Philippines - Manila Second Sewerage Project : environmental impact assessment (Vol. 17 of 27) : Initial Environmental Examination of Project no. 15 ; Valle Verde (Kaimitoville) BLISS I, Pasig City

Metropolitan Waterworks and Sewerage System Manila Water Company, Inc. E94 Volume 17 Initial Environmental Examination of the Community Sanitation Project Manila Second Sewerage Project IBRD 4019 Project No. 15 Valle Verde Bagong Lipunan Sites and Services I (Kaimitoville) Pasig City, Philippines Prepared by: Manila Water Company, Inc. 489 Katipunan Rd, Balara, Quezon City December 2001 F C  TABLE OF CONTENTS PAGE NO. Executive Summary 7 1.0 PROJECT DESCRIPTION 12 1.1 BASIC PROJECT INFORMATION 12 1.2 PROJECT LOCATION 12 1.3 PROJECT RATIONALE 12 1.4DESCRIPTION OF PROJECT PHASES 16 1.4.1 Pre-Operational/Construction Phase 16 1.4.1.1 Construction Plan 16 1.4.1.2 Total Surface Development Block 19 1.4.1.3 Estimate Total Area to be opened for Civil Works 19 1.4.1.4 Major Openings and Construction Activities 19 1.4.1.5 Types of Equipment to be Used 20 1.4.1.6 Source of Construction Materials and Facilities 20 1.4.1.7 Support Services and Facilities Requirements and Availability 21 1.4.1.8 Estimate of Total Cut Soil Volume 21 1.4.1.9 Total Manpower Requirement 21 1.4.2 Operational Phase 22 1.4.2.1 Project Operation Schedule and Duration 22 1.4.2.2 Process Technology and Activities 22 1.4.2.3 Waste Production Scheme 25 1.4.2.4 Manpower Requirement 25 1.4.3 Abandonment Phase 26 2.0 BASELINE ENVIRONMENTAL CONDITIONS 26 2.1 STUDY METHODOLOGY 26 2.2 LAND 26 2.2.1 Land Resource Utilization 26 2  2.2.3 Vegetation and Wildlife 2.2.4 Land Acquisition Assessment 26 2.3 WATER 2.3.1 Inventory of Water Bodies 2.3.2 Water Quality (Surface/Ground) 28 2.4AIR 28 2.5 PEOPLE 30 2.5.1 Population 2.5.2 Project Affected Persons 30 3.0 PROJECT ALTERNATIVES 4.0 IMPACT ASSESSMENT 30 4.1 IMPACT IDENTIFICATION 30 4.1.1 Impacts During Construction Phase 31 4.1.2 Impact During Operation Phase 32 4.2 IMPACT PREDICTION AND EVALUATION 34 4.3UNAVOIDABLE AND RESIDUAL IMPACTS 35 5.0 ENVIRONMENTAL MANAGEMENT PLAN 35 5.1 IMPACTS MITIGATION / ENHANCEMENT PLAN 35 5.2 ENVIRONMENTAL MONITORING ACTION PLAN 41 6.0 COMMUNITY CONSULTATION PROCESS' 42 3  LIST OF FIGURES 1 Location Map of Kaimitoville 13 2 Existing Sewer Network Layout 15 3 Proposed Implementation Schedule 17 Proposed Sewer Collection Layout and STP Location 5 General Treatment Process Scheme 24 6 Photograph of STP site 26 4  2.2.2 Physiography and Geology 26 2.2.3 Vegetation and Wildlife 2.2.4 Land Acquisition Assessment 26 2.3 WATER 2.3.1 Inventory of Water Bodies 28 2.3.2 Water Quality (Surface/Ground) 2.4AIR 28 2.5 PEOPLE 28 2.5.1 Population 2.5.2 Project Affected Persons 3.0 PROJECT ALTERNATIVES 4.0 IMPACT ASSESSMENT 29 4.1 IMPACT IDENTIFICATION 29 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 34 5.1 IMPACTS MITIGATION / ENHANCEMENT PLAN 34 5.2 ENVIRONMENTAL MONITORING ACTION PLAN 40 6.0 COMMUNITY CONSULTATION PROCESS' 41 3  LIST OF TABLES 1 Analysis of Septic Tank Effluent Quality from 14 Kaimitoville 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 11 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- 04-0217-120 4 Sample Monitoring Sheet for Effluent Quality 5 Manila Water PCO Report Format 6 Endorsement from the Barangay Captain 7 Memorandum of Agreement (MOA) between Kaimitoville Homeowners' Association and Manila Water Company 6  EXECUTIVE SUMMARY The proposed project for Kaimitoville is one of twenty three (23) sub-projects of the Community Sanitation Project Phase I, 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 Marikina / Pasig River by the one hundred eighty (187) residential units within the Kaimitoville compound. The project involves the improvement and rehabilitation of the sewerage system in the compound. Specifically, the project includes the construction of sewer lines to intercept sewage flows from existing communal and individual septic tanks. An underground centralized sewage treatment plant (STP) will be constructed to treat the wastewater flows. Approvals for the project were obtained through a community consultation process. An endorsement letter from the Barangay Council of Barangay Ugong was obtained to facilitate the process. This was followed by a series of meetings with the Homeowners' Association officers and individual unit owners. Finally, a Memorandum of Agreement (MOA) between Manila Water Company and the Homeowners' Association in Kaimitoville was executed. In conformity with the requirements of the Department of Environment and Natural Resources (DENR), an Environmental Compliance Certificate (ECC) NCR-2000-12-11-0263-120 issued pursuant to P.D. 1586 was secured for the project. I. BASELINE ENVIRONMENTAL CONDITIONS Kaimitoville is a government settlement housing project implemented in the 1980s to provide homes for public officials and the less fortunate. The housing project is situated in one of the prime residential areas in Pasig City. It is located along E. Rodriguez Jr. Avenue, Barangay Ugong. Bordering the compound is Las Villas de Valle Verde on the southwest, Landmark Villa I on the northeast and Kaimito Street on the northwest. The Kaimitoville compound has a total land area of 1.5 hectares, 58% of which are residential areas and the rest are parking spaces, playgrounds and common areas. The housing compound is composed of eleven (11) cluster buildings with varying number of units and four (4) two-story walk-up residential buildings, each with sixteen units. 