Environmental
Environmental Site Assessment Phase I
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgfHUs7ZYdeaD5kcXohwbrDLOGE9jq9YbxAfYq_07TBFviBXJOZU1bfwA5CB-sqylznyjx2AFdRBCRlIpTQ2b8NktH-IPtxbzsL1a3zx3z6b9Pq2mFccCW4j5royPBXr29gY-7z0zQJZ1o/s1600/tree+p.png)
Sand Filter System
- Shall be in accordance with guidelines codes, regulations,policies, and permits required by the City of San Antonio:
- Unified Development code (UDC)
- Environmental Protection Agency (EPA)
- Texas Commission on Environmental Quality (TCEQ)
- San Antonio Water System Resource Protection and Compliance Department
- US Fish and Wildlife Service
- Texas Parks and Wildlife Department
- Other environmental related organizations
- Property designated for the project falls within the Edwards Aquifer Recharge Zone and Mandatory Detention Zone
- Water Pollution Abatement Plan
- Aquifer Protection Plan
Edwards Aquifer Recharge Zone in Bexar County Map
Tree Preservation
- Tree Delineation Alternative
- Final tree canopy required by the UDC: 25% of total tree canopy
- Final tree canopy preserved: 28%
- Total tree canopy removed: 72%
- Habitat Compliance form
- Karst zone 2
- Not in GCWES zone
- Tree Permit Application
Tree Preservation Plan
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgfHUs7ZYdeaD5kcXohwbrDLOGE9jq9YbxAfYq_07TBFviBXJOZU1bfwA5CB-sqylznyjx2AFdRBCRlIpTQ2b8NktH-IPtxbzsL1a3zx3z6b9Pq2mFccCW4j5royPBXr29gY-7z0zQJZ1o/s1600/tree+p.png)
- US Fish and Wildlife Service
- UTSA Karst Fauna Region
- Zone 2: Areas having a high probability of containing suitable habitat for invertebrate karst species
- Texas Parks and Wildlife department
- Not in the Golden-cheeked Warbler Endangered Species Habitat zone
Sand Filter System
- TCEQ Edwards Aquifer Rules: Technical Guidance on Best Management Practices
- Sand Filter System
- Two basins: Pretreatment/Sedimentation basin and Filtration basin
- Flow Diversion Structure evenly disperses inflow
- Filtered bed
- Underdrain pipe system
- Perforated riser between basins
- Overflow Spillway
- Basin Size
- Size based on WQV with added 20% to accommodate for sediment buildup
- Depth: 6ft
- Length-to-width ratio 2:1
- Perforated Pipe
- 1” diameter perforations spaced vertically at 2-½”
- Rip rap erosion protection
- Filtered bed:
- 3” top soil
- 18” sand
- 6” gravel and underdrain system
- 4” Schedule 40 PVC pipe
- ⅜” diameter perforations
- 1% slope
- Geotextile fabric encasing sand layer
- Grass cover aid in pollution adsorption
- Overflow Spillway
- 3:1 slope