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BOWEN TECHNICAL APPROACH <br />kDutchlandLLC <br />Innovation. Experience. Eco-friendly. <br />160 Route 41 I Gap, PA 17527-9410 <br />Phone 717.442.8282 1 Fax 717.442.9330 <br />www.dutchlandinc.com ®OO <br />South Bend Indiana <br />Bo w e n- D u t c h la n d A d v a n t a g e s <br />June 26, 2023 <br />Bowen Engineering Corporation <br />8802 North Meridian St. <br />Indianapolis IN 4626o <br />ATTN: Steve Nutt <br />Bowen and Dutchland are interested in teaming up for the construction of the South Bend CSO 045 EQ <br />Basin at WWTP. The scope of work provided by this team includes the structural design of the precast <br />post -tensioned concrete EQ Basin, the precast manufacturing of the tank wall panels, the cast -in -place <br />tank base slab and the erection of the precast tank. Dutchland engineers will provide calculations and <br />shop drawings of the precast EQ Basin sealed by a professional engineer licensed in the state of Indiana. <br />Dutchland will also manufacture the precast panels. Bowen will install the cast -in -place base slab. Bowen <br />will also erect the precast wall panels and grout the joints between wall panels. Dutchland certified crew <br />will post -tension the tank walls. The tank will be completed by Bowen with the grouting and sealing of the <br />base -to -wall joint. Dutchland will provide a two year warranty on the tank. The customer may choose to <br />upgrade to a five year tank warranty. <br />The Bowen — Dutchland team brings several advantages to the construction of the CSO 045 EQ Basin: <br />• Bowen-Dutchland is an experienced tank construction team. We used this same model to <br />successfully construct the Abner Longley Tank in Lebanon Indiana. Bowen and Dutchland have <br />demonstrated that we work together to address each aspect of tank construction. Bowen is the <br />only contractor that has installed a Dutchland designed and manufactured tank in Indiana. <br />Dutchland has also been a subcontracted tank supplier on other Bowen tank projects around the <br />country. <br />• The team will bring schedule benefits to the EQ Basin construction. On site construction time is <br />compressed because precast manufacturing occurs off site, and simultaneous with on site <br />construction steps. The precast wall panels will be in production while the site is excavated and <br />the subgrade is prepared. Precast tank construction is a proven time saver in cases where a deep <br />foundation is needed to support the tank. <br />• It appears that the EQ Basin excavation may need to be dewatered until the tank is leak tested and <br />backfilled. By reducing on site construction time, and the reliable leak test pass record of precast <br />tanks, the team can provide significant saving in dewatering energy expenditure and cost. <br />• Reduced on site construction time will also reduce the amount of time that the WWTP flow will <br />need to be routed through temporary piping. Precast tank construction is largely confined to the <br />actual tank site after the precast panels have been erected. This frees up the construction site and <br />will allow the permanent line work to be performed without interruption, while the EQ Basin is <br />still under construction. <br />• Due to reduced concrete volume and efficient mix design, precast concrete tank construction has <br />lower greenhouse gas emissions than comparable construction techniques. <br />ENVIRONMENTAL ENGINEERING CONCRETE STRUCTURES <br />