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J Soil pH Use an accredited soil -testing laboratory to test the pH of the soil and ask the laboratory to provide information on how to adjust the soil pH, should that be necessary. To find accredited soil testing laboratories, see attachments. A nursery can provide specific information about suitable pH for landscape plants. Here are optimal soil pH ranges for various plant types: Lawns — 5.5 to 7.5 pH Shrubs (except acid -tolerant plants) — 5.5 to 7.0 pH Acid -Tolerant Shrubs (Rhododendrons, Azaleas, Mountain Laurels, Camellias, Blueberries, native plants) — 4.5 to 5.5 pH Annual Flower and Vegetable Gardens — 6.0 to 7.0 pH Compost and Topsoil Calculation Worksheet for the Pre -approved Amend- ment Rate Compost sold in Washington must comply with state standards for compost quality found in the state solid waste rule (WAC 173-350-220). Compost sources include both permitted compost facilities and facilities that do not require permits because they are exempt under the state rule. Some compost facilities produce compost and topsoil mixes, and topsoil supply companies may use compost produced elsewhere to create topsoil mix products. To achieve the post -construction soil standard, topsoil mixes must contain organic matter content of ten percent dry weight in planting beds, and 5% organic matter content (based on a losson-ignition test) in turf areas, and a pH from 6.0 to 8.0 or matching the pH of the original undisturbed soil. The topsoil layer shall have a minimum depth of eight inches except where tree roots limit the depth of incorporation of amendments needed to meet the criteria. Subsoils below the topsoil layer should be scarified at least 4 inches with some incorporation of the upper material to avoid stratified layers, where feasible. Permit applicants that compost their own material at a maximum of 250 cubic yards of compost on site at any one time, may use that material for a project, provided the ap- propriate tests are conducted and docu- mented. In addition to the annual testing required by WAC 173-350-220, tests must include: 1) organic matter content (range: 35 -65%); and, if using a custom compost amendment rate, compost bulk density (lbs./ cubic yard dry weight). Resources Permitted Compost Facili- ties For a list of permitted compost facilities, see the Washington State Department of Ecology Web site, and click on "Permitted Compost Facilities": http:// www.ecy.wa.gov/progi,ai-ns/swfa/ compost/ Soil Testing Laboratories For a list of accredited soil testing laboratories and guidance on obtaining soil tests: http://www.SoilsforSalmon.org