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ALAMEDA COUNTYWIDE CLEAN WATER PROGRAM <br />mulch material that will resist floating with surface runoff (such as pea gravel, rock, cobble, or <br />large float -resistant wood mulches), will also help control weed growth. "Mcro-bark' or "gorilla <br />hair" mulches are not recomrrended. <br />Erosion Control <br />Particularly with landscapes that are not fully established, contractors will need to monitor and <br />evaluate potential for erosion and sediment accumulation in the runoff, which will influence <br />irrigation scheduling and as well as determine the need for additional erosion control <br />measures. Soil can be protected from erosion by a number of methods including: <br />■ Keep the soil covered with vegetation to the extent possible; <br />■ Slaw water runoff by using conlmst berms, blanket, socks or tubes along slopes; <br />■ Cover bare soil with a minimum of 3 inches of mulch cover, <br />■ Mnimize the use of blowers in planting beds and on turf; <br />■ On slopes use coarse shredded mulch that is not prone to washing into storms drains <br />C'nicro-bark' and "gorilla hair" rrulches are not recomrnanded forthis application); <br />■ Store leaf litter as additional rruch in planting beds as appropriate. <br />Irrigation Systems <br />W-we irrigation systems have been installed for temporary or per ranent irrigation, the <br />contractor shall maintain the irrigation system for optimum performance, as per manufacturer's <br />specifications. Contractor shall inspect the entire system on an ongoing basis, including <br />cleaning and adjusting all sprinkler and bubbler heads, drip emitters and valves for proper <br />coverage. Contractor shall monitor the irrigation system while operating to identify and correct <br />problems w ith w ater runoff or standing water. <br />IVbnitor soil moisture within plant root zones using a sal probe or shovel and adjust irrigation <br />schedules accordingly if a soil moisture sensor is not being utilized to signal the irrigation <br />controllerlf a Vlkather-Based higation Controller OABq, otherwise known as a "Smart" <br />Controller is not utl¢ed on the project, irrigation shall be scheduled using a water budget <br />approach, basing irrigation frequency on evapotranspiration data (E) to avoid over -irrigation of <br />Pant material. Adjust irrigation frequency within each hydrozone area a minimum of every four <br />weeks to respond to expected adjustments in Er data. <br />If a standard turf mnc is used in lieu of a no -mow variety, irrplement grasscycling, where <br />appropriate to the stomiw ater treatrnent measure. Grass clippings shall not be carried into the <br />drainage structures. Pefer to A Landscaper's Guide to Gaasscycling available from fbscape <br />Cafifomia (also known as the Bay -Friendly Landscaping Coalition) at www.rescapeca.org . <br />Bioretention and Extended Detention Basins <br />in bioretention and extended detention basins, in particular, non-native invasive plant species <br />should be carefully monitored and controlled to reduce competition with the native plantings <br />and to assure the success of the revegetation activities. The estabfshmant of weeds and <br />invasive species in the bottom of the basins can be partially controlled during the establishment <br />period by irrp n-enting the watering schedule of initial saturation followed by alternating <br />B-14 APPENDIX B <br />