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CITY OF EVERETT S70RMWATER MANAGEMENi MANUAL <br /> ' <br /> � 5. Lay ships of sod beginning at the lowest area to be sodded and perpendicular to the direction of <br /> water flow. Wedge strips securely into place. Square the ends of cach strip to pruvide for a <br /> close,tight fit. Stagger joints at Icast 12 inches. Staple on slopcs steeper than 3H:1 V. Staple the <br /> upstream edge of cach sod strip. <br /> G. Roll the sodded area and inigate. <br /> 7. When sodding is carricd out in altemating strips or other pattems, seed the azeas between tlie sod <br /> pieces immediately aftcr soddiug. <br /> Maintenance Standards <br /> (f the grass is unhealthy,the cause shall be determined and appropriate action taken to reestablish a <br /> hcalthy groundcover. If it is impossible to establish a healthy groundcover due to trequent saturation, <br /> instability,or some other cause,the sod shali be remo:�ed,thc area sceded with an appropriate miz,and <br /> protected with a net ar blanket. <br /> 3.2.12 BMP C125: Topsoiling <br /> Purpose <br /> The purpose is to provide e suitable growth medium for final sitc stabilization with vegctation. Whilc not <br /> a permanent cover practice in itself,ropsoiling is xn integral component of providing pertnanent covet in <br /> those azeas where there is an unsuitable soil surFacc for plent growth. Native soils and disturbed soils that <br /> 6ave beea organically amended not only retain much more srormwater,but they elso serve es effective <br /> biofilters for urben pollutants and,by supporting more vigorous plant growth,reduce Ihe water,fertilizcr <br /> and pesticides needed to support installed landscapes. Topsoil does not include any subsoils but only the <br /> � roaterial from the top several inches including organic debris. <br /> � <br /> Conditions of Use <br /> • Native soils should be left undisturbed to the maximum extent practicable. Native soils disturbed <br /> duriug clearing and grading should be restored,to the maximum extent precticable,to a condition <br /> where moisture-holding capacity is equal to or better than the or,ginal site conditions. This <br /> criterion can be met by using onsitc native topsoil,incorporating amendments into onsite soil, or <br /> impoRing bleoded topsoil. <br /> • Topsoiling is e required procedure when esteblishing vegetation on shallow soils,and soils of <br /> critically low pH(high acid) Icvels. • <br /> • Shipping of existing,propedy functioning soil system and vegetalion For the purpose o( <br /> topsoiling during conshuction is not acceptable. If an existing soil system is functioning properly <br /> it shall be preserved in its undisturbed and uncompacted condition. <br /> • Depending on where the topsoil comes Gom,or what vegetatioo was on site before disturbance, <br /> invasive plant seeds may be includcd and could cause problems for establishing native plants, <br /> lendscnped areas,or grasses. <br /> • Topsoil from the site will contain mywrthizal bactcria that are neccssary for healthy root @rowth <br /> and nutrient transfer. These native mycocrhiza aze acclimated to ihe site and will provide <br /> optimum conditions for establishing grasses. Commcrcially availablc mycnrrhiza products <br /> should be used when topsoil is brought in from off site. <br /> Design end Installation Speclficafions <br /> If tnpsoiling is to be done,Ihe following items s�all be considered: <br /> Volume II—Construcfion SformwaterPollutior Prevention <br /> 3-20 <br />