Soapstone Sewer Rehabilitation Alternative Concepts Design and Associated Impacts
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1 Soapstone Sewer Rehabilitation Alternative Concepts Design and Associated Impacts
2 Outline Update on Soapstone Emergency Response Provide project background Provide project purpose & need Present proposed design concepts Present environmental impacts 2 of 44
3 Positive dye test near storm outfall 3 of 44
4 Dye test locations and results 4 of 44
5 Stormshed Delineation Example (F-117) Davenport Albemarle 43rd Van Ness 5 of 44
6 Outline Update on Soapstone Emergency Response Provide project background Provide project purpose & need Present proposed design concepts Present environmental impacts 6 of 44
7 Project Pipes= approx. 6,200 LF In service since (>100 yrs old) Condition Assessment results (completed 2010): Multiple internal structural defects Exposure of assets in stream due to erosion Risk of leaks & infiltration due to pipe condition and exposures 2 MS4 outfalls in need of repair Project Background and Overview 7 of 44
8 Project Area 8 of 44
9 Scope of Project Repair, Replace or Rehabilitate 6200 LF of sanitary pipe Repair or Rehabilitate 22 sanitary manholes Repair 2 storm outfalls per MS4 permit Eliminate exposure of assets to the extent practicable Maintain the function of National Park land 9 of 44
10 Sewers in Soapstone Valley 1 2 Outfall F Outfall F ~6200 LF of Pipe Rehab 10 of 44
11 Recent History DC Water Submitted Draft EA in 2012 One Action Alternative (CIPP) was presented at the time Impact to trees per earlier design was estimated by NPS as: individual trees NPS requested DC Water provide additional design alternative to reroute sewer flow outside Park property. 11 of 44
12 Current Status Per NPS request, DC Water has prepared: A second Concept Alternative - Reroute Sewer Flow out of the Park (i.e. Reroute Concept) Refined CIPP design (i.e. Trenchless Concept) and associated impacts Quantified Impacts to Trees for both concepts 12 of 44
13 Outline Update on Soapstone Emergency Response Provide project background Provide project purpose & need Present proposed design concepts Present environmental impacts 13 of 44
14 Reroute Concept Concept Objective Methodology Reroute Concept Summary Reroute Concept: Removal of sewage from NPS property by rerouting flow Remove sewage flow from NPS property Intercept sewage from locations where flows enter Soapstone Valley Park and re-direct it around the perimeter of the Park by installing a combination of new gravity mains, force mains and new pump stations. Protect assets within stream from erosion effects. Repair defective stormwater outfalls and manholes. Abandonment of inactive sewers and manholes. Rehab remaining non-rerouted segments via trenchless methods. 14 of 44
15 Sewers in Soapstone Valley ~6200 LF of Pipe Rehab 15 of 44
16 Reroute Methodology 1 3,280 LF of new gravity pipe installed = 527 LF of sewage removed from NPS 2 Pump Station No.1 & Open Cut Force Main Trenchless Gravity Sewer Pump Station No.2 & Open Cut Gravity Main 3 Open Cut Force Main 100 LF of Force Main installed = 1,138 LF of sewage removed from NPS 1,200 LF of Force Main installed = 1,154 LF of sewage removed from NPS 16 of 44
17 Pump Station #1 NPS Boundary 17 of 44
18 Pump Station #2 NPS Boundary 18 of 44
19 Pump Station Example 19 of 44
20 Access Paths & Construction Impacts NPS Boundary Access Path Needed 20 of 44
21 MS4 Outfall F117 F-117 and nearby slope F-117 large fracture 21 of 44
22 Access Paths & Construction Impacts Asset Protection Areas Access Path Needed NPS Boundary 22 of 44
23 Exposed Assets - examples Exposed Pipe and Manholes 23 of 44
24 Outline Update on Soapstone Emergency Response Provide project background Provide project purpose & need Present proposed design concepts Present environmental impacts 24 of 44
25 Reroute Concept Tree Impacts Impacts to Trees* on all Property Types (NPS, DDOT, and other) Trees Removed Trees Trimmed Total Reroute Concept * Reforestation/Re-growth of impacted trees is possible except for Pump Station locations & Permanent Access Road to P.S. #1 Impacts to Trees* NPS Property Trees Removed Trees Trimmed Total Reroute Concept * Reforestation/Re-growth of impacted trees is possible except for Pump Station locations & Permanent Access Road to P.S. #1 25 of 44
