Republic of the Philippines DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS REGIONAL OFFICE VI Fort San Pedro, Iloilo City, Iloilo TERMS OF REFERENCE Consulting Services for the Data Gathering, Surveys, and Investigation for the Feasibility Study of the Proposed Bypass Projects in Iloilo 4th DEO 1. Iloilo Circumferential Road 2 (C-2) 2. Iloilo Circumferential Road (C-3) 3. Zarraga-Sta. Barbara –Airport Road 4. Lapayon-Cabugao Norte-Sen. Benigno S. Aquino, Jr. Ave. 1.0 INTRODUCTION The Department of Public Works and Highways (DPWH) is seeking to develop its pipeline of road transport projects nationwide for implementation and/or possible external financial assistance in their implementation. As part of the initial stage in the project development cycle, feasibility studies assessing the technical, economic, environmental, and social impacts of the project are required. The proposed conduct of data gathering, surveys and investigation for the feasibility of these projects is envisaged to be carried out by local consultant to be outsourced by the Planning and Design Division, DPWH Regional Office VI with the assistance of the Project Preparation Division, Planning Service (PPD, PS). The output of the consulting service shall be used for the conduct of feasibility for the proposed Iloilo Circumferential Road 2 (C-2), Iloilo Circumferential Road 3 (C-3), Zarraga-Sta. Barbara-Airport Road and Lapayon-Cabugao Norte-Sen. Benigno S. Aquino, Jr. Ave. The feasibility study is expected to determine the extent and nature of improvements/construction required, the economic and technical justifications thereof and in relation to their environmental and social impacts, and the development of a suitable and optimal investment program. The findings of the Study are intended for use by the DPWH for programming purposes and for its implementation through local financing/external sources if determined to be feasible. 2.0 OBJECTIVES 1. To enhance economic efficiency of abutting major roads which support the rapidly expanding population and urbanization of the Municipalities of Leganes, Oton, Pavia, San Miguel, Sta. Barbara, and Zarraga in the Province of Iloilo; and 2. To serve as one measure of easing the traffic congestion of the relevant road network within the project influence area. Consulting Services for the Data Gathering, Surveys, and Investigation for the Feasibility Study of the Proposed Bypass Projects in Iloilo 4th DEO Page 2 of 17 Specifically, the objective of the Study is to gather technical and socio-economic data needed in the conduct of assessment and evaluation such as: A. Traffic Survey B. Socio-Economic Survey (Ecological Profile, CLUP, CDP, etc) C. Engineering Survey I. Alignment Survey (topographic) II. Geotechnical Investigation III. Hydrological Survey IV. Utilities Survey D. Preliminary Resettlement Action Plan (Preliminary RAP) E. Environmental and Social Impact Assessment 3.0 SCOPE OF CONSULTING SERVICES 3.1 GENERAL The scope of consulting services will involve the data gathering, surveys and investigation to be utilized in the preparation of feasibility study which is the subject of the Terms of Reference (TOR). The Consultant’s scope of work will cover but not necessarily limited to the items listed hereunder. The Consultants will conduct: 1. Traffic Survey and Analysis A. Traffic Survey The Consultant shall undertake the following traffic data gathering: o 12-hour manual counts at identified traffic stations for at least two (2) days consolidated every hour (see Annex 1 & 2) o 12-hour origin-destination survey at identified stations for at least two (2) days consolidated every hour (see Annex 1 & 2) o 24-hour intersection traffic count survey at identified stations for at least two (2) days consolidated every 15 minutes (see Annex 1 & 2 o Travel time survey to determine causes of delay and the average travel speed The Consultant shall analyze and process all traffic data collected and prepare the required data inputs using the prescribed format in Annex 3; The Consultant shall utilize the survey forms provided in Annex 4; Consulting Services for the Data Gathering, Surveys, and Investigation for the Feasibility Study of the Proposed Bypass Projects in Iloilo 4th DEO Page 3 of 17 The Consultant shall adhere to the methodology prescribed in Annex 5; The Consultant shall establish the traffic adjustment factors if there is no available data in DPWH's RTIA 20km from the project area; and The Consultant shall establish the Annual Average Daily Traffic in the relevant road sections for the analysis and evaluation of the project. B. Socio-Economic Survey The Consultant shall undertake the following data gathering for socio- economic analysis: o Collect data, assess and forecast development trends such