Storm Drainage Master Plan Update

Agency:	City of Elk Grove
State:	California
Type of Government:	State & Local
Category:	C - Architect and Engineering Services - Construction
Posted:	Nov 16, 2023
Due:	Nov 30, 2023
Publication URL:	To access bid details, please log in.

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Questions and Answers

Request for Proposal

Date: November 15, 2023

Question 1

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Question 2

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Question 3

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Does the City prefer any specific software or tools or has

established as standards for similar projects?

The City requires all models in HEC-RAS format. Additional

software may be recommended by the Consultant for approval. In

the past, similar projects have used SacCalc and XPSWMM to

supplement analysis and calculations.

Does the City wish for the fee proposal to be submitted in a

separate sealed envelope from the technical

proposal/qualifications?

No. The proposal shall be submitted in a sealed envelope clearly

marked Storm Drainage Master Plan Update and contain all the

information indicated in “Guidelines for Proposal” including item 7-

Fee.

Please confirm that the previous SDMP models and/or

geospatial files are available to leverage for this SDMP Update.

All available H&H studies will be provided including the SDMP

models and geospatial files.

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Question 4

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Question 5

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Question 6

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Question 7

City of Elk Grove

RFP for Storm Drainage Master Plan Update

Questions and Answers

Please confirm that field verification of data, particularly

topographic and pipe invert/size information, are not

requested as part of this proposal.

Field verification of data may be required if needed to resolve

issues identified during the development of the SDMP.

On page 14 of the RFP (Task 5 – Determine Capacities of Major

Existing Storm Drainage Facilities), it states “At the

completion of the process all models must be in a HEC-RAS

format provided to the City in a manner that can be updated as

changes occur in the future.” Please confirm that this

requirement is not intended for the drainpipe portion of the

system. In future versions of HEC-RAS, HEC intends to include

the ability to model subgrade drainage pipes, but as of the

November 8, 2023 Beta Release this feature is not yet

available.

Correct, the drainpipe portion of the system is not included in the

HEC-RAS format but should be submitted using XPSWMM.

Assuming that the City geodatabase of the existing storm

drain network will be made available to the selected team, are

there a significant numbers of data gaps in the database for

critical fields such as inverts, diameters, etc.?

No significant data gaps are known but if any are identified during

the development of the SDMP then field verification will be

required.

Can the City expand on the LOMC Process that they are

intending to use for the individual parcels? Is a LOMA or a

LOMR path anticipated?

a) Is the intent to use the SDMP modeling results to

revise the entire floodplain as a whole for the

City? Or is the plan to use the results as "best

available" data for floodplain regulation?

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Question 8

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Question 9

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Question 10

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Question 11

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City of Elk Grove

RFP for Storm Drainage Master Plan Update

Questions and Answers

b) Is there an approximate number of parcels that

the City is anticipating for this process?

The LOMC process (LOMA or LOMR) used for removal of the

individual parcels from the SFHA will depend on the findings from

the SDMP modeling.

a) The intent is to use the SDMP modeling results to

update/revise portions of the floodplain.

b) No. The number of parcels is not known.

Should the consultant submit proposal costs in a sealed

envelope?

The entire proposal is to be submitted in 1 sealed envelope. The

cost proposal is item 7 of the entire proposal and does not require a

separate sealed envelope.

Will the 200-year 2D Hydraulic model need to include

underground storm drainage facilities and smaller watersheds,

or can it focus on overland flow paths only, including channels

and major crossings, to only satisfy meeting SB5

requirements?

The 200-year 2D hydraulic model can focus only on overland flow

paths including channels and major crossings.

Can the City provide a list (or map of coverage) of the stream

hydraulic models (generally effective FEMA models) available

from the City

Yes, the City will provide a list of the hydraulic models.

Is assessing Nolte flow conditions part of the assessment of

City Standards and capacity determinations?

Yes, assessing Nolte flow conditions is part of the assessment of

City Standards and capacity determinations but in some cases the

Sacramento method will be required.

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City of Elk Grove

RFP for Storm Drainage Master Plan Update

Questions and Answers

Question 12

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Question 13

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Question 14

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Question 15

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Under Task 6, does the City have a database of existing storm

drains identifying size, inverts and pipe materials?

The City has and will provide a database of the existing storm

drains.

Under Task 8, will the impact fee assessment include the

calculation and structuring of new fees?

No, the task is to assess the construction costs of the proposed

storm drainage improvements and O&M costs of the complete

storm drainage system and compare them to the current impact fee

assessments. The information will then be used by the City to

structure new assessments in the future if needed.

On page 7 of the RFP under 7. Fee it says: “Upon completion

of each task, the Consultant will notify the City and request

payment for the products and services by submitting an

invoice and a brief description of work performed during the

billing period. (Emphasis added)” Does this mean that billing

is task (and subtask) based (milestone billing) or that billing is

monthly and invoices are broken down by task (and subtask)?

The billing will be monthly and broken down by tasks and subtasks.

On page 14 of the RFP under Task 1 Project Management it

says: “(T)he consultant shall prepare a Project Guide (Work

Plan) and Project Schedule. The schedule shall be updated

and submitted with a monthly Project Progress Report. The

consultant shall also provide in writing a Quality

Control/Quality Assurance procedure for the Project, which

shall be submitted with the proposal.” Does this mean that the

QAQC plan should be submitted as part of the proposal

responding the RFP or does it mean that the QAQC plan will

be submitted along with the proposed work plan and schedule

during Task 1?

The QA/QC plan is to be submitted with the proposal responding to

the RFP.

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type	name(s)	due date	notice	details	posted
RFP	Storm Drainage Master Plan Update	11/30/2023 by 2:00 PM	Q and A Document	View	10/25/2023

Storm Drainage Master Plan Update

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