Proposed Expansion of Residential Complex at 272, Sripur Bagherghol Sonarpur, South 24 PGs Form – IA Developer – Prudent Infrarealty Pvt. Ltd. & Others
FORM – IA (Only for construction projects listed under item 8 of the schedule)
CHECKLIST OF ENVIRONMENTAL IMPACTS (Project proponents are required to provide full information and wherever necessary attach explanatory notes with the Form and submit along with proposed environmental management plan & monitoring programme)
1. LAND ENVIRONMENT (Attach panoramic view of the project site and the vicinity)
1.1 Will the existing landuse get significantly altered from the project that is not consistent with the surroundings? (Proposed landuse must confirm to the approved Master Plan / Development Plan of the area. Change of landuse if any and the statutory approval from the competent authority to be submitted). Attach Maps of (i) site location, (ii) surrounding features of the proposed site (within 500 meters) and (iii) the site (indicating levels & contours) to appropriate scales. If not available attach only conceptual plans.
Ans: The proposed project is of expansion of an ongoing development of a residential complex over the land of M/s Prudent Infrarealty Pvt. Ltd. In the expansion proposal another 1,954.615 sq.m land parcel has been added to the existing land area of 14,439.179 sq.m, which makes the total land area as 16,393.794 sq.m. Existing landuse of the land parcel is bastu. In the expansion proposal, a single Ground + 12 storied residential block will be proposed in addition to the ongoing project. Existing phases (Phase I, II & III) has already obtained the Environmental Clearance from SEIAA, West Bengal (EC No. 1084/EN/T-II-I/032/2012 dated 04.05.2015) & (EC No. 2157/EN/T-II- I/041/2015 dated 27.09.2016). Total numbers of flats in Phase – I + II + III (existing phase) is 428 and in the proposed expansion phase i.e. Phase – IV, another 96 residential flats will be constructed. Thus, total number of flats (including the existing & proposed phases) in this project will be 428 + 96 = 524 nos. Built up area of the existing phases (Phase – I + II + III) is 38,321.38 and in the proposed expansion phase (Phase – IV) additional built up area will be 8,189.79 sq.m. Thus, total built up area including the existing & expansion phases will be (38,321.38 + 8,189.79) sq.m = 46,511.17 sq.m. Thus, the environmental clearance is sought for the expansion phase (Phase – IV). The development will be purely residential although substantial percentage of club & community hall area has been allotted in the design proposal. The landuse of the surrounding area is also predominantly residential in nature. Thus, proposed development is consistent with the surroundings. Maps showing site location, surrounding features, concept proposal etc. are attached in Annexure- 1.1 for reference.
1.2 List out all the major project requirements in terms of the land area, built up area, water consumption, power requirement, connectivity, community facilities, parking needs etc.
Ans: The proposed project is a Residential Complex. Basic requirements for the project in terms of the above-stated criterions are listed below:
Location of Plot : 272, Mouza – Sripur, Bagharghol “A”, J.L. No. – 59, Touzi No. – 1, R.S. Khatian No. 56, 1015, 980, 673, 85, 116, 121, 53, 1220, 225, 100, 226, 74, 120, 558, 573, 118, 119, 51, L.R. Khatian No. – 2740, 2725, 2729, 2735, 2743, 2746, 2732, 2738, 2742, 2733, 2731, 2730, 2736, 2737, 2734, 2728, 2741, 2744, 2759, 2745, 2739, 2768, 1564, 1590, 1780, 1781, 1005; R.S. Dag No. 1169, 1170, 1171, 1172, 1173, 1174, 1175, 1176, 1177, 1178, 1186, 1187, 1188, 1189, 1190, 1193, 1195, 1196, 1197, 1198, 1199, 1200, 1201, L.R. Dag. No. – 1741, 1742, 1743, 1744, 1745, 1146,1747, 1748, 1749, 1750, 1758, 1759, 1760, 1761, 1762, 1767, 1769, 1770, 1771, 1772,1773, 1774, 1775; P.O. - Bonhooghly Police Station – Sonarpur, Holding No. 272, Boral Main Road, Ward No. – 33 of Rajpur Sonarpur Municipality, District – South 24 PGs., West Bengal; Pin Code:
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700103. Connectivity: The project site of the proposed complex is located at Kultala, Bagherghol, Sonarpur and close to Nalgarahaat. The project site is abutted by Boral Main Road, which connects Garia Bazar at its north and Joyenpur at its south direction. Garia Bazar junction is around 3.5km apart from the project site along the north direction. The site is around 6.0 km from Sonarpur railway station. Sonarpur Railway Station, one of the most important railway node providing interface and transfer facilities of the south section Suburban Railway system. Garia Bazar (Kaji Nazrul) metro station of 2nd phase of Metro Railways, located around 3.5 km apart from the project site, has enhanced the regional connectivity in and around the project site. Netaji Subhas International Airport is around 30km from project site.
Area Statement: Land Area : 16,393.794 sq.m Road Width : 15.83m Permissible Ground Coverage : 45% of the Plot Area = 7,377.207 sq.m Permissible Height : 40m Permissible F.A.R. : 2.50 Permissible Built up Area : 40,984.485 sq.m + Area exempted for F.A.R. Calculation
Area Statement for Phase – I + II + III (Existing): Land Area : 14,439.179sq.m Existing Ground Coverage : 33.96% of the Plot Area = 4,904.01 sq.m Existing Built up Area : 38,321.38 sq.m, Existing F.A.R. Area : 32,273.15 sq.m Existing No. of Building : 13 [G + 7 storied = 12 Blocks, G + 4 storied = 1Block] Existing Height of Building : 24.0m (max.) from G.L No. of Residential Flat : 428
Area Statement for Phase – IV (Proposed Expansion): Additional Land Area : 1,954.615sq.m Proposed Ground Coverage : 33.093% of the Plot Area = 646.85sq.m Proposed Built up Area : 8,189.79 sq.m, Proposed F.A.R. Area : 6,917.44 sq.m Proposed No. of Building : 1 (G + 12 storied) Proposed Height of Building : 40.0m from G.L No. of Residential Flat : 96
Area Statement for Total Project Phase – I + II + III (Existing) + Phase – IV (Proposed): Land Area : 16,393.794 sq.m Total Ground Coverage : 33.860% of the Plot Area=5,550.86sq.m Total Built up Area : 46,511.17 sq.m, Total F.A.R. Area : 39,190.59 sq.m Total No. of Building : 14 [G + 7 storied = 12 Blocks, G + 4 storied = 1 Block, G + 12 Storied = 1 Block] Height of Building : 40.0m (max.) from G.L No. of Residential Flat : 524
Landuse Distribution: Development Phase – I+II+III (Existing) Phase – I + II +III + IV (Total) Component Area (sq.m) % of Land Area Area (sq.m) % of Land Area Buildings 4,904.01 33.96 5,550.86 33.860 Services - - 1,617.167 9.865 Internal Road & 2158.224 14.95 3,903.895 23.813 Pavement
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Semi Paved Area 2,895.488 20.05 2,007.092 12.243 Green Area for Plantation 2,900.397 20.09 3,314.764 20.219 Soft Area 1,581.06 10.95 - - Occupancy Pattern: Occupancy Type Phase – I + II + III Phase – IV Total (existing) (proposed) Residents 1934 persons 444 persons 2378 persons Residential Floating 200 persons 44 persons 244 persons Service Staff 30 persons 20 persons 50 persons Total Occupants 2164 persons 508 persons 2672 persons
Power Requirement and Source of Supply: Power requirement for Phase – I+II+III (existing) is assessed as 1474 kW. Additional Power Requirement for Phase – IV (expansion) is assessed as 335 kW. Thus, total power requirement including Phase I + Phase II + Phase III + Phase IV is 1809 kW. Power is supplied by WBSEDCL. D.G. Back up details are as follows; For Phase I + II + III (Existing) = 2X 320 kVA For Phase IV (Expansion) = 1X 320 kVA Total = 3 X 320 kVA
Water Requirement and Source of Supply: Total daily water requirement in Existing & Proposed phases = 415 kLD out of which domestic water requirement is 363 kLD. Water will be available from Rajpur Sonarpur Municipality’s supply, Treated Wastewater from Wastewater Treatment and rooftop rainwater. However, in absence or inadequate municipal supply, groundwater will be abstracted with prior permission from concerned authority.
