HomeMy WebLinkAboutENGLISH RANCH SOUTH - PUD- PRELIMINARY AND FINAL - 75-86V - CORRESPONDENCE - SITE PLAN r
Irerracon
CONSULTANTS WESTERN,INC.
P.O.Box 503•301 N.Bowes
Fort Collins.Colorado 80522
(970)484.0359 Fax:(970)484.0454
February 21, 1997 Larry G.O'Dell,RE.
William J.Attwool,P.E.
Neil R.Sherrod,C.P.G.
Bartran Homes
P. O. Box 277
Timnath, Colorado 80547
Re: Amendment to Geotechnical Engineering Report
English Ranch South PUD, Phase II and Future Phase III
Fort Collins, Colorado
Project No. 20955134
Gentlemen:
To meet the criteria of the new City of Fort Collins Engineering Department "Requirements for
Design Criteria and Standards for Streets" dated March 19, 1996, Terracon Consultants Western,
Inc. hereby presents this amendment to our Geotechnical Engineering Report prepared for the site
dated August 17, 1995. Empire Laboratories, Inc., our predecessor firm, prepared a "Report of a
Geotechnical Investigation"for English Ranch in September 1986 which is located to the north edge
of the site. We have included herein a Vicinity Map showing the project area and a new Site Plan
showing the proposed streets, lots and the appropriate previous boring locations. Additional
information regarding drainage and groundwater as required by the new regulations is presented
below.
The site is currently a cultivated farm field vegetated in alfalfa stubble. An irrigation lateral runs
along the west and north portions of the site. The area is relatively flat and has minor drainage to
the east. The area is bordered on the north by English Ranch, on the west by Sunstone PUD, on
the east by English Ranch South Phase I, currently under construction, and on the south by farm
land.
With respect to the drainage patterns on the site, major drainage is to the southeast to the detention
ponds that have been excavated in the southeast corner of the Phase I site. Storm drains in the
streets will also carry storm water to the detention ponds. We understand that a drainage plan is
being prepared for the site by Stewart and Associates, Inc. According to Stewart, the site does not
lie within the 100 year flood plain of any stream or drainage. With respect to irrigation ditches, a
small lateral is located along the west and north edges of the site. The irrigation lateral will be
placed into a pipe and connect to the existing pipe constructed along the north edge of Phase I.
In 1996, groundwater was encountered over the west and west-central portions of the site at depths
of 11'/z to 14 feet. Free groundwater was not encountered to a depth of 15 feet in the east-central
portion of the project area. Groundwater was encountered along the north edge of the site in 1986
at depths of 7'/2 to 9 feet when Borings 12, 13, and 14 were drilled. However, at that time, the site
was entirely farmland and had been flood irrigated. The 1996 water readings indicate water levels
have lowered at the site. Groundwater levels can be expected to change with varying seasonal and
weather conditions. Moisture contents at the site in 1996 indicate that water levels should not rise
Offices of The Terracon Companies,Inc. Geotechnical,Environmental and Materials Engineers
Arizona ■ Arkansas ■ Colorado III Idaho ■ Illinois ■ Iowa ■ Kansas ■ Minnesota
Missouri ■ Montana ■ Nebraska ■ Nevada ■ Oklahoma ■ Tennessee • Texas ■ Utah ■ Wyoming
QUALITY ENGINEERING SINCE 1966
Bartran Homes, Inc.
Page 2
Project No. 20955134
more than two to three feet above 1996 levels due to seasonal variations except in the northwestern
portion of the site where moisture contents indicate water levels may rise as high as 4 to 5 feet
above 1996 levels.
It is our understanding from Stewart and Associates, Inc. that the grading plan will provide for minor
cuts and fills of one foot or less. This will provide at least three feet between the existing
groundwater and the street subgrade. Therefore in our opinion, area subdrains will not be required
for the project area. Individual perimeter drains are recommended around all basement areas.
Finished basement floors should be placed three feet above existing groundwater.
Upon completion of the site grading, additional borings will need to be drilled at 500-foot intervals in
the proposed streets in accordance with City requirements. At that time, the requested laboratory
tests will be performed and the data submitted to the City of Fort Collins. When traffic data is
received from the City, pavement sections will be provided for the streets within the development.
The additional information provided herein, in our opinion, meets the new City requirements for this
phase of the project. If you have any additional questions regarding this project, please do not
hesitate to contact us.