26 Pump Stations related impacts: Approx. 0.5 acres permanently impacted for 2 pump stations (combined) Acquisition of property (transfer of jurisdiction) from NPS and Private Owner (condominium) Noise and exhaust from emergency generators Increased presence of DC Water maintenance crew Reroute Concept Other Permanent road & crossing required Impacts 26 of 44
27 Reroute Concept Other Permanent road related impacts: Impacts continued Approx acres required Stream crossing (ex: concrete ford) required Permanent removal of existing vegetation and significant grading required 27 of 44
28 CIPP Concept Concept Objective Methodology CIPP Concept Summary CIPP Concept: Trenchless rehabilitation of infrastructure within NPS property Use trenchless technology to repair defective infrastructure Use Cured-In-Place Pipe (CIPP) or similar lining to provide structural rehabilitation of defective pipe segments. CIPP lining would require temporary access paths and staging areas to be used for lining equipment and setup vehicles. Protect assets within stream from erosion effects. Repair defective stormwater outfalls and manholes. 23 of 44
29 CIPP Methodology CIPP Lining Under Two At locations types Trenchless of where mulch Alt. access paths most would paths access be cross paths used: streams, would Heavy use temporary Equipment 16ft wide stream (HE) mulch matting path and crossings Light Equipment (bridges) would (LE) matting be used 29 of 44
30 Access Path - example Light Equipment Mulch Mat 30 of 44
31 Access Path - example Heavy Equipment Mulch Mat 31 of 44
32 Access Paths & Construction Impacts Asset Protection Areas Access Path Needed NPS Boundary 32 of 44
33 Access Paths & Construction Impacts Asset Protection Areas Access Path Needed NPS Boundary 33 of 44
34 Access Paths and Construction Impacts Asset Protection Areas Access Path Needed NPS Boundary 34 of 44
35 Access Paths & Construction Impacts Asset Protection Areas Access Path Needed NPS Boundary 35 of 44
36 Exposed Assets - examples Exposed Pipe 36 of 44
37 Asset Protection - example After Before 37 of 44
38 CIPP Concept Tree Impacts Impacts to Trees* on all Property Types (NPS, DDOT, and other) Trees Removed Trees Trimmed Total CIPP Concept * Reforestation/Re-growth of impacted trees is for all areas Impacts to Trees* NPS Property Trees Removed Trees Trimmed Total CIPP Concept * Reforestation/Re-growth of impacted trees is possible for all areas 38 of 44
39 CIPP Concept Other Greater disturbed area in the short-term Impacts 39 of 44
40 Summary of Tree Impacts All Property Types Combined (NPS, DDOT & Other) 2012 CIPP Concept Impacts 2015 Reroute Concept Impacts CIPP Concept Impacts NPS Property Not Available of 44
41 Impact Comparison Alternative Concept Type Reroute Concept CIPP Concept Temporary Impacts Large equipment presence for excavation and movement of heavy structures Construction access via Audubon Terrace Greater short-term disturbance pre-mitigation Permanent Impacts Permanent access road from foot of P.S #1 in Park all the way to Audubon Terr. Significant re-grading of area within Park and around P.S #2 Acquisition of temporary and permanent easements from NPS and private owners Regularly scheduled maintenance of pump stations Increase in energy consumption and carbon footprint Noise issues due to emergency generators 4,380 LF of sanitary pipe would be abandoned-in-place Tree Impacts 449 (All types) Tree Impacts 379 (All types)
42 Options Pro s and Con s Alternative Concept Type Reroute Concept PRO S No flow in west half of NPS property CON S More permanent impacts More linear feet of pipe installed More trees impacted CIPP Concept No permanent impact Fewer trees impacted Must work in National Park Service (NPS) land 42 of 44
43 Next Steps Complete Draft EA for NPS review Sept /- Complete Draft EA for agency review Nov /- Complete Draft EA for public review Jan /- 43 of 44
44 Questions 44 of 44
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