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On March 7, moisture was observed in sparge lines downstream of the manifold Upon closer <br /> inspection, the moisture originated from atmospheric conditions through the intake of the air sparge <br /> Pump, upstream of the manifold The moist air mixed with the ozone and precipitated an acid in the <br /> flow gauge located between the air sparge pump and the manifold, causing corrosion on the metal <br /> parts The corrosion obstructed the flow from the air sparge pump into the manifold The air sparge <br /> pump was subsequently shut down for servicing Following shutdown, ozone odors were immediately <br /> ' detected inside the shed The ozone sparge system was shut down An open pressure relief valve on <br /> the sparge pump manifold was identified as the probable source of the leak and it was closed After <br /> restart of the ozone sparge system, no ozone was detected to the ambient air and the system was <br /> operational without the air sparge pump Use of the air sparge pump was discontinued due to the <br /> irreparable flow gauge <br /> Between March 7 and April 6, Geocon visited the Site weekly to change chart paper on the SVE <br />' system as noted above Upon each visit, the ozone generator was off due to automatic shutdown by <br /> the ozone meter On each of those dates, the system was re-started and searching for the leak or leaks <br /> proved unsuccessful The system remained operational for approximately one day following re-start <br /> after each occurrence <br /> On April 6, the ozone generator had again been tripped off due to the ozone meter automatic <br /> shutdown The cause of the leak or leaks in the system remain unidentified As this system failed to <br /> remain operational for more than one day at a time during the prior three weeks, the ozone system <br /> was shut down indefinitely <br />' Historical operational data including well open/closed status, ozone leak detection monitoring data, <br /> and presence of an odor are presented in Table 6 <br /> 3 3 3 Future Work <br /> Future work planned in the remainder of the Second Quarter 2005 includes the following tasks <br />' • Conduct weekly visits to change chart paper and inspect the operational status of the catalytic <br /> oxidizer, <br />' • Perform monthly O&M for the SVE system, <br /> • Meet with SJCEHD to discuss recommendations presented in Section 5 0 <br />' Project No 58643-06-01 -8- May 5.2005 <br />