The Operator proposes to alter the stream to clean and maintain approximately 11,381 linear feet (2.16 miles) of existing 15-inch, 27-inch, and 30-inch vitrified clay pipe, 8-inch, 10-inch, 24-inch, and 27-inch polyvinyl chloride pipe, 24-inch and 30-inch ductile iron pipe from existing manholes, and a section of 60-inch pipe of unknown material, that make up a portion of the Penasquitos Canyon Trunk Sewer and its associated tributary lateral lines. Work will be accomplished using an all surface vehicle (ASV) and trailer mounted bucketing equipment as to the extent possible, along with the City utility trucks where necessary and where access permits. Larer, heavy construction equipment could be needed to grade access routes in some locations because of steep, rocky conditions that are beyond the capabilities of ASVs. Work is to be accomplished only at existing manholes. Equipment access into the canyon is anticipated to be obtained at up to six separate access points: via the stables on Black Mountain Road, a gate on Mercy Road where the County Water Authority Pipeline crosses the creek, from the Penasquitos Pump Station, down a ramp from the bike trail off Poway Road, and from a gate and dirt road off Sabre Springs Parkway. A portion of the access will be provided by driving on existing dirt roads and trails. Access to one section of manholes west of I-5 will be provided by widening an exsting hiking trail and bridges known as Penasquitos Canyon Preserve Trans County Trail Connector. Many of the manholes east of I-5 are located within the creek itself, away from existing roads and trails and with adjacent upland habitat steep and rocky, necessitating wetland impacts. Native riparian habitats found on the site include: southern cotton-willow riparian woodland, southern willow scrub, southern coast live oak riparian forest, mulefat scrub, coastal and valley freshwater marsh, and open channel. The entire canyon is located in the Multi-habitat Planning Area of the City of San Diego Multiple Species Conservation Program.