Section-J_06_Soiling_Investigation_Report_Added_18_Jul_17.pdf

Construct Vet Clinic Admin Annex, Kadena Air Base, Okinawa, Japan

Soil Investigation Report

February 2016

SG ENGINEERING INC.

1-6-5 Shimashi, Ginowan-City, Okinawa, 901-2213

TEL:(098) 892-1326 FAX:(098) 892-0907

Testing performed by and report prepared by:

Shindo Soil Investigation Co., Ltd.

1-22-28 Mashiki, Ginowan-city, Okinawa, Japan

TEL:(098) 897-4240 FAX:(098) 897-6890

Construct Vet Clinic Admin Annex, Kadena Air Base, Okinawa, Japan

Table of Contents

Section Chapter Page

1. Outline of Soil Investigation

A. General Purpose ·········································································· 1

B. General Requirements ·········································································· 1

Guide Map of the Project Site ·········································································· 2

Investigation Site Map ·········································································· 3

2. Conclusion and Recommendation

A. Structural Recommendation ·········································································· 4

Investigation Result Data Soil Boring Drilling Log

Photographs Soil Boring Investigation

- 1 -

Section 1 Outline of Soil Investigation

A. General Purpose:

The general intent and purpose of the soil investigation, which is fully described in this report, is to be able to identify the soil bearing capacity of the ground where the proposed structure will be sited.

B. General Requirements:

Shindo Soil Investigation Co. Ltd. physically performed a soil investigation under the management and supervision of SG Engineering Inc.. Soil boring was performed using a drilling machine and a 66mm diameter single core tube bit. N-value measurements were taken to penetrate into the ground at 1.0-meter depth intervals.

Soil Types reveals during Soil Boring Investigation

Specification of Layer (m) Boring No.

Elevation of top hole

(TBM m) Clay Gravel Rock Total Depth

(m) Total Blow of S.P.T.

B – 1 50.22 1.00 8.20 0.80 10.00 10

- 2 -

Guide Map of the Project Site

Kadena Vil.

Okinawa City

Kadena Air Base

Project Site

Chatan Vil.

- 3 -

In ve st ig at io n Si te M ap

N o

Sc al e

- 4-

Section 2 Conclusion and Recommendation

From consideration of investigation results, recommendation for the foundation of the proposed structure is shown as follows.

A. Structural Recommendation

Proposed site is covered by native Fat Clay (CH) layer. Under the Fat Clay layer appears native soil

Decomposed Coral Limestone’s Silty Sandy Gravel (GM). This layer represents from medium dense to very dense status, it gradually increase the denseness along with the depths. And hard solid Coral Limestone layer is inserted among Decomposed Coral Limestone’s Silty Sandy Gravel (GM) (Reference the attached drilling log).

A structure at the proposed site is assumed to be comparatively light weight structure with spread foundation. But it seems that the most suitable bearing layer for the proposed structure has to be either supported to Solid Limestone layer or medium dense zone of Silty Sandy Gravel (GM).

Therefore, although it depends on the weight of the proposed structure, the consideration from viewpoint of structure design and economic side adequately is necessary.

However, it is concerned that irregular changes of layer might be confirmed during construction phase. Therefore, it is necessary to perform site inspection to confirm the appearance of bearing layer when the design and location of proposed structure has been determined and it may need to perform plate bearing test to confirm the actual bearing capacity.

Fig. 1 Drilling log of Boring

Investigation Result Data

Soil Boring Drilling Log

Hole No. B – 1

DRILLING LOG DIVISION INSTALLATION SHEET 1 OF 1 SHEET

10.SIZE AND TYPE OF BIT 66mm Dia. Single Core Tube Bit & Split Spoon sampler 1.PROJECT Construct Vet Clinic Admin Annex, Kadena Air Base, Okinawa, Japan 11.DATUM FOR ELEVATION SHOWN (TBM or MSL) Temporary Bench Mark (TBM)

2.LOCATION (Coordinates or Station) Shown on the Map 12.MANUFACTURE S DESIGNATION OF DRILL YBM Co. Ltd. Model=YBM-05