as population growth and distribution income, extent of urbanization, land area/use, car/vehicle ownership, transportation related expenditures, employment, poverty, etc. in the influence area of the Project; o Assess information on national and regional macro-economic growth development plans and trends and economic sectors (services, industry, manufacturing agriculture, etc.) and how the Project will have impact on these; C. Engineering Surveys The Consultants shall take into consideration the following survey aspects: I. Topographical Survey The Consultants shall identify at least three (3) possible alignments considering the technical, financial, environmental and social aspects of the project; o Present to the Implementing Office and Project Preparation Division, Planning Service (PPD) the three (3) possible alignments and seek approval as to the best alignment; Undertake preliminary topographical survey along the selected alignment. The Consultant shall set out and establish reference points at appropriate locations as key control points Consulting Services for the Data Gathering, Surveys, and Investigation for the Feasibility Study of the Proposed Bypass Projects in Iloilo 4th DEO Page 4 of 17 of the survey. These points shall be used as benchmarks for identification and use during the subsequent engineering surveys. ("Geo-tagging") The leveling shall be tied to the existing Government benchmarks in the area. Cross-sections shall be taken at fifty (50) meters interval, unless local conditions require cross-section at closer intervals so as to provide the necessary details for earthwork, quantity calculations with an accuracy of twenty percent (20%) of the final quantities. Profiles and cross-sections shall be determined plus one hundred (100) meters beyond construction limits. Topographic maps with contours at 50-meter interval and coordinates and vicinity plan shall be prepared by the Consultants. All survey plans shall be prepared on reproducible materials of high quality. River/creek profile and river/creek cross sections shall be surveyed for 500 meters each upstream and downstream sides from the centreline of the bridge. Cross-sections shall be measured at 50-meter interval. The Consultants shall conduct preliminary inventory for potential road slope disasters in the road section under study. The road slope disasters in the road shall be determined and classified as soil collapse, rock slope collapse, landslide, road slip, debris flow, river erosion and coastal erosion. All survey information and data shall be recorded and preserved in standard survey forms and notebooks subject, however, to the review/checking of the Implementing Office. Upon completion of the works, all original survey notes will become property of DPWH. Relative to the data gathered, satisfactory harmony between the horizontal and vertical geometry can be established in complimentary with the existing terrain. II. Geotechnical and Geological survey Review/study the geological conditions in the areas traversed and, on the basis of geotechnical investigations performed (and also utilizing all available data), provide appropriate recommendations and design criteria to permit proper foundation design for roads and bridges; Consulting Services for the Data Gathering, Surveys, and Investigation for the Feasibility Study of the Proposed Bypass Projects in Iloilo 4th DEO Page 5 of 17 Undertake geotechnical investigations including soils and materials survey. The Consultant shall perform analysis and testing on disturbed and undisturbed soil samples, pavement samples as well as construction materials samples. This analysis and testing shall be performed in accordance with AASHTO and ASTM; In particular, the soil samples along the road alignment for pavement design will be conducted with auger borings and test pits for soil classification and CBR (California Bearing Ratio), respectively. Determination shall be conducted at 250 meters interval with minimum depth of 1.50 meters. These will be tested for: o Grain size and classification according to the AASHTO method; and o Atterberg limits, natural moisture content, dry density moisture content relationship and determination of bearing capacity by the CBR test on representative samples of different soil types. At the proposed bridge site, deep drilling with standard penetration test (SPT) at 1.50m interval for fly-over structures shall be conducted at each abutment and 1 or 2 for piers. Drilling shall be at a minimum depth of ten (10) meters and maximum of 20 meters or at least five (5) meters into the hard strata or bedrock. The soil samples for foundation design shall be tested for the determination of the main characteristics (grain size distribution and classification, moisture content,