COMPLIANCE INFO_PRE 2019 - Laserfiche WebLink

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