CDC Geotechnical Report.pdf

CDC Site (Borings CDC-B1 through CDC-B4)

Soil Profile

The general stratigraphy encountered in the test borings consisted of indigenous overburden soils underlain by Limestone bedrock. The indigenous soil profile consisted of an upper layer of cohesive silt and clay soils, with varying amounts of intermixed sand and gravel, extending to depths ranging from approximately 4 to 10 feet. The upper cohesive soil layer transitioned to cohesionless sand and gravel soils with varying amounts of intermixed silt. Boulders were encountered in the borings at various locations beginning at depths ranging from approximately 4 to 6 feet.

SPT “N” values obtained in the upper cohesive indigenous soils ranged from 5 to 49 indicating the consistency of these soils varies from “Medium” to “Hard”. SPT “N” values obtained in the cohesionless indigenous soils ranged from 30 to greater than 50 indicating the relative density of these soils varies from “Compact” to “Very Compact”.

Bedrock

Auger refusal (apparent top of bedrock) was encountered in the test borings at depths ranging from 9.0 to 15.0 feet. The following table summarizes the approximate depths/elevations that auger refusal was encountered at each boring location.

Approximate Depth and Elevation of Auger Refusal (Apparent Top of Bedrock) Boring No. Ground Surface

Elevation (feet)

Approximate Depth of Auger Refusal (feet)

Approximate Elevation of Auger Refusal (feet)

CDC-B1 574.52 15.0 559.52

CDC-B2 572.61 18.5 554.11

CDC-B3 576.22 9.0 567.22

CDC-B4 571.29 9.3 561.99

A bedrock core sample was obtained at test boring CDC-B2 after reaching auger refusal. The bedrock core recovered consisted of gray, medium hard, slightly weathered and fractured Limestone rock.

The core recovery value was 100% and the rock quality designation (RQD) value was 72% indicating the recovered rock core rock mass quality was “fair”.

Groundwater Conditions

Free standing water was not encountered in the borings upon completion of drilling and sampling. However, some of the recovered soil samples were described as “wet” at various depths and locations indicating that perched or trapped groundwater conditions were likely present. Zones of wet soil conditions were encountered in the borings beginning at depths ranging from 4 to 10 feet and it is expected that perched or trapped groundwater conditions will be present within these zones following periods of wet weather.

DATE BORING NO. CDC-B1

START: PROJ. NO. G09-2503

FINISH: SURF. ELEV. 574.52'

SHEET OF 1 G.W. DEPTH See NOTES

PROJECT: FY 10 and FY 11 Projects - Child Development Center LOCATION: N 1471849.6133 E 1022469.5515 South Riva Ridge Loop at PO Valley Road Fort Drum, New York

BLOWS ON SAMPLER

0/6 6/12 12/18 18/24 N

4 4 4 6 8 0.8

4 5 5 3 10 1.0

8 5 38 33 43 1.2

65 100/4 REF 0.7

CLASSIFICATION: Visual by

DRILLER:

METHOD OF INVESTIGATION:

100/0

REF

Very Stiff, Grades to "AND" CLAY

Brown Compact Fine-Coarse GRAVEL, Some Fine-Coarse Sand, SA

M

PL

E

N O

10 49

ASTM D 1586 using 3.25" I.D. Hollow Stem Augers

316 65

SA

M

PL

ES

REF = Sample Spoon Refusal Free standing water was not

Geotechnical Engineer encountered upon completion of drilling

1.1

Boring terminated with auger refusal at 15.0 feet

1.7

Hard, Contains Boulder Fragments

Very Compact, Grades To "Trace" Silt, Contains Boulder

NOTES

CME 550

DEPTH

(ft.)

REC.

(ft.)

SUBSURFACE EXPLORATION LOG

SOIL OR ROCK

CLASSIFICATION

4/16/2009 4/16/2009

Brown Stiff SILT, Little Clay, Moist (ML)

Stiff, Grades to "Some" Fine Sand, "Little" Clay, Wet

Contains Rock Fragments

Fragments (GP)

Little Silt, Dry (GM)

20 1.275

DRILL RIG TYPE :

N = NO. BLOWS TO DRIVE 2-INCH SPLIT SPOON 12-INCHES WITH A 140 LB. PIN WT. FALLING 30-INCHES PER BLOW

M. Blakely

DATE BORING NO. CDC-B2

FINISH: SURF. ELEV. 572.61'

SHEET OF 1 G.W. DEPTH See NOTES

PROJECT: FY 10 and FY 11 Projects - Child Development Center LOCATION: N 1471761.0067 E 1022417.9605

1 4 4 6 8 0.9

3 4 8 9 12 1.3

8 17 12 11 29 1.7

NQ Size Rock Core

100/0 REF NR

METHOD OF INVESTIGATION:

Brown Compact Fine-Coarse SAND, Some Gravel, Trace Silt, 11 11

53 1.712

Boring terminated at 23.5 feet

Brown Stiff SILT, Some Clay, Some Fine-Medium Sand, Stiff

Moist (SP)

SAND, Trace Silt, Moist (GP)

DEPTH

(ft.)

