Establishment of the Existing Environment
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EIA for the Proposed Development at Mukim Rawang, District Of Gombak, Selangor Darul Ehsan for Temasek Ekslusif Sdn Bhd . CHAPTER ESTABLISHMENT OF THE EXISTING 3 ENVIRONMENT 3.1 Introduction The chapter basically highlights the existing baseline scenario according to the three (3) major environmental components namely physical, biological and socio-economical environments. The existing environment is documented to form a basis for the assessment of potential impacts (either positive or negative) generated from the proposed development onto the surrounding environment. Conversely any existing conditions that are likely to impact upon the proposed development itself will also be discussed. The prevalent physical and biological environment will be an indicator of the existing nature’s carrying capacity to adapt to the potential impacts generated by the proposed development. While, the socio-economic background of the surrounding areas is established to represent specific aspects of the human environment, which normally poses significant implications in the implementation of the built development. The existing environment is determined for an impact area which extends for five (5) km radius from the boundary of the Project Site. The assessment is profiled according to site surveys and published secondary data (i.e. maps, reports and structure plans) made available by the relevant government agencies. 3.2 Physical Environment 3.2.1 Topography The existing general topography of the Project Site in relation to the surroundings is shown in Figure 3.1 . Based on topographical survey plan provided by licensed surveyor, the morphology of the Project Site shows that the Project Site is generally characterised as undulating terrains with contour ranging between RL40m to RL80m above mean sea level as shown in Figure 3.2 . The highest ground (approximately RL 130.614m) lies at the peak of the hill lock in the northern portion of the Project Site while the lowest ground (approximately RL 26.573m) is within the valley of Sg. Pechah Mangkok which is situated at the southern boundary of the Project Site as shown in Figure 3.2. The terrain of the Project Site slopes down from the high ground in the northern and western portions towards the valley of Sg. Pechah Mangkok in the middle portion of the Project Site. EUROPASIA ENGINEERING SERVICES SDN. BHD. 3-1 EIA for the Proposed Development at Mukim Rawang, District Of Gombak, Selangor Darul Ehsan for Temasek Ekslusif Sdn Bhd . EUROPASIA ENGINEERING SERVICES SDN. BHD. 3-2 EIA for the Proposed Development at Mukim Rawang, District Of Gombak, Selangor Darul Ehsan for Temasek Ekslusif Sdn Bhd . EUROPASIA ENGINEERING SERVICES SDN. BHD. 3-3 EIA for the Proposed Development at Mukim Rawang, District Of Gombak, Selangor Darul Ehsan for Temasek Ekslusif Sdn Bhd . 3.2.2 Hydrology From the hydrological aspect, the Project Site generally lies within the Sg. Serai river catchment area (refer to Figure 3.3) which is located approximately 82 km upstream of the Sg. Selangor estuary at Kuala Selangor. The Sg. Selangor basin is approximately 70 km long and 30 km wide from the slopes of the mountainous Titiwangsa ranges at Bukit Fraser in the northeast to the Straits of Malacca in the west. The total acreage of the Sg. Serai catchment is approximately 15.53 km 2 (3,837.54 ac) while the total acreage of the Sg. Selangor catchment is approximately 1,820 km 2 (449,731 ac). The existing topography of the proposed development site shows this area is well drained by natural streams and depressions. The major stream within the Project Site is the Sg. Pechah Mangkok which drains the middle portion of the Project Site and flow southwards into Sg. Serai as shown in Figure 3.3 . The eastern portion of the Project Site is drained by Sg. Anak Serai which flows through Kg. Sg. Serai in the eastern boundary of the Project Site prior to draining into Sg. Serai while the southwestern boundary of the Project Site is drained by a tributary of Sg. Serai. Sg. Serai drains into Sg. Kuang which flows into Sg. Kundang at LATAR Expressway (Kuala Lumpur- Kuala Selangor Expressway) and drains into Sg. Garing in the far north, then flows into Sg. Sembah, Sg. Selangor and eventually discharges into the Straits of Melaka. Based on the Water Quality Monitoring and Sources of Pollution within the Sg. Selangor Map (DOE, 1994), updated by the Environment Quality Act 1974 (Act 127) as at 1st April 2013 and water intake stations of Puncak Niaga Sdn. Bhd., there are six (6) water intake points within the Sg. Selangor water catchment. Among these water intake points, Rantau Panjang water intake point at Kg. Rantau Panjang near DOE station 1SR09, and Sg. Selangor Phase II water intake point near Kg. Sg. Darah are located approximately between 29km and 33km downstream of the Project Site respectively as shown in Table 3.1 and as shown in