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! <br />! <br /> ' Report—Vapor Extraction/Air Sparge Remedial System Page 9 <br /> Former Bank of Stockton/western Lift Site <br /> 1 Project No. 102.3 <br /> March 25,2005 <br /> 5.0 SYSTEM MONITORING AND MAINTENANCE <br /> The remedial system has been designed for monitored throughout the duration of the <br /> project_ Elements of system monitoring include the following: <br /> i ' 5.1 Process/Effluent Air Monitoring <br /> Gasoline vapor concentrations in the extracted air will monitored with a portable photo <br /> ionization detector (PID). Samples of the process vapor may be collected from sample <br /> ports in any individual well, or the master sample port just upstream of the vapor <br /> extraction regenerative blower. PID measurements will normally be conducted on a <br /> 1 twice-weekly basis and samples for laboratory analysis will be collected monthly and when <br /> major adjustments are made. PID readings and laboratory samples will be taken more <br /> frequently when the wells in active service are being changed. Gasoline concentration will <br /> also be monitored at sample ports installed between the two carbon filters and at the <br /> exhaust stack. <br /> Field air flow measurements will be collected at least weekly using a Dwyer Series 475 ! <br /> digital manometer. Differential pressure will be converted to velocity and then to SCFM ! <br /> of total vapor extracted. The manifold pressure is monitor with permanently installed <br /> Magnahelic gauge. <br /> ' 5.2 Sparge Air Monitoring <br /> The injection rates of individual sparge wells are monitored and regulated by means of <br /> controllable Rotameters just upstream of the sparge wells. The manifold pressure is <br /> monitored by means of a pressure gauge located on the pressure regulator. <br /> r <br /> ' r <br /> r <br /> r <br /> r2937 Veneman Ave., #B240 Geo-Phase Environmental Inc. Phone(209)569-0293 <br /> Modesto, CA 95356 Fax(209) 569-0295 <br />