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and indicated that based on the use of the impacted aquifer as a domestic water supply, the groundwater shall not contain concentrations of contaminants of concern that exceed the respective Maximum Contaminant Levels (MCLS) 23 Remedial Well and System Installation rThe lateral ozone injection lines, soil vapor extraction Iines, and remediation compound were installed following installation of the ozone sparge and SVE wells The location of the treatment compound is shown on Figure 3 The SVE lines were stubbed up into a manifold in the treatment compound The initial SVE system consisted of a 500 cubic feet per minute (cfm) blower with a catalytic oxidizer fired by natural gas connected to the SVE well field manifold Soil vapor extraction was initiated at the Site on September 26, 2002, under San Joaquin Valley Air Pollution Control District (SJVAPCD) Authority to Construct number N-4613-1-0 The 20 ozone sparge pipes were stubbed up into a manifold and connected to the 6 cfm ozone sparge skid Ozone spargmg was initiated at the Site on November 20, 2002 The ozone sparge system operated approximately 52% of the time during the Second Quarter reporting period Between March 7 and April 6, 2005, the system operated approximately one day a week due to automatic shutdown by the ozone meter as described below On April 6, 2005, the system was taken . off-line indefinitely On March 7, 2005, moisture was observed in sparge lines downstream of the manifold Upon closer inspection, the moisture originated from atmospheric conditions through the intake of the air sparge pump, upstream of the manifold The moist air mixed with the ozone and precipitated an acid in the flow gauge located between the air sparge pump and the manifold, causing corrosion on the metal parts The corrosion obstructed the flow from the air sparge pump into the manifold The air sparge pump was subsequently shut down for servicing and ozone odors were immediately detected inside the shed resulting in an automatic shutdown of the ozone sparge system An open pressure relief valve on the sparge pump manifold was identified as the probable source of the leak and it was closed After restart of the ozone sparge system, no ozone was detected in the ambient air and the system was operational without the air sparge pump Use of the air sparge pump was discontinued due to the irreparable flow gauge Between March 7 and April 6, 2005, Geocon visited the Site weekly to change chart paper on the SVE system Upon each visit, the ozone generator was off due to automatic shutdown by the ozone meter On each of those dates, the system was re-started and searching for the leak or leaks proved unsuccessful The system remained operational for approximately one day following re-start after each occurrence • Project No S8643-06-01 -3- September 28 2005