| (a) Protection of fresh water. The applicant must demonstrate
that both surface and subsurface fresh water will not be polluted
by the application of wastewater by the subsurface area drip dispersal
system.
(b) Domestic wastewater.
(1) The permittee shall maintain the pH of the effluent
within the limits of 6.0 - 9.0 standard units immediately prior to
dispersal, unless a specific variance is approved by the executive
director based upon site-specific conditions.
(2) When a subsurface area drip dispersal system applies
effluent on land where there is the potential for public contact with
the soil, the permittee shall comply with Effluent Set 4 located in §309.4
of this title (relating to Table 1, Effluent Limitations for Domestic
Wastewater Treatment Plants), or with more stringent effluent limitations
prescribed by the executive director, if warranted to protect human
health or the environment.
(3) When a subsurface area drip dispersal system applies
effluent on land where there is not the potential for public contact
with the soil, the permittee shall comply with Effluent Set 5 located
in §309.4 of this title, or with more stringent effluent limitations
prescribed by the executive director, if warranted to protect human
health or the environment.
(4) Disinfection.
(A) Permittees applying treated effluent to land where
there is the potential for public contact with the soil must disinfect
the effluent prior to it entering the subsurface area drip dispersal
system in accordance with §309.3(g) of this title (relating to
Application of Effluent Sets).
(B) If the effluent is to be transferred to a holding
pond or tank prior to dispersal, the permittee shall ensure that the
effluent meets the relevant criteria of §222.87 of this title
(relating to Effluent Limitations) at the time it enters the distribution
system.
(C) Permittees are allowed to use ultraviolet disinfection
systems only with effluent having a daily average five-day biochemical
oxygen demand concentration and total suspended solids concentration
that are less than 20 milligrams per liter each.
(5) The permittee must comply with requirements other
than those specified in this section, if determined by the executive
director to be necessary to protect human health.
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