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Viewing inquiries for 08-1F8304

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Inquiry #1: Would polyurethane foam injection grouting be considered as an approved alternative to cementitious compaction grouting for this project?

We have been allowed to propose this method on previous projects for Caltrans that were initially designed for cement compaction grouting.

Inquiry submitted 06/18/2018

Response #1:submitted for consideration
Response posted 06/18/2018

Response #2:Polyurethane foam injection grouting is not appropriate at this location. Please bid per current contract documents.
Response posted 06/20/2018

Inquiry #2: May I ask why Caltrans feels polyurethane grouting is not appropriate for this location? Looking at the project documents it appears that it would be a very good lightweight alternative to compaction grouting in this type of situation as it will not add much weight to the top of the pipe.

If rocky soil conditions are present, holes could be pre-drilled to facilitate installation of injection tubes.

Inquiry submitted 06/20/2018

Response #1:submitted for consideration
Response posted 06/20/2018

Response #2: Please bid per current contract documents.

OGDS has extensive experience using low slump sand/cement grout and polyurethane grout. The sand/cement grouting operation as specified in the Special Provisions is the appropriate method for the site given the site material, grout tube driving characteristics, depth of grouting, multi-lift grouting at each grout point, ability to monitor and control grout cut-off criteria and use data feedback to refine grouting procedure, ability to adjust grout mix to achieve optimum results.

Driving high strength grout probes provides superior information on relative soil density and position of cavities as opposed to drilling. Driving is typically faster than drilling allowing more production within the required lane closure. OGDS knows the site soil conditions and the techniques that may be affectively applied given the soil conditions.

Response posted 06/21/2018

Inquiry #3: Can a low density low exothermic foam such as NCFI 27-004 be used to fill / abandon the culvert?
Inquiry submitted 06/21/2018

Response #1:Please see Special Provisions 71-6.03C. Bid per current contract documents.
Response posted 06/25/2018

Inquiry #4: Can you pls provide more information for the Cured In Placed pipeliner items, like kind of resin required, Required Tests, Curing process, etc..
Inquiry submitted 06/26/2018

Response #1:submitted for consideration
Response posted 06/26/2018

Inquiry #5: Grout injection rate of 10 cubic feet/minute looks excessive. ASCE 53-10 recommends maximum pumping speed of 2 cubic feet/minute, unless filling voids. Please provide maximum pumping speed.
Inquiry submitted 07/10/2018

Response #1:submitted for consideration
Response posted 07/10/2018

The information provided in the responses to bidder inquiries is not a waiver of Section 2-1.07, "JOB SITE AND DOCUMENT EXAMINATION" of the Standard Specifications or any other provision of the contract, nor to excuse the contractor from full compliance with the contract. Bidders are cautioned that subsequent responses or contract addenda may change a previous response.

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