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0 <br /> (b) Must be carefully designed and constructed to insure <br /> performance integrity and to direct a leak to a monitoring well . <br /> b. Interstitial Monitoring in Double-Walled Tanks. <br /> (1 ) Usually either vacuum sensors or fluid sensors. <br /> (2) Must be able to detect leak anywhere in the tanks and in either <br /> of the two walls. <br /> c. Inventory Reconciliation. <br /> (1 ) Daily gauging of product stored by recording product depth at <br /> station's close-of-business and again at start of day. The longer the <br /> period, the more accurate the test. <br /> (a) Record level of product in each tank using gauge, gauge <br /> stick, or automatic gauging systems. <br /> (b) Record of level of water (if any) in each tank. <br /> (2) Inventory Reconciliation/Product Accounting. <br /> (a) Record product sales daily. <br /> (b) Record deliveries to and draw-off from each tank. <br /> (3) Leak Detection Capabilities. <br /> (a) Inventory monitoring system must be capable of detecting <br /> daily apparent product losses exceeding .5% of product stored. <br /> (b) In-tank automatic testing equipment should be capable of <br /> detecting any leak greater than .3 gallon per hour. <br /> (4) All Inventory Records Must Be Kept On File For One Year and <br /> Reviewed Quarterly By Operator for Recognition of Trends Or Conditions <br /> Indicative of Leaks. <br /> (a) Permitting Authority must be provided with quarterly <br /> summaries of inventory monitoring records in annual report. <br /> (b) Apparent losses of product exceeding .75% of product stored <br /> must be reported to Permitting Authority within 24 hours of discovery. , <br /> (c) Permitting Authority may require N.F.P.A. , "Precision Final <br /> Test" to determine tank integrity when reportable product losses cannot be <br /> otherwise explained. <br /> 7 <br />