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1 <br /> Ms Lon Duncan Project No 120221 03000000 <br /> 16 August 3, 2006 <br /> Page 3 <br /> from wells MW-4RS and VW-1D through VW-31), benzene ranged from 130 p,g/L to <br /> 8,000 [.g/L MTBE was not detected in any sample during this event and has not been detected <br /> since 1997 Copies of the chain-of-custody records and laboratory analytical report are included <br /> in Appendix C <br /> The groundwater elevations measured on May 8, 2006, varied from -8 72 to -9 63 feet mean sea <br /> level and indicated an overall southeastern flow, away from the Port of Stockton Groundwater <br /> analytical data are summarized on Table 1 TPHg and benzene concentrations are shown on <br /> Figure 3 <br /> REMEDIATION SYSTEM STATUS <br /> The site remediation system consists of soil vapor extraction (SVE) wells and a Catalytic <br /> Oxidizer The remediation system was operated from February 3, 2000, until October 1, 2004 <br /> 1 It has remained off since that time, per an understanding with SJCPHS that it was no longer <br /> affecting significant cleanup, but would likely be required for use in concert with subsequent <br /> groundwater remediation <br /> Sampling Results <br /> No vapor samples were collected <br /> System Performance Status <br /> The treatment system did not operate during the reporting period <br /> Remediation System Performance Summary <br /> TPHg removed since February 3,2000,startup(estimate) 3,244 lbs <br /> TPHg removed during this reporting period 0 lbs <br /> TPHg daily removal rate during reporting period 0 Ibsld <br /> TPHg destruction efficiency Not Applicable <br /> TPHg emission rate to atmosphere . 0 Ibs/d <br /> Benzene removed since startup(estimate) 4 9 lbs <br /> Benzene removed during this reporting period 0 lbs <br /> Benzene Destruction Efficiency Not Applicable <br /> Benzene emission rate to atmosphere 0 Ibs/d <br /> Average flow rate for this reporting period 0 SUM <br /> System uptime during this reporting period None <br /> N1TechPub1120221 Don RodgerslRplsW6 Q212Q06-f doc SHAW ENVIRONMENTAL,INC <br />