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( h ) Underground storage tank quantity measurements shall be based on liquid level measurements which are: ( 1 ) Performed during periods when no additions or withdrawals are being made to the underground storage tank; ( 2 ) Performed by the underground storage tank owner, operator, or other designated persons who have had appropriate training; ( 3 ) Based on the average of two readings if stick or tape measurements are used: ( 4 ) Determined by equipment capable of measuring the level of the product over the full range of the tank's height to the nearest one-eighth of a inch; ( 5 ) Determined by equipment capable of measuring, to the nearest one-eighth of an inch, water present in the bottom of the underground storage tank. If the underground storage tank is not level, and the measurements are taken manually, then the measurement should occur at the lowest end of the underground storage tank; ( 6 ) Measured at the center of the longitudinal axis of the underground storage tank if access is available or measured at the lowest end of the underground storage tank with a calibration measurement at both ends, if possible, to determine if any underground storage tank tilt exists and, if so, its magnitude; and ( 7 ) Converted to volume measurements based on a calibration chart for the underground storage tank. This chart shall, where feasible, take into account the actual tilt of the underground storage tank. ( i ) The daily variation in inventory reconciliation shall be the difference between physically measured inventory in storage and the calculated inventory in storage. The physically measured inventory shall be determined at approximately the same time each day by taking liquid level measurement and converting it to gallons using the calibration chart. The calculated inventory shall be determined at approximately the same time of day for each business day by adding the inputs and subtracting the withdrawals from the physically measured inventory determined the day before. These variations shall be summed for a period of one month. Monthly variations exceeding a variation of 1.0 percent of the monthly tank delivery plus 130 gallons must be investigated in accordance with this section. ( j ) The owner or operator shall, on an annual basis, submit a statement to the local agency which states that all inventory reconciliation data are within allowable variations or which includes a list of the period of times and the corresponding variations which exceed the allowable variations. Said statement shall be executed under penalty of perjury. ( k ) If the monthly inventory reconciliation, conducted under subsection (i) of this section, exceeds the allowable variation, the owner or operator as appropriate shall: ( 1 ) Notify the local agency of a suspected unauthorized release within 24 hours of completing any inventory reconciliation which exceeds the allowable variation; ( 2 ) Within 24 hours of discovering a variation which exceeds the allowable variation, review the inventory records for the preceding 30 days and determine if a calculation error exists that caused the apparent excessive variation.