Borehole BH-46 – Runway (Pavement Thickness: 0.9 m ...dotr.gov.ph/images/Foreign_Assisted_Projects/2015/... · Borehole BH-46 – Runway (Pavement Thickness: 0.9 m + Subgrade/Slope:

Section VI. Works Requirements WKR-101

101

Borehole BH-46 – Runway (Pavement Thickness: 0.9 m + Subgrade/Slope: 1.0 m)

Existing Grade: 8.0 m Finished Grade: 9.3 m Subgrade Elevation: 7.4 m Cut height: 0.6 m

Pictures of disturbed soil samples

Moisture contents of disturbed soil samples

Location SS1 SS2 SS3 SS4 SS5

Can Number 1 2 3 4 5

Weight of can & wet soil, g. 228.09 159.56 126.42 163.79 118.55

Weight of can & dry soil, g. 203.40 141.23 115.21 153.17 109.21

Weight of water, g. 34.69 18.33 11.21 10.62 9.34

Weight of can, g. 21.79 21.06 24.90 23.06 22.13

Weight of dry soil, g. 181.61 120.17 90.31 130.11 87.08

Moisture Content, % 19.10 15.25 12.41 8.16 10.72

Subgrade Cut 0.6m


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Borehole BH-46 – Runway (Pavement Thickness: 0.9 m + Subgrade/Slope: 1.0 m) No fine topsoil exists. No large cavity exists.

Natural soil at subgrade level (0.6 m deep) is dense (N-value of 30 to 40) but porous. It will require

blending with small amount of crashed limestone fragment when used for granular subbase course.

Coarse side Fine side

SS-1: 0.5 m deep

Grading Requirements for Granular Subbase

SS-2: 1.5 m deep

SS-3: 2.5 m deep


SS-4: 3.5 m deep

Fine side Coarse side


103









Weight of water, g. 20.33 23.15 35.17 10.32 12.39

Weight of can, g. 20.21 21.17 23.86 20.97 25.06



Subgrade Cut 0.6m


104


Natural soil at subgrade level (0.6 m deep) is dense (N-value of 30 to 40) but porous. I will require

blending with crashed limestone fragment when used for granular subbase course.


SS-1: 0.5 m deep


SS-2: 1.5 m deep

SS-3: 2.5 m deep


SS-4: 3.5 m deep



105




Moisture contents of disturbed soil samples Location SS1 SS2 SS3 SS4 SS5




Weight of water, g. 8.96 14.88 9.25 16.43 12.98

Weight of can, g. 25.40 24.92 25.40 24.75 28.80



Subgrade Cut 1.4m


106


Natural soil at subgrade level (1.4 m deep) is dense (N-value of 60 to 70) but porous. It will require

blending with large amount of crashed limestone fragment when used for granular subbase course.


SS-1: 0.5 m deep


SS-2: 1.5 m deep

SS-3: 2.5 m deep


SS-4: 3.5 m deep



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Weight of water, g. 16.05 24.47 12.08 141.29 29.98

Weight of can, g. 22.31 20.18 21.17 20.13 23.12



Subgrade Cut 0.6m


108


Natural soil at subgrade level (0.6 m deep) is not much dense (N-value of 30). It will require blending

with large amount of crashed limestone fragment when used for granular subbase course.


SS-1: 0.5 m deep


SS-2: 1.5 m deep

SS-3: 2.5 m deep


SS-4: 3.5 m deep



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4.1.3 Observations and Findings

The Geological Survey Report (in Apr 2013; by Universal Testing Laboratory and

Inspection) recommends that:

Plasticity Index (PI) of soil is 6 to 10

Bearing capacity is 500 kPa (50 ton/ m²)

Slope gradient should not steeper than 1(V) : 1(H)

Subgrade Reaction (K) is 54 MN/m³ (200 pci ) for pavement or slab-on grade

Among 91 boreholes in total, only one (1) cavity happened to be detected, horizontal

distribution of which was unknown, and possibly another cavity may exist.

Therefore, several engineering practice shall be exercised during construction stage,

as follows:

a) Upon commencement, 5-m deep borehole investigation to the location of

footings for PTB, control tower and administration building would be carried out.