REC.

(ft.)

SUBSURFACE EXPLORATION LOG

SOIL OR ROCK

CLASSIFICATION

4/15/2009 4/15/2009

SA

M

PL

ES

CME 550DRILL RIG TYPE :

N = NO. BLOWS TO DRIVE 2-INCH SPLIT SPOON 12-INCHES WITH A 140 LB. PIN WT. FALLING 30-INCHES PER BLOW

M. Blakely

NOTES

Slightly Fractured And Weathered encountered upon completion of drilling

Brown Compact SILT AND Fine SAND, Wet (ML)

Free standing water was not

RQD = 72%

Gray Limestone, Medium Hard, Laminated To Thin Bedded, Moist (ML)

1.9

2.0

Very Stiff

Brown Very Stiff SILT AND CLAY, Moist (ML)

Geotechnical Engineer

REF = Sample Spoon Refusal NR = No Recovery

REC = 100%

Run #1 = 18.5' - 23.5'

1.6

Brown Very Compact Fine-Coarse GRAVEL AND Fine-Coarse7 24

ASTM D 1586 using 3.25" I.D. Hollow Stem Augers

SA

M

PL

E

N O

8 18

Grades To "Little" Clay, "Trace" Gravel

394041

DATE BORING NO. CDC-B3

FINISH: SURF. ELEV. 576.22'

SHEET OF 1 G.W. DEPTH See NOTES

PROJECT: FY 10 and FY 11 Projects - Child Development Center LOCATION: N 1471932.2111 E 1022533.0057

1 3 4 6 7 1.0

2 100/.4 REF 0.6

20 11 100/.1 REF 0.5

100/.0 REF NR

auger refusal at 5.5', boring was offset 5' and continued to a

METHOD OF INVESTIGATION:

Brown Very Compact Fine-Coarse GRAVEL, Some Fine-Coarse

SA

M

PL

E

N O

6 137

ASTM D 1586 using 3.25" I.D. Hollow Stem Augers

REF = Sample Spoon Refusal NR = No Recovery Driller noted boulders from 5.5'

Initial boring attempt encountered

Geotechnical Engineer encountered upon completion of drilling

1.3

Gravel, Boulders, Wet (SM)

Stiff, Grades to "Little" Fine Sand depth of 9.0'

NOTES

Free standing water was not

CME 550

SA

M

PL

ESDEPTH

(ft.)

REC.

(ft.)

SUBSURFACE EXPLORATION LOG

SOIL OR ROCK

CLASSIFICATION

4/16/2009 4/16/2009

Brown Medium SILT AND CLAY, Moist (ML)

Brown Very Compact Fine-Coarse SAND AND SILT, Little to 7.5'

Boring terminated with auger refusal at 9.0 feet

Sand, Wet (GP)

DRILL RIG TYPE :

N = NO. BLOWS TO DRIVE 2-INCH SPLIT SPOON 12-INCHES WITH A 140 LB. PIN WT. FALLING 30-INCHES PER BLOW

DATE BORING NO. CDC-B4

FINISH: SURF. ELEV. 571.29'

SHEET OF 1 G.W. DEPTH See NOTES

PROJECT: FY 10 and FY 11 Projects - Child Development Center LOCATION: N 1471684.7342 E 1022621.4987

3 2 3 4 5 1.0

3 3 2 2 5 1.2

19 22 100/.3 REF 0.9

approximately 5' away from initial boring to verify the refusal

METHOD OF INVESTIGATION:

Contains Rock Fragments

SA

M

PL

E

N O

8 15

15 30

ASTM D 1586 using 3.25" I.D. Hollow Stem Augers encountered at a depth of 9.0'

A probe boring was performed

Geotechnical Engineer

Free standing water was not

REF= Sample Spoon Refusal of drilling

Boulder Fragments, Moist (SM) 1.3

(CL)

1.6

(ML)

Brown Compact Fine-Medium SAND, Little Gravel, Little Silt, Brown Very Stiff CLAY AND SILT, Trace Fine Sand, Moist

Boring terminated with auger refusal at 9.3' depth. Probe refusal was

NOTES

encountered upon completion

CME 550

SA

M

PL

ESDEPTH

(ft.)

REC.

(ft.)

SUBSURFACE EXPLORATION LOG

SOIL OR ROCK

CLASSIFICATION

4/16/2009 4/16/2009

Brown Medium SILT, Little Clay, Moist (ML)

Brown Medium SILT AND CLAY, Trace Fine Sand, Moist

7 17

DRILL RIG TYPE :

N = NO. BLOWS TO DRIVE 2-INCH SPLIT SPOON 12-INCHES WITH A 140 LB. PIN WT. FALLING 30-INCHES PER BLOW