ATCP 93.515(1)(b)1. 1. Site information including the name of the business, the street address, and the municipality in which the site is located.

ATCP 93.515(1)(b)2. 2. Tank system information including the department-assigned tank identification number, the site identification number designated by the owner or operator, the tank capacity, the product in the tank, the type of pipe system, and whether there are pipe manifolds in the tank system.

ATCP 93.515(1)(b)3. 3. Test method information including the name of the method or equipment used, the material approval number as issued under s. ATCP 93.130, the date the test was performed, the threshold value used to declare a leak, the rate of volumetric change, whether the final result was a pass or fail, and the name and certification of the technician performing the test.

ATCP 93.515(2) (2) Inventory control.

ATCP 93.515(2)(a) (a) General methodology. Inventory control that is used as the leak detection method shall be conducted in accordance with API 1621 and with this subsection.

ATCP 93.515(2)(b) (b) Prescriptive requirements. Product inventory control shall be conducted monthly and reconciled to detect a leak rate of at least 0.5 percent of throughput on a monthly basis, in the following manner:

ATCP 93.515 Note Note: A leak rate of 0.5 percent is equal to 5 gallons out of every 1,000 gallons of throughput.

ATCP 93.515(2)(b)1. 1. Inventory volume measurements for inputs, withdrawals, and the amount still remaining in the tank shall be recorded each operating day.

ATCP 93.515(2)(b)2. 2. The equipment used shall be capable of measuring the level of product over the full range of the tank’s height to the nearest one-eighth of an inch.

ATCP 93.515(2)(b)3. 3.

ATCP 93.515(2)(b)3.a. a. The inputs shall be reconciled with delivery receipts by measurement of the tank inventory volume before and after delivery.

ATCP 93.515(2)(b)3.b. b. Where tanks are interconnected by a manifold, reconciliation may address all of the interconnected tanks as a group rather than as individual tanks.

ATCP 93.515(2)(b)4. 4. The measurement of any water level in the bottom of the tank shall be electronically or manually gauged to the nearest one-eighth of an inch at least once a month and recorded.

ATCP 93.515(2)(c) (c) Product losses. Tank systems that exceed the losses allowed under par. (b) for 2 consecutive months shall follow the requirements in ss. ATCP 93.575 to 93.585 for assessing and responding to a release.

ATCP 93.515(2)(d) (d) Precision tightness test. A precision tightness test shall be performed in accordance with sub. (4) within 10 business days of notification from the authorized agent or the department for any of the following reasons:

ATCP 93.515(2)(d)1. 1. Failure to provide monthly inventory control data for the past 12 months.

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) (3) Manual tank gauging.

ATCP 93.515(3)(a) (a) Where allowed.

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.b. b. The tank is less than 10 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.