Document Text Contents
Page 3
Subsurface Investigation for the Proposed Coron Power Plant
Sitio Tulawa, Brgy. Gudalupe, Coron, Palawan
_______________________________________________________________
________________________________________________________________________________
Geotechnical Evaluation Report
1
1.0 INTRODUCTION
This report presents the geotechnical evaluation of the results of
subsurface investigations conducted at the site of the PROPOSED
CORON POWER PLANT located within Brgy. Guadalupe, Coron,
Palawan.
The geotechnical investigation consisted of drilling three (3) boreholes
within the site in order to assess the subsoil conditions and evaluate its
characteristics. The soil samples recovered were then brought to the soil
laboratory for analysis and testing. Laboratory tests on selected soil
samples include:
Soil Classification using the USCS (ASTM D2487)
Grain Size Analysis (ASTM D422)
Atterberg Limits (ASTM D4318)
Determination of Moisture Content (ASTM D2216)
This report presents the field and laboratory procedures adopted in the
investigation as well as the evaluation of the test results for foundation
analysis and design.
Subsurface conditions are presented in the form of idealized soil profiles
and borehole logs that also include the results of the field and laboratory
tests on soil samples.
Soil-Philippines Index Testing, Inc. undertook the geotechnical
investigation at the site, as well as the laboratory testing on the soil
samples, on November 28 to December 2, 2013.
The geotechnical investigation followed the procedures recommended
by the American Society of Testing and Materials (ASTM).
2.0 PROJECT LOCATION AND REGIONAL GEOLOGY
The proposed project involves the construction of a Power Plant at Brgy.
Guadalupe, Coron, Palawan.
Based on the geologic map of the Philippines, the Coron formation
consists predominantly of limestone with local interbeds of sandstone
and shale or in places, mainly often jointed, light to dark gray, crystalline,
reefal and in places oolitic and conglomerate. It sometimes contains
abundant radiolarian tests (Sphaerellaria and Dictyomitra) and few
pelagic pelecypods indicating an open marine environment.
Page 5
Subsurface Investigation for the Proposed Coron Power Plant
Sitio Tulawa, Brgy. Gudalupe, Coron, Palawan
_______________________________________________________________
________________________________________________________________________________
Geotechnical Evaluation Report
3
Soil was passed through a series of sieves, the weight of soil retained in
each sieve determined and recorded. For each sample analyzed, a
gradation curve was drawn based on the percent finer weight.
Determination of Moisture Content per ASTM D2216
This method covers the laboratory determination of the water (moisture)
content of soil by weight.
The moisture content of a material is defined as the ratio, expressed as
a percentage, of the mass of pore water in a given mass of material to
the mass of the solid material particles.
Atterberg Limit Test per ASTM D4318
This test method covers the determination of the liquid limit, plastic limit,
and the plasticity index of soils.
Liquid Limit of Soils
The liquid limit of a soil is the water content expressed as a percentage
of the weight of the oven-dried soil after attaining the condition between
the liquid and plastic states.
Plastic Limit and Plasticity Index of Soils
The plastic limit of a soil is the water content, expressed as a percentage
of the mass of the oven-dried soil after attaining the condition between
the plastic and semi-solid states.
Plasticity Index is defined as the difference between the liquid and
plastic limits of the soil.
Soil Classification Tests per ASTM D2487
This standard describes a system for classifying mineral and organo-
mineral soils for engineering purposes based on laboratory
determination of particle size characteristics, liquid limit and plasticity
index.
5.0 RESULTS OF FIELD AND LABORATORY TESTING
The results of the subsurface investigation reveal that the site subsoil
generally consists of clay, silt and sand of varying consistency and
relative condition. The upper 2.0 to 5.0 meters are generally composed
of interspersed layers of medium dense sand and stiff to very stiff clay.
Beneath this layer, dense to very dense sand and very stiff to hard clay
were encountered, generally persisting until the termination of the
boreholes.
