Pollution Prevention and Control: Construction activities will include excavation, blasting, drilling, quarrying, aggregate crushing, concrete batching, spoil use and disposal, disposal, concrete laying, brickwork, cabling, erection of structures and equipment. Activities will also include accommodating and feeding up to 3,500 workers as well as transporting, storing, and using fuel, chemicals, paint, and other materials and operating a landfill for project wastes. Operations activities will be at much smaller scale with less risk and potential impact. The subsections that follow describe principal measures included in the ESMP and various management sub-plans to address impacts from these activities.
Air pollution: The ESIA indicates that there are no major sources of air pollution in the vicinity of the project. Measured concentrations of carbon monoxide, nitrogen dioxide, sulfur dioxide and PM10 (particulate matter with a diameter up to 10 microns) in ambient air were found to meet Pakistan National Environmental Quality Standards (NEQS), with PM10 the only pollutant that approached the standard.
The primary sources of air emissions during construction will be the concrete batching plant, operation of vehicles and machinery, and fugitive dust from vehicle use and spoil management. There will be no major sources of air emissions during operation, with even greenhouse gas emissions from the relatively small amount of vegetation to be inundated considered to be minor.
Project construction will emit about 228,000 tons of CO2-equivalent (tCO2-eq) greenhouse gases over the five years of construction (excluding concrete-related emissions). Based on Pakistan’s average mix of energy generation sources and fuels, the project will avoid about 1,600,000 tCO2-eq per year throughout its operating life. An Air Quality Management Plan will include measures to mitigate atmospheric pollution, the most important being the regular sprinkling of unpaved roads and work areas, covering or vegetating long-exposed earthen surfaces, covering dusty truck loads, and systematically maintaining vehicles and construction equipment.
Noise and Vibration: The project area is largely rural and relatively quiet, with the primary sources of noise being road traffic and the river itself. Many on-site construction activities will generate noise, particularly drilling and blasting, excavation, rock-crushing at the concrete plant, truck loading and unloading, operation of generators and other engines, and truck traffic. The primary sources of on-site noise that could reach nearby communities would be blasting and truck traffic on site roads to spoil disposal sites near the communities of Hollar proper and Tulla, which is an isolated part of Hollar. The only important off-site source of noise would be trucks bringing materials, especially aggregate, through local communities, primarily the village of Beor. The EPC contractor will develop and implement a Noise and V
ibration Control Plan to ensure noise levels are kept within the standards of the IFC General EHS Guidelines. This plan will require scheduling blasting and haul traffic (see traffic section below) to avoid sensitive times, providing advice to local communities on project scheduling, providing and enforcing driver training (again, see traffic), selecting and maintaining vehicles and equipment to minimize noise, and other measures to ensure standards are met. The plan also require regular monitoring at off-site locations as well as on-demand monitoring in response to complaints, with additional mitigation as needed to meet standards and avoid nuisance.
Nuisance and damage from vibration caused by blasting will also be addressed in the Noise and Vibration Control Plan. Buildings and other community assets (e.g., the nearby shrine) considered to be at risk will be surveyed by a qualified engineer prior to construction to document their condition and identify any specific vulnerabilities. In addition, all blasts will be monitored at sensitive locations. In response to complaints, instances where vibration criteria limits are exceeded, or where damage could occur, buildings will be re-surveyed and addressed as appropriate (strengthening, compensation, etc.)
Water: There are no industrial sources of pollutants to the upstream Jhelum River, and significant municipal sources are far enough upstream as not to be of concern at the site. Consequently, water quality in the river meets Pakistan National Environmental Quality Standards (NEQS), except that naturally occurring suspended solids cause the water to be highly turbid. The primary sources of potential impact to water quality will be sanitary sewage from up to 3,500 workers on the various construction sites and in the worker accommodations, and erosion of soil and earthen material caused by run-off and erosion. An adequately-sized wastewater treatment plant (WWTP) will serve the main work camp and accommodations, with effluent required to meet national standards. Portable toilets will serve all construction sites, and collected waste will be treated in the WWTP. In addition, concrete wash-water will be treated prior to discharge or used in damping roads for dust control. The EPC contractor Water Quality Management Plan will include operating requirements for the WWTP, including requirements to discharge treated effluent only when river flows are relatively high, not during low-flow periods between hydro peaking discharges in winter. The Plan will require the use of specific and general Good International Industry Practice (GIIP) for drainage and erosion control. Other management plans, including those for spoil management, erosion control, and site reinstatement, will also have important mitigation measures for controlling erosion during and after construction. The plan will require regular monitoring of effluent and receiving water quality and frequent inspections of erosion control practi
ces and their effectiveness.
