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+� Cleo kgkoITechnics!►u. "'1 N-.O� Page 7 <br /> Interim Remedial Action Plan <br /> Project No.622.2 <br /> March 28, 2005 <br /> • Gauges on individual wells to measure vacuum; <br /> • Gauges on the piping connection between the various GAC units to measure pressure <br /> drop across the system; <br /> • Air flow measurements for mass removal calculations; <br /> Water flow measurements for mass removal calculations; <br /> • Sampling ports on both influent and effluents of dual phase extraction system and carbon <br /> units. <br /> Monitoring of the dual phase extraction system will take place daily for the first week, <br /> �. weekly for the remainder of the first month, biweekly for the next two months and then <br /> monthly thereafter. Sampling will be conducted at permit startup and at intervals specified <br /> by the SJVUAPCD permit(s). This includes effluent samples from the lead and/or <br /> La intermediate units to detect contaminant breakthrough. <br /> 3.1.3.1 Vapor Monitoring/Sampling Procedure <br /> The methods and procedures used for collecting the vapor extraction data for determining <br /> contaminant mass and maximizing system efficiency are as follows: <br /> ❑ The air velocity will be measured with a Solomat 500e Multifunctional Environmental <br /> Instrument. The total extracted airflow velocity will be measured by inserting a <br /> manometer pitot tube probe into a port on the system manifold and reading the value <br /> displayed by the instrument. The air flow from individual wells will also be measured in <br /> �.. a similar fashion. <br /> o Vacuum in extraction wells will be measured by gauges. <br /> ❑ The vacuum pressure in nearby monitoring wells will be measured by attaching an <br /> �., airtight cap to the well top. The cap will have an orifice that accepts the pressure- <br /> measuring instrument. The peak value is recorded after the reading has stabilized. Wells <br /> showing response to vacuum pressure will demonstrate the vadose zone pneumatic <br /> �. conductivity. <br /> ❑ Organic vapor meter (OVM) readings will be obtained from each extraction well at the <br /> system manifold. The vacuum will be adjusted between the wells to promote maximum <br /> Lo removal efficiency. <br /> ❑ A vacuum pump will be used to collect combined vapor samples at the system manifold. <br /> ❑ A log of system activities and measured settings will be kept for each monitoring event <br /> �• and a copy kept on site. <br /> Vapor samples will be collected in one-liter capacity Tedlar bags and submitted to a state <br /> certified laboratory for BTEX, MTBE and TPH-G analysis by method TO-3. The reporting <br /> limits are listed below. <br /> +i Detection Limits: BTEX MTBE TPH-G <br /> Air ( 1) 0.0032 0.092 0.1 <br />