Environmental and Social Due Diligence Report
Total Page:16
File Type:pdf, Size:1020Kb
NMCG KMDA PPP Design and Transaction Support for Development of Sewage Treatment Plants (STPs) and integration of existing STPs in Howrah in the state of West Bengal Environmental and Social Due Diligence Report July 2019 PPP design and transaction advisory support for development of STPs in Howrah Environmental and Social Safeguard Due Diligence Report ENVIRONMENTAL AND SOCIAL SAFEGUARD DUE DILIGENCE REPORT FOR DEVELOPMENT OF STPS IN HOWRAH – BALLY, HOWRAH AND BARANAGAR 1. INTRODUCTION Increasing population, haphazard urbanization and industrial growth in Ganga river basin has resulted in high pollution level in economically and culturally important river Ganga. The Government of India (GoI) has established the National Ganga River Basin Authority (NGRBA) for comprehensive management of the river. The NGRBA program will adopt a river basin approach and has been given multi-sectoral mandate to address both water quantity and quality aspects. The NGRBA is implementing the program with financial assistance from The World Bank in five major states (Uttarakhand, Uttar Pradesh, Bihar, Jharkhand and West Bengal) along the main stem of Ganga. Under Namami Gange programme a holistic approach has been adopted to clean the river. Under this program a major initiative has been taken to develop an adequate sewage treatment infrastructure in Bally, Howrah and Baranagar to keep Ganga clean which will be implemented by Kolkatta Metropolitan Development Authority (KMDA), a company owned by Government of West Bengal (GoWB) to implement and accelerate urban infrastructure projects in the State. This report presents the major findings of the Environmental and Social safeguard due diligence exercise carried out for Sewerage and STP Scheme at Bally, Howrah and Baranagar, following the principles of ESMF of Namami Gange. 2. PROJECT BACKGROUND The proposed project aims effective abatement of pollution of river Ganga by developing Sewage Treatment Plants (STPs) and integration of existing STP’s including sewage collection, disposal system using laterals, branches and trunk mains in Howrah city in West Bengal State, India. This project consists of five sub projects as mentioned below 1. Sub Project 1 - Bally 2. Sub Project 2 - Howrah 3. Sub Project 3 - Baranagar 2 PPP design and transaction advisory support for development of STPs in Howrah Environmental and Social Safeguard Due Diligence Report 3. Sub Project 1 - Bally 3.1. PROJECT BACKGROUND AND DESCRIPTION OF PROJECT COMPONENTS Bally is a municipality located in Howrah District. The Bally Municipality, established in 1883, was the body responsible for the civic infrastructure and administration of the northern suburbs of the city of Howrah. Headquartered in the town of Bally, it administers an area of 11.81 square kilometers (4.56 sq mi). Bally town (220-35'-30" North Latitude and 88º-21'-0" East Longitude) comprising Bally, Belur and Lilluah area is situated on the western bank of river Ganga in Howrah District and is bounded by Uttarpara Municipality on the north, Pacha khal on the south, Bally Gram Panchayat, Anandanagar Gram Panchayat and Durgapur- Avaynagar Gram Panchayat on the west and river Ganga on the east. On one side of Bally town there is Vivekananda Bridge (Old Bally Bridge) and Nivedita Setu, by the side of Vivekananda Bridge connects Bally to Barrackpore and Kolkatta on the other side of river Hoogly. As per the Population census of India, the No. of wards in municipality area were 25, 29 and 35 wards for the years 1991, 2001 and 2011 respectively. The Bally Municipality was de-established on 10 July 2015 and part of 35 wards of the municipality was merged with the Howrah Municipal Corporation and they were delimited to 20 wards. Though the bally municipality has been merged with Howrah Municipal Corporation, for the purpose of this technical evaluation report, the No. of wards as appearing in the 2011 population census reports i.e. 35 wards are taken into consideration. There is no planned sewerage system in the town except an Interception and Diversion gravity sewer of diameters ranging from 300 mm to 1000 mm of RCC, CI covering a length of about 8.608 km and 2.716 km of rising main constructed under GAP. However, significant waste water discharge is still into river Hooghly through seven drains. 3 PPP design and transaction advisory support for development of STPs in Howrah Environmental and Social Safeguard Due Diligence Report Figure 3. 