CONCEPTUAL PLAN

1.0 Background and Purpose of the Proposed Project Mr. Chenaram Seni is proposing development of a Residential Apartment at Survey Nos: 3847/8, 13 & 14 of Village, Taluk, District in a Total Plot area of 7932.00 Sq.m and Total Built-up Area of 22,517.36Sq.m . The project comprises of 130 Dwelling Units in 3 Blocks with aesthetic architecture, greenbelt, Road and Driveways, Parking Facilities Etc., Project will be backed up by Jains Constructions Pvt.Ltd., Chennai.

2.0 Location of the Project

1 Name of the Project “SEVEN77” by Mr. ChenaramSeni

2 Latitude, Longitude 13° 03’21.67” N,80° 14’53.9” E

S.Nos.: 3847/8, 13 &14,ofTeynampet 3 Location Village, ,

Teynampet Metro Station – 0. 75km Nearest Railway Station 4 DMS Teynampet Metro Station– 1.53 Km

5 Nearest Airport Anna International Airport – 9.45 Km

6 Road approach 12.21 m Cenotaph 2nd lane

7 Elevation above sea level 12 m above MSL

8 Seismic Zone Zone III

Guindy Reserve Forest – 3.18 Km 9 Reserve Forests Nanmangalam Reserve Forest – 13.53 Km Reserve Forest – 24.80 Km

Government Museum– 4.57 km Archeological Sensitive 10 Kapaleeswarar temple – 2.34 Km Area

Location Map

TOPO – 10 KM RADIUS

TOPO – 5 KM RADIUS

TOPO – 1 KM RADIUS

Fig 1: Location map of the Project Site

3.0 Area Statement

The details on the area allotted for the proposed site is given in Table 1

Table 1: Area Statement S.No. Description Area Area (in %) (sqm) 1 Total Plot Area 7932.00 100% 2 Plot Coverage Area 2356.59 29.71% 3 Roads& Driveway 1885.89 23.78% 4 Amenity area 145.54 1.83% 5 Parking Area 1473.93 18.58% 7 Greenbelt Area 1190 15.00% 8 STP &Solid Waste Storage Area 83.2 1.05% 9 OSR Area 796.85 10.05%

Table 1a: Details on Block wise Area Allotment

Block Floor FSI Area Free Of Non Usage 2BHK 3 4 Name Name FSI FSI Flats BHK BHK Area Flats Flats Basement .. 82.66 .. Parking 0 0 0 Stilt Floor 112.05 79.08 .. Parking 0 0 0 1st Floor .. 79.41 … Parking 0 0 0 2nd Floor .. 79.41 .. Parking 0 0 0 Total 112.05 320.56 .. 0 0 0 0 3rd Floor 501.20 0 0 Residential 0 0 2 4th 448.06 0 0 Residential 0 0 2 5th 448.06 0 0 Residential 0 0 2 6th 448.06 0 0 Residential 0 0 2 7th 448.06 0 0 Residential 0 0 2 8th 448.06 0 0 Residential 0 0 2 9th 448.06 0 0 Residential 0 0 2 Block 10th 448.06 0 0 Residential 0 0 2 A 11th 448.06 0 0 Residential 0 0 2 12th 448.06 0 0 Residential 0 0 2 13th 448.06 0 0 Residential 0 0 2 14th 448.06 0 0 Residential 0 0 2 15th 405.51 0 0 Residential 0 0 1 Total 5835.37 0 0 Residential 0 0 25 Block 3rd Floor 1037.44 0 0 Residential 0 7 C 4th 1037.44 0 0 Residential 0 7 0 5th 1037.44 0 0 Residential 0 7 0 6th 1037.44 0 0 Residential 0 7 0 7th 1037.44 0 0 Residential 0 7 0 8th 1037.44 0 0 Residential 0 7 0 9th 1037.44 0 0 Residential 0 7 0

10th 1037.44 0 0 Residential 0 7 0 11th 1037.44 0 0 Residential 0 7 0 12th 1037.44 0 0 Residential 0 7 0 13th 1037.44 0 0 Residential 0 7 0 14th 1037.44 0 0 Residential 0 7 0 15th 1037.44 0 0 Residential 0 7 0 Total 15561.60 0 0 Residential 0 105 0 Ground 145.55 0 0 Recreational 0 0 0 Floor Area 1st Floor 216.65 0 0 Recreational 0 0 0 Block Area C 2nd Floor 325.58 0 0 Recreational 0 0 0 Area Total 687.78 0 0 0 0 0 0 Total 22196.80 320.56 0.00 0.00 0.00 105 25

4.0 Parking statement

Table 2.0:Parking Required

S. Block No. of FSI Area / Required Total No. Total No No. Flats Flat No of Car of Car of Two (in m2) Parks / Parking Wheelers unit* Required Required* 1. Block A 1ECS for every 75 - 25 224.03 50 sq.mof FSI Area 2. Block B 1ECS for every 75 - 105 148.15 150 sq.m FSI of FSI Area 3. Block C 14 687.78 - 14 - Total 214 - 10% Visitors Parking 41 - Total Parking Required 445 - Note: * As per CMDA Norms

Parking Provided:

No of Car Parks Required 214 Nos. No of Car Parks Provided 230 Nos. Parking Area provided 1794.49sq.m

5.0 Power Requirement:

The Power required for the proposed project will be sourced from Tamil Nadu Generation and Distribution Corporation limited (TANGEDCO) of capacity 770.75KVA .2 Nos of 125 KVA for Residential Apartments shall be used as power back up in case of power failure scenario. The DG sets shall be provided with acoustic enclosures as well.