Parking Requirement: Car Parking Details Phase – I + II + III Phase - IV Total Requirement 224 52 276 Provided 224 (Covered = 117, 52 (Covered = 21, 276 (Covered = 138, Open = 107) Open = 31) Open = 138) Detailed Car Parking Calculation is provided in S. No. – 5.3 of Form –IA.
1.3 What are the likely impacts of the proposed activity on the existing facilities adjacent to the proposed site? (Such as open spaces, community facilities, details of the existing landuse, disturbance to the local ecology).
Ans: The probable impacts due to the proposed project on the existing facilities will be both short-term and long-term in nature. Some of the impacts will be beneficial to the community. On the other hand, some of the impacts might be adverse in nature. The likely beneficial and adverse impacts due to the proposed project are:
A. Impact on Open Spaces While developing the proposed construction, adequate preventive measures will be adopted to control the fugitive emission, wastewater discharge and construction waste disposal procedures, so that the open spaces around the project site do not get affected. During the operational phase also adequate preventive measures will be taken for controlling the above issues. While executing the project, minimum disturbance to the land within the project site will be done. Thus, impact of the proposed project on adjacent open spaces will be minimised.
B. Impact on Community Facilities Presently no community facility exists in the immediate surroundings of the project site. No organized market center is presently located in immediate surroundings of the project site. Only few roadside shops and few educational institutions are located in the nearby area. However,
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organized daily market is located near Nalgarahat and along Boral Main Road. Thus, due to the proposed development, demand for community facilities in terms of market, medical centres etc. might increase.
C. Impact on Existing Landuse The previous landuse of the project site was Sali, Bagan & Danga, which has been transformed into vastu. Landuse of surrounding area is also predominantly residential. Thus, landuse of proposed project will be compatible with the surroundings.
D. Impact on Local Ecology The project site does not have any tree. Thus, there lies no scope of clearing or modification of trees and plantation due to the proposed project. Moreover, quite a number of trees will be planted within this complex. Therefore, local ecology will get improved.
1.4 Will there be any significant land disturbance resulting in erosion, subsidence & instability? (Details of soil type, slope analysis, vulnerability to subsidence, seismicity etc. may be given.
Ans: The soil of the study area has been developed under the dominant influence of river, vegetation and climatic factors. The area is under moderate anthropogenic pressure due to different human activities. The soil of the area consists mainly of sand, silt and clay, deposited by river, partly under river and partly under flat plains. The colour of the soil is grayish. pH of soil inside the site is 7.12. Sand, silt and clay contents are 12%, 45% and 43% respectively. Soil texture is silty clay. Soil analysis report is enclosed in Annexure 1.4. The site is leveled and situated above the flood level of the region, though the existing ground level of the project site is slightly lower than the abutting road. Therefore, a very few appreciable contours are observed. Also, as the building blocks will have foundation, therefore excavation of earthwork and piling activities will take place. Therefore, while executing the project, the existing ground level will be modified. But, adequate measure will be taken to minimize the land disturbance of the project site and surrounding areas.
The soil profile of the project site is as follows: Depth Below Average Depth Description E.G.L. (B.G.L.) Stratum - I 1.80m Top fill with very loose grey silty sand mixed with kankars, underlain by very soft / soft brownish grey / grey silty clay mixed with sand, kankars, puddle clay and conch shells. Stratum - II 1.33m Soft / medium brownish grey / grey silty clay with kankars and silt spots. Stratum - III 10.00m Very soft / soft grey silty with varying percentage (traces to high) of decomposed wood. Stratum - IV 5.37m Medium / stiff bluish grey / mottled brown silty clay with kankars, rusty silt spots and kankars. Stratum - V 6.83m Stiff / very stiff / hard brown sandy clayey silt / clayey sandy silt with traces of mica. Stratum - VA 0.83m Hard mottled brown silty clay with rusty brown silt spots. Stratum - VI >6.45m Dense / very dense brown silty sand with traces of mica and patches of clay. The surrounding area of the project site is predominantly residential. No mining or any other underground activity is carried on in and around the campus. Thus, regarding the subsidence, the project is not at all vulnerable. The area under study falls in Zone-III according to the Indian Standard Seismic Zoning Map. Suitable seismic coefficients in horizontal and vertical directions respectively, will be adopted while designing the structures. There are no chances of floods and landslide as the project site is located
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at a flat terrain and above the flood level of the region.
1.5 Will the proposal involve alteration of natural drainage systems? (Give details on a contour map showing the natural drainage near the proposed project site)
Ans: The project site does not have any water body or natural drainage stream. No pond is located within the project site. Few waterbodies are located in the surrounding area; which also will not be affected due to the proposed development. A copy of survey Plan showing spot level is enclosed in Annexure 1.5.
1.6 What are the quantities of earthwork involved in the construction activity-cutting, filling, reclamation etc. (Give details of the quantities of earthwork involved, transport of fill materials from outside the site etc.)
Ans: The quantity of earthwork for expansion phase is as follows: Earthwork in excavation = 2,000 cu.m (approx.). Excavated earthwork will be reused for site grading and the surplus volume, if any, will be disposed to authorized collection agency. The top soil will be excavated separately and reused for landscaping.
1.7 Give details regarding water supply, waste handling etc. during construction period.
Ans: During construction period, required water of 12 kLD will be supplied by Rajpur – Sonarpur municipality. In absence or inadequacy of municipal supply, groundwater might be abstracted with prior permission from the regulatory authority. Construction waste will also be disposed to authorized agency of the municipality.
1.8 Will the low lying areas & wetlands get altered? (Provide details of how low lying and wetlands are getting modified from the proposed activity)
Ans: During the field visit, the land of the project site is found to be undulated. But, no wetland has been found in and around the project site. Therefore, there remains no chance for any wetland area to get modified from the proposed activity.
1.9 Whether construction debris & waste during construction cause health hazard? (Give quantities of various types of wastes generated during construction including the construction labour and the means of disposal)
Ans: As already stated, the site is mostly vacant. Only a small single storied structure exists, which might be temporarily used for material storage. Thus, no major scope of dismantling is involved herewith. However, during construction some construction waste in the form of unused concrete, mortar, brickbats, wooden planks etc., the quantity of which will vary from 2 – 5% of respective material consumption. Effective material management and environmental management measures will be adopted in order to minimize the volume of construction waste. It is difficult to quantify the volume of construction waste because of the following factors: Phasing of construction activities Skilled workmanship Recycling of such waste. Concrete Waste and Cement Mortar Waste will be reused for site development activities. Brick Waste will also be reused for preparation of sub-base of internal roads and pavements.
The domestic waste from the working as well as residing labourers will also be generated, the volume of which has been preliminarily assessed as 30 kg/day. This waste will also be disposed to municipal waste collection department.
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2. WATER ENVIRONMENT
2.1 Give the total quantity of water requirement for the proposed project with the breakup of requirements for various uses. How will the water requirement met? State the sources & quantities and furnish a water balance statement.
