All correspondence must be made through the Vendor Portal. Specifications include, but are not limited to: The Lower Turtle Pond Spillway Enhancement Project consists of grading and reshaping the existing pond earthen spillway, and the placement of geotextile fabric, Caltrans Class I Rock Slope Protection and 2’ boulders to form an armored spillway, as further detailed and described herein as the Contract Documents. In winter 2017, horizontal cracking was observed along the berm’s face. A geotechnical investigation in fall 2020 revealed high structural integrity of the berm. The superficial cracking was likely caused by expansive clays in the berm fill. The installation of additional crushed rock and fabrics could reduce erosion along the berm’s face, but modifications to stabilize the berm are unnecessary. Creating a designed spillway is necessary, however, because the shallow outlet through which Lower Turtle Pond currently spills exposes the berm to flooding and erosion. Lower Turtle Pond’s position in the tributary drainage of San Gregorio Creek, which is 303(d) listed for sediment impairment by the San Francisco Bay Regional Water Quality Control Board, approximately one-half mile to the southwest, indicates that berm or spillway failure could negatively impact stream water quality in addition to the direct loss of habitat for special status species and water supply for grazing. The spillway must be improved to avoid these impacts, future disturbances to the berm, and erosion. Project Location The project site is located within the La Honda Creek Open Space Preserve, located roughly 1 mile north of the Town of La Honda. The project site is easily accessible via Highway 84 and Sears Ranch Road, and is located roughly 2,000 feet west of the main preserve parking area.
