Philippines - Manila Second Sewerage Project : environmental impact assessment (Vol. 22 of 27) : Initial Environmental Examination of Project no. 20 ; UP Diliman, Quezon City

Metropolitan Waterworks and Sewerage System Manila Water Company, Inc. E94 ____________________________________ Volume 22 Initial Environmental Examination of the Community Sanitation Project Manila Second Sewerage Project IBRD 4019 Project No. 20 University of the Philippines, Diliman Quezon City, Philippines Prepared by: Manila Water Company, Inc. 489 Katipunan Rd, Balara, Quezon City December 2001 frILE COPY  TABLE OF CONTENTS PAGE NO. Executive Summary 7 1.OPROJECT DESCRIPTION 11 1.1 BASIC PROJECT INFORMATION 11 1.2PROJECT LOCATION 11 1.3PROJECT RATIONALE 14 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 16 1.4.1.3 Major Openings and Construction Activities 18 1.4.1.4 Types of Equipment to be Used 20 1.4.1.5 Source of Construction Materials and Facilities 20 1.4.1.6 Support Services and Facilities Requirements and Availability 20 1.4.1.7 Estimate of Total Cut Soil Volume 20 1.4.1.8 Total Manpower Requirement 21 1.4.2 Operational Phase 21 1.4.2.1 Project Operation Schedule and Duration 21 1.4.2.2 Process Technology and Activities 22 1.4.2.3 Waste Production Scheme 23 1.4.2.4 Manpower Requirement 25 1.4.3 Abandonment Phase 25 2.01BASELINE ENVIRONMENTAL CONDITIONS 25 2.1 STUDY METHODOLOGY 25 2.2 LAND 25 2.2.1 Land Resource Utilization 25 2.2.2 Physiography and Geology 26 2  2.2.3 Vegetation and Wildlife 26 2.2.4 Land Acquisition Assessment 29 2.3WATER 2.3.1 Inventory of Water Bodies 29 2.3.2 Water Quality (Surface/Ground) 29 2.4AIR 31 2.5 PEOPLE 31 2.5.1 Population/Beneficiary 31 2.5.2 Project Affected Persons 31 3.0 PROJECT ALTERNATIVES 31 4.0 IMPACT ASSESSMENT 32 4.1 IMPACT IDENTIFICATION 32 4.1.1 Impacts During Construction Phase 33 4.1.2 Impact During Operation Phase 35 4.2 IMPACT PREDICTION AND EVALUATION 37 4.3 UNAVOIDABLE AND RESIDUAL IMPACTS 38 5.0 ENVIRONMENTAL MANAGEMENT PLAN 38 5.1 IMPACTS MITIGATION / ENHANCEMENT PLAN 38 5.2 ENVIRONMENTAL MONITORING ACTION PLAN 44 6.0 COMMUNITY CONSULTATION PROCESS 45 3  LIST OF FIGURES 1 Location Map of UP Diliman Campus 12 2 Service Area of Project 13 1 Broken Sewer Pipes Discharging Raw 3 15 Wastewater to the Environment 4 Project Implementation Schedule 17 Conceptual Design of STP and Effluent 5 1 9 Collection Pond 6 General Treatment Process Scheme 24 Land Use Plan for the Science and Technology 27 7 2 Park 8 Photograph of STP site 28 9 UP Diliman to Pasig River 30 4  LIST OF TABLES '* 1 Analysis of Wastewater Discharge from Broken 14 Sewer Lines in UP Campus 2 Estimate of Total Cut Soil Volume 21 3 Influent Flow Characteristics 22 4 ' DENR Effluent Parameters for Class C Waters 22 5 Sources and List of Potential Environmental 32 Impacts 6 Typical Noise Emissions of Construction 34 Equipment at Various Distances from Source in dB(A) 7 Sludge Production of Various Wastewater 36 Treatment Processes 8 Summary of Assessment of Environmental Issues 37 / Impacts 9 Environmental Management Plan 39 10 Environmental Monitoring Action Plan 44 1 1 Institutional Monitoring 45 5  LIST OF ANNEXES 1 Manila Water Company STARRT Card for Monitoring Construction Works 2 Wastewater Quality Monitoring Schedule 3 Sample Monitoring Sheet for Effluent Quality 4 Manila Water PCO Report Format 5 Endorsement Letter from UP Chancellor 6 Endorsement Letter from Barangay Captain 7 Draft Memorandum of Agreement  EXECUTIVE SUMMARY The proposed project for the University of the Philippines (UP) Diliman Campus 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 Setverage Project (MSSP). The project involves the construction of a centralized sewage treatment plant (STP) which will treat the wastewater discharges of the academic and non- academic buildings and residential houses within the UP Diliman Campus. The STP will be located in a 0.5 hectare lot within a 4.28 hectare lot in the vicinity of the National Hydraulics Research Center. The STP will have a capacity to treat 7,000 cubic meters of wastewater per day. A 750-meter sewer line with a diameter of 36 inches will serve as connecting pipe from the existing sewer system to the new STP. The sewage will be treated to achieve final effluent standards for Class C inland waters as stated in the Department of Environment and Natural Resources Administrative Order (DAO) Number 35. An ornamental pond will also be constructed around the STP which will receive treated effluent from the STP. During the dry season, portions of the effluent collected in the pond will be pumped via a 1.5 kilometer main to the lagoon adjacent to the UP Administration Building. In conformity with the requirements of the Department of Environment and Natural Resources (DENR), an Environmental Compliance Certificate (ECC) is also being secured for the project. I. Baseline Environmental Conditions The UP Diliman Campus occupies 493 hectares of gently rolling terrain. The campus is bounded by the Central Avenue extension (formerly the Barangay Culiat boundary line) in the north, Loyola Heights Subdivision in the south, Katipunan Road and Barangay Pansol in the east, and Culiat Creek and UP Village in the west. In the northwestern side, the campus is traversed by the Commonwealth Road. UP Diliman has a student population of around 28,000, a faculty population of nearly 1,700, and a support staff of close to 3,000. There are a total of 79 buildings in the campus and an estimated 4,000 residential units. The sewerage system in the UP Diliman Campus consists of a sewer network of around 16.1 kilometers which was laid in two phases: the first phase was laid in the mid-1960s and the second in the early 1980s. The sewer network was designed so that all wastewater flows will be directed to a centralized STP. However, the plan to construct a centralized STP was not implemented so that 7  broken portions of the sewer lines now discharge raw wastewater to the Culiat Creek and other buildings constructed their own septic tanks. Culiat Creek finds its way to the Pasig River through the San Francisco and San Juan Rivers. 