COMPLIANCE INFO_1995-2006 - Laserfiche WebLink

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Method Description The process is described in the following steps: •- Preparation • Probe Array Installation • Inoculation • Sample Collection • Sample Analysis • Leak Location • Reporting Preparation Upon arrival at the site, the Tracer crew reviews the tank information that has been made available and uses this information to plan the installation of the sampling probe array. If as built plans or site plans have not been made available the crew inspects all accessible portions of the system to learn as much as possible about the location of all UST system components. If the site is under remediation, soil vapor extraction systems, air sparging systems and bio -venting systems must be turned off during the test. Probe Array Installation Sampling probes consisting of %" schedule 40 PVC are installed within ten horizontal feet of all possible leak locations (each probe has a twenty foot diameter sphere of influence). Probes are installed by coring a hole in the pavement and inserting a sampling probe into the excavation zone of the tank or pipe using soft excavation techniques. The top of each probe is fitted with a PVC sampling cap that will be used later for soil vapor extraction. Tanks Tank probes are installed along the outer long -side of each tank, generally at a depth within two feet of the tank bottom (or just above the water table if applicable). Each tank will have at least two probes per long side (except for tanks 1,000 gallons or less). Tanks within the same tank pit may share probes placed between tanks. Additional shallow probes (generally one foot in depth) may also be installed near appurtenances along the tank ridge, but these are not required, but highly recommended in order to assist in identifying the source of potential vapor leaks. In situations where tank pits do not contain engineered backfill (pea -gravel), the sampling probes are installed within five horizontal feet of all possible leak locations. Please note the details provided in this Work Plan regarding the test specifications, including but not limited to probe placement are considered proprietary confidential information and are considered the property of Tracer Research Corporation and are patent protected and shall only be used for technology evaluation purposes..