After reviewing the three methodologies, it appeared that a vegetated swale constructed over an infiltration trench
, using the Presumptive Approach, would be the most appropriate for use on this project.
Included at the bottom of each infiltration trench
is an innovative plastic chamber from Infiltrator Systems, Incorporated, Saybrook, Connecticut designed to increase the void ratio in the trench, which reduces the amount of stone needed.
The project was comprised of five stormwater control measure (SCM) retrofit projects including two bio retention areas, an infiltration trench
and a wet detention pond with a sand filter.
Tenders are invited for construct a 4,825 sf parking lot with a storm-water infiltration trench
4 AC of clearing and grubbing; 1,612 LF sawcut; 1;024 LF of removal of curb; 180 SY of removal of sidewalk and asphalt pavement; 2,236 HMA CL 1/2" PG 64-22; 614 LF storm infiltration trench
pipe system; 100 LF of 6" DI storm sewer pipe; 246 LF of 8" schedule A storm sewer pipe; 5 EA of 48" manhole; 6 EA of 1 - cartridge concrete storm filter catch basin; 1 EA of relocate water meter; 682 LF type 3 chain link fence; 40 LF of 6" DI pipe for water main; 768 LF of 8" DI pipe for water main; 2 EA of connection to existing waterline; 723 LF of 8" PVC sewer pipe and bedding; 820 LF of trench excavation backfill and compaction less than 10 LF; see outside link.