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1 But <br /> iMr James L Barton <br />' July 12, 2004 <br /> Page 3 <br />' Soil Vapor Extraction System Status <br /> Since starting the remedial system in November 1999, the thermal oxidizer has operated for a <br /> 1 total of 6,410 hours and removed approximately 8,462 pounds of petroleum hydrocarbons from <br /> impacted soil and groundwater <br /> On September 30, 2003, Environmental Audit, Inc of Placentia, CA (EAI) recommended that <br /> the SVE system be shut down In a letter dated October 23, 2003, the RWQCB concurred with <br /> EAI's recommendation to shut down the SVE system and to continue to operate the AS system <br /> in a pulse operational mode <br /> A summary of SVE system operational parameters, destruction efficiencies, and mass flow <br /> rates are presented in Tables 4 through Table 9, respectively <br />' Air Sparging System Status <br /> The AS system typically operates in a pulse operations mode (week on / week off basis) The <br /> sparge compressor only operated intermittently between May 1" and June 141h 2004 due to <br /> necessary repairs On June 15th a major service was performed on the sparge compressor <br /> Following the major service, the system was returned to pulse operations mode According to <br /> the hour meter on the AS system, it has operated for approximately 13,412 hours since <br /> remediation at this site began in November 1999 <br />' Effectiveness of Remedlation System <br /> System effectiveness is evaluated by assessing groundwater data from monitoring wells MW-2, <br />' MW-3, MW-11, and MW-12 Concentrations of TPHg, benzene, and MtBE in groundwater <br /> samples collected from selected wells screened in Unit A or Unit B are depicted graphically on <br /> cross section A-A' (Attachment E) Concentrations of TPHg, benzene, and MtBE in <br />' groundwater samples collected from selected wells screened across Unit A, Unit B and Unit D <br /> are depicted graphically on cross-section B-B' (Attachment E) Graphs of TPHg concentrations, j <br /> benzene concentrations, and groundwater elevation versus time are included in Attachment F <br />' Soil vapor samples were collected from selected SVE wells and monitoring wells utilized for the <br /> SVE system Samples collected during the second quarter 2004 were submitted to Air Toxics <br />' LTD in Folsom, California for analyses of VOCs by Modified EPA Method TO-3 Historical <br /> analytical results for soil vapor samples collected from selected wells are summarized in <br /> Table 10 Tabular results of recent soil vapor sampling analytical results are summarized in <br /> Table 11 Copies of the laboratory analytical results with chain-of-custody documentation are <br /> included in Attachment D <br /> J IPruiectsO694015098 2937inaARepoTW2nd Qtr 04-QMR RSRQnd Qtr 04-QMR doc <br /> 1 <br />' ivy �C led �,^ef1�r� v �=�vrrormr�r,ta SP+vce <br />