8-YOSE_158675B_Q_and_A's_as_of_2.14.18,Amend_1.pdf

Rehabilitate El Portal Sewer - Phase 2 No. Date of

Question Question Response Response

1 1/11/2018 When reviewing the subject project specification section: 33

32 13.13B SEWAGE LIFT STATION UPGRADE (TRAILER

COURT) and related drawings sheet 8 of 119 and 57 of 119, I came up with different Flygt pump/motor selections for the multiple design operating conditions (GPM @ TDH) shown on page 3 of the specification section 33 32 13.13B sewage lift station upgrade (trailer court). (Please clarify).

The primary & secondary duty points (GPM & TDH) listed in paragraph 2.1.A are correct (430 GPM at 28 feet TDH and 580 GPM at 20 feet TDH). The primary & secondary duty points (GPM & TDH) listed in table 2.1.A.1 are incorrect and should be disregarded.

The remaining data listed in table 2.1.A.1 are correct.

2/14/2018

2 2/8/2018 May the roads be closed at the Trailer Court lift station and at the wastewater treatment plant during the construction at those locations?

Yes. These roads may be closed for the limited period of construction at these locations.

2/14/2018

3 2/8/218 The Sewer Bypass Concept Plans indicate two 6” HDPE bypass pipes. Will other types & sizes be considered?

The bypass plans in the plan set are conceptual only. The contractor shall prepare and submit specific bypass plans for approval. Depending on the individual location’s bypass flow rate and bypass time & duration, other pipe sizes and pipe types may be acceptable. Other means of collecting and safely transporting the wastewater will be considered.

2/14/2018

4 2/8/2018 Will a single bypass line be considered? A single bypass pumping line may be considered, if reliable, safe, immediate redundant capability is proposed and approved in advance. A minimum of two-person, full-time monitoring and response capability is required during bypass operations, in case of any failure of the primary bypass system.

2/14/2018

5 2/8/2018 Sheet 87 (E1.4), keyed note 7 indicates an existing spare conduit to SCAD cabinet. Does this spare conduit exist?

Yosemite utility staff reports that this spare conduit exists as shown diagrammatically.

2/14/2018

6 2/8/2018 Rock excavation specification 31 23 16.13 1.3 A defines rock as material unable to be removed by a specific track mounted hydraulic excavator or a specific track-mounted loader. What if the contractor uses other equipment for excavation?

Other reasonably equivalent excavating equipment, that the contractor proposes to use for excavation will be considered.

2/14/2018

7 2/8/218 Sheet E3.1 calls for a TVSS device to be installed on the meter main. There are no specifications for the TVSS.

Please advise.

Estimate TVSS per standard industry practices and electric codes. On the Phase 1 lift stations the following were installed: GE Critical Power and a Low Exposure (25kA to 50 kA) Tranquell Wall Mounted Surge Protection Device (SPD).

2/14/2018

8 2/8/2018 The general description of work in Solicitation Section C states that all new manholes and precast concrete vaults will have factory applied polyurea lining. The specifications say otherwise. Please clarify.

The specifications that call for factory or field applied epoxy coating are correct and will govern.

2/14/2018

9 2/13/2018 In the specifications it states that the generator must be sized to handle an 88 KVA inrush with less than a 15% Voltage drop. In order to meet this capacity the generator would need to exceed the 35 KW sizing requested in the specifications. Please clarify what the generator sizing needs to be for this project.

Answer pending

Q&A