Potential risks to surface water during the operation phase will also be controlled by a Water Quality Management Plan. Sanitary sewage from the few hundred workers would present a risk to water quality, and this will be treated to meet NEQS prior to discharge. In addition, intakes will not be at significant depth, so lower temperature water will not be drawn from the reservoir and then discharged to the river. Failure of a spoil management facility could lead to massive erosion to the river, and this risk will be managed by the Spoil Management Plan, as well as elements of the Sedimentation and Erosion Control Plan and the Site Reinstatement and Landscaping Plan. Water generated by tunneling activities will pass through settling ponds to reduce turbidity prior to discharge to the river, as will water from concrete plants, which will also be neutralized if needed.
Spoil: Excavations and tunneling operations will generate large amounts of spoil, over 14,000,000 cubic meters (m3). Excavations will generate over 99 percent of the spoil, with most from spillway, powerhouse, and tailrace excavations. Most of the material will not be suitable for use as dam rockfill by virtue of its properties or time of generation, but nearly 5,000,000m3 are expected to be reused in spillway, headrace, and powerhouse construction.
Spoil that cannot be used will be managed in four areas with a total area of over 77 hectares, three on the left bank of the river on the territory of Hollar village and one in the river itself, on and immediately upstream of the dam face. These piles will range from 80 to 95m high when complete. Spoil to be reused in construction will be stored at one of the four disposal sites and then transported to the sites of use. The steep terrain through most of the project area has limited the number of potential sites, and these four sites were selected primarily because they offer fairly large areas with gentler slopes that allow large amounts of spoil to be stored.
Management of the spoil can present a variety of risks, including loading and unloading (noise and dust), transport (noise, safety, and dust emissions), slope instability and failure (water quality and biodiversity), erosion, and washout (water quality and biodiversity). The EPC contractor will develop and implement a Spoil Management Plan that will include design and operating requirements for the disposal sites. These will include requirements for land-clearing and site preparation, lift and bench heights, slopes (no more than 2:1), drainage and safe passage of water under, on top of, and around the spoil, the final configuration, and reinstatement with topsoil and vegetation. If feasible, the EPC contractor will prepare the top surfaces of one or more piles for agricultural use. The Plan will also include requirements for final site restoration, which will provide for long-term stability, and this in turn will require a rigorous mo
nitoring program by KPCL, to last indefinitely after construction is complete.
Solid Waste: The ESIA identified a variety of hazardous and non-hazardous wastes that will be generated during construction. Hazardous wastes include used and spilled oils, fuels, and lubricants, paint and chemicals, contaminated media from spills, batteries, fluorescent bulbs, and medical waste. Non-hazardous wastes include domestic “household” waste from the offices, kitchens, and worker accommodations, packaging and pallet waste, iron and other metal scrap, broken concrete, tires, glass, and others. There are no landfills for some distance from the site, so the EPC contractor will develop a 30,000m2 landfill within the area of one of the spoil disposal sites. The landfill will have a compacted clay base, plastic liner, and leachate collection system, and will be under the supervision of full-time staff. Details of wastes that will be accepted, in particular how some hazardous wastes may be handled, are yet to be determined, but will be detailed in the Waste Management Plan. In addition, ultimate closure of the landfill will be described in the Plan.
Materials management: The ESIA requires that materials be handled so as to minimize the risk of pollution, waste, and risk to workers. This will include recycling and reusing materials where possible, and segregation of wastes by type prior to recycling, reuse, or disposal. Fuel and other hazardous materials will be stored over impermeable surfaces with at least 110 percent containment capacity, and cleanup kits will be kept near storage and use areas. Fueling will take place only in designated areas with an impermeable surface. Workers who handle fuels and other hazardous materials will be trained in emergency response in case of spills and trained in cleanup procedures.