Figure 4.2. Uncovered Washing Area for Tools, Engines, Equipment, and Portable Objects, with Drains to a Sanitary Sewer, Process Treatment, or a Dead-End Sump. Suggested BMPs The following BMPs are not required but can provide additional pollution control: If soaps or detergents are used, use the least toxic cleaner capable of doing the job. Use non-phosphate detergent, if possible, to reduce loadings at your local wastewater treatment plant. Limit the amount of water used in washing activities to reduce the potential of runoff carrying pollutants beyond the designated wash pad or capture system. Recycle washwater for subsequent washings. Implement one or more of the stormwater treatment BMPs found in Volume V. NOTE: For discharging washwaters containing soaps and detergents, the use of infiltration, biofiltration, wet ponds, and wetlands must not result in the violation of groundwater quality standards.
application to control tent caterpillars, it must be applied before the caterpillars cocoon or it will be ineffective. Any method used should be site-specific and not used wholesale over a wide area. Apply the pesticide according to label directions. Under no conditions shall pesticides be applied in quantities that exceed manufacturer’s instructions. Mix the pesticides and the application equipment in an area where accidental spills will not enter surface or groundwater, and will not contaminate the soil. Store pesticides in enclosed areas or in covered impervious containment. Ensure that pesticide contaminated stormwater or spills/leaks of pesticides are not discharged to storm drains. Do not hose down paved areas to a storm drain or conveyance ditch. Store and maintain appropriate spill cleanup materials in a location known to all near the storage area. Cleanup any spilled pesticides and ensure that the pesticide contaminated waste materials are kept in designated covered and contained areas. The pesticide application equipment must be capable of immediate shutoff in the event of an emergency. Do not spray pesticides within 100 feet of open waters including wetlands; ponds; and streams, sloughs, and any drainage ditch or channel that leads to open water, except when approved by Ecology or by . All sensitive areas including wells, creeks, and wetlands must be flagged prior to spraying. As required by or by Ecology, complete public posting of the area to be sprayed prior to the application. applications should only be conducted during weather conditions as specified in the label direction and applicable local and state regulations. Do not apply during rain or immediately before expected rain. Suggested BMPs for the Use of Pesticides Consider alternatives to the use of pesticides such as covering or harvesting substitute vegetative growth, and manual weed control/moss removal. Consider the use of soil amendments, such as compost, that are known to control some common diseases in plants, such as Pythium root rot, ashy stem blight, and parasitic nematodes. The
strips, or buffer areas that drain to sensitive water bodies unless approved by the County. Suggested BMPs for IPM An integrated pest management program might consist of the following steps: Step 1 Correctly identify problem pests and understand their life cycle. Step 2 Establish tolerance thresholds for pests. Step 3 Monitor to detect and prevent pest problems. Step 4 Modify the maintenance program to promote healthy plants and discourage Step 5 Use cultural, physical, mechanical, or biological controls if pests exceed the tolerance thresholds. Step 6 Evaluate and record the effectiveness of the control and modify maintenance practices to support lawn or landscape recovery and prevent recurrence. For an elaboration of steps refer to Appendix IVB, Example of an IPM Program. Finishing, and Coating of Vehicles, Boats, Buildings, and Equipment Description of Pollutant Sources: Surface preparation and the application of paints, finishes, and/or coatings to vehicles, boats, buildings, and/or equipment outdoors can be sources of pollutants. Potential pollutants include organic compounds, oils and greases, heavy metals, and suspended solids. Pollutant Control Approach: Cover and contain painting and sanding operations and apply good housekeeping and preventive maintenance practices to prevent the contamination of stormwater with painting oversprays and grit from sanding. Required BMPs Train employees in the careful application of paints, finishes, and coatings to reduce misuse and overspray. Use ground or drop cloths underneath outdoor painting, scraping, sandblasting work, and properly clean and temporarily store collected debris daily.
containers that can be dumped into a sanitary sewer drain. paints should not be washed down the drain. Recycle paint thinner, solvents, pressure washwater, and any other recyclable materials. Use efficient spray equipment such as electrostatic, air-atomized, high volume/low pressure, or gravity feed spray equipment. Purchase recycled paints, thinner, solvents, and other products if feasible. Printing Operations Description of Pollutant Sources: Materials used in the printing process include inorganic and organic acids, resins, solvents, polyester film, developers, alcohol, vinyl lacquer, dyes, acetates, and polymers. Waste products may include waste inks and ink sludge, resins, photographic chemicals, solvents, acid and alkaline solutions, chlorides, chromium, zinc, lead, spent formaldehyde, silver, plasticizers, and used lubricating oils. As the printing operations are conducted indoors, the only likely points of potential contact with stormwater are the outside temporary waste material storage area and area where chemicals are offloaded at external unloading bays. Pollutants can include total suspended solids, pH, heavy metals, oil and grease, and . Pollutant Control Approach: Ensure appropriate disposal and NPDES permitting of process wastes. Cover and contain stored raw and waste materials. Required BMPs Discharge process wastewaters to a sanitary sewer (if approved by LOTT Alliance Industrial Pretreatment Program (360) 5285708 or to an approved process wastewater treatment system). Do not discharge process wastes or wastewaters into drains or surface water. Determine whether any of these wastes qualify for regulation as dangerous wastes and dispose of them accordingly. raw materials or waste materials that could contaminate stormwater in covered and contained areas.