Current through Register Vol. 30, No. 38, September 20, 2024
A. A 4.14
General Permit allows for the use of a sewage vault that receives sewage.
1. An applicant may use a sewage vault if a
severe site or operational constraint prevents installation of a conventional
septic tank and disposal works or any other on-site wastewater treatment
facility allowed under this Article; or
2. An applicant may install a sewage vault as
a temporary measure if connection to a sewer or installation of another on-site
waste-water treatment facility occurs within two years of the connection or
installation.
B.
Performance. An applicant shall:
1. Not allow
a discharge from a sewage vault to the native soil or land surface,
and
2. Pump and dispose of vault
contents at a sewage treatment facility or other sewage disposal mechanism
allowed by law.
C. Notice
of Intent to Discharge. The applicant shall comply with the Notice of Intent to
Discharge requirements in
R18-9-A301(B) and
R18-9-A309(B),
except that a site investigation under
R18-9-A309(B)(1)
is not required if the reason for using a sewage vault is an operational
constraint that exists irrespective of the results of a site investigation
conducted under
R18-9-A310(B).
D. Design requirements. In addition to the
requirements in
R18-9-A312, an applicant shall:
1. Install a sewage vault with a capacity
that is at least 10 times the daily design flow determined by
R18-9-A314(4)(a)(i),
2. Use design elements to prevent the
buoyancy of the vault if installed in an area where a high groundwater table
may impinge on the vault,
3. Test
the sewage vault for leakage using the procedure under
R18-9-A314(5)(d).
The tank passes the water test if the water level does not drop over a 24-hour
period,
4. Install an alarm or
signal on the vault to indicate when 85 percent of the vault capacity is
reached, and
5. Contract with a
person who licensed a vehicle under 18 A.A.C. 13, Article 11 to pump out the
vault on a schedule specified within the contract to ensure that the vault is
pumped before full.
E.
Installation, operation, and maintenance requirements. The applicant shall
comply with the applicable installation, operation, and maintenance
requirements in
R18-9-A313(A) and
(B).
F. Reference design.
1. An applicant may use a sewage vault that
achieves the performance requirements in subsection (B) by following a
reference design on file with the Department.
2. The applicant shall file a form provided
by the Department for supplemental information about the proposed storage vault
with the applicant's submittal of the Notice of Intent to Discharge.