Stack height Calculation: Stack height (m) = Height of the building + 0.2√Capacity of DG

Table 3. Stack details S.No DG Sets Stack Details 1 125 KVA (2 Nos) Individual stacks of height 2 m above the roof top of tallest building in the Development

6.0Population Details:

Total occupancies for the proposed Residential development 715 including diversity factor @10% visitors.

The detail on total occupants are listed in Table 3.

Table 4: Details on Total Occupants S.No Description No. of Persons 1 Residential Apartments Fixed Population No. of Dwellings -130 650 Floating Population 10% of fixed population 65 3 Total Number of Estimated Persons 715

7.0 Water Requirement:

CONSTRUCTION PHASE: Number of employees anticipated at any given point of time – 50 Water Requirement – 60 lpcd * Domestic Requirement – 30 lpcd * Flushing Requirement – 30 lpcd

*Construction Purpose – 40 KLD *Miscellaneous like Dust Suppression, etc., – 5 KLD

The Total water requirement during construction phase will be met through Authorized Tankers. Mobile toilets will be installed with periodical cleaning, thereby avoiding unhygienic condition leading to health hazards.

Water Source – Authorized Tankers Water Requirement 46 KLD

Domestic Water Construction Miscellaneous Flushing Water 1.5 KLD 40 KLD 5 KLD Requirement 1.5 KLD

Sewage Generated 2.7 KLD

Mobile Toilets wherein regular cleaning will be insisted Site Already in fully developed Industrial Estate

Figure 2.0: Water Balance Chart – Construction Phase

OPERATION PHASE With the estimated population, the total water requirement for the development shall be 90 KLD. The water required for the proposed Residential Building during its operational phase shall be sourced through CMWSSB supply .

Table 5: Water Requirement Estimate

Water Total Water S.No Description Occupancies Consumption Requirement

(lpcd) (KLD) Fixed 1 130 x 5 = 650 135 88.0 Population Domestic - 90 58.5 Flushing - 45 29.5 Floating Population 2 Staff 30 45 1.5 Domestic - 20 0.75 Flushing - 25 0.75 3 Visitors 35 15 0.50 Domestic - 5 0.15 Flushing - 10 0.35 Total Water Requirement 90.0 KLD

Water Source – Total Water Requirement 90 CMWSSB KLD Fresh Water Treated Water 59 KLD 31 KLD

Domestic Water Flushing Water Requirement 59 KLD Requirement 31 KLD

Waste water@80% of Waste Water @100% of Domestic Water Flushing Water requirement 31 KLD requirement Sewage Generated 47.2 KLD 78 KLD

STP 90 KLD Greenbelt in Area1190 Sq.m

Excess Treated TreatedTreated Water Water Water 39.5 KL 74 KLD

Excess Treated Water Green Belt Reuse Sump 50KL 3.5 KLD 31 KLD Avenue Plantation through Greater Chennai Corporation

Figure 3 Water Balance Chart for Residential Apartments

7.1 Design of Sewage Treatment Plant

The total water requirement for the proposed project is of 90 KLD. The total wastewater generated from the proposed project is 78 KLD which includes 47 KLD from Domestic use and31 KLD sewage. Being smaller quantity, a single STP is Resorted to instead of segregating Grey water and sewage separately. The sewage generated shall be treated through an STP of capacity 90 KLD .

Characterization: The general characteristics of sewage are considered as shown below. General characteristics: pH : 6.0 – 8.0 BOD5 : 250 mg/l COD : 450 mg/l SS : 200 mg/l Oil & Grease : 20 mg/l

The anticipated final effluent quality: pH : 6.5 – 7.5 BOD5 : < 10 mg/l COD : < 100 mg/l SS : < 20 mg /l Oil & Grease : < 5 E.Coli : None Residual Chlorine : 0.5 – 1.0 mg/l

Design of the individual units: Bar Screen Chamber: Provide a chamber of size 0.5 m x 0.50 m to suit sewer gradient to accommodate an inclined bar screen with opening less than 10 mm. Provide a bar screen of 20 X 6 mm flats with 10 mm spacing in between. Design Criteria: Avg flow : 3.25 m3/hr Peak Flow : 9.75m3/hr Velocity of peak flow through Screen: 0.75 m /sec Area required : 9.75/3600 = 0.0027 m3/sec : 0.0027/ 0.75 = 0.0036 m2 Area of the Screen required : 0.005 m2 The Clear Width of the screen : 0.5 m Size of the screen : 0.5 m x 0.5 m The size of screen chamber shall be provided 0.5 mx0.5 mx 0.5(LD)+0.5 m (FB) Oil & Grease Remover– 1 no Avg flow : 3.25 m3/hr Peak Flow : 9.75 m3/hr

Detention time : 1 min Volume of Chamber : 9.75 / 60 = 0.16 m3 Volume of the chamber provided : 0.5 m3 The Size of the Chamber shall be 0.75m x 0.5 m x 1.5 m(LD) + 0.5 m (FB)

Equalization tank: The flow from the bar screen chamber is let into the equalization tank of minimum 8 hours capacity. This tank is provided to even out the flow variation, and to provide a continuous feed into the secondary biological treatment units. Avg flow : 3.250 m3/hr Peak Flow : 9.750 m3/hr Retention Time : 3hrs @ peak flow Volume Required : 29.250 m3 Tank Size provided : 5x 3.5 x 2.0(LD)+0.5 (FB)

