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What is the sampling frequency for the level and temperature measurements? _ <br />(X) more than once per second <br />( ) at least once per minute <br />( ) every 1-15 minutes <br />( ) every 16-30 minutes <br />( ) every 31-60 minutes <br />( ) less than once per hour <br />( ) variable (explain) <br />> Identifying and correcting for interfering factors <br />How does the ATGS determine the presence and level of the ground water above the <br />bottom of the tank? <br />() observation well near tank <br />( ) information from USGS, etc. <br />O information from personnel on-site <br />(X) presence of water in the tank <br />( ) other (describe briefly) <br />( ) level of ground water above bottom of the tank not determined <br />How does the ATGS correct for the interference due to the presence of ground water <br />above the bottom of the tank? <br />(X) system tests for water incursion <br />( ) different product levels tested and leak rates compared <br />( ) other (describe briefly) <br />( ) no action <br />How does the ATGS determine when tank deformation has stopped following delivery of <br />product? <br />(� wait a specified period of time before beginning test <br />( ) watch the data trends and begin test when decrease in product level has. <br />stopped <br />( ) other (describe briefly) <br />( ) no procedure <br />ATGS - DescripEion Page 4 of 6 <br />