# COMAR Title 26 — Department of the Environment

## Subtitle 10 — Oil Pollution Control and Storage Tank Management

### Chapter 07 — High Risk Oil Storage Facilities

#### Regulation .03 New Gasoline UST System.

*COMAR 26.10.07.03*

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

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

  (1) If installing Stage II vapor recovery piping, install the Stage II vapor recovery piping in accordance with COMAR 26.10.03.02;

  (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) 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:

    (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

    (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) 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:

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

      (i) Constructed in accordance with COMAR 26.04.04 and Department specifications;

      (ii) Located outside of the excavation zone;

      (iii) In locations that will allow for the determination of groundwater flow; and

      (iv) Placed in areas that are most likely to detect a spill, release, or discharge from the UST system;

    (b) A pressure control system that:

      (i) Is continuously operated;

      (ii) Continuously monitors storage tank pressure;

      (iii) Maintains storage tank pressure at an average negative pressure; and

      (iv) Prevents the release of gasoline vapors to the environment;

    (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:

      (i) Connected to the monitoring pipes and piping system required under §A(3) of this regulation; and

      (ii) Operated continuously to maintain active ventilation of the excavation zone; or

    (d) An alternative method that will detect a spill, release, or discharge of gasoline liquid and vapors from the UST system;

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

  (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) Analyze each collected water sample in accordance with Regulation .05 of this chapter;

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

  (a) A complete laboratory report that includes a copy of the laboratory sample acceptance form, sample chain-of-custody, and laboratory analytical results; and

  (b) A site map identifying each site supply well and groundwater monitoring well located at the oil storage facility; and

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

  (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) If leaks or deficiencies are found during the testing, make necessary repairs in accordance with COMAR 26.10.04.04; and

  (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.