An owner of a new gasoline UST system, except for a new gasoline UST system in a HRGUA located in Anne Arundel County, shall:

1. A. Comply with the following release prevention and detection requirements for a newly installed UST system:

   1. (1) If installing Stage II vapor recovery piping, install the Stage II vapor recovery piping in accordance with COMAR 26.10.03.02;
   2. (2) Install and utilize an interstitial release detection system for the UST system piping approved by the National Work Group on Leak Detection Evaluations;

   3. (3) If the UST system has a storage capacity of greater than 2,000 gallons or there are multiple USTs installed in a shared excavation zone:

      1. (a) Install four monitoring pipes in accordance with the specifications in COMAR 26.10.03.04B, with one monitoring pipe located in each corner of the excavation zone; and
      2. (b) In conjunction with the monitoring pipes required under §A(3)(a) of this regulation, install a piping system that is designed to allow for active ventilation of the excavation zone; and

   4. (4) Select and, upon receipt of Department approval, install one of the following systems to detect a spill, release, or discharge of gasoline liquid and vapors from the UST system:

      1. (a) A minimum of three monitoring wells that are:

         1. (i) Constructed in accordance with COMAR 26.04.04 and Department specifications;
         2. (ii) Located outside of the excavation zone;
         3. (iii) In locations that will allow for the determination of groundwater flow; and
         4. (iv) Placed in areas that are most likely to detect a spill, release, or discharge from the UST system;

      2. (b) A pressure control system that:

         1. (i) Is continuously operated;
         2. (ii) Continuously monitors storage tank pressure;
         3. (iii) Maintains storage tank pressure at an average negative pressure; and
         4. (iv) Prevents the release of gasoline vapors to the environment;

      3. (c) If the UST system excavation zone meets the conditions of §A(3) of this regulation by either having a storage capacity of greater than 2,000 gallons or multiple USTs installed in a shared excavation zone, a soil vapor extraction system that is:

         1. (i) Connected to the monitoring pipes and piping system required under §A(3) of this regulation; and
         2. (ii) Operated continuously to maintain active ventilation of the excavation zone; or
      4. (d) An alternative method that will detect a spill, release, or discharge of gasoline liquid and vapors from the UST system;

2. B. Within 30 days of installing a UST system, and annually thereafter:

   1. (1) Sample each site supply well and groundwater monitoring well located at the oil storage facility using a method approved by the Department; and
   2. (2) Analyze each collected water sample in accordance with Regulation .05 of this chapter;

3. C. Within 60 days after conducting a sample collection in accordance with §B of this regulation, submit the following documents to the Department:

   1. (a) A complete laboratory report that includes a copy of the laboratory sample acceptance form, sample chain-of-custody, and laboratory analytical results; and
   2. (b) A site map identifying each site supply well and groundwater monitoring well located at the oil storage facility; and

4. D. Upon completing the installation, replacement, repair, or upgrade of a UST system and before placing the UST system in operation:

   1. (1) Test all primary piping that does not contain liquid gasoline, tank top fittings, Stage II piping, riser pipes, and vent piping using a helium pressure test, or other test approved by the Department, in accordance with procedures prescribed by the Department;
   2. (2) If leaks or deficiencies are found during the testing, make necessary repairs in accordance with COMAR 26.10.04.04; and
   3. (3) Upon completion of a repair, retest the UST system in accordance with §D(1) of this regulation to ensure the UST system does not leak.

Authority: Environment Article, §§4-401, 4-402, 4-405, 4-407—4-411.2, 4-415.1, 4-417, and 4-701 et seq., Annotated Code of Maryland

Effective date: February 4, 1991 (18:2 Md. R. 151)

Chapter revised effective November 4, 1996 (23:22 Md. R. 1498)

Regulation .01 repealed and new Regulations .01—.08 adopted effective June 13, 2022 (49:12 Md. R. 642)