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Geological Teckales Inc. Page 9 Groundwater Monitoring Report Project No.750.2 April 1,2005 Middleton, San Joaquin Valley Air Pollution Control District (SJVAPCD) on September 24, 2004. During the initial inspection Ms. Middleton requested that the initial laboratory sample analysis be submitted to the SJVAPCD in accordance to the Authority to Construct: N-4546- 2-1 Section 15 (ATC). Ms. Middleton stated that the submission of monthly and annual reports is not required. As per the ATC, records of all site activities, field measurements, laboratory results and other compliance requirements are kept by GTI and are available for SJVAPCD inspection upon request. During the November 30, 2004, monitoring event elevated Organic Vapor Meter (OVM) readings were encountered. It was determined that water was forming in the carbon vessels due to elevated heat created by the blower. The water was removed from the vessels and V ambient air was passed through the carbon units for fourteen days to dry out the carbon. The removed water was stored in 55-gallon drums until disposal was arranged. During the second week of December 2004, Del-Tech personnel reconfigured the SVE system so that it pulls the vapor through the vessels prior to contacting the blower. This procedure eliminated the heat added to the air stream via the blower and reduced the amount of condensation in the carbon vessels. Del-Tech also replaced the rotometer with a more accurate sensor-type air speed indicator. The SVE system was reconfigured as of December 16, 2004 and the system has been in continuous operation since December 17, 2004. The carbon in the lead carbon vessel was pumped out by US Filters — Westate of Red Bluff, California on March 1, 2005. The spent carbon was removed from the site under profile number W50101AC. The carbon vessel was refilled with reactivated carbon on the same date. The carbon vessels were then reconfigured so the vessel with the new carbon (formerly the lead vessel) became the lag vessel. The reconfiguration assured the maximum protection against emissions of petroleum hydrocarbons to the atmosphere. The system is scheduled to be shut down on April 15, 2005. 4.1 System Efficiency The SVE system is operated under the authority of the San Joaquin Valley Unified Air Pollution Control District's (SJVUAPCD) Authority-to-Construct (N-4546-2-1). The efficiency data calculated from laboratory analytical data collected during the 1" quarter of 2005 are summarized in the table below: