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.03/07/95 09:40 $503 224 7820 WOODWARD -CLYDE 0007/022 <br /> • <br /> greatest) currently route water from roofs and on -site paved areas exclusively to dry <br /> wells. <br /> ThereYis no written guidance provided to contractors and property owners regarding <br /> proper construction and maintenance of stormwater quality facilities to ensure optimum <br /> continued performance. <br /> Recommendations for Interim Guidance for On -Site Controls <br /> Recommendations for use of available guidance materials as an interim measure are <br /> provided for the following categories of controls: <br /> • Stormwater Filters <br /> • Infiltration Facilities <br /> • Stormwater Ponds and Marshes (Wetlands) <br /> • Structural Facilities for Oil and Grease and Sediment Control <br /> • Erosion Control <br /> Every attempt has been made to locate suitable guidance for applicability and selection <br /> of facilities, pollutant removal efficiencies, design, construction, landscaping and <br /> vegetation, short and long -term maintenance, costs and secondary benefits (e.g., <br /> recreation, habitat). Note that the reference materials published by other public <br /> agencies and groups vary in their contents. For example, some manuals include cost <br /> information, others don't. For this reason, a variety of references may be <br /> recommended for a single category or type of control_ <br /> The discussion below provides descriptions for the facilities and justification or <br /> rationale for the recommendations; that is, why a particular reference manual is <br /> recommended or not recommended. <br /> In addition to the standard reference manuals available, Tom Schueler of the Center <br /> for Watershed Protection in Washington DC and leading technical experts around the <br /> country continue to present the most recent fmdings and guidance in the periodic <br /> publication, Watershed Protection Techniques. This is an excellent publication and we <br /> recommend that each of the City staff involved in plan review and permit checking <br /> have their own subscription for their personal reference libraries. To date, only two <br /> issues have been published: February 1994 and Summer 1994. Reference is made to <br /> Techniques throughout this memorandum. <br /> S\945042na \task0200 \onsitc conrnols\techmem.ck 6 <br />