Site_Visit_Q A.pdf

Q&A FROM DOCK 3 CHROMIUM 6 SITE VISIT 13/15 SEPT 16

1) Does the gov’t need 100 samples of each lead and chrome 6 totaling 200 or 100 total?

Contractor needs to take 100 sample locations for hexavalent chromium and lead. If contractor can perform and analyze on one swipe then they can do one sample from 100 locations. If the swipe sampling methods are different then they will need to perform 2 swipe samples at each locations. Totaling 200 sample overall.

2) Does the corrugated metal around the base of the inside need to be removed and cleaned behind?

The corrugated metal around the inside does not need to be removed, but any open vent needs to be removed and cleaned.

3) With the complexity of the HVAC system, is CE okay with contractor cutting into the vents to clean?

If the vents are cut into they will need to be patched and sealed air tight using approved SMACNA products.

4) What are the dimensions of the hanger LxWxH?

241’-6”x129’-4-1/2”x60’

5) Can we get an extension until the 19th to submit quotes?

Solicitation has been extended until the 19th

6) Can the fire suppression system be turned off while contractors are working in building?

Need to check with Fire Prevention, but this can be determined after contract award

7) For your clearance criteria for:

- Hexavalent Chromium you have listed that is should be <7.5 micrograms per 100 cm².

- Lead should be <4.3 micrograms per 100 cm².

Could you let me know what analyzation method this is based on?

Contaminant Media Solvent Sample Size Lead NIOSH Method

Gauze or Filter

Distilled Water 100 cm2

Hexavalent Chromium

Method W4001

WIPES OR MCE

FILTER

Preferred Medias:

(a) 0.45 mm 37 or 47 mm binderless quartz fiber filter (rough or smooth surfaces)

None 100 cm2

(b) 5 um, 37-mm PVC filter (smooth surfaces)

(c) Chrome plating:

PVC or binderless quartz: immediately place in glass vial containing 10% Na2CO3 with 2% NaHCO3.

Also, the Lead level is for air sampling. Lead clearance wipe levels for floor, according to EPA should be <40 µg/ft².

8) Are you requesting Lead clearance wipes as well?

We are not requesting floor clearance samples.