Moving Bed Bio Reactor – MBBR Flow : 90 KLD Requirement : 0.25 kg BOD / m3 / day BOD load : 22.5 kg / day Vol. of the MBBR : 15 m3 Carrier Media BOD Loading Rate : 20 g of BOD / day / m2 Area required for 22.5 kg BOD load : 15 x 1000 /20 = 750m2 Sp. Surface Area of Media : 250 m2 per m3 of media Fluidized Media required : 750 m2 / 250 m2 / m3 : 3.00 m3

Bio Mass Carrier Media Specifications: Shape : Cylindrical Total Surface Area m2 / m3 : 300 – 450 Void Ratio : 80 Density : < 0.97 Oxygen required : 2.0 kg/ kg of BOD Oxygen in air : 23 % Sp. Gr of air @ 30 deg : 1.165 Aeration type : Diffused Aeration Oxygen Transfer efficiency : 12 % BOD Load : 22.5 kg / day Air for Aeration Tank : (22.5x2)/[1.165 x 23/100)x(12/100) x 20] : 69.98 m3Say, 70 m3

Air for Collection Tank : 60 % of Collection Tank volume : 21 m3 (0.6 x 35 m3) Air for treated water tank : 60% Treated water tank Volume : 18.0 m3 (0.6 x 30.0 m3) Total Air Required : 70 +21 +18 = 109 m3 / hr

Air Blower provided : 150 m3 / hr MBBR Volume Required : 5 m3 Considering Inflow BOD variations Volume of MBBR tank provided : 30 m3 MBBR Size : 3.5m x 3.5 m x 2.5 m

Air blower: 2 nos (1 W + 1 S) Air Requirement for the aeration tank : 150 m3/hr Provide the 2 nos of 150 m3/hr @0.4 kg pressure (1 W + 1 S) Capacity blowers.

Secondary Clarifier: The overflow from the aeration tank will be taken into the secondary clarifier for separation of biological floc. Flow : 90 m3 /day Surface Loading Rate : 20 m3 /m2/day Surface Area Provided : 90 / 20 = 4.5 m2 Retention Time Provided : 2 hours Volume Required : 9 m3 Tank Size provided : 3.5m dia x 3.5 m(SWD) +0.5m (FB) Provide Clarifier tank with hopper bottom of 45 Degree angle of repose to allow removal of sludge.

Clarified Water Sump The flow from the secondary Clarifier tank i.e., the supernatant liquid is let into the Clarified Tank, with a minimum 24 hours holding capacity. This tank is provided to hold the treated effluent and give an even flow to the pressure sand filter. FILTER FEED / CLARIFIED WATER TANK Flow : 90 m3/day Retention time : 30 min Tank Volume : 1.625 m3 Tank Volume : 1.2 mX 1.2 mX 1.5 m + 0.5 m (FB)

Filter Feed Pump: 2 Nos (1 W+ 1 S) Flow : 90 m3/day Pumping rate : 5 m3/hr Head : 20 m head Pump Type : Horizontal, Centrifugal

Sludge Holding Tank: Sludge Holding Tank shall be provided for collection of sludge generated from the primary Settling tanks. Sludge collected in this tank shall be pumped to Filter press for thickening of the sludge. The dimension of Sludge Holding Tank will be 1.5 X 1.5 X 1.2 m

Pressure Sand Filter– 1 No Flow : 3.25 m3 /day Operation Time : 20 hr Surface Loading Rate : 8 m3/m2 /hr Surface Area : 3.25 / 8 = 0.40 m2 Diameter of the Vessel : 800 mm Size of the vessel : 0.8 m Ø x 1.0 m (HOS)

Activated Carbon Filter– 1 No Flow : 90 m3/day Operation Time : 3.250 m3/hr Surface Loading Rate : 8.0 m3/m2/hr Surface Area : 3.250 / 8 = 0.40 m2 Diameter of Vessel Required : 800 mm Total Height of Vessel : 1000 mm Size of the vessel : 0.8 Ø x 1.0 m (HOS)

Sludge Handling System Flow : 90 m3/day Raw Sewage SS Concentration : 200 mg/l Raw Sewage BOD : 300 mg/l Quantity of Sludge due to SS : (90 x 200/ 1000) x 30% : 5.4 Kg/day Quantity of Sludge due to BOD : (90 x 300 / 1000) x 90% x 0.25 : 6.07 kg/day Total Sludge Volume : 6.07 Kg/Day

Sludge Transfer Pumps – 2 nos (1 W + 1 S) Flow : 90 m3 /day Pump Capacity : 1 m3 /hr @ 12 m H Quantity : Two (1 W + 1 S) Particle Size : 10 – 50 mm

Excess Sludge Transfer Pump Pump Type : Screw Type Capacity : 3 m3/hr @ 40m head FILTER PRESS Screw Pump : 1 m3/hr Quantity : 1 No MOC : Polypropylene

Treated Sewage Collection Tank Flow : 90 m3/day Pumping rate / Design flow : 3.25 m3 /hr Design Parameter : Retention Time Detention Time : 6 hours

Volume required : 30m3 Tank Size provided :5.0 m x 3.0 m x 2.0 m (LD) + 0.5 (FB)

Ultra Violet System No. of Unit : 2 Type : Slim Line Capacity : 0.5 m3/hr Housing Material of Construction : SS 304