When excavation to the pavement subgrade level is completed, 2-m deep

borehole investigation would be carried out. Those are incorporated in the

specifications, BOQ and drawing of General Requirement so as to dictate

possible cavity.

b) When cavity is found during the course of earthwork, the cavity should be

removed to the bottom irrespective of the designed subgrade thickness.

c) Suspected weak soil underneath, if found, should be replaced, or grouted or

covered by concrete slabs when necessary, subject to further Engineers’

solution.


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4.2 Weather Conditions

Monthly rainfall recorded from 1998 to 2008 is summarized as shown in Table 4.2-1.

Table 4.2-1 Number of rainy days in each month of the year

MONTH 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 AVERAGE

JANUARY 35.50 177.80 64.10 85.30 52.40 78.50 64.40 26.20 95.70 185.50 264.70 102.74FEBRUARY 0.60 182.00 312.91 63.30 85.50 64.60 97.70 1.30 130.70 25.10 202.80 106.05MARCH 5.00 166.10 206.30 83.90 79.00 18.00 79.30 78.80 183.60 31.80 236.50 106.21APRIL TRACE 173.40 110.90 82.70 99.50 24.90 12.40 60.10 41.50 26.20 107.10 73.87MAY 8.40 73.00 71.00 77.90 47.30 207.20 185.50 42.90 66.80 124.10 179.20 98.48JUNE 52.70 173.10 125.50 193.60 197.90 196.00 148.00 137.50 125.00 244.10 294.00 171.58JULY 71.80 183.60 69.00 152.70 131.70 230.90 116.60 133.10 103.60 141.30 155.30 135.42AUGUST 83.40 219.90 96.40 117.90 130.90 179.00 109.40 129.50 111.50 50.50 241.00 133.58SEPTEMBER 36.80 81.10 67.30 62.10 57.60 122.10 109.40 81.30 72.60 154.20 131.10 88.69OCTOBER 177.40 189.10 301.50 187.40 156.50 266.20 102.10 92.50 140.50 214.60 176.20 182.18NOVEMBER 253.20 158.90 279.40 447.50 148.40 107.20 111.50 204.50 170.00 161.30 120.90 196.62DECEMBER 66.20 162.60 284.40 182.90 82.30 372.10 73.20 269.60 157.90 170.40 NA 182.16

YEARLY TOTAL 791.00 1,940.60 1,988.71 1,737.20 1,269.00 1,866.70 1,209.50 1,257.30 1,399.40 1,529.10 2,108.80 1,577.58

YEARLY AVERAGE 71.91 161.7 165.7 144.8 105.8 155.6 100.8 104.8 116.6 127.4 191.7 131.52

C A L E N D A R Y E A R S 1 9 9 8 - 2 0 0 8 (figures are in millimeters)

The Table shows that annual rainfall volumes are largely varying from 791 mm (in

1998) to2108 mm (in 2008).

The latest weather conditions daily recorded at Tagbilaran City from June 2010 to May

2011, i.e. for atmospheric pressure, temperature, humidity, rainfall, wind speed and

direction are shown in the subsequent pages.

During the same period, annual total rainfall was 2,400 mm. The most rainfall recorded

was in the month of January (i.e. 364 mm), and maximum rainfall was 94.6 mm in

October 2010. Judging from the 1-year record that air pressure of lower than 1000

hPa was not in the record, no tropical depression nor typhoon seemed to hit the area

Unlike Manila or other areas in the Philippines, Visaya area has an average rainfall

through the year (i.e., no distinguished rainy or dray seasons), and numbers of the day

on which more than 5-mm rain falls is 183. Those features in each month of the same

year are shown in Table 4.2-1.

Table 4.2-2 Number of rainy days in each month of the year


Tab

le 4

.2-3

(1)

Dai

ly W

eath

er D

ata

at T

agb

ilar

an C

ity

in J

un

e 20

10


Tab

le 4

.2-3

(2)

Dai

ly W

eath

er D

ata

at T

agb

ilar

an C

ity

in J

uly

201

0


Tab

le 4

.2-3

(3)

Dai

ly W

eath

er D

ata

at T

agb

ilar

an C

ity

in A

ugu

st 2

010


Tab

le 4

.2-3

(4)

