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Imay"* Z41 Monitoring alternative 9 is part of the proposed amendments to the Underground Storage Tank Regulations. Assuming these regulations are adopted, this alternative would be applicable. Implementation of this monitoring alternative will require Daily Inventory Reconciliation, Rate of Volume Change testing, Annual Tank Integrity testing, and Pipeline Leak detection. If this monitoring alternative is chosen, implementation should be carried out as follows: 1) Perform the initial tank integrity test/tests to confirm that the tank/tanks do/does not leak at the time of implementation of the monitoring alternative. Integrity testing must be done within one year prior to implementation of the monitoring alternative. Based on information obtained from facility personnel all/the tanks/tank at this facility have passed an integrity test within the last year. 2) Daily Inventory Reconciliation shall be accomplished using a tank level monitor (automated liquid level monitoring equipment). This tank level monitor shall be capable of monitoring the volume of fuel in the tank and performing the required rate of volume change testing. The tank level monitor shall meet the minimum requirements as specified in Section 2641, Subsection C -9(D and E) of the proposed amendments to the Underground Storage Tank Regulations Allowable daily inventory variation and the frequency of rate of volume change testing shall be dependent upon which monitoring schedule is chosen from Section 2641 Table 4.3. Further refinement of the specifications required for complying with this monitoring alternative are outlined in Section 2641 Monitor Alternative 9. Specifications regarding three types of tank level monitors, each of which should be suitable for use at this facility, are attached at the end of this package. 3 Implementation of this monitoring alternative will require annual calibration of flow meters by the State of California Bureau of Weights and Measures. 4) Pipeline leak detection requirements can be accomplished by visual inspection since the method of product delivery is by suction pump. Monitoring shall be as described in Appendix II of the Underground Storage Tank Regulations. 5) Tank integrity testing to determine that total product loss from the tank does not exceed 0.05 gallons per hour, shall be performed every three years. Integrity testing shall be carried out as specified in Section 2643 of the Underground Storage Tank Regulations.