PUR-1241 ADDENDUM NO. 2 INVITATION TO BID GREENSAND FILTER SYSTEM AT ELK RIDGE WATER TREATMENT PLANT

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1 WASHINGTON COUNTY PURCHASING DEPARTMENT Washington County Administration Building 100 West Washington Street, Room 320 Hagerstown, Maryland Telephone: , FAX: ADDENDUM NO. 2 INVITATION TO BID GREENSAND FILTER SYSTEM AT ELK RIDGE WATER TREATMENT PLANT DATE: Friday, January 31, 2014 BIDS DUE: Wednesday, February 12, :00 P.M. To Bidders: This Addendum is hereby made a part of the Contract Documents on which all bids will be based and is issued to correct and clarify the original documents. Please acknowledge receipt of this Addendum at the appropriate space on the Proposal Form. This Addendum consists of six (6) pages and two (2) Attachments A and B. ITEM NO. 1: Inquiry: Minimum flow is 45 gpm, what is max? Response: The maximum flow rate is 60 gpm. ITEM NO. 2: Inquiry: Minimum daily usage is 6000 gpd, what is max? Response: The maximum usage will be 10,000 gpd. ITEM NO. 3: Inquiry: Is the design pressure really 200 psi? If not, what is it? Response: Yes, the design pressure is 200 psi. ITEM NO. 4: Inquiry: Have you specified any tank or pipe size? Response: The County has not specified any tank size. The only sizing requirements are that the skid must be able to fit through the existing double doors. See Attachment A to this Addendum; drawing is not to scale. ITEM NO. 5: Inquiry: Has there been any media depth or max flow per sq. ft of media specs made? Response: No, there has not been any media depth or max flow per sq. ft of media specs made.

2 Page 2 ITEM NO. 6: Inquiry: Is Greensand Plus with anthracite acceptable? Response: Greensand Plus with anthracite is acceptable. ITEM NO. 7: Inquiry: How is the system to be regenerated? With chlorine or potassium permanganate? Is it continuous or batch regeneration? Response: Chlorine is fed into the raw water prior to entering the filters. ITEM NO. 8: Inquiry: Are the chemical feed systems in place or do we need to provide? Response: The chemical feed system is in place. The PLC will need to turn the pump on and off. In addition to controlling the chemical feed pumps, the PLC will also need to turn the well pump on and off based on readings from a pressure transducer. The County will purchase and install the pressure transducer in the finish water line. ITEM NO. 9: Inquiry: What is the ph of the water? Response: The ph ranges from 7.0 to 7.3. ITEM NO. 10: Inquiry: Spec mentions separate source backwash water. Does the proposed system need to process water or does it come from a totally separate source? Response: The backwash water is stored finish water. ITEM NO. 11: Inquiry: Does the treated flow rate/ quality need to be maintained when one tank is in a backwash? Response: The design flow rate does not need to be maintained while backwashing. ITEM NO. 12: Inquiry: What is the system design maximum flow rate (in gallons per minute)? Response: The maximum flow rate is 60 gpm ITEM NO. 13: Inquiry: Which A-B Panel View 400 are you specifying: Gray Scale Touch Screen, Gray Scale with Touch Pad, Color Touch Screen or Color Screen with Touch Pad? Response: The screen shall be a color touch screen. ITEM NO. 14: Inquiry: Is the Control Panel to be Fierglass? Response: A fiberglass enclosure is acceptable.

3 Page 3 ITEM NO. 15: Inquiry: Piping and hardware: Galvanized or Stainless Steel? Response: Galvanized hardware is acceptable. ITEM NO. 16: Inquiry: To minimize backwash water generation should the system include a flow meter so backwashing can be based on load (amount of Iron and Manganese) removed or timed cycle? Response: Backwashing can be based on a preprogrammed timed cycle. ITEM NO. 17: Inquiry: Do you prefer the skid framing be Painted Steel, Stainless Steel, Galvanized Steel or Powder Coated Steel? Response: Powder coated steel is acceptable. ITEM NO. 18: Inquiry: Please let us know how you wish to size the filters: Minimum and Maximum Loading (gallon per min per square foot of filter area required). Inversand (manufacturer of GEENSAND PLUS) recommends a range of 2 to 12 gallons per minute per square foot of filter area depending upon iron and manganese concentrations. For this project and based on a Fe concentration of 2 mg/l and Mn of 0.5 mg/l in the Scope of Work/Specification, we suggest 5 gpm/ft² design loading but recommend not operating at under 2 gpm/ft2 (minimum loading). Response: The design loading shall be 5 gpm/ft 2. ITEM NO. 19: Inquiry: Typically, chlorine is fed upstream of a greensand filter system with a targeted second contact time for iron oxidation and longer for manganese the more the better. The current design does not allow for this length of contact time prior to the greensand filter system at the proposed 45 gpm. Does the supplier need to provide a tank to allow for additional chlorine contact time? Does the supplier need to provide a chlorine injection point in their system, or will the county provide that injection point prior to the suppliers filter system? Response: The County will purchase and install a chlorine contact tank prior to the filters. ITEM NO. 20: Inquiry: Please provide a list of the attendees of the Pre-Bid Conference that was held on Wednesday, January 22, 2014 at 10am. Response: See Attachment B to this Addendum.

