The document discusses stormwater management and low impact development (LID) techniques. It describes CrystalStream Technologies' proprietary structural BMPs, which include gross pollutant separation to remove trash, nutrients, and fine pollutants through sequential filtration. It also discusses how LID aims to maintain pre-development hydrology through design techniques. While LID BMPs are effective, the document notes that proprietary systems can also integrate with LID to offer benefits like shorter cleaning cycles, reduced costs, and enhanced effectiveness when the right BMP is matched to the pollutants.

1. San Bernardino NPDES Co-Permitee Monthly Meeting Brent Helm CrystalStream Technologies Storm System Services

2. CrystalStream Technologies Post Construction Structural BMP’s Cleaning & Maintenance Services Life cycle Approach Site Specific Design Integrated Installation Cleaning & Maintenance Partnership with Stakeholders

3. CrystalStream Technologies Gross Pollutant Separation Trash Removal Nutrients Fine Pollutant Removal Sequential Filtration Easy Maintenance

4. Sustainable Low Impact Development (LID) Sustainability - of, relating to, or being a method of harvesting or using a resource so that the resource is not depleted or permanently damaged < sustainable techniques> < sustainable agriculture Low Impact Development - a design strategy with the goal of maintaining or replicating the pre-development hydrologic regime through the use of design techniques to create a functionally equivalent hydrologic site design.

5. Sustainable Low Impact Development (LID) LID Gaining Strength Increased Applications EPA Leadership Private & Public Research Effective removal Match Pre-existing Hydrologic Site Conditions Enhanced Green Space Bio-Retention, Constructed Wetland, Cisterns

6. Sustainable Low Impact Development (LID) Second Flush Pollutants Debate at scientific level on importance for environmental impacts Trash classification Sediment above 60 microns CST Data on captured amounts Real world issues of gross pollutant load Optimal Treatment flow – gravity based systems Mass of Pollutants – does not care Negative Impacts on fine pollutant removal Impact on Long-Term Sustainability Erodes effectiveness Increased Cost

7. Second Flush (1 Yr. Storm) 1 inch First Flush .5 Acre 100% Impervious 0.74 cfs Second Flush – 6 Month .5 Acre 100% Impervious 2.74 cfs

8. Sustainable Low Impact Development (LID) Integrate Proprietary System w/LID Many Benefits for LID Goals Typically not on LID menus of BMPs Negative view of underground structures Benefits vs. open forebay/no pretreatment Land Use or misuse Trash and Hydrocarbons LID Effectiveness Long Term Cost

9. Project Profile – Ga. Tech Pretreatment for Cistern Water re-use for irrigation Protect pump Reduce Maintenance Cost

10. Project Profile – Lake Lucerne Pretreatment for Underground Infiltration Upstream of Lake Limited Land Area Reduce Maintenance Cost

11. LID Sustainability Summary LID some of the Best BMPs in toolbox Match the BMPs to the Pollutants Proprietary Systems can be LID Shorten Cleaning Cycle Reduce Cost Enhance effectiveness Land use optimization Cleaning is forever……….