Philippines - Manila Second Sewerage Project : environmental impact assessment (Vol. 10 of 27) : Initial Environmental Examination of Project no. 8 ; Maharlika medium rise housing, Taguig, Metro Manila

E94 Volume 10 Metropolitan Waterworks and Sewerage System Manila Water Company, Inc. Initial Environmental Examination of the Community Sanitation Project Manila Second Sewerage Project IBRD 4019 Project No. 8 Maharlika Medium Rise Housing (MRH) Taguig, Metro Manila Prepared by: Manila Water Company, Inc. 489 Katipunan Rd, Balara, Quezon City December 2001 F CY  TABLE OF CONTENTS PAGE NO. Executive Summary 7 1.0 PROJECT DESCRIPTION 1.1 BASIC PROJECT INFORMATION 12 1.2 PROJECT LOCATION 12 1.3 PROJECT RATIONALE 14 1.4DESCRIPTION OF PROJECT PHASES 1.4.1 Pre-Operational/Construction Phase 1.4.1.1 Construction Plan 16 1.4.1.2 Total Surface Development Block 16 1.4.1.3 Estimate Total Area to be opened for Civil Works 16 1.4.1.4 Major Openings and Construction Activities 16 1.4.1.5 Types of Equipment to be Used 19 1.4.1.6 Source of Construction Materials and Facilities 19 1.4.1.7 Support Services and Facilities Requirements and Availability 20 1.4.1.8 Estimate of Total Cut Soil Volume 20 1.4.1.9 Total Manpower Requirement 20 1.4.2 Operational Phase 1.4.2.1 Project Operation Schedule and Duration 21 1.4.2.2 Process Technology and Activities 21 1.4.2.3 Waste Production Scheme 22 1.4.2.4 Manpower Requirement 24 1.4.3 Abandonment Phase 24 2.0 BASELINE ENVIRONMENTAL CONDITIONS 2.1 STUDY METHODOLOGY 2.2 LAND 2 2.1 Land Resouirce I Jtilization 25 2  2.2.2 Physiography and Geology 25 2.2.3 Vegetation and Wildlife 25 2.2.4 Land Acquisition Assessment 27 2.3WATER 2.3.1 Inventory of Water Bodies 27 2.3.2 Water Quality (Surface/Ground) 27 2.4AIR 27 2.5 PEOPLE 2.5.1 Population/Beneficiary 28 2.5.2 Project Affected Persons 28 3.0 PROJECT ALTERNATIVES 28 4.0 IMPACT ASSESSMENT 4.1 IMPACT IDENTIFICATION 4.1.1 Impacts During Construction Phase 30 4.1.2 Impact During Operation Phase 31 4.2 IMPACT PREDICTION AND EVALUATION 33 4.3 UNAVOIDABLE AND RESIDUAL IMPACTS 34 5.0 ENVIRONMENTAL MANAGEMENT PLAN 5.1 IMPACTS MITIGATION / ENHANCEMENT PLAN 34 5.2 ENVIRONMENTAL MONITORING ACTION PLAN 39 6.OCOMMUNITY CONSULTATION PROCESS 40 3  LIST OF FIGURES 1 Location Map of BLC 13 2 Existing Sewer Network Layout 15 3 Proposed Implementation Schedule 17 4 Proposed Sewer Collection Layout 18 5 General Treatment Process Scheme 23 6 Photograph of STP site 26 4  LIST OF TABLES * WA: 0.S .N2 1 1 Typical Analysis of Septic Tank Effluent Quality 14 2 Estimates of Soil Excavation Volumes 20 3 Influent Flow Characteristics 21 4 DENR Effluent Parameters for Class C Waters 22 5 Sources and List of Potential Environmental 29 Impacts 6 Typical Noise Emissions of Construction 31 Equipment at Various Distances from Source in dB(A) 7 Sludge Production of Various Wastewater 32 Treatment Processes 8 Summary of Assessment of Environmental Issues 33 / Impacts 9 Environmental Management Plan 34 10 Environmental Monitoring Action Plan 39 1 1 Institutional Monitoring 40 5  LIST OF ANNEXES 1 Manila Water Company STARRT Card for Monitoring Construction Works 2 Wastewater Quality Monitoring Schedule 3 Environmental Compliance Certificate (ECC) NCR-2000-10- 04-0216-120 4 Manila Water PCO Report Format 5 Sample Monitoring Sheet for Effluent Quality 6 Endorsement from the Barangay Captain 7 Memorandum of Agreement (MOA) between Manila Water Company and the National Housing Authority  EXECUTIVE SUMMARY The proposed project for Maharlika Medium Rise Housing (MRH) is one of the twenty-three (23) sub-projects of the Community Sanitation Project Phase 1, which is a component of the World Bank-assisted Manila Second Sewerage Project (MSSP). The project is intended to reduce the current wastewater pollution discharged to the Laguna Lake by the four hundred and twenty (420) residential units in Maharlika MRH. The project involves the improvement and rehabilitation of the sewerage system in the compound. Specifically, the project includes the installation of sewer lines to intercept sewage flows from existing communal septic tanks as well as raw wastewater flows from buildings without septic tanks. An underground centralized sewage treatment plant (STP) will be constructed to treat the wastewater flows. A Memorandum of Agreement (MOA) between Manila Water Company and the National Housing Authority (NHA) was executed to allow project implementation. In conformity with the requirements of the Department of Environment and Natural Resources (DENR), an Environmental Compliance Certificate (ECC) NCR-2000-10-04-0216-120 issued pursuant to P.D. 1586 was secured for the project. I. BASELINE ENVIRONMENTAL CONDITIONS Maharlika MRH was designed to address the housing requirements of the growing population of Muslims in Metro Manila. It occupies a parcel of land within Maharlika Village in the Muslim community of Barangay Maharlika, Taguig, Metro Manila. Designed in the latter part of 1990s and constructed under the supervision of the National Housing Authority, Maharlika MRH occupies an 11, 418 square meter of gently rolling property on the northeast side of Maharlika Village. The MRH is bounded by Maharlika Road the West and barangay roads in the north and in the east. Completed in 1999, Maharlika MRH consists of seven (7) five-story residential buildings. The 420 residential units in Maharlika MRH shelter an estimated population of 2,940. Income classes in the community range from low to middle. Floral population within Maharlika MRH constitutes ornamental plants and a few trees. Faunal population is limited to household pets and stray animals. The area is characterized by a relatively even distribution of precipitation during the year. Like in most parts of Metro Manila, the community has two distinct seasons: 7  the dry season during the months of November to May and the wet season during the months of June to October. Existing Sewerage System The sewerage