Sincerely, '
TERRACON CONSULTANT WE_FERN,,(N7r% ,
Empire Di isinn , Reviewed b ���` I EG ;�'o�
, - ` 2575 F , pQP•.....,.��� ''%
K AIPG
18829 _
eil R. Shetl/rod 9%yFQ W
� William J. Attwooll, P. .
Senior Engineering Geologist °9 ;:,; Office Manager %'`F '•.•• ••,•.�
.,N S
Copies to: Addressee (1) /0 NAL�
Stewart and Associates, Inc. - Mr. Jack Blake (4)
1967 I=i161112
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SCALE 1:24000
1 1/2 0 1 MILE
1000 0 1000 2000 3000 4000 5000 6000 7000 FEET
I .5 0 1 IGLOMETER
CONTOUR INTERVAL 10 FEET
NATIONAL GEODETIC VERTICAL DATUM OF 1929
FIGURE 1 : VICINITY MAP
ENGLISH RANCH SOUTH
FORT COLLINS, COLORADO
TCW INC. PROJECT No. 20955134 1 rerracon
CONSULTANTS WESTERN, INC.
EMPIRE DIVISION
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LOG OF BORING No. 2 Page 1 of 1
CLIENT ARCHITECT,'ENGINEER
Bartran Homes
SITE Minor Road PROJECT
Fort Collins, Colorado 55 Acre Residential Site
SAMPLES TESTS
u DESCRIPTION > w z\ X w H= W
= 2 W 7 1 0 F- O zZ Jfn
4_ F- In m W O 3 fn O W J fn
¢ 0- U L IL U F-O Fa }IL U tY LL. W W lL
LD Approx. SurfaceElev.: 101.5 ft. o z M M Nm E oa MCnna- u3iaa
^A"A^ 0.5 6" TOPSOIL 101.0 1 SS 12" 10 13
LEAN CLAY M:EH, `(
Y
Brown, moist, Stiff
CL
2.5 99.0
2 ST 12" 16 108 11590
CL 3 SS 12" 4 16
SANDY LEAN CLAY__— 5
Tanlred, moist to wet
Stiff to medium
4 ST 12" 22 105 3230
5 SS 12" 6 19
10
I
14.0 87.5
TY SAND WITH QRAVEL6 1 SS 12" 7 14
15.0 Red, moist, medium dense 86.5
15
BOTTOM OF BORING
THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES
BETWEEN SOIL AND ROCK TYPES: IN-SITU, THE TRANSITION MAY BE GRADUAL.
WATER LEVEL OBSERVATIONS BORING STARTED 8-4-95
4 None W.D. s 11.81
A.B. rerr icon RIG BORING COMPLETED -95
Cb FOREMAN
WL I
lE-55 DbII
Water checked 3 days A.B. APPROVED NRS JOB d 20955134
ILWWL
4
LOG OF BORING No. 3 Page 1 of 1
CLIENT ARCHITECT/ENGINEER
Bartran Homes
SITE Minor Road PROJECT
Fort Collins, Colorado 55 Acre Residential Site
SAMPLES TESTS
LLI
H DESCRIPTION LL m w z cr z z
z x W =- I W a z z JU1
0. I- En m W O :9 U) ow J(n
Q: d U S IL U HO H >_LL UQ:LL W WLL
CD Approx.Surface Elev.: 100.4 ft. o M z � W v°"0 r_ oar. D(nOL (ACLCLo-
0.5 6" TOPSOIL 99.9 1 SS 12" 9 15
LEAN CLAY WITH SAND
Brown, moist, stiff to hard
CL
r^ A/A,
3.0 97.4
2 ST 12" 14 115 370
3 SS 12" 7 17
5
SANDY LEAN CLAY—
Tan\red, moist to wet
Medium to stiff CL 4 ST 12" 24 98 3060 505
5 SS 12" 4 22
10
I
6 SS 12" 4 23
15.0 85.4 15
BOTTOM OF BORING
THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES
BETWEEN SOIL AND ROCK TYPES: IN-SITU, THE TRANSITION MAY BE GRADUAL.