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. II. Environmental Impacts and Mitigating Measures Potential Mitigating Measures Environmental Impact CONSTRUCTION PHASE 1. Change in landform . Restoration of disturbed land when possible (land leveling, road . Planting of trees/plants in the perimeter of the STP and construction, uprooting collection pond of vegetation) . Landscape design will consider maintaining the existing trees i 2. Air Pollution . Proper scheduling and phasing of high-dust activities (dust emissions from . Regular and adequate sprinkling of water on dust-generating civil works/vehicles) mounds/piles resulting from earthmoving activities and civil works . Provision of adequately and properly maintained storage area for keeping stocks of construction materials and equipment . Prompt removal of excavated materials from construction sites and workplaces . Good housekeeping according to Manila Water Company standards for all construction areas . Use of personnel protective equipment by all workers 3. Noise pollution . Proper scheduling and phasing of high-noise activities (operation of . Use of mufflers and sound proofing for construction construction equipment) machineries and equipment . Use of personal protective equipment by all workers 8  4. Temporary disruption of . Coordination with UP Diliman Police Department (Security traffic flow Office and Traffic Enforcement Office) (excavation works for . Public information campaign interconnection to sewer . Clear directional signs and barriers in case traffic rerouting is lines) needed 5. Accumulation of solid . Hauling and proper disposal of waste construction materials waste in construction by contractor, supervised by Manila Water Company site . Provision of temporary toilet facilities for workers OPERATIONAL PHASE 1. Water Pollution * Regular monitoring of wastewater quality from wet well to the (effluent discharges to effluent in the collection pond (compliance with DAO 35) by Culiat Creek. the Manila Water Company Central Laboratory groundwater . Regular check on sewer lines to prevent contamination of contamination from ground water broken sewer lines) 2. Odor emissions from * Proper ventilation and odor control systems for high-risk STP areas in the STP (wet well, digestive chambers, sludge drying beds) l Regular hauling of dried sludge from STP to designated disposal area (for use as soil conditioner) * Landscape design of collection pond and open spaces to improve aesthetic area surrounding the STP l Provision of odor control mechanisms (deodorizer/adsorbent/masking agent) to prevent malodorous emissions) 3. Noise pollution . Use of soundproofing systems/housing for high-noise (STP equipment) equipment (blowers); noise will not be louder than 55db at the STP site boundary * Use of personnel protective equipment by all STP workers, visitors 4. Physical hazards . Fence enclosure, appropriate warning signs and lighting (collection pond, open around the STP site aeration tanks and * Safety precautions such as lighting and warning signs around sedimentation basins) the collection pond . Use of personnel protective equipment by all STP workers, visitors . Appropriate landscape design of collection pond and open spaces 5. Poor O&M of the STP * Regular asset condition monitoring by Manila Water and sewer network Company personnel * Regular maintenance works for STP equipment (pumps and motors) and sewer network 9  Ill. Environmental Monitoring Plan Construction Phase.l Compliance with Manila Water . At STP site and its * On-the-spot inspection Company health and safety perimeter and monitoring will be policies (dust emissions, good . Pipe laying area implemented by the Health housekeeping, noise, odors) * Equipment and and Safety Dept. of Manila materials 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 for parameters like pH, 5-day EffluenDischarge e2 describes in detail BOD, COD, Total coliform, Point wastewater quality suspended solids, and oil and grease. monitoring. Daily Odor * STP site and perimeter . Weekly Sludge accumulation/Clogging . At STP site. . Sewer network * Septic tanks 10  1.0 PROJECT DESCRIPTION 1.1 Basic Project Information Name of Project :UNIVERSITY OF THE PHILIPPINES, DILIMAN, QUEZON CITY COMMUNITY SANITATION PROJECT MANILA SECOND SEWERAGE PROJECT Address . University of the Philippines Diliman, Quezon City 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 UP Diliman campus is located in Quezon City. It is bounded by the Central Avenue extension (formerly the Barangay Culiat boundary line) in the north, Loyola Heights Subdivision in the south, Katipunan Road and Barangay Pansol in the east, and Culiat Creek and UP Village in the west. In the northwestern side, the campus is traversed by the Commonwealth Road. A location map showing the UP Diliman Campus is shown in Figure 1. The STP will be located in a 0.5 hectare lot in the vicinity of the National Hydraulics Research Center. The STP will treat discharges from all buildings in the campus, Area 1, 2, and 3, Doha Aurora, Employees Village, Area 14 and 17, Hardin ng Rosas, and Hardin ng Bougainvillea. Figure 2 shows the service area of the project.  Figure 1