3.DRILLING AGENCY

Shindo Soil Investigation Co. Ltd

13.TOTAL NO. OF OVERBURDEN SAMPLES

TAKEN

DISTURBED

10 Samples

UNDISTURBED

None

4.HOLE NO. (As shown on drawing title and file number) B – 1 14.TOTAL NUMBER CORE BOXES None 5.NAME OF DRILLER OHAMA, Yoshiki 15.ELEVATION GROUND WATER None 6.DERECTION OF HOLE VERTICAL INCLINED DEG. FROM VERT. 16.DATE HOLE STARTED 8 Feb. 2016 COMPLETED 8 Feb. 2016 7.THICKNESS OF OVERBURDEN 0.00m(Filled Material) + 9.65m(Natural Soil) 17.ELEVATION TOP OF HOLE TBM = 50.22m 8.DEPTH DRILLED INTO ROCK 0.80m 18.TOTAL CORE RECOVERY FOR BORING

9.TOTAL DEPTH OF HOLE 10.45m 19.SIGNATURE OF INSPECTOR Kazuaki Shindo

STANDARD PENETRATION TEST TBM

(m) 50.22

DEPTH

(m) 0.00

LEGEND CLASSIFICATION OF MATERIALS

(Description)

Blow Count of

S.P.T.

DEPTH &

Blow Count /10cm

N Value & Percentage of limestone content 10 20 30 40 50

49.22 1.00

Fat Clay (CH) Brown / Medium Moisture, High Plasticity

Sedimentary layer principally consists of fat clay. Slightly contains grass roots and fine fragments of limestone.

0% 20% 40% 60% 80% 100%

1.15m 10 3, 5, 2

1.45m

48.22 2.00 2.00m 50/3cm 50/3

Decomposed Coral Limestone [Silty Sandy Gravel (GM)] Milky Brown / Medium Moisture, None Plasticity

Sedimentary layer of former coral debris principally consists of silt and medium to coarse limy sand intermingled with angular fragments of limestone around 15mm.

Relative Density: Medium Dense Layer 2.03m

47.42 2.80 3.00

75%

3.15m

Coral Limestone / Milky White Moderately hard porous coral limestone layer solidified by re-crystallization of former coral debris. Confirmed thin insertion of sandy gravel irregularly.

8 2, 2, 4 3.45m

4.00 4.15m

20 9, 6, 5 4.45m

5.00 5.15m

26 8, 12, 6 5.45m

6.00 6.15m

19 6, 5, 8 6.45m

7.00 7.15m

50/5cm 50/5 7.20m

8.00

45%

8.15m 50/10cm 50

8.25m

9.00

40%

9.15m 50/27cm 3,13,34/7

9.42m

10.00

50%

10.15m

39.77 10.45

Decomposed Coral Limestone [Silty Sandy Gravel (GM)]

Buff to Light Yellow to Buff to Milky Brown Medium Moisture, None Plasticity

Sedimentary layer of former coral debris. Principally consists of silt and limy sand intermingled with angular fragments of limestone. Soft clay inflow layer was confirmed at 10m depth.

Sand; Grain size varies widely, but medium to coarse size is conspicuous.

Gravel; Sizes was less than 20mm generally. Partially varies between 20mm to 35mm.

Occasionally inserts thin layer of moderately hard solidified limestone.

Confirmed percentages of solidified limestone content at each depth are shown by bar graph.

Bedrock substance intersperse at bottom portion.

Relative Density:

Loose to Medium Dense to Very Dense

40 20, 11, 9 10.45m

11.00

12.00

Bottom of Hole

13.00

14.00

15.00

16.00

ENG FORM 1836 PREVIOUS EDITIONS MAY BE USED PROJECT: Construct Vet Clinic Admin Annex, Kadena Air Base, Okinawa, Japan

HOLE No.

B – 1

P h o t o g r a p h

Soil Boring Investigation

C o n s tr u c t

V e t

C li n ic

A d m in

A n n e x

K a d e n a

A ir

B a s e

O k in a w a

J a p a n

P ro je c t

S it e

V ie w

Hole No. B-1

State of

Before Drilling

State of Site

Standard Penetration

Test

Left Rods Length

Left Length= 0.36m

Total Rods Length

Used Rods 3.0m×3= 9.00m 1.0m×1= 1.00m

SPT Sampler= 0.81m Total Length=10.81m

Left Length= 0.36m Total Depth of Hole=10.45m

After Drilling