ATCP 93.515(2)(d)2.2. Incomplete or inconsistent data entry reflected during any 2 months of data entry out of the most recent 3 months of inventory control record keeping. ATCP 93.515(3)(a)1.1. Manual tank gauging may be used as the sole method of leak detection for tanks that have a capacity of 1,000 gallons or less for the life of the tank. ATCP 93.515(3)(a)2.2. For tanks that have a capacity of more than 1,000 gallons to 2,000 gallons, manual tank gauging may be used if all of the following conditions are met: ATCP 93.515(3)(a)2.a.a. The tank system has a precision tightness test performed in accordance with sub. (4) at least once every 5 years from the date of installation until the tank is ten years old. ATCP 93.515(3)(a)2.c.c. The piping either receives an annual precision tightness test or has electronic line leak detection testing, and this tightness test or leak detection testing is performed in accordance with the capabilities specified in s. ATCP 93.130 (3) (b). ATCP 93.515(3)(a)3.3. Tanks which have a capacity of more than 1,000 gallons to 2,000 gallons and which are more than 10 years old shall be provided with monthly monitoring in accordance with sub. (5), (6), or (7). ATCP 93.515(3)(a)4.4. Tanks that have a capacity of more than 2,000 gallons may not use manual tank gauging as the method of required leak detection. ATCP 93.515(3)(b)(b) Manual tank gauging procedures. Manual tank gauging shall meet all of the following requirements: ATCP 93.515(3)(b)1.1. Liquid level measurements shall be taken with a gauge stick that is marked to measure the liquid to the nearest one-eighth of an inch over the full range of the tank’s height. ATCP 93.515(3)(b)2.2. Tank liquid level measurements shall be taken at the beginning and ending of the test duration periods given in Table 93.515, during which no liquid may be added to or removed from the tank and shall be based on the average of 2 stick readings taken at both the beginning and ending of the period. ATCP 93.515(3)(b)3.3. A leak is suspected and subject to the requirements of ss. ATCP 93.575 to 93.585 if the variation between beginning and ending measurements exceeds the weekly or monthly standards in Table 93.515. Table 93.515
1 Requires precision tightness testing every 5 years. This method is only allowed until the tank is 10 years old.
ATCP 93.515(4)(a)(a) Precision tightness testing shall be conducted in one of the following ways: ATCP 93.515(4)(a)1.1. By a certified tank system tightness tester, using methods approved under s. ATCP 93.130 to perform precision tightness testing for tanks or piping. ATCP 93.515 NoteNote: The approval criteria in s. ATCP 93.130 include capability of detecting a leak rate of 0.1 gallons per hour. ATCP 93.515(4)(a)2.2. With permanently installed leak detection equipment as approved under s. ATCP 93.130 to perform precision tightness testing for tanks or piping. ATCP 93.515(4)(b)(b) Where a certified tank system tightness tester is used, the tester shall include the date and the beginning and end times in the test results report. ATCP 93.515(4)(c)(c) Precision tightness testing of double-wall underground product piping shall include testing of both the inner and outer wall. ATCP 93.515(4)(d)(d) Precision tightness testing shall be recorded on the department’s tank precision tightness testing form, TR-WM-152, or line tightness testing form, TR-WM-125, as applicable and shall be maintained onsite in accordance with s. ATCP 93.500 (9) (a). Alternative forms may be used with the permission of the department. ATCP 93.515(5)(5) Automatic tank gauging. Automatic tank gauging shall meet all of the following requirements: ATCP 93.515(5)(a)1.1. No more than 30 days may elapse between monthly monitoring tests using an automatic tank gauge.