Table 6.0 The units and its sizes of proposed STP: S. Name of the Unit Size in m. No 1. Bar Screen Chamber 0.5 x 0.5 x 0.5 (LD) + 0.5 (FB) 2. Equalization Tank 5x 3.5 x 2.0 (LD) + 0.5 (FB) 3. MBBR 3.5 x 3.5 x2.5 (LD) + 0.5 (FB) 3.5 m dia x 3.5 m (SWD) +0.5 m 4. Secondary Clarifier (FB) 5. Clarified Water Tank 1.2 m X 1.2 m X 1.5 m + 0.5 m (FB) 6. Pressure Sand Filter 0.8 m Ø x 1.0 m (HOS)

7. Activated Carbon Filter 0.8 m Ø x 1.0 m (HOS)

8. Filter Press 14”X 14” 7 plates -1 No 9. Treated Water Tank 3.0 m x 3.0m x 3.5 m (LD) +0.5(FB)

Table 7.0 Mechanical Equipment Proposed S. Item Qty No. 1 Bar Screen 1 No 2 Pumps (0.5HP) 6 Nos 3 Diffuser membranes 3 Nos 4 Coarse Bubble grid 1 lot 5 Blowers 2 No 6 Pressure Sand filter 1 No 7 Activated carbon filter 1 No 8 Filter Press 1 No 9 UV Disinfectant 1 Unit

Raw Sewage

Bar Screen Chamber

Equalization Tank

MBBR

Mechanical Filter Settling Tank Press

Filter Feed Tank

Sludge for Disposal as Manure PSF & ACF

UV Treatment

Treated Water Tank

Reuse for Gardening & Flushing

Proposed STP Scheme

8.0 Solid waste Generation

The Solid Waste estimated to be generated from the Proposed Development shall be 0.45 MT/day. The solid waste generated would be paper waste, wood, vegetables/fruits waste, waste foods etc. The generated waste will be segregated as Biodegradable and Non-biodegradable waste. Source segregation is proposed with common collection and disposal at one point identified for the solid waste management. The quantity of Solid Waste Generation is tabulated in Table 5. The biodegradable waste shall be treated through In vessel Organic Waste Converter and the compost shall be used for gardening within the facility along with the treated STP sludge. The non bio degradable waste shall be handed over to local authority for safe disposals.

Table 8.0 Details on Solid Waste Generation Non- No. of Quantity S.No Description Biodegradable biodegradable Persons (MT/day) (MT/day) (MT/day) Waste from 1 Residential 750 0.45 0.27 0.18 Apartments

3 STP Sludge 6.1 kg/day

Note: * The estimation on solid waste management is as per the provisions of CPHHEO manual [ 3.3.6.2] on solid waste management with the maximum consideration of 0.6 kg/person/day. The distribution of Bio degradable and Non-Bio Degradable is taken as 60% for the former and 40% for the latter

9.0 GROUND WATER POTENTIAL: The objective of the study is the assessment of ground water potential for the proposed site. Further Planning for rainwater harvesting and artificial recharge of ground water will have a positive impact towards the ground water potential.

As the site falls within Chennai city itself with CMWSSB supply available, fresh water for the domestic purpose will be met from CMWSSB. Hence, the study includes planning for maximum possibility of rain water harvesting and recharge to ground water regime.

GEOMORPHOLOGY AND SOIL TYPES:

Chennai district forms part of coastal plains of Tamil Nadu. Major part of the district is having flat topography with very gentle slope towards east. The altitudes of land surface vary from 10 m above MSL in the west to sea level in the east. Fluvial, marine and erosion landforms are noticed in the district. Marine transgression and regressions and neo-tectonic activity during the recent past have influenced the morphology and resulted in various present landforms.

Marina beach is the most natural beach in the world with a width varying from 150 to 600 m and a length of 5.6 km, also encroached by human activity. Theosophical society, located on the banks of Adayar river mouth is the only area with well-preserved natural coastal morphology, sand dunes, beach ridges, flora etc.

The Site is already inside a full developed Industrial Estate [ perhaps one of the oldest industrial estates of Chennai ] housed Exide Industries for a long time [ more than 4 decades ] and apparently discontinued the production for over a decade now. The site handed over to us currently is plain and barren with few trees.

INFILTRATION CAPACITY OF SOIL:

The natural recharge from rainfall largely depends on the soil type, texture and gradient of surface.

Infiltration is the process by which water on the ground surface enters the soil. Infiltration Rate in soil science is a measure of the rate at which a particular soil is able to absorb rainfall or irrigation. It is measured in inches per hour or millimeters per hour. The rate decreases as the soil becomes saturated. If the precipitation rate exceeds the infiltration rate, runoff will usually occur unless there is some physical barrier. It is related to the saturated hydraulic conductivity of the near – surface soil. The rate of infiltration can be measured using an infiltrometer.

S. No. PLACE SOIL TYPE RATE OF INFILTRATION (mm/hr) 1 North Silty Sand 5 – 10 2 South Silty Sand 5 – 10 3 East Silty Sand 5 – 10 4 West Silty Sand 5 – 10

According to the international classification, the infiltration capacity of soil is Moderate and hence the implementation of the rainwater harvesting system will definitely enhance the ground water potential of the area to a smaller extent.

TOTAL WATER REQUIREMENT DURING OPERATION PHASE:

The Total Water requirement of the proposed project is about 90 KLD, in which about 51 KLD of fresh water is utilized towards domestic purposes. It is proposed to be met through CMWSSB and therefore the Rain water harvesting, and recharging will have a Positive impact on Ground Water Potential.

Rainwater Harvesting and Artificial Recharge to ground water is gaining importance due to indiscriminate withdrawal of ground water for multiple uses. Water bearing formation were become over exploited if the ground water withdrawal exceeds the amount of natural recharge. Due to which irreparable environmental consequences were observed.

