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T MONITORING AND REPORTING PROGRAM NO. 96-816 - 2 - POST-CLOSURE 2 - POST-CLOSURE MAINTENANCE AND MONITORING UNOCAL CORPORATION AND AGRIUM, INC. SAN JOAQUIN COUNTY COVER AND DRAINAGE CONTROL FACILITIES MAINTENANCE AND MONITORING Annually, prior to the anticipated rainy season, but no later than 15 September, the cover systems shall be inspected for damage to the slopes, surface seal coat, and asphaltic concrete pavement. Any drainage control system (i.e., french drain, collection sumps, etc.) shall be inspected for damaged sections, debris, vegetation, and other conditions which could be detrimental to the system's operation. The cover slopes shall be inspected for erosion, settlement, or subsidence, and burrowing activities from rodents or other small animals or other conditions which may necessitate replacement of disturbed asphalt. In addition, the Discharger shall estimate the remaining life of the asphaltic concrete cover. The caps were designed for an approximate ten year life-span; therefore, the 30 October 2006 report shall also contain plans and a timeline for re-capping the former evaporation ponds. This requirement may be waived by the Executive Officer if it is shown that the waste management units no longer have the potential to impact water quality. Any necessary repairs or routine maintenance to the cover, cover slope, and drainage control system shall be completed by 15 October of each year, unless an extension is granted by the Executive Officer. Routine maintenance should consist of, at a minimum, annual crack sealing and seal coating every five years (or more frequently if visual inspection dictates the need). PERMANENT SURVEY MONUMENT MONITORING Every ten years, the Discharger shall survey the location of the permanent survey monuments. The results of the fust re-survey shall be included in the 30 October 2006 report. The surveys shall be compared to previous surveys and the results submitted to the Board. REPORTING In reporting the monitoring data, the Discharger shall arrange the data in tabular form so that the date, constituents, concentrations, and units are readily discernable. 1. Quarterly reports shall be submitted to the Board by the 30th day of January, April, July, and October. Each quarterly report shall include the depth to groundwater data and a groundwater contour map. 2. Semiannual reports shall be submitted to the Board by the 30th day of April and. October, and may be combined with the quarterly report. The semiannual reports shall include a description of the semiannual sampling event, a ground water contour map, laboratory analytical result sheets, and in tabular form, water quality data and depth to ground water.