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LG 151-3 BULK FIELD-CONSTRUCTED#D PIPING MONITORING AND COMPIhttp• www.swrcb.ca.gov/—cwphome/ust/1g-151.htm LG 151-3 BULK FIELD-CONSTRUCTED UNDERGROUND STORAGE TANKS (BFCUST) AND PIPING MONITORING AND COMPLIANCE November 23, 1998 To: Local Agencies The purpose of this revision to LG 151 is to update the list of monitoring options for BFCUSTs (includes two additional options 9 and 10). As the technology of leak detection for BFCUSTs improves, it is important to add these new options for the purpose of encouraging tank owners to install more sensitive leak detection systems. Enclosure 1 includes the list of monitoring options for BFCUSTs. These monitoring options were developed in accordance with the provisions of Section 2643(b)(5) of the UST regulations. Enclosure 2 includes the list of monitoring options for bulk piping when compliance with Section 2643(c) requirements is not feasible and practical. These monitoring options were developed in accordance with the Section 25292(d) of Health& Safety Code authorities. We will review test equipment or methods as they are certified and submitted for approval and include them as updates to the Local Guidance Letter 113 (LG 113) document. For third-party certified equipment or test methods that meet the performance criteria for the monitoring options, refer to LG 113 updates. For the latest additions to this list, check our web site (www.swrcb.ca.gov). If you have any questions regarding this letter, please call Ms. Shahla Farahnak of the Division of Clean Water Programs at (916) 227-4350. Sincerely, [Original signed by:] Allan Patton, Manager Underground Storage Tank Program Enclosures [Enclosure 1] STATE WATER RESOURCES CONTROL BOARD MONITORING OPTIONS FOR BULK FIELD CONSTRUCTED UNDERGROUND STORAGE TANKS 1. Monthly monitoring using a third-party certified electronic device (for example, automatic tank gauging system) that is capable of detecting release rates of 0.2 gallons per hour(gph) with at least a 95%probability of detection and not more than a 5% false alarm. 2. Monthly monitoring using a third-party certified equipment/test method that is capable of detecting release rates of 1-2 gph (inclusive)with at least a 95%probability of detection and not more than a 5% false alarm. In addition to monthly monitoring, a tank tightness test that is capable of detecting release rates of 0.1 gph with at least a 95%probability of detection and not more than a 5%false alarm must be performed every other year. 3. Monthly monitoring using a third-party certified equipment/test method that is capable of detecting release rates of larger than 2 gph but equal to or less than 3 gph with at least a 95%probability of detection and not more than a 5% false alarm. In addition to monthly monitoring, a tank tightness test I of 3 1/10/00 3:24 PM