HomeMy WebLinkAboutLot 125A, 125B
MUNICIPALITY OF ANCHORAGE
DEPARTMENT OF HEALTH & ENVIRONMENTAL PROTECTION
Environmental Health Division
CASE REVIEW WORKSHEET
CASE NUMBER: DATE RECEIVED: COMMENTS DUE BY:
S-7758 July 2, 1984 July 20, 1984
SUBDIVISION OR PROJECT TITLE:
COMMENTS:
- .' ....... : ...... S 7..7 5 8"Ju'~. '~ s i984',' '~
PRELIMINARY
SOIL REPORT
FOR
LOTS 125A & 125B RUSS HARMON S/D
SECTION 9 T15N RIW
PREPARED BY:
DOWLING & ASSOCIATES
804 E. 15th
ANCHORAGE, AK'99501
JOB NO. 83-1010
MAY 17, 1984
INTRODUCTION
This report documents a preliminary soil investigation conducted at BLM Lot
125 Section 9 T15N RIW. The field investigation was oerformed on May 15, 1984 under
the supervision of Bill McClintock, Engineering Geologist.
Three Backhoe trenches were excavated at selected locations on the property by
the owner Russ Harmon and another hole where a Perk Test was completed by S&S
Engineers, using a John Deere 450C backhoe.
SITE DESCRIPTION
This 5 acre parcel is located off Birchwood Loop Road and near Jayhawk Drive
in Peters Creek. The subdivision is located on the westerly slopes of Peter Creek.
It is covered with a good stand of Birch and Spruce. There is a buitdin§ on the
NW corner of the tot with an existing well and septic system. The roaa (existing)
serves the building at the NW corner from the west and a newly constructed road
(Helluva Street) has been constructed from Jayhawk Drive.
GEOLOGY
Three test holes were dug. The two on thin, north (TH2 & TH3) showed big rock__s
~at'6.5 feet and 4 feet respectively. Although the oossibility exit1
seotic's'~stems in ~ither location; test hole #1 shows good GM materials to 9.5
feet and essentially a good location for a seo~ic system, with a small amount of
overburden over~$ilty sandy gravels. Visual i~soec~on would reflect moderate rate
of percolation. (See subsequent test in general area by S&S ~ngineers/test hole
included in this report~')
CONCLUSION
The tests seem to ~pdicat~,th~t.~on%,site ~ater a~d septage disposal wou'ld
o~smno problem within ~ne sOUthern'9 portion 6f the newl.v formed Lot. Recommend
t~at Departme~Of Health and Environmental Protection approval be acquired Prior
to use of both water wel! and septic disposal s.¥stem.
/
/
PERFORMED FOR:
LEGAL DESCRIPTION:
MUNICIPALITY OF ANCHORAG~ ,~ PERCOLATION
DEPARTMENT C F HEALTH AND ENVIRONMENTAL PRO'! ECTION TEST
825 L. Street, Anchorage, Alaska 99501 264-4720
SOILS LOG -- PERCOI~AT ON TEST
~.07- /' 7~ / SLOPE / SITE PLAN
WAS GROUND WATER
ENCOUNTEF] ED?
IF YES, AT WHAT
DEPTH?
14
15-
16
17
18
19-
20-
Gross Depth to . Net.
Date Time Time Water Drop
TEST RUN BE~EEN FT ~ FT
COMMENTS
SOILS LOG
MUNICIPALITY OF ANCHORAGE
DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION
825 L. Street, Anchorage, Alaska 99501 264-4720
SOILS LOG -- PERCOLATION TEST /
[] PERCOLATION
DATE P RFORMED:
LEGAL DESCRIPTION:
1
2
3
4
5-
7
8
10
11
12
13
14
15
16
17
18
19
20
SLOPE
E
YES, AT W~AT
Net Depth to Net
Reading Time W, ater Drop
PERCOLATION RATE
[minutes/inch)
FT AND -- FT
/
CERTIFIED BY:
PERFORMED FOR:
LEGAL DESCRIPTION;
1
2
3
4
5
6
9
10
11
12
13
'14
15
16
17-
18-
20-
MUNICIPALITY OF ANCHORAGE
DEPARTMENT OF HEALTH'AND ENVIRONMENTAL PROTECTION
825 L. Street, Anchorage, Alaska 99501 264~,720
SOILS LOG - PERCOLATION TEST
DEPTH?
