3800 RIVERFRONT BLVD 2025-07-23 - Laserfiche WebLink

1 The City of Everett The Flovd & Snider Team Everett Landfill/Tire Fire Site 3.6.2 FREQUENCY OF SAMPLING Confirmation sampling at each discharge vent pipe would be done one time after the operating system had reached stable operating conditions. This would be no sooner than 30 days after system start-up and no later than 90 days after system start-up. 3.6.3 EVALUATION METHODS The purpose of the sampling is to determine if the assumptions for pollutant concentration and landfill gas flow used in the design modeling were equal to or less than the actual conditions. Therefore, pollutant concentrations would be compared to the concentrations listed in Table 1. Landfill gas flow would be compared to the value modeled at that vent. If all pollutants found in the samples are less than or equal to the concentration of the pollutants in Table 1 and the measured landfill gas flow is less than or equal to that modeled, then the model assumption would be correct and no further action would be required. If any measured pollutant concentration exceeds its value in Table 1 or the measured landfill gas flow rate exceeds its modeled value, then the contingency measures would be initiated. 3.6.4 REPORTING REQUIREMENTS Results from the sampling event would be reported to PSCAA and Ecology. The report would include a determination as to whether any further action was required or not. If further action were required, the report would include a description of the intent of further analysis and design and a schedule for completion. Further analysis and design would be as discussed in the contingency plan presented below. The results of the contingency plan analysis and design would also be reported at completion. 3.6.5 CONTINGENCY PLAN The contingency plan would be executed if it were determined that the model assumptions were exceeded in the measured results. In that case, the expected ambient concentrations would be recalculated based on the measured results. If modeling demonstrates that cleanup levels and ASIL standards are still not exceeded in ambient air, then no further action is required. If modeling demonstrates that there is a potential exceedance, then modifications to the discharge will be designed to correct the condition. The revised design would be modeled using the measured data to demonstrate compliance with MTCA cleanup levels and ASIL standards. If the proposed correction includes a treatment system, that system would be permitted in accordance with PSCAA regulations. Monitoring P an\CM Everett LanOO.dfi111PDF maker -final dots\Compliance Compliance Monitoring and Contingency Plan Monitoring PIan1CMCP 1 1-10-OO.doc FINAL - March 2001 Page 3-12 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1