8920 EVERGREEN WAY THE RESERVE 2025-07-25

CITY OF EVERETT STORMWATER MANAGEMENT MANUAL typically polluted with suspended solids. If a stormwater treatment system is presently on site, a valve should be installed in the containment dike so that excess stormwater can be drained out of the activity area and directed to the treatment system. This valve should always be kept closed unless excess stormwater is being discharged, so that any spills that occur within the activity area can be effectively contained. Difficulties in maintenance may arise with disposal of the captured water on sites without stormwater treatment capability. The collected rainwater may need to be treated before discharge. If the activity is located on impermeable ground,then potentially contaminated water will accumulate within the containment area. If contaminated,this accumulated water cannot simply be drained from the area; it must be collected and disposed of at a licensed disposal facility. During the wet season,this course of action can lead to frequent draining that may prove costly. In addition, some type of monitoring would be needed to determine if ponded water is contaminated. Depending on the monitoring requirements,this can also be very costly. For storage of small items,the simplest containment device is a tub or wading pool. A plastic child's wading pool may be sufficient for some activities that do not require a lot of space, such as storing painting materials, and temporary storage of wastes in drums. For larger areas, a containment curb, dike, or berm may be necessary. If an earthen berm is used, it must be seeded with grass or other vegetation so that it does not erode. The volume of the containment area should be equal to 110 percent of the volume of the largest tank. It should be noted that neglect and poor maintenance can render the containment useless. Other BMPs should be considered before containment is. Commercial products are available that are a combination containment box/elevated pedestal. These effective devices effectively prevent stormwater run-on by elevating containers off the ground, and allow for collection of spills and drips inside the pedestal box. Similar arrangements can be constructed by hand as well. BMPs S.4, S.5, and S.6 in this chapter provide information on covering activities and sump installation. 4.2.7 S.7 Implement Integrated Pest Management Measures Use of herbicides,fungicides, and rodenticides should always be done with extreme caution, not only because of the potential harm to humans and pets, but also because of the potential harm to fish,wildlife, and our water resources. In light of the toxic nature of these compounds, special attention should be given to pesticide usage in all applications. The discussion below applies more to large-scale pesticide users,but should be considered for backyard applications as well. Commercial, agricultural,municipal,and other large scale pesticide users, such as golf courses and parks, should adhere to the principles of integrated pest management, a decision-making process for pest management that strives for intelligent, environmentally sound control of pests. It is a systems approach to pest management that combines agronomic,biological,chemical, and genetic information for educated decisions on the type of control to use,the timing and extent of chemical application, and whether non- chemical means can attain an acceptable level of pest control. Integrated pest management is a preventive measure aimed at knowing the exact pests being targeted for control,the locations and times when pests will pose problems,the level of pest-induced damage that can be tolerated without taking action,the most vulnerable life stage, and control actions that are least damaging to the environment. The major components of integrated pest management are as follows: • Monitoring and inventory of pest populations • Determination of pest-induced injury and action levels Volume IV—Source Control 4-5