Philippines - Manila Second Sewerage Project : environmental impact assessment (Vol. 13 of 27) : Initial Environmental Examination of Project no. 11 ; C5 MRB (Fortville), Taguig, Metro Manila

Metropolitan Waterworks and Sewerage System Manila Water Company, Inc. E94 Volume 13 Initial Environmental Examination of the Community Sanitation Project Manila Second Sewerage Project IBRD 4019 Project No. 11 C5 MRB (Fortville) Taguig, Metro Manila Prepared by: Manila Water Company, Inc. 489 Katipunan Rd, Balara, Quezon City December 2001  TABLE OF CONTENTS PAGE NO. Executive Summary 7 1.0PROJECT DESCRIPTION 1.1 BASIC PROJECT INFORMATION 11 1.2 PROJECT LOCATION 12 1.3PROJECT RATIONALE 12 1.4 DESCRIPTION OF PROJECT PHASES 1.4.1 Pre-Operational/Construction Phase 1.4.1.1 Construction Plan 15 1.4.1.2 Total Surface Development Block 17 1.4.1.3 Estimate Total Area to be opened for Civil Works 17 1.4.1.4 Major Openings and Construction Activities 17 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 1 9 1.4.1.8 Estimate of Total Cut Soil Volume 19 1.4.1.9 Total Manpower Requirement 20 1.4.2 Operational Phase 1.4.2.1 Project Operation Schedule and Duration 20 1.4.2.2 Process Technology and Activities 20 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 Resource Utilization 24 2  2.2.2 Physiography and Geology 25 2.2.3 Vegetation and Wildlife 25 2.2.4 Land Acquisition Assessment 25 2.3WATER 2.3.1 Inventory of Water Bodies 25 2.3.2 Water Quality (Surface/Ground) 27 2.4AIR 27 2.5 PEOPLE 2.5.1 Population/Beneficiary 27 2.5.2 Project Affected Persons 27 3.0 PROJECT ALTERNATIVES 29 4.0 IMPACT ASSESSMENT 4.1 IMPACT IDENTIFICATION 4.1.1 Impacts During Construction Phase 29 4.1.2 Impact During Operation Phase 31 4.2 IMPACT PREDICTION AND EVALUATION 32 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 14 3 Proposed Implementation Schedule 16 4 Proposed Sewer Collection Layout 18 5 General Treatment Process Scheme 23 6 Photograph of STP site 26 4  LIST OF TABLES 1 Typical Analysis of Septic Tank Effluent Quality 15 Estimates of Soil Excavation Volumes 20 3 Influent Flow Characteristics 21 4 DENR Effluent Parameters for Class C Waters 21 5 Sources and List of Potential Environmental 28 Impacts 6 Typical Noise Emissions of Construction 30 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 11 Institutional Monitoring 40  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- 04-0215-120 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 Home Guaranty Corporation (HGC)  EXECUTIVE SUMMARY The proposed project for C5 MRB 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 one thousand one hundred and forty (1,140) residential units in C5 MRB. 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. 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 Home Guaranty Corporation (HGC) will be executed for the project In conformity with the requirements of the Department of Environment and Natural Resources (DENR), an Environmental Compliance Certificate (ECC) NCR-2000-12-22-0265-211 issued pursuant to P.D. 1586 was secured for the project. I. BASELINE ENVIRONMENTAL CONDITIONS Designed in the latter part of 1990s and constructed under the supervision of the Home Guaranty Corporation, C5 MRB occupies 39,992 square meters of property along C5 Road. C5 MRB is bounded by the Pinagsama Village in the west, Pamayanang Diego Silang in the north and east, and C5 Road in the south. The plans for C5 MRB consist of nineteen (19) five-story residential buildings. Presently, seventeen (17) buildings have been constructed and are now partially occupied. Construction of the two other buildings is projected for completion in January 2002. A total of 1,140 residential units in C5 MRB will shelter an estimated population of 7,980. Income classes in the community range from low to middle. Floral population within C5 MRB 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: the dry season during the months of November to May and the wet season during the months of June to October. 7  Existing Sewerage System The sewerage system serving the 7,980 population of the C5 MRB is made up of polyvinyl chloride (PVC) sewer pipes with diameters ranging from 150-200 millimeters. The sewer lines collect wastewater flows from the 1,140 residential units to the septic tanks of each building. From the septic tanks, settled wastewater flows to an unnamed creek which drains 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. 