Need to return call by / at/between and . Signature: 

 Project No.: 0172.08.005.607 Page 1 of 3 

 Project Name: 2011 Prelim Cat Rev CBI? 

 Yes 

 No 

TELEPHONE CALL RECORD 

 Incoming 

 Outgoing 

Date: 08/24/11 Time: 2:00 am 

 pm 

Company Name: Horsehead Corporation ERG Staff Name: Elizabeth Sabol 

Contact Name: David Swisher Contact Phone Number: (724) 774-1020 

General Subject: 2009 DMR Fluoride Discharges 

TOPICS DISCUSSED AND ACTION TAKEN 

I called Mr. Swisher on Wednesday, August 24, 2011, at 2:00 pm to discuss fluoride concentrations for outfall 

101 in the 2009 DMR database. Mr. Swisher stated that he would work on gathering the information for 

fluoride concentration data and call me back. 

On August 26, 2011, Mr. Swisher called me back to confirm the fluoride concentrations for outfall 101 in the 

2009 DMR database. Mr. Swisher confirmed that the outfall is later combined with outfall 001. Mr. Swisher 

stated that the fluoride concentrations reported for outfall 101 were correct. Please see the following table of 

fluoride concentrations: 

Monitoring Period 

Date 

DMR Loadings Tool 

Monthly Average Fluoride 

Concentration at Outfall 

101 (mg/L) 

DMR Loadings Tool 

Monthly Average Flow for 

Outfall 101 (MGD) 

31-Jan-09 229 1.312 

28-Feb-09 261 1.071 

31-Mar-09 364 0.883 

30-Apr-09 332 0.78 

31-May-09 139 0.815 

30-Jun-09 134 0.817 

31-Jul-09 398 0.768 

31-Aug-09 448 0.704 

30-Sep-09 213 0.787 

31-Oct-09 231 0.668 

30-Nov-09 391 0.535 

31-Dec-09 178 0.285 

Mr. Swisher stated that he would follow-up with me on how the fluoride enters the wastewater and the 

corresponding wastewater treatment for fluoride. Please see the following e-mail attachments. 
Need to return call by / at/between and . Signature: 

From: Swisher David <dswisher@horsehead.net> 

To: "elizabeth.sabol@erg.com" <elizabeth.sabol@erg.com> 

Date: 9/12/2011 9:21 AM 

Subject: Horsehead Corp. - Fluorine Sources 

Attachments: Fluorine Sources.doc 

Elizabeth; 

Sorry this took so long. I was away on vacation for a week. 

I believe the attached write-up should answer most of your questions regarding the source of fluoride in our WWTP discharge. We do not treat the effluent specifically 

for fluoride. 

Let me know if you have any further questions. 

------------------------------------------------ 

David B. Swisher 

Manager, Environmental Affairs 

Horsehead Corporation 

300 Frankfort Road 

Monaca, PA 15061 

724.773.2284 Office 

724.773.2242 Fax 

724.494.8066 Mobile 

dswisher@horsehead.net<mailto:dswisher@horsehead.net> 
Need to return call by / at/between and . Signature: 

MEMORANDUM 

 

 

TO: David Swisher DATE: 9/2/2011

FROM: Eric Johnson 

SUBJECT: Fluorine Sources

Fluorine enters our process through two primary sources, these are crude zinc oxide 

(CZO) and HRD calcine (calcined CZO). Both sources bring about the same overall amount of 

fluorine into our process. The CZO enters our process through the CZO clarifier system. Some 

of the fluorine dissolves into the water and travels to the waste water treatment plant (wwtp) via 

the clarifier over flow. The CZO filter cake is then processed in the sinter plant with HRD 

calcine and other secondary materials. This sinter plant generates sinter, which is processed in 

the furnace plant, and a fume byproduct which is filtered by a bag house system. 

The sinter is sent to the furnace plant where the majority of the fluorine exits our process 

via the discard slag. There is also an aqueous waste stream generated we call blue powder. The 

blue powder and sinter dust from the bag house are sent to the zinc sulfate clarifier system. 

Similar to the CZO clarifier system some of the fluorine dissolves into the water and the 

overflow is sent to the wwtp. 

The process water at the wwtp is processed in the wwtp clarifier. The wwtp clarifier is 

designed to eliminate heavy metals (zinc, cadmium, and lead) and operates in a pH range where 

these metals are insoluble. However, at these pH levels the fluorine is slightly soluble and 

therefore the discharge from the wwtp (101 outfall) contains some fluorine.