18 AAC 60.470. Sewage solids

(a) The requirements of this section apply to the owner or operator of a sewage solids monofill. If a sewage solids monofill is located within the boundaries of a MSWLF, it is considered co-disposal with municipal solid waste, and the requirements of this section do not apply. If sewage solids are co-disposed of in a MSWLF, the owner or operator shall meet the requirements of 18 AAC 60.365.

(b) Waste placed in a sewage solids monofill must be dewatered and contain at least 10 percent solids by weight. Sewage or septage less than five percent solids by weight will be regulated as wastewater under 18 AAC 72. Sewage or septage that is five percent or more, but less than 10 percent, solids by weight may be handled as wastewater or dewatered to contain at least 10 percent solids by weight.

(1) 500 or more feet from the property line of the facility, sewage solids may not be disposed of in the monofill if they contain arsenic, chromium, or nickel in concentrations greater than

(A) the limits established in Table E of this subsection; or

(B) site-specific limits established under (d) of this section; or

(2) less than 500 feet from the property line of the facility, sewage solids may not be disposed of in the monofill if they contain arsenic, chromium, or nickel in concentrations greater than

(A) the limits established in Table F of this subsection; or

(B) site-specific limits established under (d) of this section.

TABLE E MAXIMUM ALLOWABLE POLLUTANT CONCENTRATIONS IN SEWAGE SOLIDS PLACED IN A MONOFILL WITHOUT A LINER AND LEACHATE COLLECTION SYSTEM AND WITH A BOUNDARY 500 OR MORE FEET FROM THE FACILITY PROPERTY LINE Concentration Pollutant (milligrams per kilogram*) Arsenic 73 Chromium 600 Nickel 420 *Dry weight basis

TABLE F MAXIMUM ALLOWABLE POLLUTANT CONCENTRATIONS IN SEWAGE SOLIDS PLACED IN A MONOFILL WITHOUT A LINER AND LEACHATE COLLECTIONS SYSTEM WITH A BOUNDARY LESS THAN 500 FEET FROM THE FACILITY PROPERTY LINE Unit boundary to POLLUTANT CONCENTRATION* property line Arsenic Chromium Nickel distance (feet) (mg/kg) (mg/kg) (mg/kg) 0 to less than 82 30 200 210 82 to less than 164 34 220 240 164 to less than 246 39 260 270 246 to less than 328 46 300 320 328 to less than 410 53 360 390 410 to less than 492 62 450 420 * Dry weight basis

(d) The owner or operator of a sewage solids monofill without a liner and leachate collection system may secure from the department site-specific pollutant limits by demonstrating, in a permit application, that site-specific limits are appropriate for that monofill because the limits of Table E or F, whichever is applicable, are not necessary to protect public health or the environment.

(e) If a sewage solids monofill does have a liner or leachate collection system, the

(1) system must be operated and maintained while the monofill is active and for five years after closure; and

(2) leachate must be collected and disposed of in accordance with the applicable requirements of 18 AAC 72 for the same period.

(f) Except as provided in a permit issued under 33 U.S.C. 1342 (Clean Water Act, section 402) and certified by the department, an active sewage solids monofill may not be located

(1) within 200 feet of a fault that has had displacement in Holocene time;

(2) in an unstable area; or

(3) in a wetland.

(g) The owner or operator shall maintain a minimum horizontal distance of 50 feet between the active sewage solids monofill and the facility's property line.

(h) Sewage solids may not be placed in a sewage solids monofill if likely to adversely affect a threatened or endangered species listed under 16 U.S.C. 1533 (Endangered Species Act, section 4) or its designated critical habitat. "Adversely affect" has the meaning developed under 16 U.S.C. 1536 (Endangered Species Act, section 7) and regulations adopted under that section.

(i) When sewage solids are placed in a monofill, the vector attraction reduction requirement in 40 C.F.R. 503.33(b)(11) must be met or one of the

(1) Class A or Class B pathogen reduction requirements of 40 C.F.R. 503.32 must be met; and

(2) vector attraction reduction requirements in 40 C.F.R. 503.33 (b)(1) - (b)(10) must be met.

(j) In addition to other applicable monitoring provisions of this chapter, the following monitoring requirements apply to a sewage solids monofill:

(1) the monitoring frequency set out in Table G of this subsection must be met for

(A) arsenic, chromium, and nickel concentrations in the solids being deposited in the monofill;

(B) the pathogen density requirements set out in 40 C.F.R. 503.32; and

TABLE G FREQUENCY OF MONITORING - SEWAGE SOLIDS MONOFILL Amount of sewage solids 1 Frequency (tons per 365-day period) Greater than zero but less than 330 Once yearly Equal to or greater than 330 Once each quarter (4 times yearly) but less than 1,650 Equal to or greater than 1,650 Once every 60 days (6 times yearly) but less than 16,500 Equal to or greater than 16,500 Once monthly (12 times yearly) 1 Amount of sewage solids placed in a sewage solids monofill (dry weight basis).

(2) after the sewage solids monofill has been monitored for two years at the frequency in Table G, the monitoring frequency for pollutants and pathogens may be reduced, but in no case may it be less than once in each year that sewage solids are placed in the monofill; and

(3) the owner or operator of a sewage solids monofill containing more than 2,500 cubic yards of solid waste must establish a continuous explosive gas monitoring station in any building closer than 500 feet from the solid waste disposal area.

(k) The owner or operator of a sewage solids monofill shall develop the following information and retain it for at least five years:

(1) the concentration of arsenic, chromium, and nickel determined under (j) of this section; and

(2) a record of how the requirements of this section are being met.

( l ) A food crop, feed crop, or fiber crop may not be grown on an active sewage solids monofill unless the owner or operator demonstrates that, through management practices, public health and the environment are protected from any reasonably anticipated adverse effect of a biological organism in, or a hazardous constituent of, the sewage solids.

(m) Animals may not be grazed on an active sewage solids monofill unless the owner or operator demonstrates that, through management practices, public health and the environment are protected from any reasonably anticipated adverse effect of a biological organism in, or a hazardous constituent of, the sewage solids.

(n) In addition to the requirements of 18 AAC 60.245, the owner or operator of a sewage solids monofill shall submit a written closure and post-closure plan to the department at least 180 days before a monofill will be closed, and shall include, at a minimum,

(1) a description of the final cover and how it will be designed to meet the requirements of (o) of this section, prevent the release of pathogens or hazardous constituents, account for settling or subsidence of the monofill, and resist erosion to prevent damage to the final cover;

(2) a discussion of how the leachate collection system will be operated and maintained for at least three years after the monofill closes, if the monofill has a liner and a leachate collection system;

(3) a description of the system used to monitor for methane gas as required by (j)(3) of this section; and

(4) a discussion of how public access to the monofill will be restricted for at least three years after the facility is closed.

(o) The final cover must

(1) consist of soil or another material approved by the department;

(2) be at least 24 inches thick or another thickness approved by the department;

(3) be graded to promote drainage without erosion or ponding; and

(4) be revegetated.

(p) After completion of the final cover, the owner or operator of a sewage solids monofill with a groundwater monitoring system shall conduct detection monitoring at the frequency required by 18 AAC 60.850(b) .

History: Eff. 1/28/96, Register 137; am 7/11/99, Register 151; am 9/7/2002, Register 163

Authority: AS 44.46.020

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