Over draft of ground water leads to drying up of open wells, deepening of water level in the bore wells, change in quality of water, increase in cost pumping and ecological imbalance. Hence harvesting of surplus run-off occurring during monsoon and artificial recharge to ground water becomes inevitable.

Rainwater harvesting can be done by harvesting of roof top rainwater and collection of surface run-off. Recharge to ground water by rain water harvesting has proved to the most successful methods of water conservation techniques in many parts of country. The methods and design are specific to the site condition.

With the above condition as prevailing at site the consideration on the rain water harvesting is as follows;

The roof water shall be collected separately from terrace through secluded down comers with all the down comers routed to a rain water collection sump positioned at appropriate locations matching with the plumbing scheme of the proposed development. Preferably the sumps shall have interconnectivity to avoid pumping requirements. Rain water collected from other areas viz., hard scapes, path ways, inclusive of the garden area shall be routed through storm water drains provided with on line percolation pits for possible percolation prior to being discharged to the external storm water drain available.

ESTIMATION OF QUANTUM OF RAINWATER HARVESTING:

Estimation of harvestable rainwater can be done in many methods. Use of run- off co-efficient is one of the simplest methods to assess the quantity of rainwater harvested within the area. The effective rainfall is such that the amount of rainfall which can build up surface runoff after satisfying the soil moisture requirement and evaporation loss. It is assumed that about 85% total rainfall is considered to be the effective rainfall.

Rain / Storm Water Management

The storm water drain will be collected along the branch road [Service Roads/ Path ways] and along the main roads running on the set back area on all sides. The storm water from these main and branch roads will enter the drain through side inlets, which will be provided with the road curb at regular intervals on either side.

The soil condition at site and its analytical inference forms the basis of the rain water harvesting proposed. The geo technical analysis reveals the following • Loose soil up to 1.0 m depth below ground level

• Silty Clay upto 3.5 m followed by alternate layers of Silty Clay or Silty Sand up to 24.0 m followed by slated rock up to 26.0 m below existing ground level • The ground water table was met with at 3.5m below ground level at the time of exploration

With the above condition as prevailing at site the consideration on the rainwater harvesting is as follows

The roof water shall be collected separately from terrace through secluded down comers with all the down comers routed to a rainwater collection sump positioned at appropriate locations matching with the plumbing scheme of the proposed development. Preferably the sumps shall have interconnectivity to avoid pumping requirements. Thus collected roof water shall be used along with raw water for domestic applications after due treatment as may be needed. Rainwater collected from other areas viz., hard scopes, path ways, inclusive of the garden area shall be routed through storm water drains provided with on line percolation pits for possible percolation prior to being discharged to the external storm water drain available.

Run off Calculation – Pre Construction and Post Construction Scenario Rational formula for calculating runoff, Q = (C I A) / 360 Q = Runoff in m3/sec I = Intensity of rainfall in mm/ hr A = Drainage area in hectares C = Co-efficient of run off as below

Run-off co-efficient for various types of surfaces Open grounds, unpaved street 0.30 Parks, lawns, gardens Macadam roads, pavements 0.70 Asphalt pavements Water tight roof surface 0.90

Table 9.0 Runoff Water Calculation Pre Post Development Development

Road & Particulars Roof Top Other Landsca Plot Area Area Paved pe Area Area

Area (in Sqm) 7932.00 2356.59 3588.56 1986.85

Area (in 0.7932 0.2357 0.3588 0.1986 Hectares)

Runoff 0.30 0.90 0.70 0.30 Coefficient

Rainfall 100 100 100 100 (mm/hr)

Runoff (cum 0.23 0.21 0.25 0.05 /sec)

Total Run Off 0.23 0.51 (cum /sec)

Incremental Run off (cum/sec) 0.51 – 0.23 = 0.28

❑ Roof top runoff directed to 2 nos. of underground sumps each of Capacity 50 KL ❑ Surface runoff diverted to the recharge pits (4 nos.) besides on line percolation pits provided along the storm water drain

Roof top water harvesting is considered at max. rainfall intensity to collect 100% runoff that last for 15 minute.

3 Q15 minutes = 0.21 × (15*60) =189 m /hr

First flush loss @ 15% = 28.35 m3/hr

Roof top water available for harvesting 189-28.35 =160.65 cum

Rain water holding sump 2 x50 KL=100 KL provided [Equivalent to two days’ fresh water requirement]

SOIL PROFILE @ PROJECT SITE : 1. Refilled earth up to 1m; followed by Silty sand and Silty Clay upto 24.5 m 2. Slated Rock ranges from 24.5 m to 26 m 3. Co-efficient of permeability of Slated rock is 10-4 cm/sec

GROUND WATER TABLE @ PROJECT SITE

1. Ground water table is encountered at 3.2m in the bore holes. 2. Ground water table in the existing Open well- 2-3 m below the Existing Ground level.

SCHEME – ROOF& SURFACE RUNOFF MANAGEMENT

10.0 GREENBELT DEVELOPMENT

During the development of the green belt within the project area, native plant species shall be planted which has good ornamental values and fast growing with excellent canopy cover.