system of the 2,940 population of Maharlika MRH is made up of polyvinyl chloride (PVC) sewer pipes with diameters ranging from 150-200 millimeters. The sewer lines collect wastewater flows from the 420 residential units to the septic tanks of each building. From the septic tanks, settled wastewater flows to the municipal drainage system which discharges to the Hagonoy Creek. The Hagonoy Creek ultimately discharges to the Laguna Lake. The current BOD5 of the Laguna Lake ranges from 2-5 mg/L which falls within the BOD5 for Class C waters. DENR Administrative Order 34 (DAO 34) describes Class C water as that suitable for the following: 1. Fishery Water for the propagation and growth of fish and other aquatic resources; 2. Recreational Water Class II (Boating, etc.); 3. Industrial Water Supply Class I (For manufacturing processes after treatment). II. ENVIRONMENTAL IMPACTS AND MITIGATING MEASURES Potential Environmental Mitigating Measures Impact CONSTRUCTION PHASE 1. Poor quality of . Manila Water Company will monitor the supply and installation construction contract to assure quality of equipment and construction. Site Managers and Engineers with experience in construction management shall approve all materials and equipment to be used and installed at the site. . The contractor will be required to post a performance bond for the Design and Construction Contract of the sewerage system. 8  2. Air pollution . Efficient construction planning and work scheduling (suspended particulates, . Formulation of appropriate work plans, work scheduling, work odor and fumes, vehicle specifications and work methodologies emissions eg. CO2, CO . Provision of properly maintained storage area for keeping NO,) stocks of construction materials and equipment . Prompt and fast removal of excavated materials or dredges spoils from construction site . Sprinkling of water on dust-generating mounds of resulting from earthmoving activities and civil works. . Control of motor vehicle emissions . Dust accumulation will.also be prevented through proper washing of the vehicles prior to its departure from the site . Development and enforcement of strict health and safety pollution control regulations specific for the project site - Good housekeeping of workplace and construction affected areas - Use of Protective Gear by all workers 3. Water pollution due to * Provide temporary drain systems and storage facilities for wastewater, oil excavation soils, fuel and oils needed for equipment leakage/spills . Cautious and sensible planning for construction and post- construction phases of the project . Provision of a routine chemical and oil spill clean-up plan . Formulation of a monitoring program 4. Noise pollution from . Establish temporary sound barriers around the work site operation of construction a Proper scheduling and phasing of high-noise activities equipment . Use of appropriate mufflers and sound proofing for construction machinery, equipment and engines . Use of Personnel Protective Equipment by all workers 5. Temporary disruption of . Public information campaign posting schedule of construction traffic flow within the . Provision of a liaison officer from the residents of the compound compound to assist the information dissemination regarding inevitable changes in schedule of operations . Provision of temporary alternative routes, including visible traffic warning signals * To the extent possible, sewer lines, manholes and lift station will be constructed in common areas not used for pedestrian or vehicular traffic . Scheduling of delivery materials and removal of excavated material during non-rush hour periods. OPERATIONAL PHASE 1.Environmental hazards * Carefully designed post-construction maintenance, due to accidents, man- contingency and monitoring programs made and natural disasters . Well designed plan for detection of accident or natural events eg. accidental spills, fire, including precautionary and remedial measures to be seismic activity, observed earthquakes, heavy . Provision of preventive and remedial procedural manuals at rain/flooding and design workplace failure . Adequate plans for environmental rehabilitation and restoration of site and removal of temporary structures and facilities inAtalled during construction phase 9  2. Water Pollution (effluent . Wastewater discharged by the STP shall conform with the discharge) Effluent Standards set forth in DENR Administrative Order 34 and 35 for Class C waters . Regular monitoring of wastewater effluent by the Manila Water Company Central Laboratory . Regular check on sewer lines to prevent discharge/seepage of untreated wastewater to the environment . Quality of civil work on the STP facility shall be enforced during construction to avoid seepage 3. Noise Pollution (STP . Use of appropriate mounting for machinery to minimize equipment, lift station) vibration . All mechanical/electrical equipment shall be installed inside enclosures a If appropriate, motors shall be provided with soundproofing devices . Maintenance of greenbelt zones and vegetation with appropriate tree species 4. Solid Waste * Solid waste generated within the STP facility will be minimal (generated within the facility but provision will be made for garbage collection and by the facility) * Disposal of sludge generated will be in accordance with established procedures of relevant authorities (disposal of sludge for use as soil conditioner) 5. Odors (organic and sulfur . Maintenance of greenbelt zones and vegetation with compounds coming from appropriate tree species raw wastewater and during . Provision of landscape which will improve the aesthetic of the desludging of septic tanks) area by planting green strips using appropriate plant or tree species . Provision of odor control mechanisms (deodorizer/adsorbent/masking agent) to prevent malodorous emissions) 6, Maintenance and . Regular asset condition monitoring by Manila Water Company Operation of the System personnel