 


                                  MEMORANDUM


TO:		William Herz, NLA

FROM:	Jonathan De'Ath, NLA

SUBJECT:	Lime Risk and Technology Review EPA Emissions Database Review Findings

DATE:	April 19, 2018
____________________________________________________________________________

Tab A.5 Kiln_HCl_Data
 HCl test results for Graymont Pleasant Gap kiln 8 should be excluded from calculation of the New Kiln default HCl (lb/hour) (row 41, column P). The new Pleasant Gap Kiln 8 is a gas-fired vertical kiln and not representative of straight rotary, or preheater rotary kilns burning solids fuel.

Tab A.7 Kiln_Dioxin_Furan_Data
 The Lhoist Montevallo dioxin/furan data is excluded from the default calculation because of combined stacks. However, based on test report, the testing location is before the exhaust streams combine, so the data are OK to use.
 Kiln 1 at Martin Marietta uses an ESP (not a fabric-filter baghouse) so may not be representative depending on the operating temperature.

General Comments
 There looks to be an error calculating emission for certain HAPS (e.g., o-HAPs and dioxin/furans) for lime plants with 2 or more kilns that vent to a single stack. Please verify that for kilns with combined stacks, and without actual lbs/hour emissions data, that the calculated emissions on tab A.9 reflect the actual number of kilns, i.e., HAP default lbs/hour emissions data multiplied by the number of kilns. Conversely, if a kiln vents to two stacks (for example Lhoist Montevallo), default emission rates should be halved.
