Enc(1)_Government Response_A0001_16Jun20.pdf

SOLICITATION NO. N4008420T5410

PROJECT TITLE/LOCATION: LANDFILL LONG TERM MONITORING SAMPLING AT U.S. MCAS IWAKUNI, JAPAN

Amendment 0001 Enclosure (1)

Page Section Para.

1 10‐Jun‐20 2 of 13 Task 1 1 The OSW states " Contractor shall provide water‐level probe, peristaltic pump, multi‐parameter probe with flow cell, and a turbidity meter. All groundwater parameters will be recorded on field sheets."

However, the scope does not species exact parameters need to be taken. Please specify what field measurement parameters are required for this project?

2 10‐Jun‐20 2 of 13 Task 1 1 Is purging of well water required before sampling? If so, how much of well volume should be purged?

3 10‐Jun‐20 2 of 13 Task 1 1 Could water sampling be collected with new and disposable bailers?

Because maximum lift of typical field peristaltic pump are about 7m and depending on the water table level, sampling with peristaltic pump may not be feasible for the depth of those wells.

4 10‐Jun‐20 2 of 13 Task 1 1 Parameters for groundwater listed in Table C7.T2 of JEGS 2018 lists Dioxin without the standard value nor crossing off. How would you apply for this contract whether to include or not to include as an analysis item?

5 10‐Jun‐20 3 of 13 Task 2 1 What are the diameters of each monitoring wells

6 10‐Jun‐20 3 of 13 Task 2 1st bullet " EPA equivalent certified laboratory" would this be included Chemical Analysis Laboratories registered by the local prefectural governor in Japan?

Amend No.

Question No.

Date Received

REFERENCE

QUESTION GOVERNMENT RESPONSE

Standard field parameters: pH, conductivity, temperature, dissolved oxygen (DO) and oxygen‐reduction potential (ORP), turbidity

Per Figure 3 of the attached, Enclosure 2 "Groundwater and Methane Monitoring Wells As‐Builts" each monitoring well has an outer diameter of 150 mm. Five of the wells are combination groundwater/methane monitoring wells and these have 55 mm diameter inner monitoring wells installed.

The appropriate JIS method is acceptable.

Purging should be done for one hour or until groundwater parameters stabilize.

As long as methodology meets JEGS sampling requirements.

Peristaltic pumps are used by the current contractor to sample groundwater. Since wells are 55mm diameter, it may be difficult to monitor with bailers.

No Dioxin sampling is required.