2012 Ocean Ranger Guidebook Revision 3-7-12 - Alaska ...

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2012 Ocean Ranger Guidebook 3-7-12 Welldeck discharges that contain graywater from smaller vessels should not be discharged within waters subject to this permit except in cases of emergency. Welldeck discharges from washdown of gas turbine engines may not be discharged within waters subject to this permit. Welldeck discharges from equipment and vehicle washdowns must be free from garbage and must not contain oil in quantities that may be harmful as defined in 40 CFR Part 110. Job Aid Item: 1.2.j Text: Checked if vessel discharged GT turbine wash water < 3 nm. Record date/ volumes / location. (Does not include Turbo blowers / Turbo chargers on diesel engines) (VGP 2. 2. 14 / 40CFR110). What to check for: Gas turbine washwater not directly discharged within 3nm of shore. Background: EPA found that turbine washwater could contain solvents, high levels of metals, and oily residues. There is concern these solvents if mixed with bilge water could allow for discharge of oily wastes. At this time the VGP only addresses gas turbines, it does not include turboblowers or turbochargers. Note that there are other check items referring to solvents, surfactants, and hazardous wastes entering bilgewater- these could apply if the turboblowers are taken apart and washed on the deck of engine spaces. Citation:EPA VGP 2.2.14 Gas Turbine Wash Water Gas turbine wash water must not be directly discharged within waters subject to this permit. Where feasible, such washwater must be prevented from commingling with bilgewater that will be discharged in waters subject to this permit, for example by collecting it separately and properly disposing of it onshore. Under no circumstances may oils, including oily mixtures, from gas turbine wash water be discharged in waters subject to this permit in quantities that may be harmful as determined in accordance with 40 CFR Part 110. Job Aid Item: 1.2.k Text: Fire main discharge only in emergencies, deck wash down or secondary uses IAW(VGP 2.2.12) What to check for: Fire mains only discharged for emergency training, certification, emergencies, or if the intake comes from seawater or potable water. Background: EPA was concerned about high levels of metals found in firemain waters being discharged and wanted to minimize use of fire mains near shore. Citation: EPA VGP 2.2.12 Firemain Systems Discharges from firemain systems are authorized for emergency purposes when needed to ensure the safety and security of the vessel and her crew, other emergency situations, and for testing and inspection purposes as may be required to assure its operability in an emergency. Firemain systems may be discharged in port for certification, maintenance, and training requirements if the intake comes directly from the surrounding waters or potable water supplies and there are no additions to the discharge. Furthermore, firemain discharges may be discharged for deck washdown or other secondary uses if the intake comes directly from the surrounding waters or potable water supplies and the discharge meets all relevant effluent limitation associated with that activity. When feasible, maintenance and training should be conducted outside port and/or outside waters subject to this permit. 22
2012 Ocean Ranger Guidebook 3-7-12 Do not discharge firemain systems in waters listed in Part 12.1 except in emergency situations or when washing down the anchor chain to comply with anchor wash down requirements in Part 2.2.8. Job Aid Item: 1.2.l Text: Pool /Spa water discharges in Alaska waters performed IAW (VGP 5.1.1.2 and 5.1.2.3) What to check for: Discharges meet the terms of the EPA VGP within 3 nm of Alaska, including dechlorination and/or debromination. Chlorine limits are the same as the 2010 Alaska WW GP. Monitoring (testing) must be done if discharges occur within 3nm of Alaska. Pool and Spa discharges are prohibited in Glacier Bay National Park, inside wilderness areas, and inside National Wildlife Refuges. A complete list is found in the EPA VGP Section 12. Background: Cruise ships have large volumes of spa and pool water. While these waters can be relatively clean, they can include high concentrations of chlorine or bromine compounds which are by their nature toxic to marine life. In the case of fecal or vomit incidents high levels of these compounds are used to sanitize the water, often at levels unsafe for humans as well. Accidental discharges of pool and spa water also occur due to valve malfunctions or crew error. Another item of concern is if this water is introduced to the wastewater system it could damage membranes or impact biological processes. Most vessels have dedicated tanks to hold the pool, spa, and Jacuzzi waters. These tanks could be also tanks already used for other ww types and could be mixed. Some vessels neutralize the pool and spa water before discharging overboard or into tanks. Ocean Rangers need to understand these operations and how the neutralization is done, how the volume is determined and all other pertinent information. It is useful to determine if these discharges are included in the discharge logbook. Citations: EPA VGP 5.1.1.2 Pool and Spa Discharges Discharges of pool or spa water are not authorized into waters listed in Part 12.1 of this permit. Discharges from pools and spas are authorized into other waters subject to this permit, provided they are dechlorinated and/or debrominated, and discharged while the vessel is underway. To be considered dechlorinated, the total residual chlorine in the pool or spa effluent must be less than 100μg/l if the pool or spa water is discharged without treatment through an advanced wastewater treatment system. To be considered debrominated, the total residual oxidant in the pool or spa effluent must be below 25μg/l if the pool or spa water is discharged without going through an advanced wastewater treatment system. Pool and spa water may be added to the graywater treatment systems, however any resultant discharge must meet all standards and requirements found in Part 5.1.1.1 and must be debrominated. 5.1.2.3 Treated Pool and Spa Discharges Vessel owner/operators must monitor chlorine or bromine concentrations (as applicable) in pool or spa water before every discharge event using Part 136 methods if they will discharge these streams directly into waters subject to this permit to assure that the dechlorination process is complete. If vessel owner/operators are monitoring bromine concentrations, they may use a field test kit which uses the colorimetric method in lieu of Part 136 methods to assure waters have been debrominated, provided that test kit has method detection limit no 23
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2012 Ocean Ranger Guidebook Revision 3-7-12 - Alaska ...

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