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 constrLuction 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 8  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 * 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 installed during construction phase 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 * If appropriate, motors shall be provided with soundproofing devices * Maintenance of greenbelt zones and vegetation with appropriate tree species 9  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 1 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 . Poor maintenance of * Regular maintenance works for STP equipment (pumps and mechanical equipment motors), sewer network and septic tanks (pumps and motors) . Adequate training of STP operators . Connections * A liaison officer from the Community will assist the STP operator in assuring the facility's efficiency in operation * Provision of adequate maintenance equipment and spares for the sewerage system facility 111. ENVIRONMENTAL MONITORING PLAN Environmental monitoring will be the responsibility of Manila Water Company. Construction Phase Compliance with Manila . At STP site and its * On-the-spot daily Water Company health and perimeter inspection and safety policies (dust a Pipe laying area monitoring will be emissions, good * Equipment and implemented by the housekeeping, noise, odors) materials storage area Health and Safety Dept. of Manila Water Company using the STARRT Card (Annex 1) Traffic . Ingress and egress to * Daily the construction site 10  Operational Phase Effluent Water Quality . Influent . Annex 2 describes in for parameters like pH, 5-day . Samples fronm detail the schedule of BOD, COD, Total coliform, Treatment stages wastewater quality suspended solids, and oil and . Effluent monitoring. grease. Odor . STP site and . Daily perimeter Sludge . At STP site . Weekly accumulation/Clogging . Sewer network * Communal septic tanks 1.0 PROJECT DESCRIPTION 1.1 Basic Project Information Name of Project C5 MRB COMMUNITY SANITATION PROJECT MANILA SECOND SEWERAGE PROJECT Address : C5 MRB, Barangay Western Bicutan, Taguig, Metro Manila Contact Persons Leonor C. Cleofas Manager, Engineering and Project Management Office Metropolitan Waterworks and Sewerage System Ground Floor, Engineering Building, MWSS Complex, Katipunan Road, Balara, Quezon City 1105 Tel No. (632) 920-5413; (632) 920-5521 to 40 locals 3570/3569; Telefax: (632) 922-2568 Ma. Fiorella De Los Reyes-Fabella Wastewater Project Development Manager Manila Water Company, Inc. 489 Katipunan Road, 1105 Balara, Quezon City, Philippines Tel No. (632)981-8147; (632)926-7999 loc2032 Fax (632) 981-8106 l l  1.2 PROJECT LOCATION The proposed project for C5 MRB is a sub-project of the Community Sanitation Project, which is a component of the World Bank-assisted MSSP. The service area is the entire C5 MRB compound. The project site is accessible through C5 Road. Figure 1 presents the vicinity map of the project 1.3 PROJECT RATIONALE In Metro Manila, untreated/partially treated domestic wastewater is the major source of pollution of inland waters. Most residential houses in Metro Manila treat their wastewater by means of septic tanks, which do not provide adequate treatment to satisfy the DENR requirements for wastewater effluent standards. Moreover, majority of septic tanks in Metro Manila is not properly maintained. This situation has led to the deterioration of the Pasig River and other inland waters. The DENR has estimated that around 60% of the pollution load to Pasig River, which empties to Manila Bay and Laguna Lake, come from domestic discharges. In the case of Laguna Lake, 65% of the pollution loading is attributed to domestic waste. There is therefore an urgent need to establish collection and treatment methods that will help reduce the pollution load to inland waters. The provision of an efficient and cost-effective sewage collection, treatment and disposal is the primary objective of the Community Sanitation Project under the MSSP. This project specifically aims to address the problems of inadequate wastewater treatment and disposal in C5 MRB. Figure 2 shows the existing sewer layout in C5 MRB. Inadequate treatment of wastewater in septic tanks is indicated by the typical analysis of the effluent of septic tanks in other project sites (see Table 1 below). The project will help reduce public health risks and environmental pollution from untreated/partially treated domestic wastewater by providing a sustainable sanitation and sewerage facility. It will also serve as a good illustration of proper sanitation especially to the neighboring communities near Laguna Lake. 12  Figure 1. Location Map Project Area Water Bodies 13  Figure 2 Existing Sewer Network Layout for C5-MRB Manila Wate C-5 ROAD1/  Table 1 Typical Analysis of Septic Tank Effluent Quality PH 6.5-9 7.3(c27.9