Philippines - Manila Second Sewerage Project : environmental impact assessment (Vol. 8 of 27) : Initial Environmental Examination of Project no. 6 ; Coryville condominium, Makati City

Metropolitan Waterworks and Sewerage System Manila Water koanpany, InC. E94 Volume 8 Initial Environmental Examination of the Community Sanitation Project Manila Second Sewerage Project IBRD 4019 Project No. 6 Coryville Condominium Makati City, Philippines Prepared by: Manila Water Company, Inc. 489 Katipunan Rd, Balara, Quezon City December 2001 FILE CPY 13  TABLE OF CONTENTS PAGE NO. Executive Summary 7 1.0PROJECT DESCRIPTION 12 1.1 BASIC PROJECT INFORMATION 12 1.2 PROJECT LOCATION 12 1.3PROJECT RATIONALE 13 1.4DESCRIPTION OF PROJECT PHASES 14 1.4.1 Pre-Operational/Construction Phase 14 1.4.1.1 Construction Plan 14 1.4.1.2 Total Surface Development Block 14 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 19 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 21 1.4.2.4 Manpower Requirement 23 1.4.3 Abandonment Phase 23 2.0 BASELINE ENVIRONMENTAL CONDITIONS 24 2.1 STUDY METHODOLOGY 24 2.2 LAND 24 2.2.1 Land Resource Utilization 24 2  2.2.2 Phvsiography and Geology 24 2.2.3 V. getation and Wildlife 24 2.2.4 Land Acquisition Assessment 24 2.3WATER 26 2.3.1 Inventory of Water Bodies 26 2.3.2 Water Quality (Surface/Ground) 26 2.4AIR 26 2.5 PEOPLE 27 2.5.1 Population/Beneficiary 27 2.5.2 Project Affected Persons 27 3.0 PROJECT ALTERNATIVES 27 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 33 5.0 ENVIRONMENTAL MANAGEMENT PLAN 33 5.1 IMPACTS MITIGATION / ENHANCEMENT PLAN 33 5.2 ENVIRONMENTAL MONITORING ACTION PLAN 38 6.0 COMMUNITY CONSULTATION PROCESS' 39 3  LIST OF FIGURES __- __ 1 Location Map of Coryville 13 2 Existing Sewer Network Layout 15 3 Proposed Implementation Schedule 16 4 Proposed Sewer Collection Layout and STP 18 Location 5 General Treatment Process Scheme 22 6 Photographs of STP site 25 4  LIST OF TABLES *_ _ _ -S 1 Estimates of Soil Excavation Volumes 19 2 Influent Flow Characteristics 20 3 DENR Effluent Parameters for Class C Waters 21 4 Sources and List of Potential Environmental 29 Impacts . 5 Typical Noise Emissions of Construction 31 Equipment at Various Distances from Source in ______dB(A) 6 Sludge Production of Various Wastewater 32 Treatment Processes 7 Summary of Assessment of Environmental Issues 33 / Impacts 8 Environmental Management Plan 34 9 Environmental Monitoring Action Plan 39 10 Institutional Monitoring 5  LIST OF ANNEXES 1 Manila Water Company's Safety Task Analysis Risk Reduction Talk(STARRT) Card for Monitoring Construction Works 2 Wastewater Quality Monitoring Schedule 3 Environmental Compliance Certificate (ECC) NCR-2001-06- 25-115-221 4 Manila Water PCO Report Format 5 Sample Monitoring Sheet for Effluent Quality 6 Endorsement from the Mayor of Makati City 7 Endorsement from the Barangay Captain 8 Water and Sewer Service Connection Contract between, MWCI and SAPIKARIN Condominium Corporation  EXECUTIVE SUMMARY The proposed project for Coryville 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 Pasig River by the two hundred and fifty-four (254) residential units within the Coryville 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. Approvals for the project were obtained through consultations with the Homeowners' Association leaders. Endorsement letters from the Mayor of Makati and the Barangay Chairman were also obtained to facilitate the process. A Water and Sewer Service Connection Contract between Manila Water Company and the Homeowners' Association of Coryville (SAPIKARIN Condominium Corporation) was executed. In conformity with the requirements of the Department of Environment and Natural Resources (DENR), an Environmental Compliance Certificate (ECC) NCR-2001-06-25-115-211 issued pursuant to P.D. 1586 was secured for the project. I. BASELINE ENVIRONMENTAL CONDITIONS Coryville Condominium is a housing project implemented by the Corazon Aquino administration to provide homes for the families who were temporarily residing in that area. The Assumpta College, a religious group of nuns, granted use of their land for the Coryville Condominium project. The housing project is located at the end of Eureka St. in Barangay La Paz, Makati City. Surrounding the area are individual houses and a vacant private lot. The Coryville Condominium has a total land area of 2,125 m2, approximately 70% of which are residential structures and the rest are alleys, and common areas. Floral population within the compound constitutes ornamental plants planted by the residents. Faunal population is limited to domestic 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 Coryville Condominium has existing sewer lines, which collect domestic sewage from the units into three (3) underground communal septic tanks located at the center alley of the compound. Effluent from the septic tanks flows to the public storm drainage lines in Eureka St. and eventually finds its way to Pasig River. At present, Pasig River does not meet the Class C standards (i.e., suitable for propagation and growth of fishes, recreational uses and industrial water supply) especially during the summer months when there are no sufficient inflows. At these times, the BOD in Pasig River reaches 120 mg/L, which is 12 times higher than the permitted level for Class C water; DO drops to zero; and total coliforms exceed the MPN/100 ml standard by up to several thousand degrees. The sewerage system of Coryville serving a population of 1,778 has not been maintained. Several manholes are dilapidated. The communal septic tanks are filled with accumulated scum and sludge resulting in the clogging of the storm drainage lines. The top slabs of the septic tanks are deteriorating, allowing infiltration of stormwater and causing release of septic odor. 