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Ms Lori Duncan Protect No 120221 03000000 July 20, 2006 Page 3 micrograms per liter (µg/L) to 36,000 µg/L BTEX concentrations were reported in samples from the same wells, benzene ranged from 11 pg/l, to 7,100 µg/L MTBE was not detected in any sample during this event Copies of the chain-of-custody records and laboratory analytical report are included in Appendix C The groundwater elevations measured on February 6, 2006, varied from -4 09 to A 196 feet mean sea level and indicated an overall southeastern flow, away from the Port of Stockton Groundwater analytical data are summarized on Table 1 TPHg and benzene concentrations are shown on Figure 3 REMEDIATION SYSTEM STATUS The site remediation system consists of soil vapor extraction (SVE) wells and a Catalytic Oxidizer The remediation system was operated from February 3, 2000, until October 1, 2004 It has remained off since that time, per an understanding with SJCPHS that it was no longer affecting significant cleanup, but would likely be required for use in concert with subsequent groundwater remediation Sampling Results No vapor samples were collected System Performance Status The treatment system did not operate during the reporting period Remediation System Performance Summary TPHg removed since February 3,2000,startup(estimate) 3,244 lbs TPHg removed during this reporting period 0 lbs TPHg daily removal rate during reporting period 0 Ibs/d TPHg destruction efficiency Not Applicable TPHg emission rate to atmosphere 0 Ibs/d Benzene removed since startup(estimate) 4 9 lbs Benzene removed during this reporting period 0 lbs Benzene Destruction Efficiency Not Applicable Benzene emission rate to atmosphere 0 lbs/d Average flow rate for this reporting period 0 SCFM System uptime during this reporting period None usysactpsoo\cor monkTecheub\120221 Don Rodgerawpcs%06 o1\1006 doe SHAW ENVIRONMENTAL,INC,