POTHOLE TESTING

POTHOLE TESTING

As a result of the proposed Southbound SR-133 Connector to Northbound I-405 Widening Project (EA 0N890), The Irvine Ranch Water District (IRWD) proposes to perform pothole testing (approximately 5 potholes or excavated trenches with dimensions of 4.5 ft long by 2 ft wide by 6 ft. deep) within the San Diego Creek bed to determine the relocation of their existing sewer facilities, in the City of Irvine, County of Orange. Work activities include, but are not limited to, entering through access gate off of Spectrum with the CAT Excavator, driving down paved bike trail to enter creek bottom via existing ramp on the north side within the temporary impact area limits, proceeding with excavator towards bridge location via existing path, using excavator to build temporary ramps and native soil material where boulders and/or changes in grade are too difficult for excavator to get through, removal of boulders using excavator, 5 pothole excavation with CAT excavator, backfilling of potholes locations with original excavation spoils/native, and proceeding to exist creek via temporary access ramps, removal of temporary access ramps and returning creekbed to original condition, exiting using existing bike trail access road. Equipment to be used includes 1 crew truck (only at spectrum cul de sac), 1 Foreman Pick Up Truck (only in spectrum cul de sac), 1 CAT 314 Excavator (in creek), 1 Dump Truck if required (only in Spectrum cul de sac), 1 Lowbed (only in spectrum cul de sac), approximately 1 foreman, 1 operator and 3 laborers. The proposed pothole project will result in total of 0.13 acres of temporary impacts to California Department of Fish and Wildlife (CDFW) unvegetated streambed and Army Corps of Engineers (ACOE) non-wetland waters of the U.S.; this is mainly due to temporary equipment access and potholing activities in the creek. The contractor will need approval of the access ramps. The purpose of the project is to determine whether the existing sewer line will need to be relocated, as result of the proposed future Caltrans Widening project Total Disturbed Soil Area (DSA) is less than 1 acre. The need is it is unknown if the existing sewer facility is currently in the way before construction of Caltrans widening project begins. The project does not have federal funding. A portion of the project is within Caltrans right of way.

Irvine

Orange

Southern California