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• <br />Implementation of this monitoring alternative will require <br />Daily Inventory Reconciliation, Annual Tank Integrity <br />Testing, Pipeline Leak Detection, Vadose Zone or Ground Water <br />Monitoring Wells, and Soil Testing. If this monitoring <br />alternative is chosen, implementation should be carried out <br />as follows: <br />1) Perform the initial tank integrity test/tests to confirm that <br />the tank/tanks do/does not leak at the time of implementation <br />of the monitoring alternative. Integrity testing must be <br />done within one year prior to implementation of the <br />monitoring alternative. Based on information obtained from <br />facility personnel all/the tanks/tank at this facility have <br />passed an integrity test within the last year. <br />Vadose Zone Wells <br />2a) Undisturbed soil samples shall be taken from the soil <br />immediately surrounding each/the tank. The boring/borings <br />shall be drilled to a depth of 40 feet and undisturbed soil <br />samples shall be taken at 5 foot intervals with the last <br />sample obtained from the base of the borings. All samples <br />shall be properly sealed, labeled and preserved until they <br />are delivered to a location where they can be analyzed to <br />determine the presence of any possible hazardous substances <br />that are present. Soil sampling and testing shall be carried <br />out as specified in Section 2645 of the Underground Storage <br />Tank Regulations. <br />3a) If the soil samples obtained are determined to be free of <br />hazardous material a vadose zone monitoring well shall be <br />installed in the vacated boring/borings. Vadose zone <br />monitoring wells shall be designed and installed as specified <br />in Sections 2646 and 2648 of the Underground Storage Tank <br />Regulations. Vadose zone testing shall be performed <br />semi-annually, at a minimum. Three types of vadose zone leak <br />detectors, each of which would be acceptable for use at this <br />site are attached at the end of the package. <br />4a) Implementation of this monitoring alternative will require <br />annual calibration of flow meters by the State of California <br />Bureau of Weights and Measures. <br />