7  Floral population within the compound constitutes ornamental plants and a few fruit trees, which were planted by the residents. Faunal population is limited to household pets. 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. Existing Sewerage System The sewerage system in Kaimitoville consists of Cast Iron Pipe sewer network laid during the development of the area, except for some new pipes, made of Poly-vinyl Cholride (PVC), which were installed by some unit owners who constructed individual septic tanks. The sewer network was originally designed so that wastewater flows will be directed to six (6) communal septic tanks. At present, the sewerage system of Kaimitoville is not maintained. Some of the sewer clean-outs are buried and can be hardly located. Many sewer lines are either clogged or broken and two communal septic tanks frequently overflow because the effluent pipes are clogged. Many residents complain about the high maintenance cost of the communal septic tanks so that some resorted to installing their own septic tanks while others created by-pass lines to discharge directly to the drainage. 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. C02, CO * Provision of properly maintained storage area for keeping stocks of N 0) 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 strict enforcement of health and safety pollution control regulations specific for the project site - Good housekeeping of workplace and construction affected areas - Use of Personal Protective Equipment (PPE) 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 * Formulation of chemical and oil spill clean-up plan * Formulation of a monitoring program * Provision of portable toilets for construction workers to avoid any unauthorized peeing 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 to compound 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. 9  OPERATIONAL PHASE 1.Environmental hazards . Carefully designed post-construction maintenance, contingency due to accidents, man- and monitoring programs made natural disasters * Well designed plan for detection of accident or natural events eg. accidental spills, fire, including precautionary and remedial measures to be observed seismic activity, . Provision of preventive and remedial procedural manuals at earthquakes, heavy workplace rain/flooding and design * Adequate plans for environmental rehabilitation and restoration of failure 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 Effluent discharge) 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 vibration equipment, lift station) . All mechanical/electrical equipment shall be installed inside enclosures . 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 but (generated within the facility 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 appropriate compounds coming from tree species raw wastewater and during . Provision of landscape which will improve the aesthetic of the area desludging of septic tanks) 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 10  Ill. ENVIRONMENTAL MONITORING PLAN Environmental monitoring will be the responsibility of Manila Water Company. _a=le-1111:44 - Construction Phase Compliance with Manila * At STP site and its * On-the-spot inspection and Water Company health and perimeter monitoring will be safety policies (dust * Pipe laying area implemented by the Health emissions, good * Equipment and materials and Safety Dept. of Manila housekeeping, noise, odors) storage area Water Company using the STARRT Card (Annex 1) Traffic * Ingress and egress to * Daily the construction site Operational Phase Effluent Water Quality * Influent * Annex 2 describes in detail for parameters like pH, 5-day * Effluent/Discharge Point the schedule of wastewater BOD, COD, Total coliform, quality monitoring. suspended solids, and oil and grease. Odor * STP site and perimeter * Daily Sludge * AtSTP site * Weekly accumulation/Clogging * Sewer ne . ~~~~* Sewer network * Communal septic tanks  1.0 PROJECT DESCRIPTION 1.1 Basic Project Information Name of Project KAIMITOVILLE, PASIG COMMUNITY SANITATION PROJECT MANILA SECOND SEWERAGE PROJECT Address : Kaimitoville, Kaimito Street, Valle Verde II Barangay Ugong, Pasig City, Philippines 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 1.2 PROJECT LOCATION The proposed project for Kaimitoville 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 Kaimitoville. The project site is in Kaimito Street, Valle Verde II, Barangay Ugong, Pasig City which is easily accessible from either the Julia Vargas Avenue or the E. Rodriguez Avenue. Figure 1 presents the location map of the project 1 2  Figure 1 Location Map 13 _ F 1 DI 13~~~~~~  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 come from domestic discharges. 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 Kaimitoville as shown by the analysis of the effluent of one of the septic tanks in the area (see Table 1 below). In Kaimitoville, all wastewater flows, either from the septic tanks or direct from the households, are discharged to the drainage pipes along Kaimito street and E. Rodiguez Avenue. These flows eventually find their way to the Pasig River. Figure 2 shows the existing sewer network in Kaimitoville. 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 Pasig River. Table 1 Analysis of Septic Tank Effluent Quality from Kaimitoville Limit(s) , Kaimitoville Parameter DENR-EMB Effluent Sample PH 6.5-9 7.3@27.9