ARCHIVED REPORTS XR0001163 - Laserfiche WebLink

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Ms Lori Duncan Protect No 880-039 1 A 01010000 April 19, 2005 Page 3 MW-4R-D, and VW-1D through VW-4, benzene ranged from 2 b to 10,000 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 07, 2005 varied from about -12 to -13 feet mean sea level and indicated a trough that trended downward to the northeast, superimposed upon a broader eastern flow Groundwater analytical data are summarized on Table 1 TPHg and benzene concentrations are shown on Figure 3 REMEDIATION SYSTEM STATUS The site groundwater remediation system consists of soil vapor extraction (SVE) wells, from which soil vapors are extracted using a Catalytic Oxidizer Start up of the remediation system occurred on February 3, 2000, under the supervision of regulatory personnel The remediation system was shut-down on October 1, 2004 due to fiscal constraints and has remained off since that time The County of San Joaquin was notified about the shut-down 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 Ibsld TPHg destruction efficiency 0% TPHg emission rate to atmosphere 0 Ibsld ' benzene removed since startup(estimate) 4 9 lbs benzene removed during this reporting period 0 lbs Benzene Destruction Efficiency 0% Benzene emission rate to atmosphere 0 Ibsld Average flow rate for this reporting period 0 SUM System uptime during this reporting period None ' N lsacD M20WPg\880\8800391 A Sac doc SHAW ENVIRONMENTAL, INC