Subsurface Investigation for the Proposed Coron Power Plant
Sitio Tulawa, Brgy. Gudalupe, Coron, Palawan
_______________________________________________________________
________________________________________________________________________________
Geotechnical Evaluation Report
1
1.0 INTRODUCTION
This report presents the geotechnical evaluation of the results of
subsurface investigations conducted at the site of the PROPOSED
CORON POWER PLANT located within Brgy. Guadalupe, Coron,
Palawan.
The geotechnical investigation consisted of drilling three (3) boreholes
within the site in order to assess the subsoil conditions and evaluate its
characteristics. The soil samples recovered were then brought to the soil
laboratory for analysis and testing. Laboratory tests on selected soil
samples include:
Soil Classification using the USCS (ASTM D2487)
Grain Size Analysis (ASTM D422)
Atterberg Limits (ASTM D4318)
Determination of Moisture Content (ASTM D2216)
This report presents the field and laboratory procedures adopted in the
investigation as well as the evaluation of the test results for foundation
analysis and design.
Subsurface conditions are presented in the form of idealized soil profiles
and borehole logs that also include the results of the field and laboratory
tests on soil samples.
Soil-Philippines Index Testing, Inc. undertook the geotechnical
investigation at the site, as well as the laboratory testing on the soil
samples, on November 28 to December 2, 2013.
The geotechnical investigation followed the procedures recommended
by the American Society of Testing and Materials (ASTM).
2.0 PROJECT LOCATION AND REGIONAL GEOLOGY
The proposed project involves the construction of a Power Plant at Brgy.
Guadalupe, Coron, Palawan.
Based on the geologic map of the Philippines, the Coron formation
consists predominantly of limestone with local interbeds of sandstone
and shale or in places, mainly often jointed, light to dark gray, crystalline,
reefal and in places oolitic and conglomerate. It sometimes contains
abundant radiolarian tests (Sphaerellaria and Dictyomitra) and few
pelagic pelecypods indicating an open marine environment.
Page 5
Subsurface Investigation for the Proposed Coron Power Plant
Sitio Tulawa, Brgy. Gudalupe, Coron, Palawan
_______________________________________________________________
________________________________________________________________________________
Geotechnical Evaluation Report
3
Soil was passed through a series of sieves, the weight of soil retained in
each sieve determined and recorded. For each sample analyzed, a
gradation curve was drawn based on the percent finer weight.
Determination of Moisture Content per ASTM D2216
This method covers the laboratory determination of the water (moisture)
content of soil by weight.
The moisture content of a material is defined as the ratio, expressed as
a percentage, of the mass of pore water in a given mass of material to
the mass of the solid material particles.
Atterberg Limit Test per ASTM D4318
This test method covers the determination of the liquid limit, plastic limit,
and the plasticity index of soils.
Liquid Limit of Soils
The liquid limit of a soil is the water content expressed as a percentage
of the weight of the oven-dried soil after attaining the condition between
the liquid and plastic states.
Plastic Limit and Plasticity Index of Soils
The plastic limit of a soil is the water content, expressed as a percentage
of the mass of the oven-dried soil after attaining the condition between
the plastic and semi-solid states.
Plasticity Index is defined as the difference between the liquid and
plastic limits of the soil.
Soil Classification Tests per ASTM D2487
This standard describes a system for classifying mineral and organo-
mineral soils for engineering purposes based on laboratory
determination of particle size characteristics, liquid limit and plasticity
index.
5.0 RESULTS OF FIELD AND LABORATORY TESTING
The results of the subsurface investigation reveal that the site subsoil
generally consists of clay, silt and sand of varying consistency and
relative condition. The upper 2.0 to 5.0 meters are generally composed
of interspersed layers of medium dense sand and stiff to very stiff clay.
Beneath this layer, dense to very dense sand and very stiff to hard clay
were encountered, generally persisting until the termination of the
boreholes.
