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9 . 9 Table 1. Trace element concentration limits for composts (Provisional, 5/95). Concentrations are total elemental,mg/kg dry weight basis. Arsenic ,� Cadmium 39 r r « « �� Copper 15 �r Lead 0 Mercury 17 Molybdenum Nickel 420 Selenium 36 Zinc 2800 Note on Table 1: The trace element concentration limits listed in Table 1 are for composts applied to cropland at agronomic rates. The values are identical to those in the California Integrated Waste Management Board's composting operations regulatory requirements and the U. S. EPA's high quality pollutant concentration limits for land application of sewage sludge and sewage sludge -containing products (Standards for the Use or Disposal of Sewage Sludge, 40 CFR Fart 503, Federal Register, 2119193). The value for molybdenum is the "ceiling concentration limit" from Part 503. Sampling Requirements: [Insert sampling and analytical protocols consistent with California composting operations regulatory requirements. - note that Part 503 is based on monthly averages for sludge application not compost or co -compost.) Table 2. Compost production and product information to be provided to users. 1 Feedstock materials and percentage by weight or volume at the beginning of composting, d the quantity of any additives or amendments present in the finished product [list of terms will be developed to describe feedstock materials, and will include terms such as yard trimmings, manure, wood chips.] Reason: Will help determine appropriate use of product and provide insight as to what analyses may be important. 2. Average temperature during composting, peak temperature, and length of time at or above average temperature Reason: Determine whether weed seed and pathogen reduction has been accomplished. 3: Composting method (static pile, windrow, in -vessel, other), frequency of turning or aeration, and length of curing phase Reason - Will help determine consistency in composition and biological stability. .