B08_Attachment_7_140P8422Q0084_Site_Visit_Notes-Q-A_0003.pdf

SOLICITATION NO. 140P8422Q0084

REPLACE BRANDY CREEK LIFT STATION NO. 2

WHISKEYTOWN NATIONAL RECREATION AREA

SITE VISIT – JUNE 30, 2022

SITE VISIT SUMMARY:

A site visit was conducted on Thursday, June 30, 2022, at 2:00 p.m. Pacific Daylight Time.

Participants met at Brandy Creek, in front of the restroom facility.

QUESTIONS AND ANSWERS RECEIVED TO DATE:

Q1: Are there bore logs or soils reports for the area that I can get access to?

A1: No, there aren’t any bore logs or soils reports available for the area. The project specs assume that since a lift station was at that spot before, it can be done again (in about the same footprint).

Q2: Is there any information from the initial build as to what material they encountered? My company deals with dewatering primarily and I'm trying to figure out what tools would be necessary. So, if I know there's a rock formation or large cobbles, I can price accordingly.

A2: Unfortunately, we don’t have any information regarding the excavation for the existing structure. The proposed structure is generally going back into the prior excavation, so we are not that concerned about hitting rock because, for the most, part we will be removing old fill. However, from web soil survey Web Soil Survey - Home (usda.gov) there is indication that bedrock is fairly shallow here. It would not be surprising if the existing wet well is in a bedrock excavation. We would also anticipate that the groundwater level in the area to be heavily influenced by the reservoir level. While we can’t say with any degree of certainty, we don’t anticipate that a great deal of dewatering will be needed.

Q3: Your attention is directed to section 31 23 00 -1.6 A. 1. Is rock excavation anticipated ? Is there a geotechnical report available?

A3: We don’t have any information regarding the excavation for the existing structure. The proposed structure is generally going back into the prior excavation, so we are not that concerned about hitting rock because for the most part we will be removing old fill. However, from web soil survey Web Soil Survey - Home (usda.gov) there is indication that bedrock is fairly shallow here. It would not be surprising to if the existing wet well is in a bedrock excavation. We would also anticipate that the groundwater level in the area to be heavily influenced by the reservoir level. While we can’t say with any degree of certainty, we don’t anticipate that a great deal of dewatering will be needed.

Q4: Your attention is directed to section 03 40 00 -1.4 A. 3. “Certificates” Cook Concrete Products is the Northern California’s precast concrete supplier and they are not NPCA certified plant. Consider removing this requirement.

140P8422Q0084, Site Visit Notes

A4: Specification 034000 calls for the precast supplier to be NPCA certified. This requirement is removed to allow for use of local precast suppliers.

Q5: Your attention is directed to section 33 32 19 -2.1. There, you call out manufacturers KSB, Flygt or pre-approved equal. Please pre-approve a Keen Pump manufacturer.

A5: No. This product is not preapproved. It’s not an equal.

Q6: A question was asked about an existing oak tree located near the lift station.

A6: The plans show protecting the tree. Upon further consideration the NPS realizes that the tree will likely need to come out. The NPS will remove the tree prior to the project.

Q7: Will NPS be responsible for pumping out the existing lift station prior to construction?

A7: The NPS will arrange for the pumping of the existing lift station wet well prior to demolition through the use of an existing service contract.

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