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1 Sequoia Ecological Consulting,Inc. Page <br /> • Final Scope of Work for Environmental Regulatory Compliance& 9 of 14 <br /> Habitat Mitigation Services for Stream Maintenance Project <br /> October 2022 <br /> Just prior to plant installation, Hanford will clear planting areas of weeds and mow areas.This <br /> area will have already been managed for weeds over previous months (Subtask 4.1). Hanford <br /> will install native plants in mid-to-late fall, to take advantage of cool temperatures and potential <br /> rainfall, and crews will also irrigate at the time of planting. Actual plant locations will be <br /> determined in-field, and Hanford will develop an as-built plan with Sequoia to supplement the <br /> original plan. All shrubs and trees in the upland/riparian transition zone will be provisioned with <br /> a browse protection cage(6 feet tall,welded wire mesh with 2-by-4-inch rectangular openings, <br /> secured with two metal t-posts; during plant installation cage will be "sunk" into the ground to <br /> deter potential ground squirrel damage). For the purposes of this budget, costs assume 1,227 <br /> browse cages(upland/transition plants) and a total of 4,279 plantings, but actual number may <br /> vary.The number of plantings and cages described herein are maximum estimates and Hanford <br /> will be able to accommodate up to but not exceeding those amounts.Willow poles will be <br /> sourced and harvested from nearby healthy willow stands and will not have cages installed, <br /> given their location on the streambank. Smaller riparian understory forbs/graminoids will not <br /> have cages. Crews will install supplemental compost with backfilled soil per plant. Crews will <br /> hand-grade a 2-inch diameter earthen water retention basin around each plant, so that <br /> maintenance watering and rainfall collects around each plant's root ball. Crews will install wood <br /> chip mulch 4-inches thick in a 3-foot diameter around each plant to reduce weeds/competitive <br /> pressure and increase water retention at the soil surface. Plants will be installed with an average <br /> spacing of 6-feet apart(triangular spacing) across 5.13 acres. Post-planting, Hanford will design <br /> and build an on-grade irrigation system consisting of PVC pipe, lateral poly drip tube lines,valves <br /> and on-site holding tanks(5,000-gallon).These tanks will be hard lined a City provided water <br /> source (2-inch) approximately 2,200 feet away from the site and a gasoline-powered-in-line <br /> pump may be used to distribute water to various sections of the site during maintenance <br /> (Subtask 4.3) as well.The system will have a series of control valves and battery-operated <br /> controller(s)to distribute water automatically for the duration of the project. <br /> 4.3 Annual Maintenance <br /> Hanford will perform ongoing annual maintenance for six years after implementation. <br /> Maintenance includes supplemental watering through plant establishment during dry season <br /> (approximately two years;this is achieved through the automatic irrigation system, not water <br /> delivery via truck), twice annual mowing (may need modification to frequency depending upon <br /> visual assessments), direct removal of invasives,and replanting depending upon monitoring <br /> results. <br /> Hanford will conduct weed management activities (seasonal mowing, hand-removal of weeds in <br /> direct competition with native plants, removal of invasive plants within the invasive plant <br /> management area and watering of native plants. Hanford crews will prioritize the survival and <br /> health of native plantings,and also, support native recruitment or natural volunteers or <br /> seedlings within the project footprint.A light-on-land approach will be used wherever possible <br />