Ans: The total water requirement during both the construction and operational stages of the proposed project, the probable sources & quantities and water balance statement is furnished below: The water requirement for the proposed project can be divided into two stages: Construction Stage Operational Stage i) Water Requirement at Construction Stage Water requirement for Concrete Work = 450 kL Water requirement for Brickwork = 955 kL Water requirement for Plastering = 470kL Water requirement for Flooring = 385 kL
Hence, total water requirement for above-stated construction activities is 2260 kL. Considering 10% of the above water required for site development activities, total water requirement for construction and site development is 2486 kL. Considering the total duration of construction period as 12 months i.e. 365 working days; daily water requirement for construction activities is 6.81 kL say 7 kL. Apart from the construction activities, the labourers residing at the project site will also require water. It is assumed that there will be average 100 labourers working at a time at the project site and about 50% of them, i.e. 50 labourers on an average will be residing at the project site. Considering per capita water requirement as 70 litres per day for their household activities, daily water requirement under this head will be 3500 litres or 3.5 kLD. Water consumption for the non resident labourers will be 50 x @30 lpcd = 1500 litres/day or 1.5 kLD. Therefore, during the construction phase, total daily water requirement will be 7.0 kLD + 3.5 kLD + 1.5 kLD = 12.0 kLD.
ii) Water Requirement during Operational Stage
Occupancy Type Phase – I+II+III Phase – IV Total Residents 1934 persons 444 persons 2378 persons Residential Floating 200 persons 44 persons 244 persons Service Staff 30 persons 20 persons 50 persons Total Occupants 2164 persons 508 persons 2672 persons
a) Domestic Consumption (Phase – I + II + III) = 295 kLD Type of User Per capita Water No. of Users Water Consumption Consumption Residents 150 lpcd 1934 persons 290.10 kLD Residential Floating 15 lpcd 200 persons 3.0 kLD Service Staff 45 lpcd 30 persons 1.35 kLD Total 2164 persons 294.45 i.e 295 kLD
Domestic Consumption (Phase – IV) = 68 kLD Type of User Per capita Water No. of Users Water Consumption Consumption Residents 150 lpcd 444 persons 66.60 kLD Residential Floating 15 lpcd 44 persons 0.66 kLD Service Staff 45 lpcd 20 persons 0.90 kLD Total 508 persons 68.16 i.e 68 kLD
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Thus, Domestic Consumption for total project (Phase – I + II + III + IV) = 363 kLD……..(i) Out of 363 kLD, 1/3 rd volume i.e. 121 kLD will be consumed for toilet flushing, where treated wastewater will be used. Thus, required freshwater for the total project will be at the tune of (363 – 121) kLD = 242 kLD.
b) Water Reqd. for D.G. Cooling = 2.00 kLD ………….(ii) Water Requirement for D.G. Cooling for Phase I + II + III (existing) = 2 kLD The D.G. of the proposed phase will be open D.G. and will be cooled atmospherically. So, Water Requirement for D.G. Cooling for Phase IV (proposed) = 0kLD
c) Water Reqd. for Car Cleaning = 6.00 kLD……(iii) Car Parks provided in Phase I + II + III = 224 Water required for car cleaning = 224 X 20 litres/car = 4.48 kLD say 5 kLD Additional Car Parks provided in Phase IV = 52 Water required for car cleaning = 52 X 20 litres/car = 1.04 kLD say 1 kLD Hence, total car parking water required for the entire project = (5 + 1) kLD = 6 kLD
d) Water consumption for landscaping = 35.00 kLD…………(iv) Landscaping Water Requirement for Phase – I + II + III (Existing Phase) Plot Area = 14,439.179 sq.m Total Green Area under plantation (20% of plot area) = 2887.84 sq.m Total no. of trees to be planted = 2887.84/10000 x 700 = 202.15 say 210 trees Considering the green surface covered by trees and Considering water consumption as 70 litres/tree) Water consumption by the trees is 210 X 70 litres = 14700 litres/day say 15 kLD. Moreover, area of soft surface within the complex is around 1,581.06 sq.m. Considering water consumption for lawn maintenance as 8 lit/sq.m, Water requirement for lawn maintenance = 2240.69 X 8litres/day = 17.9 say 18 kLD. Thus, landscaping water requirement is (15 + 18)kLD = 33 kLD.
Landscaping Water Requirement for Phase – IV (Proposed Phase) Additional Plot Area = 1,954.615 sq.m Additional Green Area under plantation (20% of addl plot area) = 390.92 sq.m Addl. no. of trees to be planted = 390.92/10000 x 700 = 27.4 say 30 trees Considering the green surface covered by trees. and Considering water consumption as 70 litres/tree) Water consumption by the trees is 30 X 70 litres = 2100 litres/day say 2 kLD. There is no soft surface allotted in Expansion Phase. Thus, landscaping water requirement is 2 kLD. Hence, Landscaping Water Requirement for total project = (33 + 2) kLD = 35 kLD
e) Water Reqd. for internal road, pavement & surface parking cleaning = 9.00 kLD……(v) In Existing Phase, surface area for internal road & semi-paved surface is (2158.224 + 2,895.488) sq.m = 5,053.71 sq.m. Considering water consumption as 150 litre/100 sq.m, water requirement will be (5,053.71 X 150/100) litres/day = 7.581 kLD, say 8 kLD. In both Existing & Proposed Phases, total surface area for internal road & semi-paved surface is (3,903.895 + 2,007.092) sq.m = 5,910.987 sq.m Considering water consumption as 150 litre/100 sq.m, cumulative water requirement for the entire project will be (5,910.987 X 150/100) litres/day = 8.866 kLD, say 9 kLD. Hence, Internal Road & Pavement cleaning Water Requirement for Phase IV = (9 - 8) kLD = 1 kLD
f) Water Requirement for Fire Fighting Static water demand for fire fighting purpose will be according to the fire department’s recommendation. In this case, an underground water reservoir of capacity 75 kLD will be
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provided for satisfying the requirement.
Hence, apart from the water required for fire fighting, total water demand of the residential development during both the phases will be as follows:
Activity Phase–I+II+III Phase – IV (Proposed) Sub Total (Existing) Domestic 295 kLD 68 kLD 363 kLD Car Cleaning 5 kLD 1 kLD 6 kLD Internal Road & Pavement 8 kLD 1 kLD 9 kLD D.G. Cooling 2 kLD 0 kLD 2 kLD Landscaping 33 kLD 2 kLD 35 kLD Total 343 kLD 72 kLD 415 kLD
Total Water Consumption = 415 kLD (Water requirement for fire-fighting is not considered as it is a static demand)
SOURCES OF WATER SUPPLY Probable sources for water supply are from Rajpur Sonarpur Municipality’s supply, Abstraction of Groundwater, Treated Wastewater and rooftop rainwater during monsoon.
WATER BALANCE DURING OPERATIONAL STAGE (for total project) Water balance for the proposed complex has been done in following way: Water Requirement for domestic purposes = 363 kLD (source : freshwater & tr. wastewater) Water Requirement for car cleaning = 6 kLD (source : rainwater) Water Requirement for internal road cleaning = 9 kLD (source : treated wastewater) Water Requirement for D.G. Cooling = 2 kLD (source : rainwater) Water Requirement for landscaping = 35kLD (source ; treated wastewater) Total Water Requirement per day = 415 kLD (this quantity excludes the fire-fighting requirement, as that is a static demand) Net Freshwater Requirement for entire project = 242 kLD. Generated Wastewater from domestic activities = 290.4 say 290 kLD (80% of domestic water consumption of 363kLD) Treated Wastewater Available = 261 kLD. (90% of inflow domestic wastewater ) Available Rainwater from Rooftop = 12.0 kLD Treated Wastewater to be used for Internal Rd Cleaning = 9.0 kLD Treated Wastewater to be used for Landscaping = 35.0 kLD Rooftop Rainwater to be used for Car Cleaning = 6.0 kLD
In this project, wastewater treatment facilities will be provided. Treated wastewater will be partially reused for toilet flushing and other secondary purposes like landscaping, internal road & pavement washing etc. Rest volume will be discharged into municipal drain laid along the abutting road. The Water Balance Diagram is enclosed in Annexure – 2.1.