Figure 3.4. Sg. Selangor is recognised as the largest source of water supply to Kuala Lumpur and Klang Valley with two (2) primary clustered water treatment plants located at Bukit Badong and Rasa. The Department of Irrigation and Drainage (DID) water level and flow gauging station (Station No. 3412421) is also located near here. EUROPASIA ENGINEERING SERVICES SDN. BHD. 3-4 EIA for the Proposed Development at Mukim Rawang, District Of Gombak, Selangor Darul Ehsan for Temasek Ekslusif Sdn Bhd . EUROPASIA ENGINEERING SERVICES SDN. BHD. 3-5 EIA for the Proposed Development at Mukim Rawang, District Of Gombak, Selangor Darul Ehsan for Temasek Ekslusif Sdn Bhd . EUROPASIA ENGINEERING SERVICES SDN. BHD. 3-6 EIA for the Proposed Development at Mukim Rawang, District Of Gombak, Selangor Darul Ehsan for Temasek Ekslusif Sdn Bhd . Table 3.1: Water Intake Points within the Sg. Selangor Water Catchment Location of the Water Intake Name of River Water Supply Scheme Location from Longitude Latitude (Water Treatment Plant) the Project Site 101 0 41’ 56”E 30 28’ 45”N Sg. Batang Kali Batang Kali Upstream 101 0 31’ 42”E 30 24’ 24”N Sg. Darah Sg. Buaya Upstream 101 0 40’ 48”E 30 34’ 05”N Sg. Kubu Kuala Kubu Bahru Upstream 101 0 40’ 00”E 30 17’ 00”N Sg. Rangkap Sg. Rangkap Upstream 101 0 26’ 48”E 30 24’ 00”N Sg. Selangor Rantau Panjang Downstream 101 0 26’ 48”E 30 22’ 06”N Sg. Selangor Sg. Selangor Phase II Downstream Source: Environment Quality Act 1974 (ACT 127) as at 1 st April 2013 and Puncak Niaga Sdn. Bhd. 3.2.3 General Geology of the Project Site The geological map of the Project area, as shown in Figure 3.5 , was extracted from The Geological Map of Peninsular Malaysia (1985). The Project Site is located within the Kenny Hill Formation. The geological conditions at the Project Site were evaluated based on a review of geological literatures and site reconnaissance survey. The major rock types included in Kenny Hill formation are occurred as an interbedded sequence of sandstone, shale, siltstone and mudstone believed to be of the Carboniferous - Permian Age. The sedimentary rocks in this formation have undergone both thermal and regional metamorphism due to the intrusion of the Main Range granite, resulting in the alteration of the sandstone, shale and mudstone to metasandstone quartzite, schist and phyllite. The shale is often foliated and finely laminated with beds while the sandstone sequences are often thicker with generally fine to medium grained. The soil material of the Kenny Hill Formation is derived from the intense weathering of the original rocks. Residual and completely to slightly weathered soils derived from the metasediments typically comprise interbedded sandy clay, clayey silty sand and sandy clayey silt. This formation occurs as an interbedded sequence and has moderate dips. Because of these factors the weathering profile and changes of the soil characteristic with depth show variations. Furthermore the resistance of the different layers towards weathering is different. The shale layer is more resistant to weathering whereas the quartzite is more easily weathered into silt. In hilly areas where the activity of erosion is high, the layer of the residual soil is thin. Whereas in the lowlands, the layer of the residual soil is thicker. Occasionally, in the lowlands the soil materials of the Kenny Hill Formation is covered by alluvium especially when it is near the river. EUROPASIA ENGINEERING SERVICES SDN. BHD. 3-7 EIA for the Proposed Development at Mukim Rawang, District Of Gombak, Selangor Darul Ehsan for Temasek Ekslusif Sdn Bhd . EUROPASIA ENGINEERING SERVICES SDN. BHD. 3-8 EIA for the Proposed Development at Mukim Rawang, District Of Gombak, Selangor Darul Ehsan for Temasek Ekslusif Sdn Bhd . 3.2.4 Geological Terrain Mapping Geohazard management of the development planning requires relevant information such as geology, topography, the investigation of landform and terrain related features as well as other relevant geotechnical details as whether the site is potentially unstable due to the presence of landslide or severe erosion. Such information will assist in the preparation of layout plans, the design of the infrastructures and the occurrence of geohazard like landslide or rockfalls. For systematic assessment of utilization of the information, rational evaluations of the overall terrains have to be conducted and the data were presented in the form of various types of thematic maps for landuse planning. The technique of the geological terrain mapping was developed by Jabatan Mineral dan Geosains (JMG) Malaysia and the method was adopted from the method used by the Hong Kong Geotechnical Area Study Programme (GASP). The technique as applied involves mainly following criterion:- (a) Slope gradient (b) Terrain component (c) Activity component (d) Erosion and stability The mapping technique is correlated to Table 3.2 and a series of maps is drawn to derive the classification of the land under study.