Camino Penstock Stabilization Grouting Project Pollock Pines, California Back to Project List Post-Tensioned Rock & Soil Anchors Drilling Grout holes are drilled and 24-strand anchors are installed along the steep 35° to 55° slope. Project Overview: Layne GeoConstruction contracted with Sacramento Municipal Utilities District (SMUD), to provide slope stabilization of Camino Penstock, which had experienced small downhill movements since construction was completed in 1963. SMUD performed extensive monitoring of the penstock and on occasion adjusted the penstock to allow for the downhill movements. Measures implemented to improve the stability of the penstock foundation and anchor blocks, included stabilization of the toppling rock mass by grouting the rock to develop a gravity structure; installation of stitch anchors within the gravity structure; and the installation of deep anchors. The long term project involved mass grouting the rock slope to create a gravity structure 40 feet wide by 500 feet long. A total of 44, 90 feet long, 24-strand tendons were installed and tensioned to anchor the newly established gravity structure, to the more stable, underlying rock formations. The penstock work was performed along a steep slope inclination ranging from 35 to 55 degrees.     Value of Work Performed: $8,000,000 Project Duration: 4 months Project Completion Date: February 2001 Project Reference: Project Owner Sacramento Municipal Utilities District