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CITY OF EVERETT STORMWATEit MPNA6EMENT MANUAL <br /> ) <br /> � c. Minimum volume of excavation 3.5 cubic yards <br /> d. Shape basin to fit site with longest dimcnsion orieNed toward the longest inflov area <br /> e. lnstall provisions for draining to prevent standing water problems <br /> `. Clear thc arca of all dcbris <br /> g. Grade Ihe approach to the inlet unifomily <br /> h. Dtill weep holes into the side of the inlei <br /> i. Protect wcep holes with screen w'vc and washed aggregate <br /> j. Seai weep holes when rcmoving structure and stabilizing area <br /> k. It may be nccessary to build a temporary dike ta the down slope side of thc struchve ro <br /> prevcnt bypass flow. <br /> 2. B(ock nnd Gravel Fiker—A bamer fomted around the storm drain ialct wit6 standazd concrete <br /> blocks and gravcl. Sec also DCSS Drawing N 209. <br /> a. Height 1 ro 2 feet above inlet <br /> b. Reccss the first row 2 inches into the ground for stability <br /> c. Support subsequent courses by placing a 2 x 4 through the block opening <br /> d. Do not use mortar <br /> c. Lay some blocks in thc bottom row on their side for dewatering the pool <br /> � E Placc hardwaze cloth or compazable wire mesh with one-half-inch openings ovcr all <br /> ' block openings <br /> g. Place gravel just below the top oi blocks on slopcs of 2:1 or Oatter <br /> h. M altemativc design is a gavel donut <br /> i. Inlet slope of 3:l <br /> j. Outlet slope of 2:1 <br /> k. I-foot widc Icvcl stonc area betwcen thc structurc and thc inlct <br /> I. fnlet slope stones 3 inches in diemetcr or larger <br /> m. Outlet slope use gravel one-half to three•fourths inches at a minimum thickncss of <br /> 1 foot. <br /> 3. Gravel and �Vire Mesli Filfcr—A gravcl 6arricr placcd over the top of thc inlct. This sWclurc <br /> docs not providc an over(low. Scc DCSS Drawing N 210. <br /> a. Hardware cloth or compazable wire mes6 with one-halFinch openings <br /> b. Coazsc aggrcgatc <br /> c. Height l foot or more, l8 inchcs wider than inlet on all sides <br /> d. Place wire mesh ovcr the drop inlet so that the wire extcnds a minimum oC 1 foot beyond <br /> each side of the inlet stcuchue <br /> e. ff more than one strip of inesh is ncccssary,overlap the strips <br /> L Place coarse aggregate over the wire mesh <br /> Volume II—Construction Stormwater Pollution Prevenfion <br /> 3-50 <br />