EPA Form 6700-04

OMB Control No. 20XX-XXXX 

Approval expires XX/XX/XX 

The public reporting and record keeping burden for this collection of information is estimated to average 30 minutes per 

response. Send comments on the Agency's need for this information, the accuracy of the provided burden estimates, and any suggested 

methods for minimizing respondent burden, including through the use of automated collection techniques to the Director, Collection Strategies 

Division, U.S. Environmental Protection Agency (2822T), 1200 Pennsylvania Ave., NW, Washington, D.C. 20460. Include the OMB control 

number in any correspondence. Do not send the completed form to this address.

*Please Note: This is a complete list of the questions found in this survey. Depending on how the 

respondent answers the subsequent questions asked will vary.

Data Tracking Form for Water Resource Recovery Facilities (WRRFs) Co-Digesting Food-based 

Materials

Project/Facility Information

1. Please provide the following information about your Project/Facility.

Project/Facility Name

Street address

City/Town

State

Zip code

Phone Number

2. Please provide the following information for the contact person for facility operations

Name

Title

Email Address

Phone number

3. Please provide the contact address (if different from Facility Address)

Street address

City/Town

State

Zip code

Organic Waste Processing

4. In addition to wastewater solids, is organic waste accepted and processed in your anaerobic 

digesters (practice of co-digestion)?

5. If organic waste is currently not accepted at your anaerobic digesters, is your facility planning for 

or interested in receiving organic wastes from offsite?

Facility operating status:

6. Please identify the status of your facility

a. Planning stage/Design stage/Permitting process 

b. Co-digestion system under construction
EPA Form 6700-04

c. Operational

d. Temporary shut-down

e. Ceased operation

f. Other

7. What is the targeted date for your co-digestion system to be operational?

8. What date did your co-digestion system become operational?

9. What date did your co-digestion system temporarily shut-down?

10. What is the targeted date for your co-digestion system to re-start operations?

11. What date did your co-digestion system cease operations?

12. Please state the reason your co-digestion system ceased operations.

WRRF Digestion Capacity

13. How many digesters do you have?

14. What shape are your digesters?

15. What is the solids content (%) in the wastewater solids feed stream going to your digester(s)?

16. Please identify the total capacity of all your digesters combined for wastewater solids from your 

collection system and feedstocks from other offsite sources. Please provide answer in gallons.

17. What is the flow of your WRRF (as designed)? Please provide answer in MGD.

18. What is the permitted flow of your WRRF (if different from designed flow)? Please provide 

answer in MGD.

19. What is the average dry weather flow? Please provide answer in MGD.

20. Please identify your facility’s available capacity to accept feedstocks from offsite sources for all 

digesters combined. When calculating this available capacity, please take into account the 

average volume of wastewater solids processed at your facility and conveyed to your plant via 

your collection system.

21. Please indicate if this available capacity for processing feedstocks other than wastewater solids 

is provided in gallons per year or tons per year.
EPA Form 6700-04

22. Please briefly describe how you calculated the available capacity to accept feedstocks from 

offsite sources.

23. What is the average percent solids accepted from offsite sources of feedstock?

WRRF Co-Digestion Capacity

24. Please identify the number of months during the year 2015 that your co-digestion system 

received and processed feedstocks (other than wastewater solids) from offsite sources.

25. Please indicate how organic feedstocks from offsite sources are handled upon receipt at your 

facility.

a. Fed into a separate digester

b. Combined with wastewater solids

c. Other (please specify)

26. Does your facility accept and process food-based feedstocks?

27. What was the total volume of food-based materials received in liquid form and processed in the 

co-digestion system at your facility during the 2015 calendar year? Please express your answer 

in gallons.

28. What was the total weight of food-based materials received in solid form and processed in the 

co-digestion system at your facility during the 2015 calendar year? Please express your answer 

in tons.

29. Does your facility accept and process non-food-based feedstocks?

30. What was the total volume of non-food-based materials received in liquid form and processed in 

the co-digestion system at your facility during the 2015 calendar year? Please express your 

answer in gallons.

31. What was the total weight of non-food-based materials received in solid form and processed in 

the co-digestion system at your facility during the 2015 calendar year? Please express your 

answer in tons.

