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<br /> January 24,2014
<br /> Cardno ERI 2789C.Q134 Former Mobil Service Station 99CAS,Stockton,California
<br /> REMEDIAL OPERATIONS
<br /> Cardno ERI installed an AS/SVE remedial system at the site during first quarter 2012. On March 27, 2012,
<br /> Cardno ERI started the SVE system for compliance testing, as required by the San Joaquin Valley Air Pollution
<br /> Control District (SJVAPCD). The SVE system was shut down pending laboratory results. On April 9, 2012, the
<br /> SVE system was started for continuous operation. Operation of the AS system began on May 8, 2013.
<br /> The AS/SVE system consists of an 11.5-horsepower regenerative blower capable of a maximum flow rate of
<br /> 350 cfm; 11 SVE wells; an electric catalytic oxidizer; an AS air compressor capable of providing up to 10 cfm
<br /> ambient air to 11 AS wells at timed intervals; and associated conveyance piping, noise abatement equipment,
<br /> control devices, and instrumentation. The AS/SVE system extracts soil vapor from up to 11 SVE wells (SVE1,
<br /> SVE2, SVE4, SVE5, VEW1S, VEW1D, VEW2S, VEW2D, VEW3, VEW4, and MW4) and uses eight AS wells
<br /> (AS1, AS2S through AS6S, DW1, and DW3) to inject ambient air into the shallow aquifer and five AS wells
<br /> (AS2D through AS6D) to inject ambient air into the deep aquifer. Soil vapor is treated through an electric
<br /> catalytic oxidizer prior to discharge into the atmosphere under SJVAPCD Permit to Operate No. N-8251
<br /> (permit). Cardno ERI performs system maintenance and monitors the system as required by the permit.
<br /> Cardno ERI collects vapor samples for laboratory analysis to evaluate system performance and calculate
<br /> hydrocarbon removal rates.
<br /> During the reporting period, influent TPHg concentrations ranged from 1,200 mg/m3 to 2,600 mg/m3. Cardno
<br /> ERI initiated operation of the shallow AS wells on October 1, 2013. The AS system is currently operating on all
<br /> AS wells. Cardno ERI will continue to evaluate operation of the AS system to maximize mass removal by
<br /> adjusting timed sparge intervals to the operating AS wells.
<br /> System start-up date: 03/27/12 (SVE), 05/08/13(AS)
<br /> System discharge permit: SJVAPCD Permit to Operate N-8251
<br /> System reporting period: 09/05/13- 12/04/13
<br /> Days operated: 66 out of a possible 90 days
<br /> 09/05/13-09/18/13 SVE1, SVE2, SVE4, SVE5, VEW1A, VEW1B, VEW2A,
<br /> VEW21B, VEW3, VEW4, MW4
<br /> 09/18/13- 10/15/13 SVE1, SVE2, SVE4, SVE5, VEW1A, VEW1B, VEW2A,
<br /> VEW213, VEW3, VEW4
<br /> 10/15/13- 10/29/13 SVE1, SVE2, SVE4, SVE5, VEW1A, VEW1B, VEW2A,
<br /> VEW213, VEW3, VEW4, MW4
<br /> 10/29/13- 12/04/13 SVE1, SVE2, SVE4, SVE5, VEW1A, VEW2A, VEW213;
<br /> VEW3, VEW4
<br /> AS wells used: 09/05/13- 10/01/13 AS2D, AS3D, AS4D, ASSD, AS6D
<br /> 10/01/13- 10/18/13 AS1, AS3S through AS6S, AS2D through AS6D, DW1, DW3
<br /> 10/18/13- 12/04/13 AS1, AS2S through AS6S, AS2D through AS6D, DW1, DW3
<br /> System modifications during reporting period: None
<br /> System status during reporting period: Active
<br /> Laboratory: Calscience Environmental Laboratories, Inc.
<br /> Garden Grove, California
<br /> Effluent analyses EPA Method TO-3(M) TPHg
<br /> performed: EPA Method TO-15M BTEX, MTBE
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