As per MOEF circular, number of trees required to be planted is calculated as follows :

Total Plot Area: 7932.00 sq.m

No.of trees required: 1 tree per 80 sq.m

Therefore , No.of Trees to be planted : 100

Table 10.0 Trees for Greenbelt Development S. No. Scientific Name Standard Name No. of Trees

1 Pongamia glabra Pungan 10

2 Thespesia populnea Poovarasu 10

3 Ficus Religiosa Arasu 3

4 Azadirachta indica Neem 15

5 Terminalia arjuna Neermaruthu 5

6 Calophyllum Punnai 18 inophyllum 7 Syzygium cumini Naval 8

8 Madhuca longifolia Ilippai 18

9 Mimusops elengi Magilam 2

10 Others 11

TOTAL 100

11.0 ENERGY CONSERVATION MEASURES

• Building Architecture to ensure maximum day lighting and minimum ventilation requirement • Building Wall to be of low U factor so as to ensure minimal conduction of heat • LED Lights for all common Areas • Solar Power for street lighting and common utility points • Solar Water Heaters catering to 30% of total requirement • Installation of low flow water fixtures • Installation of energy efficient lighting luminaries with three star rated BEE Labeled • VF &VV Drives for heavy duty motors • Intelligent control for Lifts Energy Modeling was done to predetermine the energy savings which resulted in the energy saving of about 20.6 % over conventional Building.

Table 11.0 Energy Conservation Quantification Common Area Residential Units Energy (KW) Consumption (KW) Energy Savings S. Description Use Over No. Common AC AC Pumps Lighting Equipments (KW) Conventional Lighting Units Units Buildings Conventional 1 130 420 70 591 550 630 2391 - Building Proposed 2 30* 320 50 420 520 560 1900 20.4% Building *Solar power equivalent to 77% of the common area lighting will be provided [100 KW]

12. RISK & HAZARDS MANAGEMENT

Risk is a potential that a chosen action or activity will lead to a loss of human or property. Risk assessment is a step for Risk Management. Risk assessment is determination of qualitative and quantitative value of risk related situation or hazard.

Hazard is a situation that poses a level of threat to life health or environment.

Risk assessment involves the following:

• Hazard Identification • Vulnerability Analysis • Risk Analysis • Emergency Preparedness Plan

12.1 HAZARD IDENTIFICATION

The project is residential complex and there may be following types of hazards:

Natural hazard: 1. Earthquake 2. Flooding

3. Lightening Man-made hazard: 1. Fire & explosion 2. Electrical 3. Mechanical 4. Robbery/Dacoity/Terrorism

12.1.1. VULNERABILITY ANALYSIS

This is a residential complex. hence residents, staff & visitors are vulnerable to risks.

The vulnerable analysis is done on all the hazards as below: During Operation HAZARD IDENTIFICATION Natural hazard Earthquake For all Floors Flood For the whole complex

Man-made hazard Fire & explosion For the whole Complex Electrical For the whole Complex Mechanical DG set room,

12.1.2 RISK ANALYSIS

The purpose is to evaluate and make a decision about the level of fire risk to determine whether to take appropriate risk management measures or not.

A safety plan mainly constituting the following shall be implemented during future construction & Operation Phases:

During construction Phase During Operation Phase

• Safety mats have are being • The project is located in Seismic provided at appropriate level and Zone IV; structural designing various shafts/ openings are will be done as per best covered to prevent falls, slips, trips structural engineering practices etc. complying with all the applicable

• Necessary safety belts, helmets codes / standards. and eye-masks as required are • Proper designing of drainage enforced at site. system for domestic as well as • Adequate guardrails are provided storm water has been provided. to the staircases and common • Rain water harvesting pits will areas. have provision of storage for 45 • Adequate guardrails/ fences are mm peak hourly rainfall. provided around the water storage • Fire Protection system has been spaces to prevent drowning designed as per requirements of accidents. NFPA & National Building Code – • The machinery and the equipment 2005. are being regularly tested and • Proper Fire evacuation system maintained with the specific has been provided. emphasis against accidental • Safety parameters as indicated failures. under Indian Electricity Rules • The deployed Safety officers 1956 and ECBC shall be ensures that the personnel/ labour complied. are kept at a safe distance from • Periodic replacement of critical working machinery to avoid components of elevator/ accidents/ injuries due to toxic machines shall be adopted. gases/ chemical/ noise. • Moving parts of various parts of machineries/ equipment are properly guarded. • Required fire extinguishers are maintained at the construction site. The same shall be adopted for expansion part as well.

Description of each type of hazard and preventive measures taken for each type of hazard with respect to the proposed project is mentioned below:

Earthquake:

The project is located in seismic zone IV where earthquake can occur from 4.0-7.0 Richter scale. Earthquake hazard has been considered as one of the potential threat for the region. The structural design has been scrutinized and certified by empanelled structural engineer as per relevant IS codes, NBC. The foundation and structural design has been scrutinized and certified by structural engineer as relevant IS codes. Flooding:

The project site is located in an area where no water body exist near the site. Hence, no chances of flood is anticipated. However, flooding can occur due to excess rain. Proper RWH system for storm water has been provided to avoid any logging of water & hence leading to flooding. Rain water harvesting pits will have provision of storage for 20 min rainfall.

