ARCHIVED REPORTS_THIRD QUARTER 2011 SITE STATUS, REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT

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Table 10 Dual Phase Extraction System-Operating Data Parcel 2A-L&M OU 666 West Weber Avenue,Stockton,CA Period 9r Influent Effluent Hourmeter Totalizer System Volume Average Flow Well Field Operating System Flow VOC VOC VOC' Reading Reading Flow Discharged Flow Rate Rate Temperature Temperature Vacuum Rate [FID] [FID] Removed Date (hours) (gal) al (gal) (gal/day) pm (°F) °F) (inHg) (scfm ppmv ppmv) (Ib/day) pH 12 Notes Constituent Period Vapor Period Liquid Period Total Historical Vapor Historical Liguid Historical Total lbs. gals lbs. gals lbs. gals lbs. gals lbs. lbs. gals SPH - - 6 - 6 - TPHd 6.0 0.84 6.7 0.9 12.7 0.9 6.0 0.84 9,533 9,539 1,328 TPHo - 3.9 0.5 3.9 0.5 - 5,135 5,135 674 TPHg 11.8 1.9 0.1 0.0 11.9 2.0 17,864 2,929 152 18,016 2,954 Benzene 0.08 0.01 0.001 0.00 0.1 0.01 11.85 1.61 0.07 11.92 1.61 MtBE 0.14 0.02 0.001 0.00 0.14 0.02 3.41 0.55 0.02 3.43 0.55 TBA 0.010 0.002 0.0 0.00 - 0.52 0.52 0.08 Equation: [Avg of consecutive(Inf Con-Eff Con)(ppmv)] VOC Removed/day= --------------------------------------------------- X[86.17(g/mole)]X[1 lbs/453.59 g]X[1.2641 moles/1 cf]X[Avg of consecutive flow rates(scfm)]X[60 min/hr]X[24 hr/day] [1,000,000 parts] Definitions: gal=gallons scfm =standard cubic feet per minute PAH=Polycyclic Aromatic Hydrocarbons gpm=gallons per minute VOC=Volatile Organic Compound acfm=actual cubic feet per minute °F=degrees Fahrenheit ppmv=parts per million by volume GAC=Granular Activated Hydrocarbon inHg=inches of Mercury gal=gallons gpm=gallons per minute ATC=Authority to Construct Notes: a =System switched to operate in catalytic mode b=System switched to operate in thermal mode. Column under heading VOC(Hexane)Removed(Ib/day) added 2Q10 to track removal rate of total VOCs. 1 =VOC represented as Hexane(molecular weight 86.17)for VOC vapor mass removal rate calculation. Hexane was used because it was most representative of the lower carbon range organics. 2=System permitted under ATC number N-4878-1-1. Source test for air board. Extracted groundwater being held in onsite holding tank. System shut down following source test. 3=System started for 24-hour collection of vapor PAH samples. 4=System shut down following completion of vapor PAH sample collection. PAH results outside of ATC limits(no detectable PAHs in influent vapor stream);alternate ATC needed to operate. 5=Approximately 5,840 gallons of groundwater stored in holding tank discharged to sanitary sewer. 6=ATC Number N-4878-1-2 issued 7/20/2004.System restarted. 7=Source test for air board. System shut down following source test due to on-site excavation activities. 8=Samples collected from wastewater treatment system.Carbon change-out needed. 9=System shut down following completion of vapor PAH sample collection. 10=System non-operational since 5/2005.No sampling and no discharge activities occurred. 11 =System effluent sampled on 7/6/2005 following startup. 12=Start-up on fresh GAC 13=pH measurement recorded in the field beginning December 9,2009. 14=Hourmeter and totalizer readings recorded on Feb 4,2010,all else occurred on Feb 5,2010. 15=System shut down on August 28,2010 due to the failure of the oil-water seperator transfer pump. Repairs were made and the system was restarted on October 4,2010. 16=System hour meter was replaced. DPE wells were closed during pilot test conducted from 11/16/10 to 11/19/10. No well field temperature or flow rate were collected;therefore,values from the most recent visit with the same system vacuum was used instead(07/12/10). I:\Tidewater\TW Stockton(P2A)\Engineering\O&M\Tables\O&M Tables 201 1\3Q1 1\Parcel 2A OM Tables 3Q11.xlsx Page 3 of 3