Greeley 7th Ave Storm Sewer

The 7th Ave. Storm Project was designed and constructed using the CMAR model and included the reconstruction of 4 city blocks in downtown Greeley, CO including 12" waterline 8" & 12" sanitary sewer, 43"x68" HERCP storm sewer, storm sewer water quality structures, curb and gutter, sidewalk, earthwork, and asphalt pavement. J-2 Contracting was contracted as the CMAR at the 30% design phase. Through extensive value engineering efforts we were able to redesign the gas mains/services to run parallel gas mains on each side of 7th Ave. which saved over $100,000.00 in construction costs given that gas services did not need to be lowered under the new storm sewer.

Construction challenges included installation of all wet utilities through 4 blocks in downtown Greeley while maintaining services and access to all residences and businesses. Extensive public outreach we completed by J-2 to inform the local residents and businesses of upcoming construction activities. This included delivering bilingual fliers to all addresses prior to construction activities that would impact their daily travels and/or water/sewer services.

Storm flows were redirected daily as the new storm sewer progressed to ensure localized flooding would not occur. Care was taken to prevent damage to sanitary sewer services on the old sanitary sewer main as the new sanitary sewer main was installed. After the new sanitary sewer main was installed, the sanitary services were cut over to minimize service outages. Water services were installed temporarily using HDPE pipe located on the surface while the old water main was abandoned and the new water main was installed. A high degree of daily coordination was required between J-2, the City of Greeley, and all residents/businesses. This project was completed on time and under budget while minimizing the impacts to the surrounding businesses and residents.