Dai

ly W

eath

er D

ata

at T

agb

ilar

an C

ity

in S

epte

mb

er 2

010


Tab

le 4

.2-3

(5)

Dai

ly W

eath

er D

ata

at T

agb

ilar

an C

ity

in O

ctob

er 2

010


Tab

le 4

.2-3

(6)

Dai

ly W

eath

er D

ata

at T

agb

ilar

an C

ity

in N

ovem

ber

201

0


Tab

le 4

.2-3

(7)

Dai

ly W

eath

er D

ata

at T

agb

ilar

an C

ity

in D

ecem

ber

201

0


Tab

le 4

.2-3

(8)

Dai

ly W

eath

er D

ata

at T

agb

ilar

an C

ity

in J

anu

ary

2011


Tab

le 4

.2-3

(9)

Dai

ly W

eath

er D

ata

at T

agb

ilar

an C

ity

in F

ebru

ary

2011


Tab

le 4

.2-3

(10

) D

aily

Wea

ther

Dat

a at

Tag

bil

aran

Cit

y in

Mar

ch 2

011


Tab

le 4

.2-3

(11

) D

aily

Wea

ther

Dat

a at

Tag

bil

aran

Cit

y in

Ap

ril 2

011


Tab

le 4

.2-3

(12

) D

aily

Wea

ther

Dat

a at

Tag

bil

aran

Cit

y in

May

201

1


4.3 Land Acquisition and Resettlement

4.3.1 History

Land acquisition of the Right-of-Way (ROW) for the airport project in Panglao Island

already commenced as early as 1990s. Bohol Provincial Government (BPG) had been

entrusted by DOTC, DOT (Department of Tourism) and the Civil Aviation Authority of

the Philippines (CAAP) to conduct the acquisition of the ROW for the project by virtue

of a Memorandum of Agreement (MOA) dated 23rd January 1994. However, the new

project had not been materialized for two decades. During the non-materialization of

the project, another F/S was conducted in 2007, which realigned the project site

bearing North 30 degrees East. As a result, 32.6 ha out of 62.4 ha-land already

acquired became outside of the ROW.

From April to July 2012, under the Preparatory Survey assisted by JICA, a resettlement

action plan (RAP) for the project was prepared in accordance with JICA Guidelines for

Environmental and Social Considerations.

4.3.2 Scale and Status of Land Acquisition and Resettlement

As shown in Table 4.3-1, as of end of June 2013, the total area of the ROW is 223 ha,

which equivalents to 407 lots. Out of the total 407 lots in the ROW, 358 lots, 88.0 %,

are already acquired. Out of the remaining 49 lots, 40 are still for acquisition (under

negotiation), and 9 are for expropriation.

For the 40 plots still for acquisition, ‘Entry Permits’ obtained from the landowners are

necessary to enter the lands, which is under process by the BPG. For the 9 lots for

expropriation, the cases are under study by the Office of Solicitor General before filing

with the Court. Only after the permission by the Court (issuance of ‘Writ of Possession’),

the government agencies can enter the land and demolish houses if necessary. Out of

the 9 lots for expropriation, 4 lots are owned by one landowner, and two houses remain

in these 4 lots. According to DOTC officials, expropriation of the 9 lots including two

houses is most likely to complete within 2013.

Table 4.3-1 Status of Land Acquisitions as of June 2013

Lots Area (sq.m) Lot-wise ratio (%) Area-wise ratio (%)

Acquired through Purchase after Realignment 222 1,436,365 54.5% 64.4% Acquired through Purchase Before Realignment 32 298,639 7.9% 13.4% For Barter 99 321,978 24.3% 14.4% Government Owned ( Road) 5 18,635 1.2% 0.8%Sub-total: Acquired 358 2,075,617 88.0% 93.1% Still for Acquisition (Negotiation) 40 111,383 9.8% 5.0% For Expropriation 9 42,849 2.2% 1.9%Sub-total: Not Yet Acquired 49 154,232 12.0% 6.9%Total 407 2,229,849 100.0% 100.0%

Source: BPG

Documents

Borehole BH-46 – Runway (Pavement Thickness: 0.9 m ...dotr.gov.ph/images/Foreign_Assisted_Projects/2015/... · Borehole BH-46 – Runway (Pavement Thickness: 0.9 m + Subgrade/Slope: