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Ms Lori Duncan Project No 120221 03000000 September 27, 2006 Page 3 ethylbenzene ranged from 13 gg/L to 1,600 µg/L, and total xylenes ranged from 35 µg/L to 6,300 gg/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 rThe groundwater elevations measured on August 21, 2006, varied from -9 32 to -10 15 feet mean sea level and indicated an overall northeastern 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 IRemediation 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 lbs/d TPHg destruction efficiency Not Applicable TPHg emission rate to atmosphere 0 lbs/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 SUM System uptime during this reporting period None N 7echNiAl20221 Don Rod ersl ts%D&QMCMDRAFr doc SHAW ENVIRONMENTAL,INC 9 RP