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Wednesday, April 25, 2018 Section 2.2-part A Certa-Lok SOR 17 locked coupling PVC casing or equivalent. Any equivalent casing selected must be shown to have sufficient joint and tensile strength, internal pressure rating, resistance to collapse and ability to withstand all stresses of construction. Any alternates must be approved in advance by the ENGINEER. Reference is made to two different types of casing. Can we assume SCHD 40 PVC bell end casing will be used? This type of pipe will reduce cost and will be sufficient for the casing depths at the site. Also note the largest diameter SOR 17 has a pipe of ID of 15" while 18" DIA SHCD 40 PVC has an ID of approx. 16.8". Response: 18" DIA SHCD 40 PVC shall be used. 9. Can wire brushing be substituted for water jetting to clean existing steel casing? Response: Wire brushing can be substituted for water jetting to clean the existing steel casing. 10. Regarding well cleaning. Common industry practice for cleaning stormwater wells in South Florida is to circulate water back to the well this provides sediment control while limiting impact to road traffic and residents. Typically drill rods are used to drill each well back to original depth utilizing flooded reverse air drilling method. Sand and debris will settle in the drillers sludge tank while continuously circulating water back to the well/well box. Used in conjunction with mechanical surging produces tremendous gains in capacity. Can this method be used for the well cleaning? Response: Yes, above described method can be used. 11. Pay Item #15 Design-Build services that may include but not limited to engineering design, testing, permitting with all applicable agencies, materials, labor, and equipment to convert selected drainage wells to injection wells. There is not enough available information at this time to price alternate item #15. We recommend the city includes an allowance for this item. Response: Alternate 15 is excluded. Contractors are not required to provide bid for this alternate 15. Upon further investigation, should the addition of injection wells be deemed necessary, further negotiations will be conducted with successful contractor. 12. Section 03500 Section 3.2 Part E E. The CONTRACTOR shall employ Best Management Practices (BMPs) to mitigate potential turbidity and/or solids from entering any surface water body receiving discharge water. The CONTRACTOR shall install and maintain silt booms, curtains, or other means required to protect any surface water body receiving the discharge water. Surface water receiving discharge water shall not