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Permit M77-424 Amendment 1 Exhibit D <br />Page 5 of 6 <br />• Vegetation Control <br />• Drainage Control <br />• Road Repair <br />Pond inspections are conducted quarterly, Maintenance is conducted as needed with <br />the exception of vegetation control which is conducted annually. <br />Pipeline Monitoring and Maintenance <br />Pipeline monitoring and inspections consists of monitoring of flows and inspections <br />of sump sediment conditions at the Upper and Lower Manholes. These <br />measurements and inspections are conducted quarterly. To date, there has not been a <br />significant difference in flow measurements at the two manholes. Sump sediment <br />was pumped from the two manhole sumps during the summer of 2006. In addition, <br />the v-notch section of the sump was replaced in the Upper Manhole. Future <br />maintenance may include replacement of both sump detention walls. <br />Occidental has installed pipeline location signs adjacent to the water transmission <br />pipeline. When contacted by road maintenance contractors or other contractors <br />conducting excavation work in the area, Occidental will monitor work conducted on <br />Logan Wash road near manholes or in the azea of the pipeline to assure that manhole <br />covers and the pipeline are not disturbed or damaged. <br />Monitoring Retort Water Quality <br />A monitoring program to monitor retort water quality will be implemented in 2006. <br />This objective of this program is to assess retort water quality with time. A <br />significant improvement in retort water quality may allow for other water treatment <br />alternatives, such as discharge through the Colorado National Pollution Discharge <br />Elimination System (NPDES). Water quality sampling will be conducted on an <br />annual basis during late September at the Lower Bench Vault. If the Lower Bench is <br />not accessible, sampling will be conducted at the Upper Manhole (former Heater <br />Treater area). <br />Analysis of retort water will be conducted for the following screening parameters: <br />Boron Phenols <br />BTEX Sulfate <br />Chloride Total Alkalinity <br />Fluoride Total Dissolved Solids <br />Oil and Grease Total Petroleum Hydrocarbons <br />These parameters have been selected because of they aze commonly dissolved <br />constituents associated with oil shale retorting or are parameters of concern with <br />regard to NPDES discharge. The field pazameters of pH, specific conductivity, <br />