Document ID: EPA-HQ-OW-2006-0771-1488
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2008-09-15T04:00Z

Steam Electric Data Request Follow-Up Questions

Project Name:  Steam Electric Detailed Study

	Project No.:  0172.04.022.041

Company Name:  Georgia Power

	Contact Name:  William R. Evans

Plant Name:  Plant Wansley	Contact Phone Number: 404-506-7031

or Email Address:  wrevans@southernco.com

ERG Staff (or ERG Rep) Name: Sarah Holman

Company Affiliation: ERG	Date: 12/19/07

This document contains CBI:   ___  Yes    x       No

	Type of  Contact:     x      Email       x    Telephone           

General Subject:  Data Request Assistance / Follow-Up 

Follow-Up Question Number	CBI =

Yes (Y)

No (N)	Data Request Question Number	Data Request Page Number	

Question/Answer

1	N	8	B-3	Q: The combined cycle units (Units 6-9) operated at Plant
Wansley are not included in Table 2.  Please verify that the reason
Georgia Power did not include these combine cycle units in its data
request response is that it did not operate these units in 2006.

Please confirm that Unit 5 was not included in Table 2 because it is an
oil-fired combustion turbine with no steam electric operations.

A:  Verified.  Units 6 – 9 are typical combined cycle units: the steam
cycle is about 1/3 of the total unit.  Wastewater from these units
discharges into the ash pond and the approximate flow rates are listed
in the Form 2C.

Confirmed.

2	N	11	B-8	Q: Frequency of drainage from coal pile is given as 365 days.
 Does the plant have an estimation of the actual number of days of
drainage from the coal pile, or an estimation of the number of days of
rain in 2006?

 

A:  Mr. Evans believes that the coal pile is so large that there is
likely continuous drainage from the coal pile to the two coal pile
runoff ponds.  Water is pumped continuously from the coal pile runoff
ponds, and the plant used the combination of the two flow rates to
estimate the drainage into the pond.

3	N	16	B-10	Q: Type of fly ash handling system is listed as both wet and
dry.  What is the approximate percentage of the time that the fly ash is
handled in a dry fashion?

A:  1.16% of the fly is handled dry and sold: 4,997 tons in 2006.  The
rest of the fly ash is sluiced, and sluicing is continuous 24 hpd, 365
dpy.  The tpd of ash provided in Table 5 includes the fly ash sold and
sluiced.

4	N	18	B-12	Q: The total bottom ash sluice flow rate for Units 1 and 2
is 2,566 gpm in Table 6, whereas it is listed as 2,580 gpm in the
process diagram, 5-1.  Please explain this difference.  Which flow rate
is more accurate?

A:  The Table 6 response is more accurate.

5	N	31	B-21	Q: Why was wastewater generated from the Unit 2 air
pre-heater, but not from the Unit 1 air pre-heater in 2006? 

A: Air pre-heater cleaning was not necessary for Unit 1 in 2006. 
Typically, the air pre-heaters are only washed when the units are
brought down and that typically occurs every three to four years.

 

6	N	38	B-25	Q: CT 1 and CT 2 both used gaseous chlorine in 2006, with
the same average addition amount, but the amount is listed as ppd for CT
1 and gpd for CT 2.  Please confirm that the measurement units should be
ppd for both.

A:  Confirmed.

7	N	38	B-25	Q: No measurement units were provided for the average
addition amount of liquid sodium hypochlorite for CT 2.  Please provide
the measurement units.

A:  gpd.

8	N	43	B-26	Q: Outfalls 01D, 01F-01K, 02, 02D-02K, 03A, 03B, and 04-06
are not listed in Table 14 or the process diagrams.  Did they discharge
in 2006?  03A and 03 B refer to a north and south ash pond.  Does the
plant operate two ash ponds (only one is indicated on the process
diagram and in the wastewater treatment tables)?

A:  See attached table.

The plant operates one large ash pond that has a north and a south end.

9	N	47	B-28	Q: Regarding Diagram 5-1, please confirm that no wastewater
treatment occurs in the Low Volume Waste Basin.

A:  Confirmed.

10	N	47	B-28	Q: For WWT-1 (Diagram 5-1), please confirm that pH
adjustment occurs within (as part of) the ash pond and not within a
separate tank/pond as indicated in the diagram.

A:  pH adjustment occurs in the discharge line from the ash pond to the
retention pond.

11	N	47	B-28	Q: On Diagram 5-1, there is more wastewater shown entering
the ash pond than exiting.  Please confirm that the reason for this is
evaporation.

A:  The reason is a combination of evaporation and rain water entering
the pond.  

12	N	47	B-28	Q: For WWT-2 (Diagram 5-2), please confirm that pH
adjustment and chemical precipitation occur within the settling pond and
not within separate vessels as shown on the diagram?  What chemicals are
typically added for chemical precipitation?

A:  Confirmed.  The plant has added “advanced chemicals” to the
settling pond in the past, but did not add any chemicals in 2006.

13	N	47	B-28	Q: For WWT-3 (Diagram 5-3), is the effluent from the coal
pile runoff pond continuous at 30 gpm or intermittent?

A:  The response for Table 19 is more accurate.

14	N	49	B-32	Q: For WWT-2, does the plant operate two settling ponds
(only one is shown on Diagram 5-2)?  If so, what is the volume and
wastewater residence time in each pond?

A:  The plant operates only one basin for WWT-2 and the wastewater
residence time is indefinite.

15	N	49	B-32	Q: For WWT-3, does the plant operate two settling ponds
(only one is shown on Diagram 5-3)?  If so, what is the volume and
wastewater residence time in each pond?

A:  The plant operates two WWT-3 settling ponds that are identical.  The
volume for each is half of the total volume given in Table 17 (37,000
m3) and the wastewater residence time is 82 hours for each pond.

16	N	51	B-33	Q: For WWT-1, the “Average Dose Concentration” of
sulfuric acid is listed as “Not measured – varies as necessary for
pH”.  As requested in EPA’s email to UWAG on 7/11/07, please provide
the concentration of the active ingredient added (i.e., the amount of
active ingredient contained in the chemical product).

A:  93% sulfuric acid.

17	N	52	B-34	Q: For WWT-1, did FAS, BAS, and PMRS enter the ash pond 24
hpd and 365 dpy?  Was the recycle from the ash pond used for RECYC-FAS,
RECYC-BAS, and RECYC-PMRS 24 hpd and 365 dpy?

A:  Yes.  Yes.