Philippines - Manila Second Sewerage Project : environmental impact assessment (Vol. 20 of 27) : Initial Environmental Examination of Project no. 18 ; Mandaluyong medium rise housing, Mandaluyong

Metropolitan Waterwor'!s and Sewerage Systern Manila Water Compariy, Inc. E94 Volume 20 Initial Environmental Examination of the Community Sanitation Project Manila Second Sewerage Project IBRD 4019 Project No. 18 Mandaluyong Medium Rise Housing (MRH) Mandaluyong City, Philippines Prepared by: Manila Water Company, Inc. 489 Katipunan Rd, Balara, Quezon City December 2001 |~C 0t P  TABLE OF CONTENTS PAGE NO. Executive Summary 7 1.OPROJECT DESCRIPTION 11 1.1 BASIC PROJECT INFORMATION 11 1.2 PROJECT LOCATION 12 1.3 PROJECT RATIONALE 12 1.4DESCRIPTION OF PROJECT PHASES 15 1.4.1 Pre-Operational/Construction Phase 15 1.4.1.1 Construction Plan 15 1.4.1.2 Total Surface Development Block 15 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 20 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 22 1.4.3 Abandonment Phase 24 2.OBASELINE ENVIRONMENTAL CONDITIONS 24 2.1 STUDY METHODOLOGY 24 2.2 LAND 24 2.2.1 Land Resource Utilization 24 2  2.2.2 Physiography and Geology 24 2.2.3 Vegetation and Wiidlife 25 2.2.4 Land Acquisition Assessment 25 2.3WATER 25 2.3.1 Inventory of Water Bodies 25 2.3.2 Water Quality (Surface/Ground) 27 2.4AIR 27 2.5 PEOPLE 27 2.5.1 Population 27 2.5.2 Project Affected Persons 27 3.0 PROJECT ALTERNATIVES 28 4.0 IMPACT ASSESSMENT 28 4.1 IMPACT IDENTIFICATION 28 4.1.1 Impacts During Construction Phase 29 4.1.2 Impact During Operation Phase 30 4.2 IMPACT PREDICTION AND EVALUATION 32 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 39 6.0 COMMUNITY CONSULTATION PROCESS' 40 3  LIST OF FIGURES 1 Location Map of Mandaluyong MRH 13 2 Sewer Network Layout 14 3 Proposed Implementation Schedule 16 Proposed Sewer Collection Layout and STP 4 ~~~~~~~~~~~~~18 Location 5 General Treatment Process Scheme 23 6 Photographs of STP Site 26 4  LIST OF TABLES 1 Typical Analysis of Septic Tank Effluent Quality 15 2 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 31 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 Manila Water PCO Report Format 4 Sample Monitoring Sheet for Effluent Quality 5 Endorsement from the National Housing Authority (NHA) 6 Memorandum of Agreement (MOA) between NHA and Manila Water Company (MWCI) 6  EXECUTIVE SUMMARY The proposed project for Mandaluyong 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 Pasig River by the one hundred and eighty (180) residential units within the Mandaluyong MRH 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 septic tanks. An underground-centralized sewage treatment plant (STP) will be constructed to treat the wastewater flows. Approval for the community sanitation project will come from the National Housing Authority, the housing agency responsible for the construction of the housing project. An endorsement letter from the city of Mandaluyong, the donor of the land whereon the housing project is constructed, will be obtained. A Memorandum of Agreement (MOA) between NHA and MWCI is currently being processed. In conformity with the requirements of the Department of Environment and Natural Resources (DENR), an Environmental Compliance Certificate (ECC) pursuant to P.D. 1586 is being secured for the project. I. BASELINE ENVIRONMENTAL CONDITIONS Mandaluyong MRH is a housing project currently being implemented by the City of Mandaluyong and the NHA to provide homes for the less fortunate residing near the area. The housing project is situated in Lot-2-B-2A Rt. Rev. G. Aglipay St., Barangay New Saniga, Mandaluyong City, Metro Manila. Surrounding the area are industrial and residential establishments. Bellajama Townhomes, a private subdivision, is located on the right side of Mandaluyong MRH while Universal Motors Corp. is located on the left side. In front of Mandaluyong MRH is the Mandaluyong Coliseum. The housing project is still under construction and is scheduled for completion in February 2002. The Mandaluyong MRH compound occupies a total land area of 3,000 m2, 40.5% of which are residential areas and the rest are parking spaces, driveways and common areas. 