GAC20 definition

GAC20 means granular activated carbon filter beds with an empty-bed contact time of 20 minutes based on average daily flow and a carbon reactivation frequency of every 240 days.
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GAC20 means granular activated carbon filter beds with an empty-bed contact time of twenty minutes based on average daily flow and a carbon reactivation frequency of every two hundred forty days.
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GAC20 means granular activated carbon filter beds with an empty-bed contact time of 20 minutes based on average daily flow and a carbon reactivation frequency of every 240 days. (40 C.F.R. §141.2 (July 1, 2011))
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Examples of GAC20 in a sentence

  • For compliance with the MCLs for TTHM and HAA5 as LRAAs, the following are the BATs: enhanced coagulation or enhanced softening, plus GAC10; GAC20, as defined in section 5-1.1 of this Subpart; or nanofiltration with a molecular weight cutoff less than or equal to 100 Daltons.

  • This step is implemented similarly to the “GAC10 + Settled Water Ozone” step except that GAC20 is used instead of GAC10.

  • The “GAC20” SWAT decision tree step applies to the same plants and is implemented in the same fashion as the “GAC10” step with the following exceptions:• This step applies to plants with an existing GAC system of any size, not just plants with GAC systems characterized as less aggressive than GAC20.

  • GAC20 means granular activated carbon filter beds with an empty-bed contact time of 20 minutes based on average daily flow and a carbon reactivation frequency of every 240 days.

  • Therefore technologies shift toward more advanced treatments due to the operational difficulties of ozone and chlorine dioxide.• GAC20 is judged to be preferred over GAC10 for smallest systems.With no additional Crypto inactivation requirements, slightly less overall use of advanced technologies is predicted for small systems.

  • The “GAC20 + Chlorine Dioxide” step applies to all plants with initial technology level less than or equal to the “GAC20 + Chlorine Dioxide,” except for:• Plants with ozone in initial process trains (such plants would skip directly to the “GAC20 + Raw Water Ozone” decision tree step) • Softening plants• Small systemsThis step is implemented in the same manner as the “GAC10 + Chlorine Dioxide” step, except a GAC20 system is added instead of a GAC10 system.

  • The “GAC20 + Raw Water Ozone” step applies to all plants with initial technology level less than or equal to “GAC20 + Raw Water Ozone,” except for:• Softening plants• Small systemsThis step is implemented in the same manner as the “GAC10 + Raw Water Ozone” step, except a GAC20 system is added instead of a GAC10 system.

  • The “GAC20 + UV” step applies to all plants with initial technology level less than or equal to “GAC20 + UV,” except for:• Plants with ozone in initial process trains (such plants would skip directly to the “GAC20 + Raw Water Ozone” decision tree step) • Softening plants• Small systemsThis step is implemented in the same manner as the “GAC10 + UV” step, except a GAC20 system is added instead of a GAC10 system.

  • Comment:The following treatment technique requirements need to be added: 40 CFR 141.2 definitions of GAC10 and GAC20, 40 CFR 141.64(a)(2), 40 CFR 141.64(b)(1)(ii), 40 CFR 141.64(b)(2)(ii - ii).

  • Total trihalomethanes--enhanced coagulation and GAC10, or GAC20; with chlorine as the primary and residual disinfectant.


More Definitions of GAC20

GAC20 means granular activated carbon filter beds with an empty-bed contact time of 20 minutes based on average daily flow and a carbon reactivation frequency of every 240 days."Governmental entity" means the Commonwealth, a town, city, county, service authority, sanitary district or any other governmental body established under the Code of Virginia, including departments, divisions, boards or commissions.
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GAC20 means granular activated carbon filter beds with an empty-bed contact time of twenty
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Related to GAC20

  • GAC10 means granular activated carbon filter beds with an empty-bed contact time of 10 minutes based on average daily flow and a carbon reactivation frequency of once every 180 days, except that the reactivation frequency for GAC10 used as a best available technology for compliance with the TTHM and HAA5 MCLs monitored pursuant to section 64534.2(d) shall be once every 120 days.

  • Maritime agency services means activities consisting in representing, within a given geographic area, as an agent the business interests of one or more shipping lines or shipping companies, for the following purposes:

  • Crosswalk means that part of a roadway at an intersection included within the connections of the

  • PM2.5 means particulate matter with an aerodynamic diameter less than or equal to a nominal 2.5 micrometers as measured by a reference method based on 40 CFR Part 50 Appendix L and designated in accordance with 40 CFR Part 53 or by an equivalent method designated in accordance with 40 CFR Part 53.

  • Waterway means any body of water.

  • Maritime cargo handling services means activities exercised by stevedore companies, including terminal operators, but not including the direct activities of dockers, when this workforce is organised independently of the stevedoring or terminal operator companies. The activities covered include the organisation and supervision of:

  • SITC means the Standard International Trade Classification, Revision 3 (SITC, Rev. 3), published by the United Nations in Statistical Papers, Series M, No. 34/Rev. 3 (1986);

  • wharf includes any jetty structure;