Ariz. Admin. Code § R18-9-E314 - 4.14 General Permit: Sewage Vault, Less Than 3000 Gallons Per Day Design Flow

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.

Notes

Ariz. Admin. Code § R18-9-E314

New Section adopted by final rulemaking at 7 A.A.R. 235, effective January 1, 2001 (Supp. 00-4). Amended by final rulemaking at 11 A.A.R. 4544, effective November 12, 2005 (05-3). Amended by final rulemaking at 29 A.A.R. 1023, effective 6/19/2023.