2.2 What is the capacity (dependable flow or yield) of the proposed source of water?
Ans: During the operation phase, required fresh water will be supplied by Rajpur – Sonarpur Municipality. They are supposed to treat the surface water from river Ganga and supply. During the construction phase also, required water will be available from the said municipality. Concurrence letter from the concerned municipal authority is already obtained and a copy of the same is enclosed in Annexure 2.2. However, in inadequate municipal supply, groundwater may be abstracted from the borewells with prior permission from the concerned authority. A copy of the same is also enclosed in Annexure – 2.2.
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Geological formation of the study area controls the occurrence of groundwater. The area is occupied of Alluvial sediments of Recent to Sub-Recent age. The sediments in the upper part have been deposited by Adi-Ganga river system. The Alluvial sediments comprises sand, fine to coarse, gravel and clay beds. The thickness of the aquifer at different vertical dispositions varies widely. By and large, the area is covered by a 30 to 40 m thick clay blanket, beneath which occurs a 30m thick aquifer consisting of coarse sand and gravel. However, there exists a thick impermeable clay layer between 70m and 235m depth. This clay bed often contains sand lenses. The second aquifer system (235m-265m) and the third aquifer (323m-357m) is separated by a thick clay layer (50m- 60m). Below the depth of 357m, a very thick clay layer (357m-612m) persists down to the explored depth of about 600m. The grain size of the aquifer becomes very fine to fine at the deeper level, specially below 300m depth.
Although the upper first aquifer is quite fresh, recently high incidence of Arsenic has been reported in ground water. Groundwater occurring in sand lenses within clay layer is brackish to saline. The second and third aquifer occurring within the depth span of 235m to 323m contain fresh potable arsenic-free groundwater, which is suitable for drinking water supply.
2.3 What is the quality of water required, in case, the supply is not from a municipal source? (Provide physical, chemical, biological characteristics with class of water quality)
Ans: Not applicable. The water is expected to be available from municipal source during its operation. However, to appraise the quality of groundwater in the region, sample from a borewell near the project site has been collected and analysed in a laboratory. The sample has been found suitable for potable use. The analysis report is enclosed in Annexure – 2.3.
2.4 How much of the water requirement can be met from the recycling of treated wastewater? (Give the details of quantities, sources and usage)
Ans: During the operational stage, total daily water requirement of the proposed development is assessed as 415 kLD, out of which 363 kLD will be the domestic demand. The volume of generated wastewater will be around 80% of the domestic water demand i.e. 290kLD, which will be treated in Sewage Treatment Facilities within the complex.
Volume of treated wastewater will be 261 kLD, out of which, 165 kLD will be reused for toilet flushing, site maintenance, landscaping etc. Thus, 39.76% of total water requirement is expected to be fulfilled by recycling of wastewater.
2.5 Will there be diversion of water from the users? (Please assess the impacts of the project on other existing uses and quantities of consumption)
Ans: In the proposed project, there will not be diversion of water from the users.
2.6 What is the incremental pollution load from wastewater generated from the proposed activity? (Give details of the quantities and composition of wastewater generated from the proposed activity)
Ans: During the operational stage of the proposed project, the average daily domestic demand of water will be 363 kLD. Therefore, generated wastewater will be in the tune of around 290 kLD (80% of water consumption). Expected composition of raw and treated wastewater (as per CPHEEO manual) which will be reused for different secondary purposes (mentioned above) are listed below: Expected Wastewater Quality Parameter Raw Wastewater Quality Treated Wastewater Quality pH 6.5 – 7.5 6.5 – 7.5 BOD (in mg/l) 200 <20 COD (in mg/l) 350 <50 TSS (in mg/l) 150 – 250 <20
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Oil & Grease (in mg/l) 45 – 60 <10 Thus, from the above table, it can be mentioned that the treated discharge is within the permissible limit and hence will not impose additional incremental pollution load.
2.7 Give details of the water requirements met from water harvesting? Furnish details of the facilities created.
Ans: Rainwater harvesting procedure is followed by the SEAC Guidelines, West Bengal. The method of storing rainwater does not include the collection of rainwater from ground surface. Rainwater from roofs of the building blocks will be collected through numbers of rainwater pipes and channeled at through a separate network of underground drains, which will ultimately lead into an underground reservoir. The runoff from the ground surface will be channeled through the storm water drains and finally discharged into the municipal storm water drain.
The expected availability has been assessed and mentioned below: According to the guidelines, RWH potential in 1000 sqm Roof Area is considered to be 7,68,000 litres and the storage facility to be created from 1000 sq.m Roof Area is 3 lacs litre (for 10 to 15 storied buildings & above),2.5 lacs litres (6 to 10 storied buildings) and 1.5 lacs (for 3-5 storied buildings) respectively. Rooftop rainwater will first be collected into collection reservoir and the overflow will be directed to recharge wells within the site. The runoff from the ground surface will be channeled through the storm water drains and finally discharged into the municipal storm water drain.
RAINWATER COLLECTION RESERVOIR CAPACITY ASSESSMENT (Existing Phase I, II & II) In our project, the twelve blocks are 8 (G + 7) storied & one block is 5 (G+4) storied Available roof area for all the eight storied building blocks is around 4480 sq.m and the five storied building block is 320 sq.m Thus, available rooftop rainwater for storage is [(4480 X 2,50,000/1000) + (320 X 1,50,000/1000)] litres =1168000 litres = 1168 kL/annum. Considering duration of monsoon as 120 days, daily available rooftop rainwater during monsoon is 1168 / 120 = 9.733 say 10 kLD. In our project, collected rainwater will be used for car cleaning & D.G. Cooling, the water requirement of which is 5 kLD and 2 kLD respectively. Thus, 10 – (5+2) kLD = 3kLD rainwater will be stored into the proposed underground water reservoir. Thus, during the monsoon total volume of surplus rainwater that may be collected is 120 X 3 kLD = 360kL, which may be reused during the lean period. We are proposing an underground reservoir of 100 kL capacity. Balance 260 kL will be recharged in addition to the mandatory recharge.
RAINWATER RECHARGE WELL CAPACITY ASSESSMENT (Existing Phase I, II & II) Rooftop rainwater will first be collected into collection reservoir and the overflow will be directed to recharge wells within the site. Volume of rainwater to be recharged through recharge wells is [(7,68,000 X 4480/1000) X 45% + (7,68,000 X 320/1000) X 15%] = [1548288 + 36864] = 1585152 litres/annum or 1585 kL/annum. Thus, total volume of rainwater to be recharged = 1585 + 260 = 1845 kL/annum Considering the monsoon period as 120 days, the daily average rainfall available is 1845/120 = 15.38 kL say 15 kL which will get recharged into the ground water aquifer through five recharge wells.
RAINWATER COLLECTION RESERVOIR CAPACITY ASSESSMENT (Proposed Phase IV) In the expansion phase, the single block is 13 (G + 12) storied. Available roof area for the thirteen storied building block is around 604 sq.m Thus, available rooftop rainwater for storage is [(604 X 3,00,000/1000)] litres = 181200 litres = 181 kL/annum.
