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r <br /> The natural iron in groundwater was evaluated because of its potential <br /> deleterious effect on air sparging and soil venting Ferrous iron was not <br /> detected at or above the laboratory detection limit of 0 05 milligrams per liter <br /> in any of the groundwater samples <br /> 5.1 Monitoring Procedures <br /> rSecondary remedial actions will include semi-annual groundwater <br /> monitoring for BTEX components by USEPA Method 8020, for TPH by <br /> ' USEPA Modified-method 8015 and for MTBE/oxygenates by USEPA <br /> Method 8260 Samples will be collected with a disposable polyethylene <br /> bailer pre-cleaned at the factory Semi-annual reports will be submitted to <br /> the County which summarize the analytical results and discuss data trends <br /> 5.2 Closure Criteria <br /> Closure will be requested following two consecutive groundwater monitoring <br /> events in which no benzene concentrations in groundwater are assured to <br /> exceed 100 gg/l Closure will not be requested unless historical data trends <br /> indicate decreasing plume size and unless a review of potential exposure <br /> pathways indicates no significant potential risks to human health <br /> r <br /> r <br /> r <br /> r <br /> r <br /> r <br /> r <br /> Remedial Action Work Plan <br /> Prepared for TtfE EARTHGRA[NS COMPANY 18 Prepared by Philip Services Corp <br /> ii\ENV1624001451RAP61300 doe 6131/00 <br />