Streambed Alteration Agreement (1600-2005-0317-R5) Regarding the Line 2001 Pipeline Exposure Repair Project

Streambed Alteration Agreement (1600-2005-0317-R5) Regarding the Line 2001 Pipeline Exposure Repair Project

The Operator proposes to alter the streambed and banks by re-contouring the existing exposed pipeline. The exposed section on Line 2001 is approximately 12 feet long within the lower bank and channel bottom of the 30-foot wide drainage channel. The exposure repair will require a backhoe to scrape away the soil on each side of the pipe to allow inspection for additional damage to the pipe wrap. Once the pipeline wrap has been examined, repair will be made prior to covering the pipe. Native soil and sand bags will be used as a protective cover over the pipe. Un-cemented rock rip-rap will be placed over the pipe along the southern creek bank. The rip-rap armament would extend approximately 30 feet upstream from the exposure to prevent future erosion over the pipeline. Access to the project site is through the existing dirt road from East Walnut Drive directly adjacent to the unnamed ephemeral drainage channel. The proposed actions are anticipated to occur in late summer to early fall when little or no flow exists in the stream channel. If water is present during construction, a temporary sand bag berm will be constructed during the 2-3 day construction period to minimize potential impacts to water resources and native riparian vegetation in the area, such as the project biologist will assist the construction crew in identifying appropriate access to the exposure area that will avoid impacts to riparian vegetation. No vegetation will be removed from the project site during repair. SAA # 1600-2004-0317-R5

Diamond Bar

Los Angeles