No significant changes in absorption rates or drainage patterns are anticipated as a result of the proposed facilities. The proposed project would only slightly increase the volume and velocity of runoff at the Fulton and Geysers sites. The project would include minor grading and would slightly increase the impervious surface. Approximately 130-square-foot concrete pads for two new circuit breakers and footings for new 115 kV bay structures inside the Eagle Rock Substation and two new gravel access roads would be created at the Geysers site with a combined area of 5,700 square feet. The combined area that would be disturbed at the Geysers site is 5,830 square feet, which would be less than 0.01 percent of the total area of the relatively undeveloped drainage sub-basin in which this portion of the project is located. The surface treatments proposed for the project would not significantly increase the discharge of surface water runoff generated within the drainage basin during the runoff events.
Drainage along the 115kV power line at the Geysers site flows down a moderately steep slope. No drainage channels were observed along the alignment of the power line. However, there are swales oriented perpendicular to the slopes in which runoff is concentrated during rainstorms. The proposed project is not anticipated to alter the flow patterns within the swales. The proposed access roads would be graded to maintain existing sheet flow drainage patterns. Because the proposed project is not anticipated to alter the slope of the project, the velocity of runoff is expected to remain the same.
No significant runoff is anticipated as a result of the proposed project at the Fulton site. A 36 square foot concrete pad is proposed for the new 115 kV circuit breaker. The construction of this pad would not result in significant changes in runoff discharge or velocity. The nominal amounts of additional surface runoff are not anticipated to affect the operation of existing Spill Prevention Containment and Countermeasures ponds at the Fulton and Eagle Rock Substations.
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