Summary of Detailed Route Survey
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DERS Report DETAILED ENGINEERING ROUTE SURVEY REPORT 1. Preamble M/s. Gujarat Gas Limited, Gandhinagar proposes to set up Natural Gas (PNG Network) within different cities of Gujarat State and also in Palghar District of Maharashtra State to supply Natural Gas (PNG) for various industrial, commercial & residential consumers within and around city. GGL proposes to lay Palghar Spurline which will originate from Dahanu Spurline Option - I (TP 21) and terminates at Village Palghar at Ch. 18/627.38 Km in the District of Palghar of Maharashtra State. 2. Introduction In view of above, GGL has planned to establish PNG Network of Palghar District of Maharashtra State. For Palghar city and around, GGL proposes to lay pipeline network within and outside the city limit from GSPL/GSPC GAS/GGL SV/Tap off station, within the existing Roads RoU Network. To achieve the objective stated above, M/s. Gujarat Gas Limited, Gandhinagar has awarded the work to SECON Private Limited for carrying out Reconnaissance Survey, Detailed Engineering Route Survey, Soil Investigation, Soil Resistivity and Cadastral Survey including obtaining Statutory Clearances and RoU Acquisition. The present report covers Detailed Engineering Route Survey including Soil Stratification and Corrosion survey for Palghar Spurline. 3. Length of Pipeline A. Palghar Spurline : 18/627.38 km 4.1 Total number of Turning Points (TPs) A. Palghar Spurline : 264 1 DERS Report 4.1 Details of Take-off and Terminal : A. Palghar Spurline Ch. RL Particulars Village Taluka District State (Km) (m) Take-off Point 0/00 8 Boisar Palghar Palghar Maharashtra Terminal Point 18/627/38 11 Palghar Palghar Palghar Maharashtra 4.3 Photos of Take-off and Terminal Point Take-Off Point Of Palghar Spurline @ Ch. 0/00 Km Terminal Point Of Palghar Spurline @ Ch. 18/627.38 Km 2 DERS Report 5. District & Taluka - wise length of Alignment The proposed Spurline passes through only Palghar Taluka from take-off to terminal point as tabulated below: A. Palghar Spurline: From (km) To (km) Length (km) Taluka District State 0/00 18/627.38 18/627.38 Palghar Palghar Maharashtra Total 18/627.38 6. Type of Terrain / Land Use Based on the terrain configuration, surface features and land use for both Spurline route has been considered as one section and described below : A. Palghar Spurline : SECTION TERRAIN LAND USE From Take-off point at The proposed Pipeline route has been Gently Rising terrain. Dahanu Spurline Option-I routed parallel to Boisar City Internal Road, SH - 4 & 34 and Asphalted, RCC, (TP-21) to Terminal point Surface soil is silty clay Metalled road within RoW limit. at Palghar Village @ Ch. interspersed with marshy 18/627.38 Km. land & weathered rocks with Communication network is very good. seasonal nalas. (Length : 18/627.38 km) 7. Details of Pipeline Alignment : Generally, the pipeline route has been proposed parallel to existing roads from take-off to terminal point. The detail of pipeline alignment is furnished below: A. Palghar Spurline : Sl. Chainage (km) Length (Km) Details of Alignment No. From To Pipeline Route has been Parallel To Asphalted 0/00 4/154.19 4/154.19 1 Road (MIDC). 3 DERS Report Sl. Chainage (km) Length (Km) Details of Alignment No. From To Pipeline Route has been Parallel To Asphalted 4/154.19 8/573.80 4/419.61 2 Road [(Boisar-Navapur) to Muramba] Pipeline Route has been Parallel To Metalled Road 3 8/573.80 9/708.32 1/134.52 [Asp Road (Boisar-Muramba) to Dudh River] 4 9/708.32 10/407.27 0/698.95 Dudh River Crossing and Water Log area Pipeline Route has been Parallel To RCC Road 5 10/407.27 10/649.00 0/241.73 (Dudh River to Dandipada Village) Pipeline Route has been Parallel To Asphalted 6 10/649.00 17/205.34 6/556.34 Road [Dandipada to SH-4(Boisar-Palghar)] Pipeline Route has been Parallel To SH-4 (Boisar to 7 17/205.34 17/674.04 0/468.70 Palghar) Pipeline Route has been Parallel To SH-34 (Palghar 8 17/674.04 18/627.38 0/953.34 to Mahim) Total 18/627.38 8. Crossing Details Both the proposed pipeline route crosses no. of Roads, Canals, Nalas, Underground Utilities, etc. The number of major & minor crossings under each category is furnished below : Sl. Type of Crossing No. of Crossings No. 1 MDR/Asphalted/Metalled /RCC Road 41 2 River 1 3 Nala / Stream /Field Channel/Drain (Major Crossings) 7 4 Cart track /Unmetalled Road 53 5 Underground Utilities 24 6 Nala / Stream /Field Channel/Drain (Minor Crossings) 32 7 Power line 80 Total 238 9. Guidelines for pipeline route selection The pipeline route is optimized based on the following considerations - Safety of public lives and property and safety of the pipeline from Engineering and other considerations. 