Habitat and Park Design
An intensive program of invasive removal will take place throughout KMHRP. Invasive species like Ludwigia will be removed, while the Southern Tarplant and the Coastal Sage Scrub will be enhanced to satisfy habitat enhancement opportunities. Construction of park improvements including smart irrigation, new trails, and site amenities, such as fishing piers, are also recommended. Lake edge treatments, or planted bioinfiltration areas, will be constructed. These buffers will be designed and constructed to encourage pedestrians to utilize the park trails and designated access points to walk to the lake shoreline and to intercept irrigation runoff before it enters the lake. Schematics of the lake edge treatment concepts are shown at right.

BMPs
BMPs were evaluated for each of the major storm drain outfalls to remove trash and sediment from runoff before discharging to Machado Lake or the Freshwater Marsh. BMPs include Continuous Deflection Separation (CDS®) units at storm drain D24010 and at the Figueroa Drain; a Gross Solid Removal Device (GSRD) at Project 77; a bioengineered vegetative swale for dry weather treatment at Project 77; and a bioengineered vegetative swale at Project 510 Line C. The golf course maintenance yard will contain site BMPs.

Lake Options
The full suite of lake rehabilitation options will be implemented in the recommended alternative. This includes lake dredging and lake augmentation with supplemental water. Recycled water from the Terminal Island Water Reclamation Plant will be used for lake augmentation, while potable water will be used as a backup supply. Both these measures are needed to achieve and maintain a lake depth of approximately 8 feet, which is important in order to minimize internal nutrient loading. Dredging the lake will also remove sediment that is currently overenriched with nutrients and contributes to the internal nutrient loading problem. An offline-treatment wetland, an aeration system, and alum injection (as necessary) will also help satisfy the water quality objectives by removing nutrients from the water and increasing dissolved oxygen. In-lake sediment basins will be constructed in the northern portion of the lake just south of the riparian forest and near the Project 77 storm drain outfall to promote localized sediment deposition. The dam at the southern end of the lake will also be modified so that the lake level can be adjusted as desired. A final decision with regard to floating versus terrestrial islands will be made during the design phase.

Wetlands
In addition to the offline treatment wetland adjacent to the lake, wetlands improvements will be made in both the riparian woodland and lower freshwater marsh. Riparian woodland improvements include a runoff capture area and secondary flow channel. In the lower freshwater marsh, various methods will be used to increase flow dispersal, including a series of swales and berms at Storm Drain D7223. In addition, three acres of new emergent wetlands will be created.