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�BFi79&CLEARWATER <br />' c R o u P <br /> Evvirrommenta[ SerVices <br />' <br /> through the course of the proposed remedial activities to document and verify clean-up efficacy <br />' In addition, Clearwater will continue with quarterly field measurements of DO, ORP, and pH, to <br /> be performed concurrently with the groundwater monitoring events Additional laboratory <br />' analyses for bio-attenuation parameters will be periodically conducted along with the regular <br /> quarterly monitoring analyses to monitor biodegradation activity, and to evaluate for possible <br />' relocation of system components, nutrient requirements, and other system adjustments <br />' 7.3 Monitoring Equipment Requirements <br /> Application of the infusion technology requires the use of specific equipment to monitor the air <br />' flow rate being supplied to the groundwater and regulate the pressure at which oxygen is <br /> delivered At the infusion wells, high range DO/ORP meters will be used An example of these <br />' meters are sold by Point Four Systems, Inc At surrounding monitoring wells, a typical DO <br /> meter will be adequate In addition, a dual stage low flow (0-4psi) pressure regulator and a low <br /> air flow meter will be used The type of regulator predominantly used is a Victor 2-stage low- <br /> flow #GP270 or equivalent available from Thermadyne The appropriate air flow meter is a Cole <br /> Parmer Model P-03217 available from Cole Partner Instrument Company Miscellaneous fittings <br /> and supplies are available from the manufacturer Compressed air cylinders will be obtained <br /> from local industrial gas suppliers <br /> Following startup of oxygen infusion, groundwater DO concentrations in the infusion wells will <br /> be monitored at two-week intervals until a relatively constant DO is reached in the infusion <br /> wells, DO monitoring will then be performed quarterly along with the groundwater sampling <br /> events Each of the quarterly sampling events will consist of collecting groundwater samples <br /> from the remaining network of monitoring wells for analysis of TPHg, BTEX and MTBE using <br /> EPA Method 8260B <br /> After concentrations decline to levels amenable to remediation by natural -attenuation, without <br /> the aide of enhanced oxygen infusion, the gas cylinders will be disconnected The 1SOC units <br /> ZB 178C RAP 24 May 18,2004 <br />