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(04) Lysimeters.The sampling and contingency action protocols for liner leaks <br />shall be as outlined in the Phase IV Water Quality Monitoring Work Plan, <br />revision #3 dated February 2003 as updated/revised. <br />(05)Modification. The testing programs specified in this Section 12may be <br />modified by City staff if City staff reasonably determines there exists a need for <br />additional wells to be tested or additional parameters to be analyzed, based upon <br />water or air quality test results indicating the presence of contamination. <br />(06)Split Samples. The Licensee shall notify the City forty-eight (48) hours <br />before samplingof groundwater or surface water and allow the City at its expense <br />to obtain split samples of such waters. <br />13.)Hydrogeologic Investigation. The investigation of the hydrological and <br />geophysical characteristics of the site shall be continued and any other new <br />information relating to the hydrogeologic impact of the site shall be reported to <br />the City. Hydrogeologic reportsshall be updated, amended, and modified as <br />warranted by newly discovered or additional data acquired in the continued <br />hydrogeologic investigation. Licensee shall notify City at least two (2) days in <br />advance of any soil boring or well construction requiredby this License. <br />Future site investigation and monitoringmust be conducted inthe vicinity <br />of P334L and other areas, southwestof the waste fill limitsto determine the scope <br />of off-site contamination. This work must focuson evaluating the deeper <br />outwashas the observed predominant pathway for contamination migration in the <br />downgradient area of the Site. <br />14.)Groundwater Corrective Actions. The "Groundwater Corrective Action <br />Work Plan", March 2021(Work Plan) outlines procedures for replacement of <br />residential wells due to impacts from contaminated groundwater downgradient of <br />the landfill. The licensee shall conduct the replacement of four residential wells, <br />as proposed. The licensee will replace additional residentialwells based on <br />evaluation criteria established in the Work Plan. The Licensee will provide the <br />City with periodic updates on the progress of well replacement identified in the <br />Work Plan. <br />Monitored Natural Attenuation (MNA) has been selected by the Licensee <br />as a groundwater corrective action. The success of MNA is determined by an <br />extensive groundwater monitoring program and the evaluation of data trendsand <br />the"stability" of thecontaminantplume. The Licensee shall evaluated trends for <br />ethyl ether tothe annual water quality assessment. <br />If evaluation of MNAdemonstrates that natural attenuation is not <br />protective of groundwater resources, the Licensee will provide a timely schedule <br />for implementing supplemental groundwater corrective actions described in the <br />"Corrective Actions Evaluation Report", August 2020. <br />17 <br /> <br />