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Stantec <br /> Monthly Status Report - May 2013 <br /> Chevron Facility #92033 - Stockton Charter Way Commingled Plume No . CP0057 <br /> June 14 , 2013 <br /> AS System Operation <br /> The AS system operated in May 2013 with the following system alarms . On May 6 , 2013 , the <br /> AS system shut down due to an aftercooler high temperature alarm . Stantec adjusted the AS <br /> system air compressor variable frequency drive from approximately 60 to 45 hertz to generate <br /> less heat at the aftercooler. On May 8 and May 16 , 2013 , the AS system shut down due to SVE <br /> system alarms . On May 16 , 2013 , Stantec found oil on the air compressor exhaust vent , which <br /> may indicate a leak in the air compressor shaft seal . The manufacturer was contacted and <br /> restarting the AS system is pending manufacturer inspection/repair under warranty . The <br /> manufacturer will be scheduled for inspection/repair in June 2013 . In order to optimize sparging <br /> in the subsurface of the Site , the AS system is currently programmed to sparge in pulsed mode <br /> and cycle through three groups with overlapping time interval specified in the table below . Field <br /> notes and field parameter readings including flow rates and pressures are summarized in Table <br /> 5 and are included in Attachment A . <br /> AS SYSTEM PULSE MODE <br /> Group Sparge Wells Time Interval <br /> 1 AS- 1 , AS - 10 , AS. 11 , and AS- 12 23 : 40-04 : 00 , 11 : 40- 16 : 00 <br /> 2 AS- 3 , AS-6 , AS -8 , and AS-9 03 : 40-08 : 00 , 15 : 40-20 : 00 <br /> 3 AS-2 , AS4 , AS - 5 , and AS -7 07 : 40- 12 : 00 , 19 : 40-24 : 00 <br /> AS System Performance <br /> The AS system operated in May 2013 with the sparge pressure to each sparge well below its <br /> respective fracture pressure (Table 3 ) . Sparge manifold pressure ranged from 10 to 22 psi and <br /> sparge manifold flow ranged from 4 to 22 . 8 scfm . <br /> AS SYSTEM OPERATION AND PERFORMANCE <br /> Equipment inventory : AS with 15 hp , 60 scfm at 30 psi air compressor <br /> Reporting period : May 2013 (April 26 through May 16 , 2013 ) <br /> Period total flow rate (scfm ) : Average : 48 <br /> Period after- cooler pressure ( psi ) : Average : 20 . 4 <br /> Period operating hours : 355 / 74 % of scheduled runtime <br /> Operating hours since startup : 392 / 74 % of scheduled runtime <br /> Minimum Average Maximum <br /> Period well manifold pressure ( psi ) : 10 16 . 3 22 . 0 <br /> Period well manifold flow (scfm ) : 4 . 0 10 . 8 22 . 8 <br /> Remediation Recommendation <br /> Based on the system data , Stantec recommends continuous operation , maintenance , and <br /> optimization of the AS and SVE remediation system . <br /> Recent Correspondence <br /> No recent correspondence was received in May 2013 . <br /> This Month 's Activities (May 2013) <br /> 1 . Stantec operated the AS/SVE system located at Chevron Facility #92033 . <br /> Stockton Charter Way Commingled Plume Monthly Status Report - May. doc 4 <br />