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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 exceed 29 nephelometric turbidity units (NTU) above background conditions. Where applicable, the CONTRACTOR shall maintain appropriate water quality monitoring records demonstrating compliance with turbidity requirements in the receiving water body. a. Biscayne Bay is a protected body of water. Water quality standards to discharge into the bay are very difficult to impossible to attain. Can we assume that development discharge will go into nearby wells? Response: Yes. Please refer to response #9. b. What is the protocol for development water if the 29NTU standard is not reached? The wells North Bay Road Drainage Improvements Invitation to Bid No. 18-04-01 Response to Questions Page 3