crosspointe pond retrofit 2014
DESCRIPTION
Crosspointe Pond Retrofit 2014TRANSCRIPT
A Fairfax County, VA, publication
Department of Public Works and Environmental Services
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CROSSPOINTE SEC. 15 PD 15A (#0775DP) PROJECT
Contract Number CN13316004Project Number SD-000017-002Task Order No. 22Springfield District
June 5, 2014
CROSSPOINTE SEC. 15 PD 15A (#0775DP) PROJECT
Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch
Project DetailsCROSSPOINTE SEC. 15 PD 15A (#0775DP) PROJECT
Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater Construction Branch
Description:
The Crosspointe Sec. 15 PD (#0775DP) project was substantially completed on August 23, 2014. This is an existing SWM facility and it is located adjacent to the intersection of Cross Chase Court and Cross Chase Circle in Fairfax Station. The project pond was retrofitted to provide improved water quality benefits and additional storage. The proposed water quality benefits realized by this project will be the removal of 10.99 lbs./year of total phosphorus, 2.41 lbs./year of total nitrogen and 472.58 lbs./year of total suspended solids.
Project Overview:• Re-graded the facility to lengthen the flow path and maximize the pond volume.• Excavated and constructed three micro-pools at a maximum depth of 18” below the pond bottom.• Extended class I riprap of the existing two inflow structures to the bottom of the micro pools. • Installed a rock weir structure in addition to minor grading to the stream channel that outfalls into
the existing pond. • Replaced the existing gravel trail and extended it to the location shown on the plan.•Restored the site with seed mix, trees will be planted at the end of Sept. 2014.
Project Team:• Stormwater and Planning Division – Charles Smith• Utilities Design and Construction Division - Yousef Rayyan• Utilities Design and Construction Division – Joseph Adzovie• Surveyor - Gregory Harper
CROSSPOINTE SEC. 15 PD 15A (#0775DP) PROJECT
Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater Construction Branch
Fairfax Station, VA, Tax Map #106-2
Project Site
Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater Construction Branch
CROSSPOINTE SEC. 15 PD 15A (#0775DP) PROJECT
PRE-EXISTING CONDITIONS
AN EXISTING RISER
CROSSPOINTE SEC. 15 PD 15A (#0775DP) PROJECT
POST CONSTRUCTION
MICRO-POOL NO.1
MICRO-POOL NO.2
MICRO-POOL NO.3
EXTENDING THE RIP-RAP TO THE BOTTOM OF THE MICR-POOL
Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater Construction Branch
Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater Construction Branch
CROSSPOINTE SEC. 15 PD 15A (#0775DP) PROJECT
PRE-EXISTING CONDITIONS
15” RCP INFLOWS FROM THE NORTH END OF THE POND
Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater Construction Branch
CROSSPOINTE SEC. 15 PD 15A (#0775DP) PROJECT
POST CONSTRUCTION15” RCP INFLOWS FROM THE NORTH END OF THE POND
MICRO-POOL NO.3
THE ACCESS ROAD
Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater Construction Branch
CROSSPOINTE SEC. 15 PD 15A (#0775DP) PROJECT
PRE-EXISTING CONDITIONS OF THE TRAIL
Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater Construction Branch
CROSSPOINTE SEC. 15 PD 15A (#0775DP) PROJECT
THE NEW TRAIL AFTER REPLACEMENT
CROSSPOINTE SEC. 15 PD 15A (#0775DP) PROJECT
ROCK WEIR STRUCTURE AND THE IMPROVEMNET OF THE EXISTING CHANNEL
A ROCK WEIR STRUCTURE AND MINOR GRADING WERE PROPOSED TO IMPROVE THE STREAM CHANNEL THAT OUTFALLS FROM THE WEST END INTO THE POND
Before After
CROSSPOINTE SEC. 15 PD 15A (#0775DP) PROJECT
Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater Construction Branch
Additional Information
For additional Information, please call
www.fairfaxcounty.gov/dpwes
Ben Boxer, Public Information Officer703-324-5880, TTY 711
Ben. Ben Boxer, Public Information Officer703-324-5880, TTY 711
Ben. Ben Boxer, Public Information Officer703-324-5880, TTY 711
Irene Haske, Public Information Officer703-324-5500, TTY [email protected]
Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater Construction Branch