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Soil Vapor Extraction and Air Sparging Performance Monitoring Plan Stockton Yard Maintenance Facility,Stockton Page 2-4 2.3 Reporting and Recordkeeping Requirements for SVETS PMP records must be maintained for at least 2 years following the date that data is recorded. Following the two-year period,the data may be archived but should not be destroyed. Any destruction of records must be done per approval from regulatory agencies. The SVETS will be permitted to operate by the San Joaquin Valley Unified Air Pollution Control District (SJVUPCD). A copy of this permit will be included in Appendix F when obtained. Monthly sampling is required as discussed in Section 2.2,PMP Site Inspection. Permit limits will be included in this manual when the permit is acquired.Any permit exceedances and corresponding corrective actions taken must also be reported to the SJVUPCD. In case of exceedance of Or permit conditions,immediately shut down the system and notify the project manager who must contact the SJVUPCD at(209) 557-6400 within 2 hours of detection. 2.4 Initial Start-Up Procedures for AS The AS will consist of mechanical equipment that has been specified to meet performance requirements for the site. Manufacturers' literature is in Appendix A. Color photographs of the AS will be inserted in Appendix D when available. Startup of the air injection blower consists of pushing the start button on the motor controller. Proper flow orientation should be verified upon initial blower startup. The air flow rate can be determined based on the maximum rated capacity of the air compressor. �•. 2.5 PMP Site Inspection for AS The AS will be operated 24 hours per day. PMP site inspections should be performed approximately bi-weekly to check the system for proper operation. The field inspection form that will be completed during each visit is included as Appendix E. AS maintenance includes: (1) periodic cleaning or replacement of the inlet particulate filter, (2) draining of condensate accumulation in receiver tank, (3) checking and tightening belt tension, (4) changing the coolant every 8000 hours or two years, and (5) replacement of system gauges or other equipment components as necessary. Parameters to be recorded during site inspections include the operational status of the compressor, compressor discharge pressure, and sparge injection point pressures. Concentrations of D. O. in air injection points and groundwater monitoring wells should be measured quarterly to evaluate whether D. O. in groundwater is increasing with AS operations. It is recommended that a baseline round of D. O. measurements be obtaining prior to starting AS at the site. D. O. concentrations can be measured using a down hole D. O. meter. Care should be taken to minimize water turbulence during measurement collection. In addition, a soil gas survey should be completed on a semi-annual basis to monitor 02, CO2, and hydrocarbon concentrations over time. The SVETS and AS must be shut down prior to performing the soil gas survey. Soil gas can be extracted from existing groundwater monitoring wells using a vacuum pump provided the well screen interval is not submerged below the water table. Each well should be purged until 02 and CO2 concentrations are stable to obtain a representative sample prior to conducting field measurements (approximately 10 minute purge time per well). Soil gas monitoring can assist in evaluating AS performance and the progress of soil remediation. Some D:\PNIP\Stockton Yard PMP.doc