Estate Service Asset - PDO

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Petroleum Development Oman Estate Services Asset Environmental Assessment 2002 Review and Update groundwater quality only if the quality of treated sewage repeatedly and significantly exceeds the discharge standards. However as seen in Section 4.3.3, the sewage treatment in RAH STPs is generally satisfactory but MAF STP is not up to the satisfactory conditions. With respect to accidental leaks and spills of oils and chemicals on soils, as discussed in Section 4.5, the potential for such occurrences is extremely low. Based on the above discussion, the impact on the groundwater quality is assessed as below: Impact Rating Nature of impact (beneficial / adverse) Duration of impact (short term / long term) Likelihood of occurrence (very low / low / medium / high / very high) Significance of impact (slight / minor / localized / major / massive) Potential risk level (low, medium, high and extreme) Groundwater Pollution Adverse Long term Low Slight Low 6.7 Impacts on Land Environment The potential environmental effects on the land environment and the associated environmental hazards are listed below: Environmental Hazards - Land discharge of treated sewage effluent - Accidental leaks and spills of oils and chemicals Potential Environmental Effects - Land contamination Accidental leaks and spills of oils and chemicals lead to soil contamination only if the quantities of release are high and not contained. Such scenario is considered unlikely as discussed in Section 4.5. Reuse of treated sewage effluent for land irrigation within MAF and RAH areas can result in soil contamination if the quality of treated sewage repeatedly and significantly exceeds the discharge standards. However, STP monitoring data for the year 2002 show that the quality of the treated effluent from RAH STP is well within the permissible limits with respect to the parameters monitored, viz., pH, total suspended solids, ammoniacal nitrogen, BOD, COD and faecal coliforms, except for ammoniacal nitrogen. For MAF-STP, the ammoniacal nitrogen concentration showed repeated exceedance (~70% of the time). Further, free chlorine concentration was repeatedly non-compliant with the specified limits (as required in the STP operating manual). Other critical parameters such as heavy metals, phenols, sodium absorption ratio etc. are not monitored in the treated sewage effluents. In the absence any monitoring data for these parameters, total compliance with the discharge standards cannot be assumed. Moreover, the current practice of weekly monitoring of suspended solids, ©HMR Environmental Engineering Consultants C6 - 6 Oman’s Environmental Consultancy HMR\1501\Estate Services
Petroleum Development Oman Estate Services Asset Environmental Assessment 2002 Review and Update ammoniacal nitrogen, BOD, COD and faecal coliforms is not adequate. It may also be noted that the treated sewage is discharged on the same land areas on continuous basis (long term) and these areas are accessible to public. Based on the above discussion, the impact on soil quality is assessed as below: Impact Rating Nature of impact (beneficial / adverse) Duration of impact (short term / long term) Likelihood of occurrence (very low / low / medium / high / very high) Significance of impact (slight / minor / localized / major / massive) Potential risk level (low, medium, high and extreme) Land Contamination Adverse Long term Medium Localised High 6.8 Impact on Ecology and Wildlife There are no potential hazards in the asset that would have any adverse impact the ecology and wildlife. 6.9 Impact on Social Environment Under social environment, employment, agriculture, animal husbandry, native lifestyle, cultural heritage, public health and safety, landscape and aesthetics are considered. Except for public health and safety, all the impacts on social environment are beneficial, as discussed in Section 6.2. The hazards associated with potential impact on public safety and health are listed below: Environmental Hazards • Storage and transportation of hazardous substances • Release of toxic gases from incinerator stack Potential Environmental Effects • Public safety and health Storage and transportation of hazardous substances, such as combustible liquids, combustible gases and chemicals have the potential to cause damage to public health and safety in the event of significant release into the environment following structural failure and loss of containment. This may lead to fire, explosion, reactivity or toxicity hazard. For estate services, the major hazardous substance handled in significant quantities include diesel oil and LPG. Diesel oil is stored in bulk only in the generator building near the computer building in two aboveground mild steel tanks each of 2270 L capacity. The only safety hazard associated with diesel oil storage is pool fire in case of significant uncontrolled leak. Considering the inventories and the containment ©HMR Environmental Engineering Consultants C6 - 7 Oman’s Environmental Consultancy HMR\1501\Estate Services
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