WATER LEVEL OBSERVATIONS BORING STARTED 84-95
IVL y 12.8' W.D � 12X A.B11rerraca
BORLVG COMPLETED $-4-95
WL - - n RIG CME-J5 FOREMAN DNEI,
'vL Water checked 3 days A.B. APPROVED NRS jJO13,v 20955134
LOG OF BORING No. 4 Page 1 of 1
CLIENT ARCHITECT/ENGINEER
Bartran Homes
SITE Minor Road PROJECT
Fort Collins, Colorado 55 Acre Residential Site
SAMPLES TESTS
(D ., .j �-
O O F o
J H C] LL + H W C9
U DESCRIPTION } W z\ a z H� W a
H fA W W O W LL_C9 CO fA\
2 2 W > i Cn F• O zz 0:f-J
0- F- N C] W O 3 (n O W W H 0-
0- U £ 0- U F-O H >-W U M U. F£\
CD Approx. Surface Elev.:99.5 ft. o m z Ex min E oa �csa ¢_j_j
0.5 6" TOPSOIL 99.0 1 SS 12" 13 14
. A
LEAN CLAY
Brown, moist, stiff
Composite sample 0.5 to 4 ft. CL 2 BS 36/19/17
2.5 97.0
3 ST 12" 15 110 10560 SWELL
140 psf
5 CL 4 SS 12. 6 19
SANDY LEAN CLAY
Tan\red, moist to wet
Medium to stiff
5 ST 12" 15 109 3020 SWELL
85 psf
6 SS 12" 6 16
10
A
14.0 - 85.5
WELL GRADED _ SW 7 SS 12" 9 15
15.0 SAND WITH GRAVEL 84.5
Tan, wet, loose to medium dense 15
BOTTOM OF BORING
THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES
BETWEEN SOIL AND ROCK TYPES: IN-SITU, THE TRANSITION MAY BE GRADUAL.
WATER LEVEL OBSERVATIONS BORING STARTED 8-4-95
wL Q 13.6' W.D• � None A.B. BORING COMPLETED 84-95
Irerracon RIG CME-55 FOREMAN DMI,
wL Water checked 3 days A.B. APPROVED NRS IJOB k 20955134
LOG OF BORING No. 5 Page 1 of 1
CLIENT ARCHITECT ENGINEER
Bartran Homes
SITE Minor Road PROJECT
Fort Collins, Colorado 55 Acre Residential Site
SAMPLES TESTS
0 .. 't >-
0 0 t✓ a- 0
J H m LL H w
H DESCRIPTION N w z\ w w LL�
0- � cn m w 0 i 3 Cn o o w
Ix CL U s a U 1-0 H r LL UXLL
w Approx. Surface Elev.: 98.5 ft. 0 z � w U)(13 ME mcncL
0 5 6"TOPSOIL 98.0 1 SS 12" 9 12
i_.F_AN CLAY WITH SAND CL
1.5 Brown, moist, stiff 97.0
2 ST 12" 12 97 2880
CL 3 SS 12" 4 16
5
SANDY LRAN CLAY
Tanlred, moist, medium
4 ST 12" 19 106 3180
5 SS 12" 5 16
10
6 SS 12" 6 24
15.0 83.5 i5
BOTTOM OF BORING
THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES
BETWEEN SOIL AND ROCK TYPES: IN-SITU, THE TRANSITION MAY BE GRADUAL.
WATER LEVEL OBSERVATIONS BORING STARTED 8_4_95
g None W D None A B �Ierracon �GRIIdG COMPLETED FOB g�_gg
%vLcME-55 Dru.
,-'n- Water checked 3 days A.B. APPROVED NRS I JOB d 20155134
LOG OF BORING No. 7 Page 1 of 1
CLIENT ARCHITECT�ENGINEER
Bartran Homes
SITE Minor Road PROJECT
Fort Collins, Colorado 55 Acre Residential Site
SAMPLES TESTS
O O I F- a
w H W LD
LL U DESCRIPTION £ � z\ it z H� w a-
H N m W a W LLU' m(A\
2 2 W > I N F O Zz 0:F-J
(L H O CO W O 3 fA O W W H 0-
0- U E 0- U HO H }LL UO:LL FE\
0 Approx. Surface Elev.: 102.5 ft. o ch z F- aim z oU0- �(na- ¢��
^" 0.5 6" TOPSOIL 102.0 1 SS 12" 15 13
LEAN CLAY MTH SAND CL
Brown, moist, very stiff to hard
2.0 Composite sample 0 0.5 to 4 ft. 100.5 2 BS 34/18/16
3 ST 12" 10 107 11100 SWELL
385 psf
4 SS 12" 5 18
5
SANDY LEAN AY CL 5 ST 12" 20 88 1370
Tan\red, moist to wet
Stiff to medium
6 SS 12" 3 19
10
i
7 SS 12" 3 19
15.0 87.5 IS
BOTTOM OF BORING
'HE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES
BETWEEN SOIL AND ROCK TYPES: IN-SITU, THE TRANSITION MAY BE GRADUAL.