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Considering duration of monsoon as 120 days, daily available rooftop rainwater during monsoon is 181 / 120 = 1.508 say 2kLD. In our project, collected rainwater will be used for car cleaning, the water requirement of which is 1 kLD. Thus, (2-1) kLD = 1kLD rainwater will be recharged into the ground water aquifer. Thus, during the monsoon total volume of surplus rainwater that will be recharged in addition to the mandatory recharge is 120 X 1 kLD = 120 kL.
RAINWATER RECHARGE WELL CAPACITY ASSESSMENT (IV) Rooftop rainwater will first be collected into collection reservoir and the overflow will be directed to recharge wells within the site. Volume of rainwater to be recharged through recharge wells is [(7,68,000 X 604/1000) X 60% ] = 278323 litres/annum or 278 kL/annum. Thus, total volume of rainwater to be recharged = 278 + 120 = 398 kL/annum Considering monsoon period as 120 days, the daily average rainfall available is 398/120 = 3.32 kL say 3 kL which will get recharged into the ground water aquifer through another recharge well. Section of the recharge structure is enclosed in Annexure 2.7.
2.8 What would be the impact of the landuse changes occurring due to the proposed project on the runoff characteristics (quantitative as well as qualitative) of the area in the post construction phase on a long term basis? Would it aggravate the problems of flooding or water logging in any way?
Ans: During the preconstruction stage, the site was fully vacant. Therefore, the runoff characteristic is in the range of 0.2. After the execution of the project including the Phase I, II, III & IV, where 33.86% of the plot area will be covered by building blocks and around 66.14% of the open area will be metallic/ paved, the resultant runoff characteristic will change to 0.6 on an average. Therefore, it can be said that the runoff characteristic of the project site will increase substantially after execution of the project.
The quantified difference of runoff at the project site during the preconstruction and post- construction stage is obtained from the following Runoff-Rainfall Intensity Relationship equation: Q = 10 C i A Where Q = runoff in m3/hr, C = coefficient of run-off i = intensity of rainfall in mm/hr and A = area of drainage district in hectare During the pre-construction stage, following considerations are taken: C = 0.2 i = 40 mm/hr A = 16,393.794 sq.m i.e. 1.64 hectare Therefore, during the preconstruction stage, runoff (Q) will be in the tune of: Q = 10 [0.2 X 40 X 1.64] m3/hr = 131.2 say 131 m3/hr During the post-construction stage, following considerations are taken: C = 0.6 i = 40 mm/hr A = 16,393.794 sq.m i.e. 1.64 hectare Therefore, during the post-construction stage, runoff (Q) will be in the tune of: Q = 10[0.60 X 40 X 1.64] m3/hr = 393.6 say 394 m3/hr
Thus, the surface run-off of the project site will increase by 263m3/hr during the peak rainfall period. It is already stated that the incremental runoff from roof surface will be collected and the non-roof surface will be discharged into drain. To avoid the water logging problem inside the project site, adequate measure will be adopted while designing the stormwater drainage network and drain sections.
2.9 What are the impacts of the proposal on the ground water? (Will there be tapping of ground water;
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give the details of ground water table, recharging capacity, and approvals obtained from competent authority, if any)
Ans: Required freshwater during construction and operation phase of the project will be obtained from Rajpur – Sonarpur Municipal supply. However, in the event of inadequate water supply from municipal source, groundwater will be abstracted for which prior permission is already obtained from the concerned authority.
2.10 What precautions/measures are taken to prevent the run-off from construction activities polluting land & aquifers? (Give details of quantities and the measures taken to avoid the adverse impacts)
Ans: The precautions/measure to be taken to prevent the run-off from construction activities are mentioned in the Environmental Management Plan, enclosed. However, broadly it can be mentioned that the no construction wastewater will be discharged directly into the land, stormwater drain or into the river. A couple of Sediment trap of sizes 2.5m(L) X 2.5m(W) X 0.75m (D) and retention period of half an hour will be constructed during the construction stage, where all construction wastewater will be discharged. After the sedimentation of the construction wastewater, the comparatively cleaner water will be partially reused and the rest part will be discharged into the roadside drain.
2.11 How is the storm water from within the site managed? (State the provisions made to avoid flooding of the area, details of the drainage facilities provided along with a site layout indication contour levels)
Ans: During the post-construction stages, the storm water will be collected into the surface drainage network inside the campus. The drain sizes and sections will be designed in such a way that they can take the load of the peak rainfall period. All the surface drains will be covered by gratings to avoid the litter and other inert waste. Proper land gradient will be provided so that water logging inside the campus does not occur. The collected storm water from the building roofs during the rainfall period will be stored. To reduce the surface runoff and subsequent increase in infiltration of rainwater, attempts will be made to maximize the green surface inside the campus. Adequate number of trees will also be planted. As the site is located in flat terrain, appreciable slope is not observed within the project site. Moreover, proper land grading will be provided so that the slope of the modified ground level remains similar with the natural slope of the region. The drainage & sewerage layout plan is enclosed in Annexure- 2.11.
2.12 Will there be deployment of construction labourers particularly in the peak period lead to unsanitary conditions around the project site (Justify with proper explanation)
Ans: Proper on-site sanitation facilities will be provided for the construction labourers so as to avoid defecation in and around project site. Few numbers of toilets comprising latrine, bath, hand-wash facilities will be constructed inside the project site. Septic tank and soak pits will also be constructed for collection and treatment of domestic wastewater generated from the construction labourers use. Moreover, adequate water supply for drinking and other domestic uses will also be provided during the construction stage of the project. Therefore, it can be presumed that there will not be any deployment of construction labourer during the construction stage of the project.
2.13 What on-site facilities are provided for the collection, treatment & safe disposal of sewage? (Give details of the quantities of wastewater generation, treatment capacities with technology & facilities for recycling and disposal)
Ans: Wastewater treatment facilities will be provided inside the complex. Sewage Treatment Plants will be installed inside the complex, where wastewater will be treated and partially reused. Surplus volume of treated wastewater will be discharged into the roadside drain.
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Water Consumption for Domestic Purposes : 363 kLD Generated wastewater : 290kLD (80% of water consumption) Treated wastewater from Wastewater Treatment Network : 261 kLD. Treated wastewater to be reused : 165kLD Treated wastewater to be discharged into municipal drain : (261 – 165) kLD = 96 kLD. Flow diagram of Sewage Treatment Plant is enclosed in Annexure - 2.13.
2.14 Give details of dual plumbing system if treated waste used for flushing of toilets or any other use.
Ans: Provision of Dual Plumbing System will be kept in this project, as treated wastewater will be reused for toilet flushing.
3. VEGETATION
3.1 Is there any threat of the project to the bio-diversity? (Give a description of the local ecosystem with its unique features, if any)
Ans: No. The project will not pose any threat to the bio-diversity of the locality. No tree exists within the project site. Also, as the project site does not contain any water body, therefore, no scope of disturbance to the terrestrial or aquatic flora is involved. Moreover, quite a number of trees are also going to be planted during the later period of the construction stage. The species will be predominantly native in nature so that they merge with the local ecosystem. The description of the local ecosystem is enclosed in Annexure-3.1.
3.2 Will the construction involve extensive clearing or modification of vegetation? (Provide a detailed account of the trees & vegetation affected by the project)
Ans: No. The construction activity will not involve any clearing of trees, as no tree exists within the project site, already mentioned.
3.3 What are the measures proposed to be taken to minimize the likely impacts on important site features (Give details of proposal for tree plantation, landscaping, creation or water bodies etc along with a layout plan to an appropriate scale)
Ans: Adequate measures will be taken to minimize the likely impacts of the proposed project on the surrounding as well as the project site itself and documented in the Environmental Management Plan. The landscaping and plantation programme and species details are shown in the landscape plan which is enclosed in Annexure-3.3. Around 240 trees will be there during the later part of the construction period of the project. This will include flowering and fruit bearing trees along the boundaries. Mostly native species will be planted. Decorative trees and hedges will be provided along pedestrian pathways.