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 design of the sewerage system in Mandaluyong MRH includes sewer lines which will collect wastewater from the buildings into three (3) large communal septic tanks (i.e., one septic tank per building). Two septic tanks are located between Building 1 and 2 while the other is at the end of the driveway beside Building 3 (Figure 3). Effluent from the septic tanks will be discharged into the public storm drainage lines in Rt. Rev. G. Aglipay Street. The effluent from the communal septic tanks will ultimately find its way to the nearby creek going to San Juan River and to Pasig River. Septic tanks are widely used in Metro Manila as means of treating wastewater, however, effluent quality from septic tanks does not comply with Effluent Standards set forth in DENR Administrative Order 34 and 35 for Class C waters (i.e., suitable for propagation and growth of fishes, recreational uses and industrial water supply). 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. C02, 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 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 wastev/ater, oil excavation soils, fuel and oils needed for equipment leakage/spil!s * 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 * Quality of civil work on the STP facility shall be enforced during construction to avoid seepage 4. Noise pollution from . Establish temporary sound barriers around the work site operation of construction . Proper scheduling and phasing of high-noise activities I equipment . Use of appropriate mufflers and sound proofing for construction machinery, equipment and engines l 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 vehicular 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, 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 9  3. Noise Pollution (STP . Use of appropriate mounting for machinery to minimize vibration equipment, lift stat,on) . All niechanical/electrical equipmeni shall be installed inside enclosures . 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 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 Ill. ENVIRONMENTAL MONITORING PLAN Environmental monitoring will be the responsibility of Manila Water Company. is 5- NEE -11-7 S .i1- Construction Phase Compliance with Manila . At STP site and its * On-the-spot daily inspection Water Company health and perimeter and monitoring will be safety policies (dust . Pipe laying area implemented by the Health emissions, good * Equipment and materials and Safety Dept. and/or Site housekeeping, noise, odors) storage area Manager of' Manila Water Company using the STARRT Card (Annex 1) Traffic a Ingress and egress to * Daily the construction site 10  Operational Phase Effluent Water Quality . Influent . Annex 2 describes in detail Effluent Water Qality 0 Influentthe schedule of wastewater for parameters like pH, 5-day . Effluent/Discharge Point quality monitoring. BOD, COD, Total coliform, suspended solids, and oil and grease. Odor . STP site and perimeter . Daily Sludge . At STP site a Weekly accumulation/Clogging . Sewer network . Communal septic tanks 1.0 PROJECT DESCRIPTION 1.1 Basic Project Information Name of Project MANDALU.YONG MRH COMMUNITY SANITATION PROJECT MANILA SECOND SEWERAGE PROJECT Address : Mandaluyong Medium Rise Housing, Rt. Rev. G. Aglipay St., Barangay New Saniga, Mandaluyong City, Metro Manila, 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 11  1.2 PROJECT LOCATION The proposed project for Mandaluyong MRH is a sub-project of the Community Sanitation Project and component of the World Bank-assisted Manila Second Sewerage Project. The service area is the entire Mandaluyong MRH. The project site is in Rt. Rev. G. Aglipay St. (formerly Blumentritt Extension), Mandaluyong City, which is easily accessible from Bonifacio Avenue. Figure 1 presents the location 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 inland waters and especially Pasig River. The DENR has estimated that around 60% of the pollution loads 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 inadequate provision for wastewater treatment and disposal in Mandaluyong MRH. Figure 2 shows the sewer network layout plan based on the original NHA design for the Mandaluyong MRH. Table 1 below shows the typical analysis of septic tank effluent quality. The project will help reduce public health risks and environmental pollution from 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. 12  Figure 1 Location Map of Mandaluyong MRH