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It is important to recognize that each option is assumed to be equally protective of public health and the environment. com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. 38 Chapter One Exceptional-quality (EQ) biosolids. 1 ■ The ceiling concentration (mg/kg) for pollutants may not be exceeded. ■ The pollutant concentration limits (mg/kg) may not be exceeded. 5). 13). Once biosolids meet EQ requirements, they are not subject to the landapplication general requirements or management practices described in the 40 CFR Part 503 rule.
Public contact sites are defined as lands with a high potential for contact by the public, such as public parks, ball fields, cemeteries, plant nurseries, turf farms, and golf courses. If treated septage is to be applied to a public contact site, the septage is considered a sewage sludge and must meet the more extensive requirements of the 40 CFR Part 503 rule, including (1) general requirements, (2) pollutant limits, (3) management practices, (4) operational standards covering pathogen-reduction criteria and vector attraction reduction requirements, (5) monitoring requirements, (6) recordkeeping, and (7) reporting requirements.
The first alternative uses crop, grazing, and site restrictions exclusively with no chemical treatment, while the second alternative requires raising the pH of the septage to 12 for 30 minutes through chemical addition. For septage land appliers who choose the second alternative to meet pathogen-reduction criteria, the chemicals most commonly used to raise the pH of domestic septage are hydrated lime (Ca(OH)2) and quicklime (CaO). Regardless of the chemical chosen, at a minimum, two separate representative samples of the chemically treated domestic septage must be taken 30 minutes apart to verify that the pH remains at a value of 12 or higher for that time period.