INTENT We believe that the proposed storm water management system design exceeds LEED\'s storm water goals and intent in both quantity and quality by 1) maintaining on-site infiltration and managing additional off-site storm water runoff, and 2) improving water quality by removing pollutants from on-site and off-site storm water runoff. Additional measures were taken to assure the storm water management system was designed to maximize treatment of storm water runoff from adjacent properties. DESIGN APPROACH The proposed new construction is located on 13.7 previously developed acres consisting mainly of hard-turf soccer fields, gravel parking, and a small abandoned building. Existing site best management practice\'s (BMP\'s) consist of one vegetated swale and there are no rate or volume control measures. Adjacent to the site, along the south and east borders, are 5.0 acres of residential development and county road that currently receive no treatment. The proposed 13.7 acre site and the adjacent off site 5.0 acres share a 48" culvert located in the southeast corner of the proposed site. The proposed on-site storm water management system consists of 4 infiltration/settlement basins, 2 vegetated swales and 1 detention pond. The system is designed to route water from the building roof and parking lots through pre-treatment infiltration basins located on the east and west ends of the parking lot. Water from the west end parking lot infiltration basin will outlet to a vegetated swale which will flow to the detention pond on the southern edge of the site. Water from the east end parking lot infiltration basin will outlet to another infiltration basin near the southeast corner of the museum, which then outlets to a vegetated swale before entering the detention pond on the southern edge of the site. The additional 5.0 off-site acres of storm water runoff will be rerouted to enter the site at the infiltration basin at the southeast corner of the site. As explained above, after treatment in this infiltration basin the runoff flows through a vegetated swale and in to the detention pond. All storm water will then pass through one additional infiltration basin before exiting the site. PROPOSED COMPLIANCE After the construction of the project and its site appurtenances are completed, the impervious areas of the site will consist of a 0.9 acre building footprint, 1.4 acre parking lot, and 1.2 acres of trails, patios, turfed surfaces, and sidewalks. The remaining 10.2 acres of the site will consist of various types of native and adaptive vegetation along with BMP\'s. The 5.0 off-site acres will be rerouted to be incorporated in the BMP\'s of the proposed site. The project team intentionally designed the storm water management system to maximize treatment of on-site storm water runoff and to handle 5.0 additional acres of runoff (approximately 35% additional area) from an off-site residential area and section of county road currently receiving zero treatment. Through hydraulics/hydrology models we have confirmed that the site will reduce peak discharge rates for the 1 and 2 year 24 hour storm events by 30%-15% respectively. The site will also reduce discharge volumes for the 1 and 2 year 24 hour storm events by 50% and 25% respectively. Through water quality models we have confirmed that the site will reduce the total suspended solids by 85% and total phosphorus by 60%. We are confident the combined interaction between the infiltration basins, swales and the detention pond assures that the project site exceed LEED goals and intent for both storm water quantity and quality. PROPOSED SUBMITTAL Site Plan Landscape Plan Hydrology Model Report As a result of our efforts, we believe that the design and implementation of the project\'s storm water management system and the treatment of 5.0 additional acres of off-site runoff should be granted 1 LEED ID point. Please confirm compliance.