4. FAUNA
4.1 Is there likely to be any displacement of fauna-both terrestrial and aquatic or creation of barriers for their movement? Prove the details.
Ans: It is already stated that there is no tree or waterbody within the site. Therefore, no scope of displacement of terrestrial as well as aquatic fauna is involved due to the proposed construction.
4.2 Any direct or indirect impacts on the avifauna of the area? Provide details.
Ans: As no tree exists within the site, displacement of avifauna is not involved. Moreover, during the
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operational stages, the planted trees will get matured and invite different birds from the surrounding. Therefore, a positive impact in this respect is expected.
4.3 Prescribe measures such as corridors, fish ladders etc to mitigate adverse impacts on fauna.
Ans: There will not be any adverse impact on fauna due to proposed project.
5. AIR ENVIRONMENT
5.1 Will the project increase atmospheric concentration of gases & result in heat islands? (Give details of background air quality levels with predicted values based on dispersion models taking into account the increased traffic generation as a result of the proposed constructions)
Ans: During the operational stage, the proposed complex will not generate any emission of dust, fumes or gas so that the atmospheric concentration of gases increase. However, as there will be a few numbers of buildings, there might remain a possibility of slight increase in heat island effect, which can be mitigated in following means: i) Judicial layout of building blocks within the complex The building block within the complex is laid in such a manner that there remains sufficient amount of external as well as internal open space between the blocks so that the air movement does not get interrupted. ii) Reducing the footprint of building blocks Only 33.86% of the land area will be occupied by building blocks. Thus, 66.14% of the land area will remain as open space (mostly green). Therefore, much lesser heat gain will be over the green surface. iii) Selection of Building Materials The building materials will be selected in such a way that the solar heat gain over the vertical surface and roof is minimized. iv) Trees and Vegetation Sufficient number of shading trees will be planted inside the project site to reduce the air temperature within the project site and surroundings. v) Reduction in Hard Surface Hard surface in the form of metallic road will be kept minimum. The pavements will be of porous and light coloured material and open joints. The ambient air quality within the project site has been monitored in April, 2012 and from the monitoring result, it is revealed that average SPM and RPM concentration ranges from 190.09 3 3 3 3 µg/m to 210.34 µg/m and 93.53 µg/m to 112.66 µg/m respectively. The concentration of SO2 and NOx ranges from 5.57 µg/m3to 5.70 µg/m3and 23.48µg/m3 to 25.04µg/m3 respectively. This reveals that the concentration of particulate matter is slightly higher than the respective standards, which might be from the ongoing traffic flow in the locality. The concentration of gaseous emission is well within the respective standard. Ambient air quality monitoring report is enclosed in Annexure 5.1. As there will not be any emission generating activity during the operational phase of the complex, there will not be any continuous source of emission and thus the ambient air quality will not be affected. The traffic volume and movement also will be controlled within the complex.
5.2 What are the impacts on generation of dust, smoke, odorous fumes or other hazardous gases? Give details in relation to all the meteorological parameters.
Ans: During the operational stage of the project, there will not be any such activity which can generate dust, smoke, odorous fumes or other hazardous gas. The proposed project is residential complex. Only one 320 kVA DG set might generate little smoke which will be controlled at source.
5.3 Will the proposal create shortage of parking space for vehicles? Furnish details of the present level of transport infrastructure & measures proposed for improvement including traffic management at
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the entry & exit to the project site.
Ans: Car Parking Calculation Phase – I+II+III (Existing) : Bengal Municipal Bldg rules 2007, Total Residential Area = 29,764.97 sq.m Upto 600 sq.m residential area, required car parking space (@150 sq.m/1 car) = 8 nos. Above 600 sq.m and upto 5000 sq.m of residential area, Required car parking space (@140 sq.m/1car) = (8800/140) = 62 nos. Above 5000 sq.m, residential area is (23,591.41 - 5000)+ (6,173.56 - 5000) = 19,764.97 sq.m Required car parking space (@130 sq.m/1car) = (19,764.97 /130) = 152.04 say 152 nos. Total car parking required = (8 + 62 + 152) = 222 nos. Car Parking Space provided in Ground Floor (Stilt) = 117nos. Car Parking Space provided open area = 107 nos. Total Car Parking Space provided = (117 + 107) = 224 Nos.
Car Parking Calculation Phase – IV (Proposed) : Bengal Municipal Bldg rules 2007, Additional Residential Area = 6,215.51 sq.m Upto 600 sq.m residential area, required car parking space (@130 sq.m/1 car) = 4.60 nos. Above 600 sq.m and upto 5000 sq.m of residential area, Required car parking space (@120 sq.m/1car) = (4400/120) = 36.66 nos. Above 5000 sq.m, residential area is (6,214.51 - 5000) = 1,214.51 sq.m Required car parking space (@110 sq.m/1car) = (1,214.51 /110) = 11.04 nos. Total car parking required = (4.60 + 36.66 + 11.04) = 52.30, say 52 nos. Car Parking Space provided in covered area = 21nos. Car Parking Space provided in open area = 31 nos. Total Car Parking Space provided = (21 + 31) = 52 Nos.
The project site is well connected to network of roads leading from various parts of the city. The increase in traffic due to the project is marginal and therefore the impact will be marginal. Internal roads will be provided within the complex.
5.4 Provide details of the movement patterns with internal roads, bicycles tracks, pedestrian pathways, footpaths etc., with areas under each category.
Ans: For the entire project, around 23.813% of the land area (3903.895 sq.m) will be under road and pavement. Moreover, 12.243% of land area (2,007.092 sq.m) will be under semi paved surface covered with grass paver block. There will not be any separate bicycle tracks, pedestrian pathway or footpath.
5.5 Will there be significant increase in traffic noise & vibrations? Give details of the sources and the measures proposed for mitigation of the above
Ans: No. As the complex will be purely residential in nature, adequate attention has been paid while designing the site layout and zoning. Only the vehicle of the residents and service vehicles will be allowed to enter the residential zone of the site. Also, no scope of heavy traffic movement is involved inside except in emergency and the speed limit of the vehicles will be controlled. Therefore, there will not be any significant increase in traffic noise and vibration within the complex. Day time equivalent noise levels (Leq) at project site are 58.12 dB(A) to 76.23 dB(A) respectively. The values are little higher than the respective permissible limit, which is due to the traffic movement along the abutting road. To reduce the impact of generated noise, tree with dense foliage along the roadside boundaries of the project site will be planted. Noise monitoring report is enclosed in Annexure 5.5.
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5.6 What will be the impact of DG sets & other equipment noise levels & vibrations in & ambient air quality around the project site? Provide details.
Ans: Impacts on Air Quality due to DG Sets: Impacts: • Impacts on ambient air during operation phase would be due to emissions from the stacks attached to standby DG set only during grid power failure. Mitigation Measures • Back up DG sets will comply the applicable emission norms. D.G. Sets will be silent type and proper acoustic enclosure will be provided. • Adequate stack height for DG sets will be provided as per norms. • Back up DG sets will be used only during power failure. • Periodic monitoring of emissions from DG sets will be carried out as per norms.
6. AESTHETICS
6.1 Will the proposed constructions in any way result in the obstruction of a view, scenic amenity or landscapes? Are these considerations taken into account by the proponents?
Ans: The maximum height of the building blocks of the proposed project will be 40.0m from G.L. Adequate open spaces according to the municipal building rules will be provided. Sufficient inter building open spaces will also be kept so that the natural daylight, air movement as well as scenic view do not get disturbed.
6.2 Will there be any adverse impacts from new constructions on the existing structures? What are the considerations taken into account by the proponents?
Ans: No. The new construction will be confined within the project site only. Sufficient external open spaces will be provided on all sides of the project site. Moreover, precautionary measures will be adopted while excavating foundation or erecting superstructures by erecting vertical shoring to avoid landslide or soil erosion. It will also help to protect the structural stability of the surrounding existing structures. All the construction materials will be stored within the project site itself. Around 800 sqm area will be provided for stacking of construction materials. The stacking area will be fully covered to prevent spreading of dust. No construction materials or waste will be dumped outside the project boundary or along the abutting roads. Thus, there remains no chance of traffic closure or diversion, due to the proposed construction. Construction activities will be carried on during the day time only. Construction Wastes will be disposed properly by covering with polythene sheets.
6.3 Whether there are any local considerations or urban form & urban design influencing the design criteria? They may be explicitly spelt out.
Ans: The entire project will be developed by abiding the local building rules and regulations set by the regulatory authority of the area. The urban form and urban design of the proposed project will be influenced by the local consideration and simultaneously most contemporary from aesthetic and users point of view.
6.4 Are there any anthropological or archaeological sites or artifacts nearby? State if any other significant features in the vicinity of the proposed site have been considered.
Ans: No anthropological or archaeological sites or artifacts are located nearby. 7. SOCIO-ECONOMIC ASPECTS
7.1 Will the proposal result in any changes to the demographic structure of local population? Provide
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the details.
Ans: Little change in the local demographic structure is envisaged for the project, as around 2393 persons are expected to reside within the complex.
7.2 Give details of the existing social infrastructure around the proposed project.
Ans: The project site falls in Ward No.- 33 of Rajpur Sonarpur Municipal area. The total administrative area of the municipality is 55.30 sq.km. Within the administrative boundary of the municipality, there are 33 wards with 11,818 households. Total population of Rajpur-Sonarpur Municipality is 3,36,390 with a population density of 6,083 per sq.km (as per census 2001).
Considering medical facilities in Rajpur-Sonarpur Municipal area there seem to be a lack of Government initiatives. Only one Municipal Hospital is located in the area. But to cater the need of the local people as well as to that of the people from surrounding area few numbers of private hospitals and nursing homes have been established. Besides these, a large number of Doctor’s clinic, Diagnostic Centre and Medicine shops are located in the study area having a very easy accessibility from the project site. As far as education facilities are concerned, the area has a large number of public and private educational institutions to cater to the need of local residents as well as students from outside area. Bagherghol High School is located closed to the project site. Apart from that quite a number of schools named Tegharia Junior Basic School, Jagannathpur Madrasa School, Sister Nivedita High School, Jatindranath Karmakar Boys’ & Girls’ High School, etc. are located a little far apart from the project site. But above all, Narendrapur Ramkrishna Mission School and Future Engineering Institute has enhanced the educational importance of the area. Regarding market facilities, the area is predominantly residential in nature. A number of essential shops are located sporadically along the abutting road. A small market centre is located at Nalgarahat located around 300m from the project site. But as far as market facility is concerned, the nearest markets in the region are near Rajpur and Harinavi and Kamalgazi Market near Garia Main Road.
7.3 Will the project cause adverse effects on local communities, disturbance to sacred sites or other cultural values? What are the safeguards proposed?
Ans: The project will not cause any adverse effects on local community during the construction or operational stage. No sacred site is located surrounding the project site. Construction activities will not cause any harm to the local habitants in terms of emission, waste generation, effluent generation, noise etc. During the operational phase also, the generated wastewater and solid waste from the complex will be properly managed so that the local community as well as the existing physical infrastructure do not feel the stress. The safeguards are mentioned in the Environmental Management Plan.
8. BUILDING MATERIALS
8.1 May involve the use of building materials with high-embodied energy. Are the construction materials produced with energy efficient processes? (Give details of energy conservation measures in the selection of building materials and their energy efficiency)
Ans: Construction of the project will be done with conventional building material. Energy conservation measures of different building materials and structural components are described below: . The external wall of the building blocks will be constructed with 250mm thick double brick layer, both side plastered (expected U-value = 0.44 W/m2-°C) . The roofs of the building blocks will be constructed with typical 100-150mm thick R.C.C. slab with cement screed and clay tiles (expected U-value = 0.797 W/m2-°C)
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. Glass panes will be 4mm to 6mm thick depending upon the exposure of the surface to the sun. In some of the areas of building façade, double glazing with reflective coating might also be used. Expected U-values of single glazing clear glass are 3.3 W/m2-°C. . Paving materials will be light coloured and porous. The pavement might be of open jointed paver blocks partially depending upon the landscaping scheme.
8.2 Transport and handling of materials during construction may result in pollution, noise & public nuisance. What measures are taken to minimize the impacts?
Ans: All building materials carrying vehicles will be covered with tarpaulin or polythene sheets to avoid spreading of dust and dirt. Separate raw material handling yard will be made. Cement will be separately stored under cover in bales. Sand will be stacked neatly under tarpaulin cover. Bricks and steel will be laid in open. All material transportation will be done during the daytime only. Raw material handling yard will be located within the project site and separated by enclosures.
8.3 Are recycled materials used in roads and structures? State the extent of savings achieved?
Ans: Yes. Recycled materials may be used in roads and land development activities. Depending upon the situation and 10 to 15% savings may be achieved by using recycled materials.
8.4 Give details of the methods of collection, segregation & disposal of the garbage generated during the operation phases of the project.
Ans: Volume of solid waste is 1.364 tonne/day. The break up of daily generated solid waste during the operational phase of the entire project is given below:
Solid Waste Generation Calculation for Phase – I + II + III (Existing) Type of User Per capita solid No. of Users Solid waste generation waste generation Residents 0.5 kg/cap/day 1934 persons 967.0 kg/day Residential Floating 0.1kg/cap/day 200 persons 20.0 kg/day Service Staff 0.3 kg/cap/day 30 persons 9.0 kg/day Site Maintenance 0.05 kg/cap/day 2164 persons 108.20 kg/day Total 1104.20 say 1104 kg/day or 1.104 tonne/day
Solid Waste Generation Calculation for Phase – IV (Proposed) Type of User Per capita solid No. of Users Solid waste generation waste generation Residents 0.5 kg/cap/day 444 persons 222.0 kg/day Residential Floating 0.1kg/cap/day 44 persons 4.4 kg/day Service Staff 0.3 kg/cap/day 20 persons 6.0 kg/day Site Maintenance 0.05 kg/cap/day 508 persons 25.4 kg/day Total 257.8 say 258 kg/day or 0.26 tonne/day
The collection and disposal method of generated solid waste is given below: No indiscriminate disposal of garbage should be allowed within the complex. A proper waste collection system is to be implemented. Waste will be segregated at source. To facilitate this, a multi-bin system will be provided for storing bio-degradable waste as food leftovers, vegetable and fruit peels, non-biodegradable waste such as metal scrap, rubber and recyclable wastes such as papers and plastics. These bins will be in different colours to facilitate the disposal. Organic part of the waste will be composted in an on-site mechanical compost plant.
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For apartments, House to House garbage collection system will be adopted. Waste from yard and garden should be collected into the small handcarts by the sweeper and transported to the common waste bin. Garbage collection procedure is to be conducted during the early morning hours in a day. Accumulation of garbage in the storage bin will be avoided for more than 24 hours and collected garbage will be disposed off daily through municipal garbage disposal system. Waste storage bin size will be adequate to accommodate at least two days solid waste. To avoid the dumping of garbage along the roads, parks, common areas, few number of solid waste storage bins have to be placed in strategic location.
