CADIZ-Figaro Earth Probes Inc. Cadiz, Rodora C. 2012-79606
Proposal for Geotechnical Geotechnical Analysis and Recommendations
I.
Introduction This proposal for consultancy services was made upon the request of XYZ Inc. related to its intent to expand its facilities. CADIZ-Figaro is a professional engineering consultancy company based in Quezon City, whose services are now being offered to undertake the work. The following sections describe the necessary activities to be undertaken to support the Client’s objectives.
II.
Objectives The investigation program aims to characterize t he geologic environment of the three project sites and to determine the most suitable site for each structure with different requirements.
III.
Scope of Proposed Services a. Site reconnaissance i. General geologic conditions are identifies through retrieval of existing data, the interpretation
of
remote-sensing
imagery
and
field
reconnaissance.
Government-prepared data like NAMRIA maps and geological maps from Mines and Geosciences Bureau. b. Geologic assessment i. Lateral distribution and thickness of the soil and rock strata within the zone of influence of the proposed construction/development. ii. Groundwater conditions considering the seasonal changes and the effects of extraction due to construction development. iii. Geological hazards such as landslide/ slope instability due to rainfall or seismic activity, debris flow, liquefaction, ground creep and flooding.
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c.
Soil sampling With the use of Standard Penetration Test, samples may be recovered and tested to determine its properties. Property 1: Quezon City (50m x 30m)
Structure 2-level manufacturing plant
Number of BH 7
2: Pasay City (50m x 30m)
40-storey building with 5 basement levels (Main HQ)
8
3: Marikina (50m x 30m)
5-storey building (Training Center)
5
Depth of BH 15 meters each Aggregate depth of 105 meters 30 meters each Aggregate depth of 240 meters 25 meters each Aggregate depth of 125 meters
During this planning stage, it is recommended to place the structures as tabulated above for the following reasons: a.
Constructing the manufacturing plant in Quezon City minimizes the risk of seismic vulnerability than placing it in Marikina. It also minimizes the risk of settlement due to liquefaction than placing it in Pasay City, near the Manila Bay. Five (5) boreholes is estimated to be adequate coverage to gauge the subsurface profile given its footprint to be 20m x 30m (600 sqm). Though the footprint requires 5 boreholes only, there should also be an investigation uphill and downhill with a minimum of 1 each with the same depth to obtain enough data for the slope stability analysis.
Figure 1. Borehole Location Plan for Quezon City
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b. Constructing the 40-storey Main Headquarters in Pasay City, near the Manila Bay minimizes its seismic vulnerability than placing it in Marikina where the West Valley Fault is nearest. It is also safer in the generally plane topography of Pasay City than the sloping profile of the property in Quezon City. Given that this is a high-rise building, it is assumed to be founded on deep piles which minimize the risk of damage due to liquefaction. Having a requirement for 5 basement levels and assuming the hard strata to be approximately 25 meters below natural surface, it is recommended to investigate 40 meters per borehole or up to 5 meters into the hard strata.
Figure 2. Borehole Location Plan for Pasay City Site
c.
The 5-storey building, given its structural nature and it has less limitations, is to be constructed in Marikina. It is not as heavy as the Main Headquarters and it is not sensitive to settlements. The footprint requires 5 boreholes and since the clay layer is approximated to be 25 meters deep, the depth of the investigation should be at least 25 meters and or up to 5 meters into the hard strata. It will be analysed for the use of mat foundation and pile foundation.
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Figure 3. Borehole Location Plan for Marikina Site
d. Laboratory testing i. Soil classification ii. Natural Moisture Content Test iii. Grain Size Analysis iv. Atterberg’s Limit Test v. Consolidation Test vi. Moisture Density Relation Test e. Geotechnical Analysis From the laboratory test results, soil strength parameters will be extracted and correlated to accepted empirical standards. The following analysis will be done: Property
1: Quezon City 2: Pasay City 3: Marikina
Bearing Capacity
Slope Stabilization Analysis
Settlement
Liquefaction
Seismic Analysis
Pile Capacity Analysis
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IV.
Project Duration and Deliverables Activity
Week 1
2
3
4
5
6
7
8
9
10
11
12
Mobilization Drilling Laboratory Testing Geological Assessment Geotechnical Assessment Submission of Final Report
V.
Professional Fees and Terms of Payment Breakdown of Costs and Fees Item
I. II. III. IV. V. VI. VII.
Geologic Assessment Mobilization/Demobilization Drilling thru soil Drilling thru rock Hole to hole move Printing of report Laboratory tests
UOM
Qty
Unit Cost
site site m m no. no. lot
3 3 365 105 15 3 1
100,000.00 10,000.00 1,500.00 2,000.00 3,000.00 30,000.00 189,375.00 TOTAL
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Cost
Php
300,000.00 30,000.00 547,500.00 210,000.00 45,000.00 90,000.00 189,375.00 1,411,875.00