WATER LEVEL OBSERVATIONS BORING STARTED 8-4-95
w-L Q 11.3' W.D. = 11.3' A.Arerracon
BORING COMPLETED 5-4-95
%� - RIG CME-55 FOREMAN DN L
W'L Water checked 3 days A.B. APPROVED NRS JOB# 20955134
LOG OF BORING No. 8 Page 1 of 1
CLIENT ARCHITECT/ENGINEER
Bartran Homes
SITE Minor Road PROJECT
Fort Collins, Colorado 55 Acre Residential Site
SAMPLES TESTS
LD ., X
H m 1~L w H W
LL
N DESCRIPTION Cn x w z\ 3 W Z(D M
x x W > I to o zz _jtn
D_ H 0 m W O 3 fn O W J to
d U = a U 1--O H >-lL UmLL WWIL
0 Approx, Surface Elev.: 100.5 ft. o M z F_ W (nca E oa :5u)a. u3iaa
^^^^^ 0.5 6" TOPSOIL I00.0 1 SS 12" 11 13
LEAN CLAY W1114 SAND
Brown, moist, stiff CL
3.0 97.5
2 ST 12" 17 98 4490 500
3 SS 1 12" 5 15
5
SANDY LEAN CLAY
Tan\red, moist
Stiff to medium
CL 4 ST 12" 18 100 1420
5 SS 12" 6 20
10
Q
6 SS 12" 3 25
15.0 85.5 15
BOTTOM OF BORING
THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES
BETWEEN SOIL AND ROCK TYPES: IN-SITU, THE TRANSITION MAY BE GRADUAL.
WATER LEVEL OBSERVATIONS BORING STARTED 8-4-95
WL Q 11.8' W.D. = 11.4' A.B. lrerracon
BORING COMPLETED 8-4-95
WI RIG CME-gj FOREMAN DINEL
L Water checked 3 days A.B. APPROVED NRS JOB N 20955134
LOG OF BORING No. 9 Page I of I
CLIENT ARCHITECT I ENGINEER
Bartran Homes
SETE Minor Road PROJECT
Fort Collins, Colorado 55 Acre Residential Site
SAMPLES TESTS
C3 c o
w H W CD
LL
U DESCRIPTION >. 0 z\ z z HZ w Q
H U W W M W LL.0 C]N\
_ = W D. I N H O ZZ W: __1
(L H N m W O 3 N ow WHO-
a- U E 0- U Ho H >-LL. U M U- F-r_\
W Approx. Surface Elev.: 98.5 ft. n � z � z (A(a E oa Ewa ¢_j_j
^ ^ ^ 0.5 6" TOPSOIL 98.0 1 SS 12" 12 14
LEAN CLAY WITH SAND
Brown, moist, stiff
Composite sample®0.5 to 4 ft. CL 2 BS 31/15/16
2.5 96.0
3 ST 12" 18 100 1420
5 4 SS 12" 8 25
SANDY LEAN CLAY_
Tan\red, moist to wet
Medium to stiff
CL 5 ST 12" 17 Ill 3840 SWELL
50 psf
6 SS 12" 3 25
10
V
14.0 Q 84.5
W V 7 SS 12" 10 25
15.0 Red, moist, medium dense 83.5
15
BOTTOM OF BORING
THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES
BETWEEN SOIL AND ROCK TYPES: IN-SITU, THE TRANSITION MAY BE GRADUAL.
WATER LEVEL OBSERVATIONS BORING STARTED 8-4-95
� 8-4
� 13.7' W.D. � liA' A.B. Irerracon
�GRL CNIE-55 BONG COMPLETED FOREMAN-95
DML
Water checked 3 days A.B. APPROVED NRg Joe x 20955134
LOG OF BORING No. 12 Page 1 of I
CLIENT ARCHITECT I ENGINEER
Bartran Homes Stewart & Associates
SITE Kingsley Drive PROJECT
Fort Collins, Colorado En lish Ranch South
SAMPLES TESTS
W .. _j X r
0 0 r o
r co U. H w
H DESCRIPTION v U) M w Z\ W L_C
d H (n CO W Z.