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 'suspenaceu particulates, * Formulation of a,,prop:iate work plans, work scheduling, work odor and fumes, vehicle specifications ana work methodologies emissions eg. C02, CO v Provision of properly maintained storage area for keeping stocks of N0x) construction materials and equipment I 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 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 . 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 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 working hours . Provision of temporary alternative routes, including visible pedestrian warning signals . To the extent possible, sewer lines and manholes will be constructed in common areas not commonly used for pedestrian 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 9  2. Water Pollution (effluent * Wastewater di0charged by the STr shall conform with the Efiklent charge) Standards set forthi in DENR Admi-istm:.ive Order 34 and 35 for Class C .vaters . 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 . If appropriate, motors shall be provided with soundproofing devices . Maintenance of greenbelt zones and vegetation, if possible, with appropriate plant 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 plant 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 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 netwoFk 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  1X'. ENVIRONMENTAL MONITORING PLAN Environmental monitoriing will be the responsibility of Manila Water Company. m- *1 M#a1~ -S -"77.7"IT _ I 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 . 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 . At STP site . Weekly accumulation/Clogging . Sewer network * Communal septic tanks  1.0 PROJECT DESCRIPTION 1.1 Basic Project Information Name of Project : CORYVILLE CONDOMINIUM COMMUNITY SANITATION PROJECT MANILA SECOND SEWERAGE PROJECT Address : Coryville Condominium, 1888 Eureka St., Barangay La Paz, Makati 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. Fiorelia 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 Coryville is a sub-project of the Community Sanitation Project, which is a component of the World Bank-assisted Manila Second Sewerage Project. The service area is the entire Coryville Compound. The project site is in #1888 Eureka St., Makati City, which is accessible from either the Vito Cruz Extension. Figure 1 presents the vicinity map of the project. 12  Figure 1 Location Map of Coryville Condominium Community Sanitation Project Corywille A 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 inland waters especially Pasig River. The DENR has estimated that around 60% of the pollution load to Pasig River comes 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 Coryville. 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 in the area. Figure 2 shows the existing sewer network in Coryville. 1.4 DESCRIPTION OF PROJECT PHASES 1.4.1 Pre-Operational / Construction Phases 1.4.1.1 Construction Plan The project is scheduled for bidding in December 2001. Construction is expected to commence in April 2002 and project completion is targeted in August 2002 (150 calendar days). Figure 3 shows the implementation schedule for the project. Manila Water Company will undertake the project implementation. 1.4.1.2 Total Surface Development Block The service area is approximately 2,125 m2 and is estimated to have a current population of 1,778. The project will serve all residential and, commercial establishments within Coryville. Any increase in population is not considered because there is no further planned development within the compound that will significantly affect the quality and/or quantity of wastewater discharges. Coryville consists of seventeen (17) two-story walk-up buildings with dormitory- type units. Residential units have floor areas between 10.2 and 13.2 m2. 14  Figure 2 Existing Sewer Network Layout for Coryville Condominium Community Sanitation Project MaTina Water G MH k~~~~~~~~~~~H LC2M M H MH S MH3 1LDO-5 H ~~-~ 0 - OLD -42 _ _ _ _ _ _ _ _ _ _ _ _ 15  Figure 3 Proposed Implementation Schedule for Coryville Condominium Community Sanitation Project Week No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2 Perrr,,mIS and Termporar,, Fieldl __________ ,ocl