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f- t %001 %Vol <br /> It is anticipated that the stockpile of clean overburden soil can be used to help backfill the <br /> excavation. The stockpile of impacted soil can probably be profiled as non-hazardous waste and <br /> transported under a non-hazardous waste manifest to a Class II landfill or to a thermal or biological <br /> treatment facility for disposal and/or destruction. <br /> 2.4 Site Investigation and Source Removal Report <br /> A project report documenting all of the proposed work activities will be prepared and stamped by a <br /> state of California Registered Geologist and submitted to PHS/EHD and the Central Valley <br /> Regional Water Quality Control Board (RWQCB). In addition to a standard discussion of methods, <br /> the report will include the following: <br /> • Tables summarizing laboratory results; <br /> • Site location map and site plan; �l; t <br /> • Figure(s) depicting the extent of impacted soil and groundwater; — A .I ll� <br /> • Map describing the final excavation limits and sample locations; <br /> • Soil boring logs and laboratory reports (Appendices) <br /> • Recommendations for future environmental corrective actions, if necessary. <br /> 2.5 Quarterly Groundwater Monitoring, Sampling, Analysis and Reporting <br /> To monitor groundwater flow and gradient characteristics and evaluate the effectiveness of the <br /> source removal activity, the three existing monitoring wells will be monitored and sampled on a <br /> quarterly basis for a period of at least one year. <br /> During each of the monitoring and sampling events, depth-to-groundwater and free product <br /> thickness (if necessary)will be monitored in each well using a water level indicator or an Interface <br /> ProbeT" capable of measurements to within 0.01 foot. <br /> Following liquid level measurement, each of the wells will be purged and sampled. The wells will <br /> be purged with decontaminated PVC bailers or downhole pumps until at least three well casing <br /> volumes have been extracted and after groundwater temperature, pH and electrical conductivity <br /> values have stabilized. Groundwater will be sampled from the wells using dedicated and <br /> disposable bailers and laboratory-supplied containers. Each sample container will be labeled, <br /> packaged in an iced cooler and transported for analysis under chain-of-custody manifest to a state <br /> of California certified hazardous waste testing laboratory. <br /> 9 <br />