Century developed railroad crossing safety improvements at the intersection of Terminal Avenue and the Norfolk Southern Railroad in New Castle County, DE. The proposed improvements consisted of track removal and replacement, installation of a precast concrete track box, intersection improvements with Christina Avenue, and drainage improvements. Our team also worked on sidewalks, pedestrian facilities, and curbs and gutters.
Since the proposed improvements resulted in a slight increase in impervious area, Century’s stormwater management approach followed the Standard Plan criteria in the Department of State Standardized Regulations (DSSR) for projects consisting of sidewalks, trails, or other linear impervious surfaces. As a result, Century verified that the limit of disturbance (LOD) within the project limits was less than one acre and delineated the pre and post-development drainage areas at each point of analysis (POA). Using DelDOT’s Standard Plan Curve Number (CN) worksheet, Century confirmed that the post-development CN was no more than one whole number greater than the pre-development CN. Since Terminal Avenue experiences frequent localized flooding, curb openings were installed based on spread width computations to alleviate these issues. Century also designed the erosion and sediment controls for the project to prevent sediment from entering the closed storm drain system or escaping the project limits behind the proposed sidewalk.
Century currently serves as proxy for the DelDOT stormwater engineer for all railroad crossing safety improvement projects that fall under Standard Plan criteria in the DSSR. As a result, Century followed their own internal QA/QC process by reviewing the construction plans and issuing comments to design staff for revisions. After the construction plans and Standard Plan computations were reviewed and all comments were addressed, Century was responsible for signing and sealing the plans for the stormwater engineer.
As the project was nearing completion, an unforeseen and unusual event occurred where leachate from a large stockpile of sugar stored along Terminal Avenue was draining onto the site. Century responded promptly by visiting the site with the stormwater engineer and quickly developed a series of solutions consisting of the installation of a 12” compost filter log along the fence line to keep the illicit discharge from entering the right-of-way and the placement of additional topsoil, seed, and mulch to promote re-vegetation of the areas destroyed by the contaminated runoff.
Delaware Department of Transportation (DelDOT)
New Castle County, DE
Delaware Department of Transportation (DelDOT)
New Castle County, DE