1:: Map showing the Bally Municipality area with the revised ward boundaries after merger with Howrah Municipal Corporation 3.2. Drains / outfall within the project area As seen from the Figure 3.2, 7 (Seven) major drains from Bally and Belur area discharge to Ganga whereas 1 (one) major drain from Liluah area discharges to channel B.C. no. 2. Details of drains discharging into River Ganga and site visit photos are provided in Annexure- 2 4 PPP design and transaction advisory support for development of STPs in Howrah Environmental and Social Safeguard Due Diligence Report Figure 3.2: Map showing the wastewater outfalls, drains, LS / PS and STP in Bally 3.3. Baseline details 3.3.1. Existing sewage treatment plants Table 3.1: Details of existing STPs Existing / Year of Location Construction Capacity Technology Remarks installation / Proposed During site visit, 3 – Pond the STP was Kona 1995 Existing 30 MLD type WSP observed to be functional Source: Condition Assessment Report for Sewerage Network and STPs in Bally Town, West Bengal under Namame Gange programme, West Bengal 5 PPP design and transaction advisory support for development of STPs in Howrah Environmental and Social Safeguard Due Diligence Report • STP component details Table 3.2: Details of STP components Pond type Nos. Water area (in Ha) Depth(m) Detention time Anaerobic pond (A.P) 2 1.4 2 1 day Facultative pond (F.P) 2 7.9 1.8 4 days Maturation pond (M.P) 2 6 1.5 3 days Total area 15.3 Ha Source: Condition Assessment Report for Sewerage Network and STPs in Bally Town, West Bengal under Namame Gange programme, West Bengal 3.3.2. Pumping stations There are 3 nos. pumping stations designated as lifting station (LS) in Bally area and 2 nos. in part Howrah area and a common main pumping station (MPS) at Kona in Panchayat area. Besides there is a LS at Hanuman Jute Mill which flows from both Bally and North Howrah are collected and pumped to Kona STP through Pacha Khal (BC No. 3/2). Thus, total Lift stations become 6 (six) in number. 3.3.3. Treated water quality Table 3.3: Details of sewage quality Analysis results of STP as on 25.06.2009 Parameters Remarks Raw Treated sewage effluent Temperature, °C 28 30 The input quality at STP is pH at corresponding already diluted due to 6.87 7.38 temp mixing of storm water and Total solids (mg/l) 592 116 irrigation water through Suspended solids (mg/l) 176 38 canal. BOD is reduced to BOD, 5 day at 20°C 30% from the raw sewage 57 18 (mg/l) quality. COD (mg/l) 94 56 Source - KMDA 6 PPP design and transaction advisory support for development of STPs in Howrah Environmental and Social Safeguard Due Diligence Report Though the parameters of the treated water are considered to be within the prescribed norms, as the test report shared by KMDA officials are dated more than 8 years ago, the same is required to be validated as on date by the concessionaire for necessary corrective action if any during operation stage. 3.3.4. Sewage flow The proposed STP capacity and sewer network is designed for adequate capacity considering population increase over next 15 years and sewage generation norms. STP is designed with standard units suitable to meet the required treated sewage standards for discharge to inland waters. The projected sewage generation for Bally is given below. Table 3.4: Sewage generation Sewage generation (Average Sl. Municipality flow in MLD) as per DPR No. 2020 2035 2050 1 Bally area through I&D works 26.13 30.33 34.52 2 Bally area through BC no. 2 3 Gadhadhar Bhattacharya Road drain 8.92 10.52 11.79 discharging to Channel BC No. 2 from Howrah area 4 Howrah (MC) part 7.96 10.64 12.97 Total required capacity of STP (in MLD) 43.01 62.72 71.20 3.3.5. Proposed Activities • Construction, Operations & Maintenance of one 40 MLD STP in Bally • Operation and maintenance of one existing 22 MLD STP in Bally • Rehabilitation and Operations & Maintenance of one 70 MLD MPS at Bally • Rehabilitation and operations & maintenance of 6 existing SPS at Bally • Construction, Operations & Maintenance of 7 I&D structures • Rehabilitation and operations & maintenance of 7 I&D structures • Replacement of gravity main sewer line of 3.5 km • Replacement of rising main sewer line of 1.3 km in Bally • Replacement of effluent discharge line – 200 m 7 PPP design and transaction advisory support for development of STPs in Howrah Environmental and Social Safeguard Due Diligence Report Figure 3.3: Process requirements and design criteria of sewerage work in Bally 8 PPP design and transaction advisory support for development of STPs in Howrah Environmental and Social Safeguard Due Diligence Report 3.4. STATUS OF ENVIRONMENTAL AND SOCIAL ASSESSMENT No separate environmental assessment specific to the sub-project was carried out at DPR (Detailed Project Report) stage. DPRs are also doesn’t integrate environmental management aspects into the design also no social impact assessment (SIA) was carried out for the project 3.5. ENVIRONMENTAL AND SOCIAL PROFILE OF THE AREA 3.5.1. Socio economic status The site for the proposed new STP is fixed within the campus of the low cost existing STP.