Addendum #1

February 10, 2020

Revised Price Sheet

Question 1:  Will all the water be drained completely?  

Response:  Yes, our intention is to dewater the reservoir completely as best as we can.  We cannot guarantee the reservoir will be completely dry but close to it.   The contractor may choose to have a wet dry-vac available.

Question 2:  If we must pump it out will they provide pumps?  

Response:  Lake County can provide a sump pump.  Any water that accumulates during the cleaning will need to be removed by the contractor.  The contractor shall squeegee the excessive water to the pump pit.

Question 3:  Where is the water being pumped to? 

Response:  To the drain pit located along the northern wall. Operations staff will point this out.

Question 4:  North vertical wall on interior wet side of reservoir has existing Tnemec Elasto-Shield Coating that has been previously applied.  Assuming NSF requirements of 50.0 to 80.0 Mils DFT, what is the required surface preparation to this wall surface area so that the cracks and specified Xypex Coating can be applied?   

Response:  

1. The Elasto-Sheild shall not be removed from the whole wall.
2. The contractor is to identify the failed locations that correspond to the cracks in the wall in the pump room.  Note: it appears there are three to four locations that need attention. Rather than the whole wall.
3. Each failed location shall be cleaned, abraded with 60 grit sandpaper or grinder a good six (6”) on either side of the crack. Apply one stripe coat Tnemec-Bond Clear Series V260.  Apply one coat of Elasto-Sheild 264 to a minimum 60 Dry Mils over the V260.
4. If larger cracks are found, the area may require chipping out and creating a V-grove. Treat the aera as above and fill the crack with fiber mesh and apply a second coat of Elasto-Sheild 264 over the area.  Contact Eric Otten Taylor Coatings for additional directions and proper application.

Question 5:  On specification Scope pages, paragraph 9.0 - Application of Xypex, Step C. reads as follow: “When a second coat of (Xypex Concentrate  or Modified) is required”  Please clarify as to who will make this determination as to when a second coat will be required?   Or should contractor base his price on only one coat of application?

Response: 

1. If the first application exposes holidays or some other condition dictates another coat is required as determined by the applicator or inspector.  The contractor shall apply a second coat following the manufactures guidelines.
2. One coat to cover.

Question 6:  Because not all cracks have been measured and for purposes of quantifying the crack work can the district provide a lineal footage Estimated Amount as dummy figure so that we may provide a unit price as part of the bid?  (For example, a dummy figure may be based on 100 Lineal Feet).

Response:  For purposes of quantifying the crack a figure shall be based on 20 Linear Feet.  

Question 7:  Please provide surface preparation and coating requirements for the common wall which is currently coated with a 60-80 mil thick elastomeric coating.  If coating removal is required, please include allowed methods of coating removal and the required ICRI CSP-x standard for the resultant underlying concrete surface. Sandblasting will create a surface which is much more coarse than ICRI CSP-3.

Response: 

1. The Elasto-Sheild shall not be remove from the whole wall, rather:
2. The contractor is to identify the failed locations that correspond to the cracks in the wall in the pump room.  Note: it appears there are three to four locations that need attention. Rather than the whole wall
3. Each failed location shall be cleaned, abraded with 60 grit sandpaper or grinder a good six (6”) on either side of the crack. Apply one stripe coat Tneme-Bond Clear Series V260.  Apply one coat of Elasto-Sheild 264 to a minimum 60 Dry Mils over the V260.
4. If larger cracks are found, the area may require chipping out and creating a V-grove. Treat the aera as above and fill the crack with fiber mesh and apply a second coat of Elasto-Sheild 264 over the area.  Contact Eric Otten Taylor Coatings for additional directions and proper application.

Question 8:  Please clarify SPECIFICATIONS SECTION 1. which states "high pressure water jetting to SPC-3".  SSPC SP-12 defines high pressure water jetting (HP WJ) as cleaning performed at pressures from 10,000-25,000 psi.  Is this the standard which is being specified?  Also, please define the term SPC-3.  Is the proper standard meant to be referenced ICRI CSP-3?  We are not familiar with SPC-3 standard.

Response: 

1. Power wash the walls to aggressively remove all loose materials and by pressure washing with a minimum 4000 PSI or greater with sand injection to obtain a clean surface.  Sand / blast media cannot be pumped to waste.  The contactor shall provide the means to separate the water and not damage our pump.
2. Ignore the term SPC-3 is a typo.
3. The surface must also have an open capillary system to provide “tooth and suction” for the Xypex treatment. A minimum of CSP-3 per the International Concrete Repair Institute Concrete Surface Profile Chips or other equivalent standard is required.  Surfaces to be acid-etched shall be should be saturated with water before application of the acid. After acid etching flush concrete thoroughly with clean water.  If the contractor elects to acid etch the walls, all metal components (piping and ladders) must be protected and the pH neutralize prior to discharge.

Question 9:  Since there is crack repair required, please include bid line items for the repair of cracks so that we can properly price this work as follows:

1.         Cracks greater than 1/64" wide at a per lineal foot cost basis

2.         Actively leaking cracks at a per lineal foot cost basis

3.         Expansion joints and chronically moving cracks at a per lineal foot cost basis

Response:

1. Virtually all cracks are actively leaking.  The degree of the leak may need to be addressed based on the pressure exerted from the backside of the leak.  This would be covered as Dry-Pac.
2. For purposes of quantifying the crack a figure shall be based on 20 linear feet. 

Question 10:  Please clarify that a second coat of Xypex Modified is required to be installed over the Xypex Concentrate.  If not required, please include a line item for the addition of the second coat of Xypex Modified if it is determined later that the second coat is desired.

Response:

1. If the first application exposes holidays or some other condition dictates another coat is required as determined by the applicator or inspector.  The contractor shall apply a second coat following the manufactures guidelines at their expense.
2. One coat to cover.

Question 11:  Are there as-built drawings of the tank/facility?

Response: 

1. Yes, attached are the Plans for Greggs Landing. 
2. Approximate Dimensions:  Width = 61’, Length = 81’, Height = 16’

Question 12:  Does the pump room/tank common-wall have an existing elastomeric coating applied to the wet (tank) side?  We were the coating applicator when the facility was constructed, and I believe we coated the common-wall with Tnemec Series 264 Elasto-Shield @ 50-80 mils DFT.

Response:  Yes, to the best of our knowledge Elasto-Sheild series 264 was applied to the common wall.

Question 13: Are all four walls, floor and ceiling being coated with Xypex.

Response:

1. The three (3) bare walls not coated with Elasto-Shield, shall be treated with Xypex from the floor upward to the ceiling.
2. The contractor shall apply Xypex to the floor extending 24” from the wall along the three bare walls.
3. The ceiling shall be excluded, and
4. The contractor does not need to protect the ceiling while pressure washing or applying Xypex.

Question 14: What is the budgeted amount for this project?

Response:  $75,000

Question 15:  Is a 100% bond necessary for this project?

Response:  A ten percent bid bond is required with bid submission.  Upon contract award Lake County requires a 100% performance and payment bond.