Trumbull Park Homes Chicago, Illinois Prism Engineering Inc. experience included engineering services for the improvement of a Chicago Housing Authority (CHA) site on the far south side of Chicago. The 21 acre site consisted of Building rehabilition and complete reconstruction of the site including new parking areas, underground utilities, sidewalk and Access Drive. Storm water detention was introduced to the E N G I N E E R I N G I N C . site even though none was required before. Large pipes (60-inch dia.) and precast concrete modules (4'x6') were used to store rain water underground. Utility coordination proved challenging because of the amount of existing underground utilities on the site.