4 Page 4 ITEM NO. 21: Inquiry: Delivery: a. Will the delivery location have a loading dock? Or will the skid need to be unloaded from ground level. Response: Yes, the delivery location has a loading dock and a forklift. ITEM NO. 22: Inquiry: Location of Installation: a. What are the dimensions of the installation area/location? i. Height, Width & Length ii. Accessibility area to unload a skid with equipment and what is the distance from the unload location to installation site. iii. Dimensions of door openings Height and width leading to installation area. Response: a., i. See Attachment A to this Addendum. ii. The County is responsible for transporting the equipment from the delivery site to the installation site. iii. See Attachment A to this Addendum. ITEM NO. 23: Inquiry: ASME tanks could take up to 12 weeks to receive after Purchase Order. Will this be an issue? Response: Refer to the bid document, Page 17, Supplemental Terms & Conditions, Item 5b., Delivery shall be within ninety (90) consecutive calendar days starting from the date the purchase order is received by the successful bidder. ITEM NO. 24: Inquiry: Will the county load the tanks with gravel and media? Response: The County shall be responsible for the installation of the equipment which includes loading the filters with the media supplied by the vendor. ITEM NO. 25: Inquiry: Any exception to a non skid mounted system? (ease of mobility) Response: No, the equipment shall be mounted on a skid ITEM NO. 26: Inquiry: What flow rate can the drain handle? Response: The drain can handle up to 75 gpm. ITEM NO. 27: Inquiry: Will the County be willing to negotiate any of the terms and conditions associated with the Invitation to Bid, specifically those related to consequential damages, indemnities, and caps on liability? Response: The terms and conditions are non-negotiable.

5 Page 5 ITEM NO. 28: Inquiry: On Page 17 of the supplemental terms and conditions it states delivery to be FOB destination and costs shall be included in the bid. Who has the responsibility to unload the truck and place the equipment in its final destination? Response: The County will responsible for unloading and placing the equipment in its final destination. ITEM NO. 29: Inquiry: Re page 6, question 17 MARYLAND BUY AMERICAN STEEL ACT. Please send us a copy of this act. Response: The referenced sections of the code can be downloaded from the following location: ITEM NO. 30: Inquiry: Re the attached photo illustrates a skid mounted softener w/headers & isolation valves. Since the specs do not state headers and manual valves are required, we think they are required. Please clarify if headers and isolation valves are required. a. Four (4) Headers: Service Inlet, Service Outlet, Separate Source Backwash & Separate Source Rinse. Drain piping by others b. Stainless Stool isolation valves per skid: (2) Service Inlet, (2) Service Outlet, (2) Separate Source Backwash & (2) Separate Source Rinse Response: The equipment skid is to be delivered pre-piped, which includes the headers and isolation valves. a. The number of headers required is based on the number of filters required. For a two (2) filter system, the number of headers indicated above would be correct. b. The number of stainless steel valves required is based on the number of filter required. For a two (2) filter system, the number of valves indicated above would be correct. ITEM NO. 31: Inquiry: Is the PLC to control the chemical feed pumps? Response: Yes, the PLC will need to turn the pump on and off. In addition to controlling the chemical feed pumps, the PLC will also need to turn the well pump on and off based on readings from a pressure transducer. The County will purchase and install the pressure transducer in the finish water line. ITEM NO. 32: Inquiry: What size is the raw waterline that connects to the filters? Response: The raw waterline shall be two (2) inches. ITEM NO. 33: Inquiry: What material is to be used to construct the skid? Response: Powder coated steel is acceptable.

6 Page 6 ITEM NO. 34: Inquiry: Does the PLC have alarm output? If so, how many? Response: The PLC shall have one (1) each of the following alarm output: No power, low pressure, high pressure, and no water pressure. ITEM NO. 35: Inquiry: What type of screen is required for the PLC? Response: The screen shall be a color touch screen. ITEM NO. 36: Inquiry: What type of material is the enclosure to be constructed out of? Response: A fiberglass enclosure is acceptable. ITEM NO. 37: Inquiry: Are there any size restraints on the units? Response: The unit must fit through the existing double doors. ITEM NO. 38: Inquiry: What material shall the hardware be? Response: Galvanized hardware is acceptable. ITEM NO. 39: Inquiry: I was wondering if a construction budget had been set for the above project. Response: The budget for this project is approximately $60, By Authority of: Karen R. Luther, CPPO Purchasing Director BOARD OF COUNTY COMMISSIONERS OF WASHINGTON COUNTY, MARYLAND

7 ATTACHMENT A 2" WATER LINE 9" 2" WATER LINE ENGINEER: DESIGNED BY: DRAWN BY: CHECKED BY: DATE: /28/14 9" 30" 30" 6 3 4" " 84" 20" 19" WELL LINE 48" " 24" 24" DRAIN 15" " 2" DISCHARGE " 11" PLC 15" SCADA 25" 6 1 2" 6 3 4" " 84" 20" 19" WELL LINE 48" " 24" 24" DRAIN 15" " 24" EXISTING FILTERS TO BE REPLACED PROPOSED FILTERS " 2" DISCHARGE " 11" PLC 15" SCADA 25" 6 1 2" DIVISION OF ENVIRONMENTAL MANG. WASHINGTON COUNTY, MARYLAND DEPARTMENT OF ENGINEERING SERVICES Washington County Administration Building Elliott Pkwy., Williamsport, MD Phone: Fax: " 54" " 54" EXISTING PLC TO BE REPLACED WITH NEW PLC SINK 23" BREAKER BOX 17" 30" SINK 23" BREAKER BOX 17" 30" DOOR 96" 72" 12" EXISTING LAYOUT DOOR 96" 72" 12" PROPOSED LAYOUT DESIGN CRITERIA DESIGN FLOW 45 GMP DESIGN PRESSURE 200 PSI OPERATING PRESSURE 175 PSI MEDIA GREEN SAND AND ANTHRACITE RAW WATER QUALITY 2.00 PPM FE 0.5 PPM MN DAILY WATER USAGE 6000 GPD ELK RIDGE W WATER TREATMENT PLANT FILTER REPLACEMENT LAYOUT SCALE 1":2' SHEET NO. 1 OF 1 PROJECT NO

8 ATTACHMENT B