California Code of Regulations › Title 23 - Waters › Division 3 - State Water Resources Control Board and Regional Water Quality Control Boards › Chapter 16 - Underground Tank Regulations › Article 3 - New Underground Storage Tank Design, Construction, and Monitoring Requirements › Section 2632 - Monitoring and Response Plan Requirements for New Underground Storage Tanks Constructed Pursuant to Section 2631

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a)
				  This section is applicable only to underground storage tanks constructed
				  pursuant to the requirements of section
				  2631.
(b) Owners or operators of underground
				  storage tanks subject to this section shall implement a monitoring program
				  approved by the local agency and specified in the underground storage tank
				  operating permit. The program shall include interstitial space monitoring as
				  described in subdivision (c) and shall include the items listed in subdivision
				  (d).
(c) Monitoring of the
				  interstitial space shall include either visual monitoring of the primary
				  containment system as described in subdivision (c)(1) or one or more of the
				  methods listed in subdivision (c)(2).
(1) A
				  visual monitoring program shall incorporate all of the following:
(A) All exterior surfaces of the underground
				  storage tanks and the surface of the floor directly beneath the underground
				  storage tanks shall be capable of being monitored by direct viewing.
(B) Visual inspections shall be performed
				  daily, except on weekends and recognized state and/or federal holidays.
				  Inspections may be more frequent if required by the local agency or the local
				  agency may reduce the frequency of visual monitoring at facilities where
				  personnel are not normally present and inputs to and withdrawals from the
				  underground storage tanks are very infrequent. In these instances, visual
				  inspection shall be made weekly. The inspection schedule shall take into
				  account the minimum anticipated time during which the secondary containment
				  system is capable of containing any unauthorized release and the maximum length
				  of time any hazardous substance released from the primary containment system
				  will remain observable on the surface of the secondary containment system. The
				  inspection schedule shall be such that inspections will occur on a routine
				  basis when the liquid level in the tanks is at its highest. The inspection
				  frequency shall be such that any unauthorized release will remain observable on
				  the exterior of or the surface immediately beneath the underground storage
				  tanks between visual inspections. The evaluation of the length of time the
				  hazardous substance remains observable shall consider the volatility of the
				  hazardous substance and the porosity and slope of the surface immediately
				  beneath the tanks.
(C) The liquid
				  level in the tank shall be recorded at the time of each inspection.
(D) If any liquid is observed around or
				  beneath the primary containment system, the owner or operator shall, if
				  necessary, have the liquid analyzed in the field using a method approved by the
				  local agency or in a laboratory to determine if an unauthorized release has
				  occurred. The owner or operator shall have a tank integrity test conducted, if
				  necessary, to determine whether the primary containment system is leaking. If a
				  leak is confirmed, the owner or operator shall comply with the applicable
				  provisions of Article 5, Article 6, and Article 7.