25C - AGMT - OCWD CENTENNIAL PARK

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Section 3 Repaving of Centennial Park Parking Lot Once the construction activities are completed, the parking areas and roadways at Centennial Park would be repaved. As shown in Figure 5 a total of 9.64 acres of area would be repaved. The paving activity would include the grinding and removal of two inches of existing asphalt, replacing the depth with new asphalt, and restoring the parking and roadway painting and markings. The repaving of the parking lot would not result in the loss of any existing parking spaces. Prior to the start of paving OCWD would coordinate with Santa Ana College Centennial Education Center on the appropriate time of the year to repave the parking lot. Construction of Monitoring Well A bellow ground monitoring well would be constructed within an existing dirt parking area at the Heritage Museum site. The monitoring well would be housed in an underground vault with a 2' x 3' metal cover and 6'x 7' concrete apron. The concrete apron WOUd be incorporated into the existing parking area. The monitoring well! would operate 24 hours per day monitoring water levels and water quality. However, unlike injection wells the monitoring well would sit idle, until the time it is sampled or maintained. As shown in Figure 6 a 5,000 square foot area would be needed to construct, operate and maintain the monitoring well). The proposed well would be a nested monitoring well and Would be drilled by direct mud rotary drilling equipment and would occur 24 hours a day over a two week period and 12 hours day over another two week period. After the well construction is completed the existing dirt parking lot would be resurfaced with decomposed granite. Additionally, as part of site improvements at Heritage Museum, an existing irrigation system to the demonstrate garden would be replaced and interpretive education kiosks would be installed. The long term operation of the monitoring well would include water level monitoring and water quality sampling. The monitoring activities would occur during the day generally on a monthly to quarterly basis. 3,.4 Long Term Maintenance Injection Wells The injection wells are routinely redeveloped every two to five years to remove accumulated sediments and microbiological build-up within the well casings to restore the well capacity to operate at their maximum injection capacity. As part of the redevelopment the injection well would be back washed. The discharging of the well water associated with redevelopment activities would be conducted in accordance with NPDES Permit requirements. Typical injection well redevelopment activities would involve field equipment such as outrigger crane, Mid Basin Centennial Park I 1 Project Final EIR 3-9 9U -9