[] PERCOLATION
/
DATE PERFORfO:
Tfs',q.. IZ .X
SLOPE SITE PL~
f
Reading · D Time Water Drop
- PERCOLATION RATE
(minutes/inch)
TEST RUN BETWEEN . PT AND . FT ~/~/
.%.
PERFORMED FOR:
LEGAL DESCRIPTION:
10-
11
12-
13-
'14 -
15-
16-
17-
18-
20-
MUNICIPALITY OF ANCHORAGE
DEPARTMENT OF HEALTH AND ENVIRONMENTAL PROTECTION
825 L. Street. Anchorage, Alaska 99501 264-4720
SOILS LOG -- PERCOLATION TEST
PERCOLATION
TEST
SLOPE SITE PLAN
I
Il
ENOOUNTER, Nn ][
O
P
=
IF YES. ATIf ~AT'
DEPTH?
PERCOLATION RATE
TEST RUN BETWEEN
COMMENTS 7-~___~
PERFORMED BY: ~,'ff
(minutes/inch)
. F~ AND FT
CERTIFIED BY:
L.)L:I'Alt'JM~.N ~ u, I I L~,~,/~T%H & 'ENVIR. ONMENTAL PROTECT~,N · PR,. ,'NSPECTION CHECK SHEET .
'":~'"" ". ~'."'; !. TYP CAL: TRENC?i '
'~'""' ON' LEVE ~ TOPOGRAPHY
264-4720
'INDIVIDUAL
TO TANK 100'
MINIMUM WELL ' ' CLASS A, B
DISTANCES: PUBLIC Over 25
Service or More
Than 15 Connects
TO TANK 200'
TO TRENC~ 200'
CLASS C
PUBLIC - Under 2
Service or Less
Than 15 Connects
TO TANK 150'
TO TRENCH 150'
TO TRENCH 100'
i~i., ,, plat. Adequate engineering
Minimum 5' ¢ast iron are requi~ed
into:undisturbed soil(4"
4" CAST. LRON CLEANOUT
./' ;.'-;',, CLEANOUT WITH ART OHT CAP
ALL CLEANOUTS MUST COME AT..
LEAST TO GROUND LEVEL ~l :
PERFORATED PIPE INSTALLED LEVEL'[D '
Public wells must have dedicated
protective radius-recorded on the S/
plans
pipe)
Plastic Pipe ASTM D3034 may be used
in place of the cast iron.
MINIMUM
2x gravel depth
Perforated Pipe
(Perforations
olid Pipe
with cap
Perforated
Pipe
SEEPAGE TRENCH INSTALLED ACCORDING
TO..SO,~ T.EST 0. ~:,: ;! '? '.:,; ::" '~
· SEPTIC TANK MUNI ClPALiT)' APPROVED r,
INLET AN0 ~UTLET OF ~EPTIC TANK
WATERTIGHT Q
TRENCHIINSTALLED ' t'~
ACROSS SLOPE ' ':'
PER~'OR~TED PIPE LEVEL
LINE BETWEEN",TANK:~.ND; '-,
HOUSE 2% .~o.'6% SLOPE
00' MINIM JM FROM TANK
AND TRENCH TO RIVE~,
Bottom of seepage trench 4' Excavation to -
Minimum above water table lot line
· And 6' minimum above bedrock ( )
RAKE SIDEWALLS 8EFOREINSTALLING GRAVEL ~
· , , ,,, .,,,,, , , .... ...:--'"'"',.'$ ;.;. ;,;.'
,u LO .~, ,~,,. ~ ' ........ ~"..'.!?'~'
· . :: ' . ,.~. .~:-. ','..~,~
... · , ~. ,~\~ ,.',,., .
..... ~.~.
. . .... .~. :.,~,..~i?~ .~5..: ~'
, , PERFQRATEO~ ,. ', o,-,,
= 4'- :'.~.' , ,~ ~.'
SCREENED GRAVEL ~ ....
~ ~ ., ~~'.'~.' ..,.
.: ..~;~,: .;ji. ,: /i:.: ~ .i, (.. , : .:' ,,' .'. !.... ~.RE,.INSPECTION CHECK SHEETq
HOUSE ,: ,
n
LEVEL
5' CAST IRON INTO
UNDISTURBED SOIL
~,STIRON REQUIRED WHENEVER LINE
CROSSES UNDER DRIVEWAY []
4" CAST IRON SIPHON
PiPE WITH AIRTIGHT
CAPS []
Crib' or Log
o o ' ;.:,.
