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Linda S. Adams Secretary for Environmental Protection June 12, 2007 E E • 11111!11111TT 111M I 10011 Street, Sacramento, California 95814♦ (916) 341-5866 Mailing Address: P.O. Box 2231, Sacramento, California 95812 FAx (916) 341-5808 ♦ Internet Address: http://www.waterboards.ca.gov LG 1614 ENHANCED LEAK DETECTION (Available electronically at httr)://www.waterboards.ca.gov/ust) 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%. [1d. § 2644.1, subd. (a)(2)] Who is required to perform ELD? Owners/6pelrat6rs of UST systems installed prior to July 1, 20031 and located within 1,000 feetof 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 SW RCB 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 Prdtection Agency 0 Recycled Paper