ARCHIVED REPORTS_MONTHLY STATUS REPORT - APRIL 2013

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Stantec Monthly Status Report - May 2013 Chevron Facility #92033 - Stockton Charter Way Commingled Plume No . CP0057 June 14 , 2013 USTs or fuel dispensers are present on the property . The United Gas — branded service currently consists of a station building , a car wash , four fuel dispenser islands , and four USTs . The Site lies at an elevation of approximately 12 feet (ft) above mean sea level on flat terrain . The area surrounding the Site is of mixed residential and commercial use . SVE System Description The construction of the AS/SVE remediation system at Chevron Facility #92033 was completed on February 15 , 2013 . The SVE system was operated on March 14 , 2013 for initial startup vapor sampling under the supervision of San Joaquin Valley Air Pollution Control District (SJVAPCD ) personnel and was shut down pending SJVAPCD Authority to Construct (ATC ) compliance verification . On April 2 , 2013 , City of Stockton completed the final building inspections on the AS/SVE remediation system . The SVE system consists of six vapor extraction wells (VE- 1 through VE-6 ) and a Product Recovery Management of Durham , North Carolina ( PRM ) vapor extraction and thermal -catalytic oxidizer system . The PRM SVE system includes an 80 gallon moisture separator tank , 3/4- hp transfer pump , a 10- hp positive displacement main blower, and a 1 - hp combustion blower housed in a sound enclosure and a skid - mounted thermal -catalytic oxidizer capable of processing flow rates up to 300 standard cubic ft per minute (scfm ) with a 440 , 000 British thermal units ( Btu ) per hour gas burner and a 15 . 5 ft high stack . The main blower extracts soil vapors from the vapor extraction wells through the moisture separator tank . Liquid collected in the moisture separator tank will be transferred periodically into a 55- gallon drum or a truck- mounted tank using the transfer pump . The thermal - catalytic oxidizer uses natural gas as supplemental fuel to treat extracted soil vapors prior to emission to the atmosphere under SJVAPCD ATC No . N - 8790 - 1 - 0 . SVE System Operation The SVE system operated in May 2013 with the following system alarms . On May 6 , 2013 , the SVE system was shut down due to a high oxidizer temperature alarm and was restarted the same day . On May 7 and May 19 , 2013 , the SVE system was shut down due to a low vacuum alarm and was restarted during the next site visit . On May 14 , 2013 , the SVE system was shut down due to a low oxidizer temperature alarm and was restarted two days after. Based on current system information , the alarms may be due to issues with the fan temperature controller inside the SVE enclosure or the program logic controller. Further troubleshooting is necessary to identify what is causing the system alarms . Field notes and field parameter readings including flow rates , vapor concentrations , vacuums , pressures , and temperatures are summarized in Table 1 and are included in Attachment A . SVE System Vapor Sampling In order to monitor the effectiveness of the SVE system and verify permit compliance , vapor samples are collected monthly at the oxidizer influent and at the stack effluent . Stantec collected influent and effluent vapor samples on May 24 , 2013 and submitted to Kiff Analytical LLC of Davis , California for analyses of total petroleum hydrocarbons as gasoline (TPHg ) , benzene , toluene , ethylbenzene , total xylenes , and methyl tert- butyl ether ( MTBE ) by Environmental Protection Agency Method 8260B . Influent and effluent vapor analytical results are summarized in Tables 2 and 3 . Well status summary is included in Table 4 . Certified laboratory analytical reports and Stantec Lab Validation Forms are included as Attachment B . Stockton Charter Way Commingled Plume Monthly Status Report - May. doc 2