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Monitoring Alternative 2 <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 />