Addendum 2 RFP_MRWG Monitoring_PWG126-LANDD-6108~1.pdf

ADDENDUM NO. 2

REQUEST FOR PROPOSAL NO. PWG126-LANDD-6108

NPDES Phase 2 MS4

MRWG Receiving Water Monitoring Program January 20, 2026

By ePro System

Questions and Answers:

1. Table 5-1 of the Program’s QAPP lists a full suite of water column nutrients to be measured (e.g., ammonia, nitrate, total phosphorus, etc.), whereas QAPP Table 4-1, Monitoring Plan Table 3-2, and Phase 2 MS4 General Permit Table 3 list only benthic algal biomass and percent cover for nutrient monitoring in receiving waters. Which is the correct list of analytes?

A. Table 4-1 provides the Receiving Water Monitoring Parameters and Frequency breakdown for each of the seasons. Table 5-1 contains the list of the constituents that will be analyzed.

Bioassessment monitoring was required by the Permit only during specified years and during a specific season, and will be required again only if mandated under the pending Phase II Permit.

Please include this in your assessment.

2. Program QAPP mentions the use of toxicity testing and the California Rapid Assessment Method (CRAM) as indicators (Section 4.7.3), while the Program Monitoring Plan and Phase 2 General Permit do not. Are these two data types to be collected as part of this monitoring program?

A. Toxicity testing and the California Rapid Assessment Method (CRAM) are components associated with bioassessment monitoring. However, bioassessment monitoring was only required by the Permit for specified years and during a specific season and will only be required again if mandated under the pending Phase II Permit. As such, toxicity testing and CRAM are not proposed to be collected as part of this monitoring program unless bioassessment monitoring is again required. Please include this in your assessment.

3. Is the California Stream Condition Index (CSCI) score to be calculated for BMI taxonomy data?

A. The California Stream Condition Index (CSCI) score is a metric associated with bioassessment monitoring. However, bioassessment monitoring was only required by the Permit for specified years and during a specific season, and will only be required again if mandated under the pending Phase II Permit. As such, calculation of CSCI scores for BMI taxonomy data is not proposed as part of this monitoring program unless bioassessment monitoring is again required.

Please include this in your assessment.

4. Should dissolved oxygen and temperature be continuously monitored for only 1-week and 2-week intervals, respectively, during each of the Spring, Summer, and Fall seasons?

A. Yes. Monitoring of dissolved oxygen and Temperature are to be monitored in a 4-to-6-hour interval over a 24-hour period. Please reference Table 4-1 and page 104 of 319 in the RWMP

QAPP.

RFP No. PWG126-LANDD-6108 Addendum No. 2

5. The Program Monitoring Plan states that as required by the Phase II Small MS4 General Permit, the MRWG will submit two Monitoring reports: 1) Baseline Report during the second year, and 2) Comparison Monitoring Report during the fifth year to compare with Baseline data. RFP Scope of Work Section V.B (RFP pg. 9) under Project Description does not include drafting of an annual report as part of the reporting tasks. Given that the Baseline Report was submitted as part of the 2014-2015 Annual Report, will a continuing Comparison Monitoring Report be required?

A. Monitoring Report was required by the Permit only during specified years and will be mandated again only if the new Phase II pending permit requires it. Please include in your assessment.

6. It does not appear that stormwater sampling is required as part of this monitoring program, but stormwater and wet-weather are mentioned in the 2014 Program Monitoring Plan. Does the scope of work include only dry weather (non-stormwater) monitoring?

A. Yes. Monitoring will only be done during Spring, Summer, and Fall.

7. Does the Fee Proposal require a monitoring dollar cost total for each fiscal year, or are only labor, material, and equipment rates required for each fiscal year?

A. Both. Please provide a total fiscal year dollar amount. Provide a breakdown of labor, equipment, lab rates, miles, etc. for each fiscal year of the contract.

8. Are analytical lab costs to be included in the fee proposal?

A. Yes.

9. Are minor revisions to QAPP allowable, such as field decon methods?

A. Continue to follow QAPP as is.

10. Would distilled water be an acceptable replacement for deionized water?

A. Continue to use deionized water.

11. Do duplicate water samples require a churn splitter?

A. Duplicate water samples will not require a churn splitter.

12. Are sediment samples collected in the water or soil from the bed?

A. Sediment samples are collected from soil from the bed.

13. If soil samples are collected, would composite samples be acceptable?

A. Yes. Reference Attachment 3 - Example SWAMP Water Quality Field Conditions and Bioassessment Data Log Sheets, and Chain-of-Custody, (see sheet 151 to 158 of the QAPP).

14. In the sampling frequency and methods table, continuous sampling for one week: is this daily for that (one or two) week during the spring, summer, and fall or once per week?

A. The “continuous” refers to daily.

RFP No. PWG126-LANDD-6108 Addendum No. 2

15. Could grab samples be collected with a swing sampler and then deposited into sample bottle by hand?

A. Preferred method is described in the Receiving Water Management Plan, section 4.2.1, “Direct Submersion: Grab Sample (Water and Sediment Sampling)”. If Direct Submersion method is not possible, swing sampler may be used.

The addition of these requirements shall be considered in concert with existing documents in preparation of the proposal. THE PROPOSER’S CERTIFICATION FOR THIS ADDENDUM NO. 2 SHALL BE SIGNED BY THE

SAME PERSON WHO SIGNS THE PROPOSAL AND SHALL BE SUBMITTED WITH THE PROPOSAL.

Arlene B. Chun, M.S., P.E.

Engineering Manager Environmental Management Division

ABC:JD:RG:xx

PROPOSER'S CERTIFICATION

By my signature hereunder, I acknowledge receipt of Addendum No. 2 and I fully understand the intent and detail of Addendum No. 1, which I have considered in my preparation of the attached proposal.

Proposer's Signature Date