O O ' ...'.
o oI
GRAVEL BACKFILL []
CRIB 4' MINIMUM ABOVE WATER TABLE []
6',V NIMUMABOVEBEgROCK[]
MINiMUM,WELL DISTANCES:
mO PIT :~ O0".n
NE. O a ,,'
u,,do';-
, Or Less
ThanhlS; ConneCts ,
mO TANK i00 -(.)
TO PIT · 150
h~'??' 75'-~00 '. O~LY CaST
';<;~,"IRON 'SEWER LINE
:!~"?'PUBLIC 7, Over 25, j
--Service:or Hore
"~'-::u;TO TANK 200
"':~00';200' DULY
'; CAST;IRON SEWER
, LINE. ' "~
-~oo ,.'?~o souRCE'
."~ 'NOTE'. '~ 0b ~Ia Z~U>~'
'"~';:m.:;FROM' TANK ,AND ~IT
% RIVER, LAKE, OR
' ' ' Individu
4"SEWER LINE []
CONSIDER OlSTANCETO AREA WELLS & SEWER SYSTEMS
PiT EXCAVATION BASED (~N SOIL TEST []
.. :,SEPTICTANKMUNICPALITYAPPR~VED[] . :' ./
· , ' OUS
//
INLET & OUTLET MUST
BE WATERTIGHT
\
TANK L '
, CRIB
'; '~.V.' ,' ~ .:' '..
SEEPAQE
PIT
GRAOE: 2'~ER ldo
V," PER FOOT EXCE
PRECEEOIND TAN'~
SHOULO NOT EXC[
6" PER 100' 0i
TER RAINS ID
SCREENED GRAVEL
½' 2%"
20' MINIMUM TO NEAREST LOT LINE
; cLdon of a aborato:/y*tcst ng procedure ff Ihe log ~c udes soils utopias. / ~ : *- ~'r :*' an
' ~ : obmrva onorsamp ne' .' -,' . ~, ' r: ' " ' ~ : "2 '" ' ' ' ' ' '
, · : ' " · ' ~' - 2 ~ ~' ?'~" ]:'.~: 2' "' 3' ~ . ~ " Organ C Cfntent -- usually descr bed as Pear ~ sometimes includes
prop~;rtion~'are appt~ximale'a[~dl'm~ificationl tO the Ifil group due to Muck - a modifier u~d tn d.cnbe very son, sem1.orgamc deposits
sttatifi~atloi~ inch ' below ~ peat dcpostt. . .
~ organlc pardcIe~ nearly or fully disint~rated.
sea, hal frost depth ~s degribed by drilli~ ~ctlon and/or
-- ~h~ time of drilling.
~mund'- ocher than fiost llne. described by ~mpZe~, usually
ption of ice content, often will include modified Unified
Classification for (rosen ~ils -this is ~ special ca~e re,ted
Level -- The free water'le{el rioted durifig drilling. This
soils requires observation wells or p~ometer instulladoni, used only ut
:,,.,': ~1: tube 3'~.'auger ) 2'1; ~u~er fl r. of blows o~ a'J 40'~e~ht free falling 30" to
-- ' ~ (~50 hollow ~tem 6%8~, Largo particle~ age 8olctlbed ind~ectl split ~poon 6"~ the number ofblow~ for a 12" zdwnce
' :.~:,act~on of th~ dr~bng and ate t~fetted to a~ cobblg~1 3.,to 8 t.or ],,bydefinitjon. the~tandatd. . - , penetration.
'.;.' ~, bould.s 8"+ Therefore whcu rcyi~win8 the gradation shcets,.if any, (~-. : .: ,. : · ,
il'. ': the desctiptlofi.~n thc,bole log mu~ be ~6nsideted for affindfcation of~ ':~,d% ~- natural moisture content of the soil ~mple, usually not
% Unified'Soil' Cla.ifi~atiun.'[~*~This'ls ,:tWo letter ~ode,'See Umfied ~le ~
' Classification ~heet for f~th.'d~finition,'~ l&,some ca~s AASHO and/or' '~, to 2" spl~t spoon driven into the soil by 140 pound
FAA ~o c as~ fica~ one may be shown as ~cll as ~he unified, . weight a disturbed sample,
.,, · , .' ,~ ,''-;'; ' ' , :¥., '~' ~,'::/'-:. ~ thin wall tube "Shelbyt~u~ toobtain und~turbed samples
-., ~. :' ' .' ' : ' ' ~; ~ '~ grab disturbedsampleftoma~erfllghtsorwallo~trench.
