From: Emmanuel Quizon [equizon@aqmd.gov]

Sent: Wednesday, July 17, 2013 12:48 PM

To: Land, Eva

Cc: Fred Del Rosario

Subject: RE: Particulate Emissions from Spraying Operation

Eva,

I am not sure about the date but the 20% fall-out factor was derived from a field evaluation done by a 

permit engineer.

Emmanuel

From: Land, Eva [mailto:Land.Eva@epa.gov] 

Sent: Wednesday, July 17, 2013 7:18 AM

To: Emmanuel Quizon

Subject: RE: Particulate Emissions from Spraying Operation

Emmanuel,

Do you happen to know how the 20% fall-out factor was derived? 

Thanks again!

Eva Land

Air Permits Section

EPA - Region 4

61 Forsyth St., SW

Atlanta, GA 30303

Phone: 404-562-9103

From: Emmanuel Quizon [mailto:equizon@aqmd.gov] 

Sent: Tuesday, July 16, 2013 11:47 AM

To: Land, Eva

Subject: RE: Particulate Emissions from Spraying Operation

Eva,

For materials with very high solids we do not increase the fall-out factor We usually do a field 

evaluation to observe the spraying operation. High-solids materials tend to be very viscous thus 

increasing the transfer efficiency.

With your other question regarding PM10 and PM2.5, we do not differentiate between the two. As of 

now we only keep track of PM10 in our New Source Review (NSR) database.

Emmanuel
From: Land, Eva [mailto:Land.Eva@epa.gov] 

Sent: Monday, July 15, 2013 2:01 PM

To: Emmanuel Quizon

Subject: RE: Particulate Emissions from Spraying Operation

Emmanuel,

Also, would the fall-out factor change depending on the paint? For example if one paint has a 

significantly higher solids factor?

Thanks again.

Eva Land

Air Permits Section

EPA - Region 4

61 Forsyth St., SW

Atlanta, GA 30303

Phone: 404-562-9103

From: Emmanuel Quizon [mailto:equizon@aqmd.gov] 

Sent: Friday, July 12, 2013 4:10 PM

To: Land, Eva

Subject: Particulate Emissions from Spraying Operation

Eva,

Below is the equation and the filter control efficiency we used for calculating particulate emissions from 

spraying operation. For spray equipment other than HVLP or electrostatic spray gun we use a transfer 

efficiency of 35% unless test data on the spray gun transfer efficiency is provided and approved by the 

SCAQMD. For open spray equipment we use a fall-out factor of 20%. No fall-out factor is given for 

coating operation using a spray booth because all the overspray should be collected by the spray booth.

For wet coating operation we assume that 50% of PM is PM10. For powder coating operation we 

assume that PM is equal to PM10.

If you have any question you can give me a call at (909) 396-2523.

Emmanuel

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