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c7cological Tecfmics 11tc. Page 8 Interim Remedial Action Plan Project No.723.2 March 7,2005 3.1.3 System Control & Monitoring The wells will be plumbed to a manifold so that vacuum influence can be varied between the three extraction wells. GTI will perform monitoring of the system to obtain maximum contaminant removal efficiency and compliance with regulatory permits. This will include: • Gauges on individuals wells to measure vacuum; • Gauges on the piping connection between the various GAC units to measure pressure drop across the system; • Air flow measurements for mass removal calculations; • Water flow measurements for mass removal calculations; • Sampling ports on both influent and effluents of dual phase extraction system, air stripper and carbon units. Monit02Jg-af-the-dual-phase-extrac4system-will-take place aily-faT-4he_.fiirst week, Fwee _for the rerr�' der_of the_first..mont biweekly for the nextyth -Sampling will be conducte and at intervals spe ified -SJ`VUAPCD permit(s). This includes effluents from both the thermal oxidizer treatment unit and the carbon system treating the effluent from the air stripper (see section 3.2.2 below). The carbon system monitoring will include effluent samples from the lead/intermediate units to detect contaminant breakthrough. 3.1.3.1 Vapor Monitoring/Sampling Procedure The methods and procedures used for collecting the vapor extraction data for determining contaminant mass and maximizing system efficiency are as follows: ❑ The air velocity will be measured with a Solomat 500e Multifunctional Environmental Instrument. The total extracted airflow velocity will be measured by inserting a manometer pitot tube probe into a port on the system manifold and reading the value displayed by the instrument. The air flow from individual wells will also be measured in a similar fashion. ❑ Vacuum in extraction wells will be measured by gauges. ❑ The vacuum pressure in nearby monitoring wells will be measured by attaching an airtight cap to the well top. The cap will have an orifice that accepts the pressure- measuring instrument. The peak value is recorded after the reading has stabilized. Wells showing response to vacuum pressure will demonstrate the vadose zone pneumatic conductivity. ❑ Organic vapor meter (OVM) readings will be obtained from each extraction well at the system manifold. The vacuum will be adjusted between the wells to promote maximum removal efficiency. ❑ A vacuum pump will be used to collect combined vapor samples at the system manifold. ❑ A log of system activities and measured settings will be kept for each monitoring event and a copy kept on site.