3 U) ow
w
Q a- U E (L U F-o H r LL U W LL
W Approx. Surface Elev.: 4932.0 ft. o M z � (nCO E oa M(na-
AAAAA 12" TOPSOIL I SS 12" 11 13
A A A
w w
AAAAA 1.0 4931.0
CL 2 ST 12" 26 93 1160
SANDY LEAN CLAY 3 SS 12" 2 44
Brown/red, moist to wet
Soft to stiff g
i 4 ST 12" 25 98 1330
5 SS 12" 7 19
10
6 SS 12" 7 22
15.0 4917.0 15
BOTTOM OF BORING
THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES
BETWEEN SOIL AND ROCK TYPES: IN-SITU, THE TRANSITION MAY BE GRADUAL.
WATER LEVEL OBSERVATIONS BORING STARTED 8-20-86
IW
UNone W.D. = 7.2' A.B. BORING COMPLETED 8-20-86
1 �e rracon RIG CME-55 FOREMAN LRS
Water checked 1 dayA.B. APPROVED NRS JOB# 20955134
LOG OF BORING No. 13 Page 1 of 1
CLIENT ARCHITECT I ENGINEER
Bartran Homes Stewart & Associates
SITE Kingsley Drive PROJECT
Fort Collins, Colorado English Ranch South
SAMPLES TESTS
LD ., J N: >-
0 0 0
r H m U_ H W
H DESCRIPTION N w Z\ ix w LL�
Q d zz
U co a. W i_o H OLL ow
CD Approx. Surface Elev.: 4932.0 ft. n z F_ � U)in E o a Z)En a.
12"TOPSOIL 1 SS 12" 16 10
A A
A^^�^ 1.0 4931.0
CL 2 ST 12" 26 93 1650
i
SANDY LEAN CLAY 3 SS 12" 3 26
Brown/red, moist to wet
Soft to stiff 5
= 4 ST 12" 25 98 1100
Sz
5 SS 12" 5 20
10.0 4922.0
Gravelly below 10.0' 10
i
6 SS 12" 9 13
15.0 4917.0 15
BOTTOM OF BORING
THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES
BETWEEN SOIL AND ROCK TYPES: IN-SITU, THE TRANSITION MAY BE GRADUAL.
WATER LEVEL OBSERVATIONS BORING STARTED 8-20-86
�
4 7.8' W.D. Z 7
•1' A.B. 11rerracon RIG BORING COMPLETED -86
CMEE-55 FOREMAN LRS
WL Water checked 1 day A.B. APPROVED NRS IJOB# 20955134
LOG OF BORING NO. 14 Page 1 of 1
CLIENT ARCHITECT/ENGINEER
Bartran Homes Stewart& Associates
SITE Kingsley Drive PROJECT
Fort Collins, Colorado English Ranch South
SAMPLES TESTS
J LL E �- W N Z m
H DESCRIPTION N w Z\ ' w HLL�
OLU
(c 0. U E OW.. U HO H YLL UO:LL
w Cn O } W dJ O WU Z1-N
LD Approx. Surface Elev.: 4930.0 ft. a m Z I- ft (n co I_- o a. =M a
^ " " 12"TOPSOIL 1 SS 12" 15 9
A^A"A
""""" 1.0 4929.0
CL 2 ST 12 1 25 94
SANDY LEAN CLAY 3 SS 12" 2 24
Brown/red, moist to wet
Soft to stiff 5
4 ST 12" 27 96 970
5 SS 12" 5 19
10
6 SS 12" 7 22
I5.0 4915.0 15
BOTTOM OF BORING
THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES
BETWEEN SOIL AND ROCK TYPES: IN-SITU, THE TRANSITION MAY BE GRADUAL.
WATER LEVEL OBSERVATIONS BORING STARTED 8-20-86
W:W Q 7.5' WD t 7.3' A.B. BORING COMPLETED 8-20-86
WL - IrerraConIRIG CM -5 5 FOREMAN LRS
L Water checked 1 da A.S. APPROVED NRS JOB N 20955134