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A sheen of product was observed in monitoring well 14W-3 16 The water samples were analyzed for TPHg following EPA Method 8015 and for BTEX and FOCs ' following EPA Method 8260 33 Remediation System Operation and Maintenance and Performance Summary Operation and maintenance (O&M) of the remediation system is performed monthly (or as needed) Photo ionization detector(PID) readings from the SVE effluent and influent is performed monthly as ' required by the San Joaquin Unified Air Pollution Control District (SJUAPCD) A chart recorder provides a continuous chart of the catalytic oxidizer temperature As required by SJUAPCD, the chart paper is changed out on a weekly basis A brief description and performance evaluation of the ' remedial system for the reporting period is presented below ' 3 3 1 SVE System The SVE system is comprised of a skid-mounted 250-cfin blower and catalytic oxidizer(ECAT-250) with knockout pot manifolded to ten SVE wells (V-1 through V-10) During the reporting period the SVE system was approximately 45% operational On January 9, 2004 Geocon mobilized an electric fired catalytic oxidizer with a 300 cubic feet per minute (cfm) blower (ECAT 300) to the subject site The ECAT 300 was started on Friday January 16, 2004 in the presence of San Joaquin County Unified Air Pollution Control District (SJCUAPCD) At that time the system was operating with a flow rate of approximately 230 cfm Air samples were collected from the influent and effluent air streams for submittal to an analytical laboratory In addition, field readings of the contaminant concentration in the influent and effluent were measured with a photolonization detector (PID) The PID reading for the influent was ' approximately 32 parts per million (ppm) and the effluent was between 3 and 9 ppm On Monday January 19, 2004, Geocon received the analytical data for the samples collected on lanuary 16, 2004 The laboratory reported that the influent total petroleum hydrocarbon as gasoline (TPHg) concentration was 140 parts per nntllion volurne (ppmv) and the effluent TPHg concentration ' was 41 ppmv Based on a flow rate of 230 cfin, the percent destruction was 71% and the emissions were 2 95 pounds per day of TPHg The Authority to Construct (ATC — permit to operate from SJUAPCD) conditions requrie either 95% destruction or less than 2 pounds emissions per day Geocon troubleshot the ECAT 300 and determined that untreated soil vapor was getting past the catalytic cell and entering the exhaust stack before itgot t the thermal chamber Repairs were made to the system, and on January 26, 2004, Geocon met with to restart systern and collect additional samples Once the samples weie collected the system as shut down until the analytical data was ' received PIOIL.,t No S8643-06 01 -6- July 1 2004