Lightning:

Lightning arrester will be installed on the top of the building with proper specification and as per the requirement. A complete lightning protection system shall be made up of the following components: • Air Terminals – Also referred to as lightning rods, this inconspicuous copper or aluminium rods are vertically mounted on the roof at regular intervals as defined by industry safety standards. The air terminals serve as strike receptors, designed to intercept the lightning strike. Main Conductors – Constructed of aluminum or copper, these braided cables connect the air terminals to the other system components and the grounds. • Grounds – A minimum of two ground rods, driven at least 10 feet deep in the earth are required for all structures. The ground terminations direct the dangerous current into the ground, to eliminate the chance of injury or damage to the structure. Special grounding requirements are sometimes necessary in shallow, sandy or rocky soil, which are addressed in the industry safety standards for installation. • Bonds – Bonding joins metallic bodies (roof components) and grounded building systems to the main conductor to ensure conductivity and prevent side flashing (lightning jumping between two objects.) • Surge Arresters and Suppressors – A surge is an increase in electrical current due to a lightning strike on or near a power line or utility service. Surge suppression is installed at the electrical panel/s to prevent the entrance of overvoltage which can cause a fire. Arresters installed at electrical panels help protect heavy appliances and prevent fires at the service panel entrances. Additional devices may be needed to protect

other in-house electronics. Surge protection devices are typically installed in conjunction with a lightning protection system.

Fire & Explosion:

Firethreat can happen anytime and anywhere within this housing complex. It may occur within the individual residential unit or in the housing complex from different sources like electrical, cooking etc. Fire safety measures shall be taken as per NBC-2016 Code. Following measures shall be adopted in the complex for fires safety:

For Blocks A&B :

Tank Nos. Capacity Underground fire 2 50 KL each tank Over-head tank 6 10 KL at each Tower

For Block C

Over head tank 1 25 KL

Electrical:

The electrical current can pass to the floor & metals due to inadequate insulation or accidently. The main hazards involved with electricity are:

• Improper Grounding: Electrical equipment will be properly grounded. Grounding reduces the risk of being shocked or electrocuted. The ground pin safely returns leakage current to ground. • Exposed Electrical Parts: Exposed wires or terminals are hazardous. If any wire or electrical part is found in this condition, supervisor will be informed. A panel that has exposed wires will never be used. All openings must be closed and outer insulation on electrical cords must be intact. • Inadequate Wiring: Properly rated extension cords will be used. It will be ensured that all power tools are used with a properly rated extension cord. • Damaged Insulation: Defective or inadequate insulation is a hazard. Insulation prevents conductors from contacting each other. Tools or extension cords with damaged insulation will never be used. • Overloaded circuits: Overloaded circuits can cause fires. Proper circuit breakers will be used. An outlet will never be loaded. • Damaged tools and equipments: Electric tools that are damaged will never be used. Someone may receive a shock or be electrocuted. In addition to that, following measures shall be adopted:

• There will be colour coding and labelling of high voltage electrical wires. • Sand bags/ wire bucket shall be placed near the electrical control/panel • Work practices and handling of the electrical equipment shall be properly managed. • Properly maintained equipment and tools will be used.

• Service of electrical equipment shall be done under the supervision of trained personnel. • Temporary connections made for experimental reasons shall be safe and properly insulated. • Live electrical terminals shall be shielded.

Mechanical: Mechanical hazards are created by powered operation of equipment or tools.

Mechanical hazards can occur at three locations:

1. Elevators 2. DG set room, Pump & motor room. 3. Vehicular Movement

Following preventive measures shall be taken.

1. Elevators shall be properly maintained with record book of maintenance. 2. Periodic replacement of critical components of elevator/ machine. 3. Proper training to operators of DG/STP 4. The protective guard will be installed at motors. 5. There will be safe distance demarcation on heavy machines like cranes (during construction) 6. Sign of danger at the hazard places.

Robbery/Dacoity/Terrorism: All the preventive measures shall be taken as given in security plan. Following measures shall be adopted to prevent any type of terrorist attack:

Site Emergency Plan At The Entry Gate

1. Manual Checks: At all gates the visitors and guest shall be manually checked and asked for ID’s. 2. Boom Barrier shall be installed to restrict entry of unauthorized vehicles.

3. CCTV:Day & Night vision fixed CCTV cameras 4. Checks at Entrances: All cars entering will be checked thoroughly inclusive of Bonnets, Luggage Hold with hand held, metal detectors, mirrors and other checking stuffs. 5. Central Control Room: This will control the security system from inside. 6. Communication Systems: Proper communication system to security staff shall help them to coordinate better during emergencies.

12.2.Emergency Response Procedure

Even after all the preventive measures for any emergency following infrastructure shall be provided.

1. Administrative office shall also make an Emergency Control Room. 2. Assembly area shall be demarked for each building. 3. Communication system shall be installed in the complex which includes intercom and public addressing system. 4. Fire alarm shall be installed at vulnerable place. 5. The evacuation plan of each building shall be displayed at each floor of respective building. 6. The safe zones (at the time of emergency) on map shall be displayed at different locations. 7. First Aid facility shall be made available at Control room.

12.2.1.Emergency Response Procedure During Injury and Illness

If someone has an injury or becomes suddenly seriously ill and requires emergency medical attention, call shall be made to the nearest hospital. In the common areas of the complex there will be a list of ambulance or emergency medical service contact numbers.

12.2.3. EVACUATION PLAN

Evacuation plan includes the evacuation due to

▪ fire hazard ▪ Flood ▪ Earthquake An evacuation policy, procedures, and escape route assignments must be framed to make the residents and visitors familiar with about the person who is authorized to order an evacuation, under what conditions an evacuation would be necessary, how to evacuate, and what routes to take. Exit diagrams are typically used to identify the escape routes to be followed by residents from each specific floor.

