| (H) Leak Testing. At the discretion of the permitting
authority, leak testing using water filled to the inside level of
the tank lid or to the top of the tank riser(s) may be required.
(2) Intermittent sand filters. A typical layout and
cross-section of an intermittent sand filter is presented in §285.90(8)
of this title. Requirements for intermittent sand filters are as follows.
(A) Sand media specifications. Sand filter media must
meet ASTM C-33 specifications as outlined in §285.91(11) of this
title.
(B) Loading rate. The loading rate shall not exceed
1.2 gallons per day per square foot.
(C) Surface area. The minimum surface area shall be
calculated using the formula: Q/1.2=Surface Area (Square Feet), where
Q is the wastewater flow in gallons per day.
(D) Thickness of sand media. There shall be a minimum
of 24 inches of sand media.
(E) Filter bed containment. The filter bed containment
shall be an impervious lined pit or tank. Liners shall meet the specifications
detailed in §285.33(b)(2)(A) of this title (relating to Criteria
for Effluent Disposal Systems).
(F) Underdrains. For gravity discharge of effluent
to a drainfield, there shall be a three inch layer of pea gravel over
a six inch layer of 0.75 inch gravel, that contains the underdrain
collection pipe. When pumpwells are to be used to pump the effluent
from the underdrain to the drainfield, they must be constructed of
concrete or plastic sewer pipe. The pumpwell must contain a sufficient
number of holes so that effluent can flow from the gravel void space
as rapidly as the effluent is pumped out of the pumpwell to the drainfield.
Refer to §285.90(9) of this title.
(c) Proprietary treatment systems. This subsection
does not apply to proprietary septic tanks described in subsection
(b)(1) of this section.
(1) Tank sizing. Proprietary treatment systems that
serve single family residences, combined flows from single family
residences, or multi-unit residential developments shall be designed
using Table II in §285.91(2) of this title unless there is an
equalization tank preceding the aerobic treatment unit. If there is
an equalization tank preceding the aerobic treatment unit, the equalization
tank shall meet the requirements set forth in §285.34(b)(4) of
this title (relating to Other Requirements) and the aerobic treatment
units can be sized using the wastewater flows in Table III in §285.91(3)
of this title. Proprietary Treatment systems for non-residential facilities
shall be sized using the wastewater flows in Table III in §285.91(3)
of this title. Leak testing shall be performed in accordance with
subsection (b)(1)(H) of this section.
(2) Installation. Proprietary treatment systems shall
be installed according to this subchapter. If the manufacturer has
installation specifications that are more stringent than given in
this subchapter, the manufacturer shall submit these specifications
to the executive director for review. If approved by the executive
director, the treatment systems may be installed according to these
more stringent specifications. Any subsequent changes to these manufacturer's
installation specifications must be approved by the executive director
before installation. Inspection, cleanout ports, or maintenance ports
shall have risers installed according to the riser installation provisions
in subsection (b)(1)(D) of this section. Tank excavations shall be
backfilled according to the backfill provisions in subsection (b)(1)(F)
of this section. At the discretion of the permitting authority, leak
testing using water filled to the inside level of the tank lid or
to the top of the riser(s) may be required.
(3) System maintenance. Ongoing maintenance contracts
are required for all proprietary treatment systems except those systems
maintained by homeowners under the provisions of §285.7(d)(4)
of this title (relating to Maintenance Requirements). The maintenance
contract shall satisfy §285.7(d) of this title.
(4) Electrical wiring. Electrical wiring for proprietary
systems shall be according to §285.34(c) of this title.
(5) Approval of proprietary treatment systems. Proprietary
treatment systems must be approved by the executive director prior
to their installation and use. Approval of proprietary treatment systems
shall follow the procedures found in this section. After the effective
date of these rules, only systems tested according to subparagraph
(A) or (B) of this paragraph will be placed on the list of approved
systems. The list may be obtained from the executive director. All
systems on the list of approved systems on the effective date of these
rules shall continue to be listed subject to the retesting requirements
in paragraph (6) of this subsection. In addition, all proprietary
treatment systems undergoing testing under this paragraph on the effective
date of these rules shall be considered for inclusion on the list
of approved systems.
(A) Treatment systems that have been tested by and
are currently listed by NSF International as Class I systems under
NSF Standard 40 (2005) or have been tested and certified as Class
I systems according to NSF Standard 40 (2005), by an American National
Standard Institute (ANSI) accredited testing institution, or under
any other standards approved by the executive director, shall be considered
for approval by the executive director. All systems approved by the
executive director on the effective date of these rules shall continue
to be listed on the list of approved systems, subject to retesting
under the requirements of NSF Standard 40 (2005), and Certification
Policies for Wastewater Treatment Devices (1997) or under any standards
approved by the executive director. The manufacturers of proprietary
treatment systems and the accredited certification institution must
comply with all the provisions of NSF Standard 40 (2005), and Certification
Policies for Wastewater Treatment Devices (1997) or under any standards
approved by the executive director.
(i) Proprietary units under this section have been
approved to treat flows equal to or less than their rated capacity
and with an influent wastewater strength ranging from a 30-day average
Carbonaceous Biochemical Oxygen Demand (CBOD) concentration between
100 milligrams per liter (mg/l) and 300 mg/l and a 30-day average
TSS concentration between 100 mg/l and 350 mg/l.
(ii) Proprietary units may be used as components in
an overall treatment system treating influent stronger than the ranges
listed in this section. However, the overall treatment system will
be considered a non-standard treatment system and shall meet the requirements
set forth in subsection (d) of this section.
(B) Treatment systems that will not be accepted for
testing because of system size or type by NSF International, or ANSI
accredited third party testing institutions, and are not approved
systems at the time of the effective date of these rules, may only
be approved in the following manner.
(i) The proprietary systems shall be tested by an independent
third party for two years and all the supporting data from the test
shall be submitted to the executive director for review and approval,
or denial before the system is marketed for sale in the state.
(ii) The independent third party shall obtain a temporary
authorization from the executive director before testing. The temporary
authorization shall contain the following:
(I) the number of systems to be tested (between 20
and 50);
(II) the location of the test sites (the test sites
must be typical of the sites where the system will be used if final
authorization is granted);
(III) provisions as to how the proprietary system will
be installed and maintained;
(IV) the testing protocol for collecting and analyzing
samples from the system;
(V) the equipment monitoring procedures, if applicable;
and
(VI) provisions for recording data and data retention
necessary to evaluate the performance as well as the effect of the
proprietary system on public health, groundwater, and surface waters.
(iii) Permitting authorities may issue authorizations
to construct upon receipt of the temporary authorization. The owner
must be advised, in writing, that the system is temporarily approved
for testing. If a system fails, regardless of the reason, it shall
be replaced with a system that meets the requirements of this subchapter
by the manufacturer at the manufacturer's expense. A system installed
under this subparagraph is the responsibility of the manufacturer
until the system has obtained final authorization by the executive
director according to this subparagraph.
(iv) Upon completion of the two-year test period, the
executive director shall require the independent third party to submit
a detailed report on the performance of the system. After evaluating
the report, the executive director may issue conditional approval
of the system, or may deny use of the system.
(I) The conditional approval will authorize installations
only in areas similar to the area in which the system was tested.
Cont'd... |
