gross Time
Net Time
tDepth to Water Her Drop
Percolation rate minute.
-Proposed installation: Seepage P~t Drain Field ......................
~]~>th of Inlet . Deptl~--to bottom of pit or ~rench ......................
~ '~ :"" ---~'2-5--~i~6 feet drainage area required per bedroom
CO~, ;L~TS.. ................. _ ..................................
~NO bedrock or ground water
............... -~--~a~-I~'-~ack .......
/-~' GREATER ANCHORAGE AREA BORO[ ~
Department of Environmental Quality
3330 "C" Street
Anchorage, Alaska 99503
SOILS LOG - PEROLATION TEST
Performed for Herring & Bell
Legal Description: .
This form reports:
Date Perforated
Lot 7, Block. t Prospect Heiqhts Subd_, .Add__it__ion fL2
Soils log YES Percolation test
6/,14/75
Depth
Feet
] - Topsoil
2 - -Wet Gravelly Sandy Silts (ML)
6-
7-
8-
Silty Sandy Gravels
Moist to Wet (GM-GP)
10-
Saturated between 10 and 12 ft on~l/~e
12~
13-
Silty Gravelly Sands (SM)
14 -
7~--- Bottom of test hole
'~Tas ground water encountered? NO
If yes, at what depth?
Reading
Da te
Percolation rate
Gross Time
minute.
Net Time
Depth to Water
Net Drop
-Proposed installation: Seepage Pit Drain Field
~)epth of Inlet Depth to bottom of [)it or ~rench
COt-li'.!ENTS: .... _22__5___Sfhu~r~_e_.f_e__e_t. ~_r_a_._i_n_a~e_ area required pe__r
No bedrock or ground water encounterD_~d ........................................
'~- ~-'~--- -~;-'- W7 ..... ='~ ..................................