P na ~a mo s ute conte~t ~e erred le be la. ha~ ~b~dc ~mit. :' ?.: h: '~; ':g:~'~? ~ cut ~mple undi~t~bed s~mple from wail of trench.
, P~' ~a n o~ ~e co~te~'. ~ bt ~d io b~ between pb~t ¢, an~' qu~,,~ ':: ;~"~y, _ Stre~8_ - a ~ful indicator of a ~il's cbyey ~r~ct~on.
"L~* ~';t~a ~mo~ ~ ~onten bg~d o'be l~eag~r than J~uid [ mit 't ]" :~ Gtou~ r The umpire ate,-p aced ntu apparently s~mflar groups ba~d
~ . ;' i ~ '~'~: · ~ .: ;% 3%- . . ~: []~' . ';..; ,: /' , c2 ~.,30 co O~ a~d Iextu~e and arc arbitrarily assigned a group letter. Further
SOIL:'
CLAS$1FICATI6N
CHART
GRAVEb
70 80 90 ' 100
';';~: ,..~'~: BY.WEIGHT
NONFROST SUSCEPTIBLE SOILS ARE INORGANIC SOILS CONTAINING LESS THAN 3% FINER THAN 0,02 mm,
· ,u, GROUP5OF FROST-SUSCEPTIBLE SOILS: , .
GRAVELLY 5OIL5 CONTA N NG BETWEEN 3 AND 20% FINER THAN 0,02 'mm.
~,NDY 5OIL ~TAINING BETWEEN 3 AND ! 5% FINER THAN 0.02 mm. ; ,.
;5 CONTAINING MORF THAN ~'0% FINER THAN a,02 mm, AND SANDY 5OILS
i.['- ("XCEPT FINE SILTY,,SAND5} CONTAINING MORE THAN 15% FINER TILIAN 0.02 mm,
b,' CLAYS W TH PLASTICITY' NDEXES OF MORE THAN 12 'EXCEPT VARVED CLAYS
'a~i'AL~L'SIL;TS'INCI~UDING SANDY SILT~. , (.. , ; ' '! '." :.~--: · .;['.. ·
ILT~' SANDS CONTAINING MOR~ THAN 15,~'FINERTHAN 0.02 mm. ::';i; '" '~:
CL~AVS WITH ' CITY INDEXES OF LEss THAN 12, : ' ' '
· ~ ~f~y C H E C K L I S T
~ onedx ;' Ddt ~--~
WASTEWATER DISPOSAL
Public Sewer Community Onsite Sewer
Soil tests stamped by engineer, signed, dated, iden~if~ad, etc.;
/~_~_~ Sufficient soil tests to characterize minimum of 50% of subdivision
/ / w z in probable absorption field areas;
~ Soil test locations accurately identified;
f//gz~ Parc test data adequate;
// ~)- Groundwater monitored for 90 daysl With i~st month 0ccur~ing
tf ~ between June 1 and October 15;
t ~ Accurate topographic map;
y Slope <25% in general region of original and replacement sites;
D.E.C. approval of community system plans (if applicable);
Bedrock outcroppings or shallow depth to bedrock;
Sufficient setback from creeks, major drainages, other water bodies;
Sufficient setback from cutbank or bluff;
~ Sufficient setback from probable private well locations;
Sufficient setback from community well(s);
Sufficient setback from curtain drains;
- Curtain drains installed and ground water monitoring results shown;
- Thorough site visit (walk-through) completed;
_.~ Minimum proposed lot size meets with DHEP and Zoning criteria;
One original plus two replacement sites delineated for each lot,
while maintaining all separation distances between replacement
sites, property lines, water supplies, water bodies, probable
building structure location, cutbanks, bluffs, etc., and in areas
having less than 25% slope;
WATER SUPPLY
Public Water
Community Water
~family Wells
D.E.C. approval of community water supply;
Known water supply problems in the area;
Water rights applied for from DNR for community wells;
Meets all separation distances;
Sources of contamination identified (dumps, chemical storage sites,
etc.;
Adequate water supply and acceptable water quality;
Review conducte~~w ~//
KB5/ej/D18
Date
VI $1 N
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01
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