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State Water Resources Control Board Linda S.Adams Division of Water Quality Arnold Schwarzenegger Secretary for 1001 I Street,Sacramento,California 95814♦ (916)341-5866 Governor Environmental Protection Mailing Address: P.O.Box 2231,Sacramento,California 95812 FAX(916)341-5808 ♦ Internet Address: http://www.waterboards.ca.gov June 12, 2007 LG 161-4 ENHANCED LEAK DETECTION (Available electronically at httr)://www.waterboards.ca.govlust) To: Local Agencies and Other Interested Persons The purpose of this letter is to provide a general overview of the enhanced leak detection (ELD) requirements and to answer the most common questions regarding ELD that have arisen to date. This letter is intended as a working document and may be periodically updated as new information becomes available and as new questions arise. What is ELD? ELD is a test method that ascertains the integrity of an underground storage tank (UST) system by the introduction and external detection of a substance that is not a component of the fuel formulation stored in that UST system. [Cal. Code Regs., Title 23, § 2644.1 , subd. (a)(1)] The ELD test method must be: • Third-party certified; and • Capable of detecting both vapor and liquid phase releases at a leak rate of at least 0.005 gallons per hour (gph), with a probability of detection of at least 95% and a probability of false alarm no greater than 5%. [Id. § 2644.1 , subd. (a)(2)] Who is required to perform ELD? Owners/operators of UST systems installed prior to July 1 , 20031 and located within 1,000 feet of a public drinking water well must perform ELD. [Health & Saf. Code, §§ 25292.4; 25292.5; Cal. Code Regs., Title 23, §§ 2640, subd. (e); 2644.1, subd. (a)(3)] The SWRCB UST Program is responsible for notifying owners/operators of facilities that are subject to the ELD requirement. • What is a public drinking water well? A "public drinking water well" is a wellhead that: ■ Provides drinking water to a public water system; 2 ■ Is regulated by the State Department of Health Services (DHS); and 1 USTs installed on or after July 1,2003 are those systems that are installed and monitored in accordance with Health and Safety Code,section 25290.1. 2 A"public water system"is a system that provides water for human consumption through pipes or other constructed conveyances that has 15 or more service connections or regularly serves at least 25 individuals daily at least 60 days out of the year.[Health&Sal.Code, § 116275] California Environmental Protection Agency I Recycled Paper