4 DERS Report - Shortest pipeline length. - Easy and favorable terrain condition free of large water bodies, low lying marshy lands, obstacles like ravines, depressions and unstable grounds, meandering rivers, etc. - Ground profile for pipeline hydraulics and avoidance of steep rising and falling ground, hills and valleys having sloping right of way. - Availability of infrastructure and access to the pipeline route during construction and maintenance. - Environmental impact and avoidance of environmentally sensitive lands, such as reserved forests, marine parks, built-up areas, places of worship, burial. - Minimum crossing of existing pipelines, transmission lines, parallel alignment, etc. - Minimum road, rail, river and canal crossings. - Avoidance of rugged and intricate grounds with hard strata, exposed rocks, boulders and quarries. - Existing and future developments in the region, such as roads, rail lines, canal network, reservoirs, townships, industrial units, etc. - Scope for future expansion of the product pipeline. 9.1 Desktop study including alternates Route selection is a process of identifying constraints, avoiding undesirable areas and maintaining the economic feasibility of the pipeline. Diversion of pipeline around obstacles can be very costly. The ideal route, of course, would be a straight line from the origin to the terminal point. However, physio-graphic, environmental, design and construction constraints usually alter the route. The following factors would be considered while selecting the optimal route of the pipeline both for cross-country as well as in the city area. 9.2 Paper alignment The information supplied by GGL regarding of Take-Off and Terminal locations has been transferred to 1:25.000 scale map based on the maps which are covered by GGL pipeline were identified. Since part of the area falls under restricted zone, pipeline route was transferred to available maps and refined to the extent possible. All the alternatives were studied in the office during desktop study and later on it was verified physically on the ground and the best Alignment has been surveyed which was approved by GGL. 5 DERS Report 9.3 Pipeline route and options The route has been selected confirming to the requirement of GGL. The major constraints along the route are avoiding the developments to the extent possible. In addition to above, pipeline route has been selected to avoid the following: - Forest - Difficulty in obtaining the environmental clearance - Difficulty in construction, operation and maintenance Keeping the entire above requirement, constraints, etc. the pipeline route has been selected. Efforts were made to avoid forest land and undulated / rugged areas as far as possible. All efforts have been made to select the shortest possible route. Pipeline route so selected also meets the requirement of economics, safety, constructibility and availability of ROU including scope for further expansion. 9.4 Detailed reconnaissance survey Based on the route finalized, during reconnaissance survey, route maps have been developed and pipeline route shown thereon. 9.5 Detailed route survey Along the approved route, detailed reconnaissance survey has been carried out. Cement concrete pillars have been embedded at TPs & IPs location regular intervals. Vertical control has been established by transferring levels from nearest GTS Benchmark (after stability check) to the site. Levels have been transferred using Automatic Level to all the Bench mark Point. The originating point was transferred and fixed on the ground by transferring exactly the point from the 1:25,000 scale route map using Differential Global Positioning System (DGPS). Reconnaissance survey was carried out by the advance party between the flag control points. Total station was installed on the starting point and the alignment was made to progress in the same direction. Places where the alignment could not be progressed further, due to obstructions or developments such as, wells, graveyards, forest boundary, private layouts, tanks, quarry areas, etc. Turning Points were fixed at suitable locations for getting smooth alignment and avoiding sharp bends. Establishment of center line has been carried out using high-end Total Station based on the DGPS control points (X, Y & Z) and established the Turning Points and Intermediate Points. 6 DERS Report All Turning Point and Intermediate Point have been embedded with cement concrete for details regarding the total number of TPs / IPs. Based on the Turning Points established, Alignment strip survey has been carried out for a corridor width of 50m on either side of the trench center line using high-end Total Station and all Topographical features have been recorded in the following format. Point ID X Y Z FC Join Code Remarks 9.6 Validation The survey data collected is validated for its positional accuracy (X & Y – horizontal control) as well as elevation (Z – vertical control) before processing the data and generating the drawing. Information / data captured is down loaded to the computer and analysed in order to export the data to various modules which includes: - Alignment sheets - Cross section drawings - Soil Stratification – Bore logs - Corrosion Survey 9.7 Route Map Original Survey of India Topo map was old.