12.3.Fire Evacuation Plan: Building occupants are required to evacuate the building when the fire alarm sounds. Instructions: • Immediately the fire department will be notified by pulling the alarm station. • If trained, able and safe (with a sure and safe exit), a portable fire extinguisher will be used to extinguish the fire. If one extinguisher does not put out the fire, evacuation will be followed. • The building will be evacuated as soon as the alarm sounds and proceed to the EAA. • Others will be warned on the way out • Stairs will be used only. Elevators will not be used. • All will be assembled to safe assembly area for accountability and follow-on instructions.

Safety In-charge

Fire & Safety Officer Security In-charge First Aid In-charge

Fire Supervisor Guards Primary Communic First Aid ation Person Hospital Fire Trained Security Communicati Personnel Guard on Office

Fig; 12 Disaster Management Cell

13. Traffic Congestion Study

Roadway Congestion Index (RCI) was selected to quantify congestion for this study

LEVEL OF SERVICE

Table 12.0 Traffic Study Data

Monday to Sunday Days (25-06-19 to 31.05.2019)

Vehicular Type Units Per Day Units Per Day

Location 1 Location 2

Two-wheelers 150 115

Heavy –Motor 80 95 Vehicle

Three wheelers 232 204

Cars 188 154

Light motor vehicles 94 107

Buses 26 20

Total Units Per Day 770 695

Incremental traffic

on account of 124 106

Development

Predicted Peak Load 894 801

Table 13.0 Existing Traffic Scenario & LOS

Measurement V C Existing LOS Performance Point V/C Ratio

Location 1 770 1500 0.51 C Acceptable Level of Service Location 2 695 1500 0.46 B Optimum Level of Service

Predicted Traffic Scenario during operation of the proposed IT/ITES Development: Due to the proposed development, total population of 750 Nos. including visitors is expected. Total parking provisions of 230 Cars will be made within the Residential Development. Table 14.0 Incremental Traffic Scenario & LOS Projected

Existing Traffic Additional Total Modified Modified V V/C LOS Points Volume Volume V/C LOS Ratio

Location 1 770 0.51 C 124 894 0.60 C

Location 2 106 801 0.53 C 695 0.46 B

Traffic post commissioning of the residential development shall also will be in acceptable limits of the traffic LOS.

14.0 ESTIMATED COST FOR ENVIRONMENTAL MANAGEMENT PLAN: Table 15.0: Budgetary Allocation BUDGETRY ALLOCATION S. (Rs. IN LAKHS) DESCRIPTION No. O&M COST PER CAPITAL COST ANNUM BUDGETARY ALLOCATION FOR CONSTRCUTION PHASE Site Sanitation 1 30.00 - Facilities A On-Site Sanitation 6.00 - B Sewer Networks 8.00 - C Run Off Drains 5.00 - D Disinfection 4.00 - E Solid Waste Disposal 7.00 - 2 Health Checkup 6.00 - Environmental 3 10.00 - Monitoring A Air Monitoring 6.00 - B Water Monitoring 3.00 - C Noise Monitoring 1.00 - 4 Control Measures 40.00 - A Air Pollution 15.00 - B Water Pollution 15.00 - C Noise Pollution 2.00 - D Soil Pollution 8.00 COST FOR CONSTRUCTION 86.00 - PHASE BUDGETARY ALLOCATION FOR OPERATIONAL PHASE Site Sanitation 1 125.00 20.00 Facilities Solid Waste A 25.00 5.00 Management Sewage Treatment B 65.00 10.00 Plant Rain Water Harvesting C + Housekeeping 25.00 1.00 Facilities

D Non-Biodegradable 7.00 2.00

SWM E Disinfection 3.00 2.00 2 Health Checkup - 7.00 3 Environmental Monitoring - 8.00 A Air Monitoring - 1.50 B Water Monitoring - 1.00 C Noise Monitoring - 0.50 D Stack Monitoring - 5.00 Energy Conservation 4 125.00 20.00 Measures 5 Control Measures 80.00 15.00 A Air Pollution 15.00 2.00 B Water Pollution 15.00 5.00 C Noise Pollution 10.00 1.00 D Soil Pollution 10.00 2.00 E Greenbelt Development 30.00 5.00 COST FOR OPERATIONAL 330.00 70.00 PHASE

15.0 SOCIO ECONOMIC DEVELOPMENT PLAN: Proposed project in the location at the heart of Chennai city centre will not only eco-friendly habitable units for the inmates but also will generate direct, indirect and self – employment opportunities in this area and improve their economic position positively.

The following shall be followed to ensure socio economic development in the project area: • Eco-friendly sustainable living for those Government and other Leading Organization’s Employees • Direct / Indirect Employment to the people from nearby areas • Increased Revenue to the Government • Proper sanitation facilities shall be provided • Facilities including first aid will be provided

16.0 CER ALLOCATIONS: CER shall be allocated as per the Regulations of the Ministry of Corporate Affairs. As per the Ministry Notification vide: F. No. 22 – 65/2017 – IA.III Dated: 01.05.2018 fund of 0.5% of the Capital Investment shall be made towards the CER Activity .The Fund shall be utilized towards the Activities as prescribed vide the said Notification and the same shall be periodically monitored and reported to MoEF during the Half Yearly Compliance Report Submission.

17.0 CONCLUSIONS

The expected levels of the environmental pollution parameters would be marginal. The project shall provide the following benefits :

• Quality residential development in the most wanted area of the city where many Government and other offices are located • Increased sustainable eco system achieved through adaptation of greener technologies in construction & operations as well • Increased direct &indirect employment to the neighborhood • Increased revenue to the government • Improved socio-economics Over all development of this project will create a positive impact to the community as well as to the surrounding environment thereby ensuring sustainable development.