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y <br />Monitoring Alternative 2 <br />h <br />Implementation of this Monitoring Alternative shall require <br />Vadose Zone Monitoring, Ground Water Monitoring, and Soil <br />Testing. If this monitoring alternative is chosen, <br />implementation should be carried out as follows: <br />1) Undisturbed soil samples shall be taken from all exploratory <br />borings drilled for the purpose of installing either Vadose <br />Zone or Ground Water Monitoring Wells. The boring/borings <br />performed for installation of the vadose zone monitoring <br />wells should be drilled to a depth such that the base of the <br />boring is located above the perennial high ground water <br />level. Proposed locations for such borings are shown on the <br />attached site plan. <br />2) Borings performed for the purpose of installing ground water <br />monitoring wells shall be drilled to a depth such that the <br />base of the boring is a minimum of 20 feet below the level of <br />the perennial ground water table or 15 feet below the base of <br />the tank/tanks (whichever is lowest). The borings shall be <br />located along the perimeter of the tank cluster as shown on <br />the attached site sketch, or the boring shall be located as <br />close as possible to the tank as shown on the site sketch <br />attached to the end of this package. <br />3) Soil samples shall be taken from all borings at 5 foot <br />intervals, in the zone above the water table. Samples should <br />be taken from the base of all borings terminated above the <br />water table. All samples shall be properly sealed, labeled, <br />and preserved until they are delivered to a location where <br />they can be analyzed to determine the presence of any <br />possibly hazardous substances. Soil sampling and testing <br />shall be carried out as specified in Section 2645 of the <br />Underground Storage Tank Regulations. <br />4) If the soil samples obtained are determined to be free of <br />hazardous material both the Vadose Zone and the ground water <br />monitoring wells shall be installed and monitored as <br />specified in Sections 2646, 2647, and 2648 of the Underground <br />Storage Tank Regulations. Ground water testing shall be <br />performed semi-annually at a minimum. Frequency of Vadose <br />Zone monitoring will depend on the monitoring equipment being <br />used. If the vadose zone is being monitored by a vapor <br />detection system, testing shall be performed daily at a <br />minimum. If the vadose zone is being monitored by other type <br />of detection system, such as soil -pore liquid monitoring, <br />testing shall be performed weekly at a minimum. , <br />