9. ENERGY CONSERVATION
9.1 Give details of the power requirements, source of supply, backup source etc. What is the energy consumption assumed per square foot of built-up area? How have you tried to minimize energy consumption?
Ans: During the operational phase of the project, power requirement for both the existing as well as expansion phases will be around 1809 kW. The source of power supply will be WBSEDCL. Energy consumption has been preliminarily assumed as 10W/m2 for residential apartments, 5W/m2 for Community area and 2W/m2 for service area. Following measures will be adopted to minimize the energy consumption: Energy Efficient Features: . LED lighting fixtures in the common areas . Truelite fluorescent lamps/CFL in apartments . Roof-top thermal insulation . Appropriate design to shut out excess heat gain and loss . Use of solar energy in external lighting . Maximum utilization of natural light for residential apartments
9.2 What type of, and capacity of, power back-up to you plan to provide?
Ans: Existing 2 X 320 kVA DG Sets and proposed 1 X 320 kVA DG Set will provide the back-up, in case of power failure.
9.3 What are the characteristics of the glass you plan to use? Provide specifications of its characteristics related to both short wave and long wave radiation?
Ans: Tinted or clear glass has been preliminarily planned for use in window panes of the apartments. Thickness will vary from 4mm to 6mm depending upon the situation. Main objective of the glass will be to cut the glare, to ensure clear visibility and allowance of maximum natural light.
9.4 What passive solar architectural features are being used in the building? Illustrate the applications made in the proposed project.
Ans: The building blocks will have vertical and horizontal sun shading protection in the form of fins and chajjas. The design, vertical or horizontal projection of those sun shading devices will be dependent upon the exposure of a particular surface to the sun.
9.5 Does the layout of streets & buildings maximize the potential for solar energy devices? Have you considered the use of street lighting, emergency lighting and solar hot water systems for use in the building complex? Substantiate with details.
Ans: This is a residential complex and there will be sufficient organized as well as incidental open
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spaces in and around the building blocks. The said open spaces will be developed as park, garden, lawn, play area etc.; which will be illuminated by solar illumination to the extent possible.
9.6 Is shading effectively used to reduce cooling/heating loads? What principles have been used to maximize the shading of Walls on the East and West and the Roof? How much energy saving has been effected?
Ans: Yes. The shading devices of the building block will be designed in such a way that it cuts the glare but allow maximum amount of diffused sunlight. Also, the roofs of the building block will have adequate thermal insulation. However, no special care about the east and west walls of the building have been thought.
9.7 Do the structures use energy-efficient space conditioning, lighting and mechanical systems? Provide technical details. Provide details of the transformers and motor efficiencies, lighting intensity and air-conditioning load assumption? Are you using CFC and HCFC free chillers? Provide specifications.
Ans: For residential apartments prime importance is given on natural wind circulation and illumination. Keeping in that mind, most of the exterior glazing of the building blocks will be openable type. Thus, operable window area within the building will be maximum. Thus, scope of air infiltration through the glazed windows is also maximum. It is expected that air leakage through entrance doors and operable windows (in closed condition) will not exceed 5.0 l/s-m2. However, in residential apartments also, provision of unit air –conditioners will be provided which will be CFC and HCFC free.
9.8 What are the likely effects of the building activity in altering the micro-climate? Provide a self assessment on the likely impacts of the proposed construction on creation of heat island & inversion effects?
Ans: The proposed construction will not alter the micro-climate of the project site and surroundings significantly. Also, it will not have appreciable impact on creation of heat island and inversion effect due to the following reasons: i) Judicial layout of building blocks within the complex The building block within the complex is laid in such a manner that there remains sufficient amount of external as well as internal open space between the blocks so that the air movement does not get interrupted. ii) Reducing the footprint of building blocks Only 33.86% of the land area will be occupied by building blocks. Thus, 66.14% of the land area will remain as open space (mostly green). Therefore, much lesser heat gain will be over the green surface. iii) Selection of Building Materials The building materials will be selected in such a way that the solar heat gain over the vertical surface and roof is minimized. iv) Trees and Vegetation Sufficient number of shading trees will be planted inside the project site to reduce the air temperature within the project site and surroundings. v) Reduction in Hard Surface Hard surface in the form of metallic road will be kept minimum. The colour of external surfaces of the building blocks will be of lighter shade. The pavements will be of porous and light coloured material and open joints.
9.9 What are the thermal characteristics of the building envelope? (a) roof, (b) external walls; and(c) fenestration? Give details of the material used and the U-values or the R values of the individual components.
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Ans: The U and R values of different components to be used in the project, i.e., glass, wall and roof, are as given in the table below: S.No. Component U-Value R-Value 1 Glass Façade 3.3W/ms-°C -- 2 External Wall 0.44 W/m2-°C -- 3 Roof 0.797 W/m2-°C --
9.10 What precautions & safety measures are proposed against fire hazards? Furnish details of emergency plans.
Ans: Proposed project has already obtained the statutory fire approval from the concerned regulatory authority. Recommended measures by the said authority will be followed during the operational phase of the project. A copy of the Fire Department Recommendation is enclosed in Annexure – 9.10.
9.11 If you are using glass as wall material provides details and specifications including emissivity and thermal characteristics.
Ans: Glass will not be used as wall material, as preliminarily assessed.
9.12 What is the rate of air infiltration into the building? Provide details of how you are mitigating the effects of infiltration
Ans: For residential apartments prime importance is given on natural wind circulation and illumination aspect. Moreover, as the complex has around 66% open space, incoming breezes is considered as a treasure to the residents of the complex. Keeping in that mind, most of the exterior glazing of the proposed building blocks will be openable type. Thus, operable window area within the building will be maximum. Thus, scope of air infiltration through the glazed windows is also maximum. It is expected that air leakage through entrance doors and operable windows (in closed condition) will not exceed 5.0 l/s-m2.
9.13 To what extent the non-conventional energy technologies are utilized in the overall energy consumption? Provide details of the renewable energy technologies used.
Ans: Following the SEAC recommendation, 1% total connected electricity load will be catered by solar power. Solar energy will be used for internal road area illumination as well as for partial common area illumination.
Solar lighting calculation is given below: In our design proposal, area illuminated by solar power is 3,903.895 sq.m i.e. 42,005.91 sq.ft. Considering street lighting load as 2.5Watt/sq.m or 0.23 Watt/sq.ft (as per Indian Green Building Council Manual),
Required lighting load = 42,005.91 X 0.23 = 9,661.36 Watt = 9.661 kW
Considering diversity factor = 0.80, required lighting load is 9,661.36 X 0.8 = 7,729.09 say 7,729 watt i.e. 7.73 kW
Considering power requirement of each street light as 0.15 kW, number of street light fixture required 7.73 / 0.15 = 51.53 say 52nos. 50% of Total Street light fixture to be catered with LED lamps to be catered by solar power. Thus, total number of solar street lighting fixture to be provided is 52 X 50% = 26 nos. Solar Power to be used for partial common area illumination is given below;
In our project, total connected load as preliminarily assessed is 1809 kW.
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Total solar energy to be harvested as per SEAC recommendation is 1% of total connected load i.e. 1809 kW X 1% = 18.09 kW.
Out of 18.09 kW, (9.661/2) = 4.83 kW is being used as outdoor solar illumination. Thus, rest (18.09 – 4.83)kW i.e 13.26 kW of Solar Energy will be used for partial common area illumination.
10. ENVIRONMENT MANAGEMENT PLAN
Ans: Enclosed in Annexure-10.0.
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