Types of Feedstocks

32. Please identify the specific types of feedstocks that are received from offsite sources and 

processed in the co-digestion system at your WRRF. Check all that apply.

a. Beverage processing industry waste 

b. Crop residues 

c. Crude glycerine 

d. De-icing fluid 

e. Fats, oils and greases (FOG) 

f. Food processing industry waste

g. Food service waste, pre & post-consumer 
EPA Form 6700-04

h. Fruit/vegetative wastes 

i. Lab (or Pharma) wastes

j. Litters 

k. Manures 

l. Mixed yard waste

m. Paper mill wastes 

n. Rendering wastes 

o. Retail food waste 

p. Septage 

q. Source-separated commercial, institutional or residential organic wastes 

r. Wastewater solids (sludge) from other WRRFs

s. Other (please specify) 

33. Are your tipping fees equal for all materials?

34. Which of the following ranges best represents your tipping fees for co-digesting liquid 

feedstocks?

a. N/A – Facility does not process liquid feedstock. 

b. Business Confidential/Prefer not to say 

c. $0.00-$0.05 per gallon

d. $0.06-$0.10 per gallon 

e. $0.11-$0.20 per gallon

f. $0.21-$0.50 per gallon 

g. $0.51-$1 per gallon 

h. > $1 per gallon 

35. Which of the following ranges best represents your tipping fees for co-digesting solid 

feedstocks?

a. N/A – Facility does not process solid feedstock. 

b. Business Confidential/Prefer not to say 

c. $0-$10 per ton

d. $11-$20 per ton 

e. $21-$30 per ton 

f. $31-$40 per ton 

g. $41-$50 per ton 

h. $51-$60 per ton

i. $61-$70 per ton 

j. $71 or more per ton 

36. You indicated that you receive and co-digest the feedstocks identified below. The feedstocks 

identified in your answer to question 32 above will be listed on this page. Please indicate 

whether these feedstocks are in liquid form (with tipping fees in dollars per gallon) or solid form 

(with tipping fees in dollars per ton) or both?
EPA Form 6700-04

37. You indicated that you receive and co-digest the feedstocks identified below in liquid form. The 

feedstocks identified in your answer to question 32 above will be listed on this page. Which of 

the following ranges best represents your tipping fee for these liquid feedstocks? 

a. Prefer not to say 

b. $0.00-$0.05 per gallon

c. $0.06-$0.10 per gallon 

d. $0.11-$0.20 per gallon

e. $0.21-$0.50 per gallon 

f. $0.51-$1 per gallon 

g. > $1 per gallon 

38. You indicated that you receive and co-digest the feedstocks identified below in solid form. The 

feedstocks identified in your answer to question 32 above will be listed on this page. Which of 

the following ranges best represents your tipping fee for these solid feedstocks?

a. Prefer not to say 

b. $0-$10 per ton

c. $11-$20 per ton 

d. $21-$30 per ton 

e. $31-$40 per ton 

f. $41-$50 per ton 

g. $51-$60 per ton

h. $61-$70 per ton 

i. $71 or more per ton

39. Please identify the sources of the feedstocks that are received and processed in the co-digestion 

system at your facility. Check all that apply.

a. Airports

b. Biodiesel production

c. Corporate complexes

d. Farmers Markets

e. Food/Beverage Processors

f. Fruit/Vegetable Farms

g. Grocery Stores/Supermarkets

h. Healthcare 

i. Hospitality

j. Industrial

k. Laboratories/Pharmaceutical Companies

l. Livestock Farms

m. Municipal/Residential

n. Prisons

o. Restaurants and Food Service

p. Retail Stores

q. Schools

r. Sports and Entertainment Venues
EPA Form 6700-04

s. Other Wastewater Treatment Plants

t. Other (please specify)

40. Please describe any pre-processing/de-packaging that is required before feedstocks from offsite 

sources are fed into the co-digestion system at your facility. Pre-processing may be conducted 

by a third-party. If that is the case, please state that in the space provided below.

41. Please identify the following specifications for your digester.

a. Temperature range

b. Batch or continuous

c. Number of stages

42. How would you describe your digester? Check all that apply.

a. Continuous Stirred Tank Reactor

b. Temperature-phased (TPAD)

c. Acid-gas Phase

d. Plug Flow

e. Complete Mix

f. Other (please specify)

Product End-Uses

43. Please provide the average biogas production volume at your facility during calendar year 2015 

in one of the units identified below. 

a. SCFM

b. SCFD

c. SCFY

d. Other

44. Is the biogas produced at this facility used onsite, sold or flared?

45. Are the post digestion biosolids Class A or Class B?

46. Please identify how the biogas produced in your digesters is used. It could be used onsite by the 

WRRF or offsite by a purchaser. Check all that apply.

a. Produce mechanical power 

b. Produce heat and electricity (CHP) 

c. Produce electricity (including net metering) 

d. Produce electricity (sold to grid) 

e. Fuel boilers and furnaces to heat digesters 

f. Fuel boilers and furnaces to heat other spaces 

g. Compressed to vehicle fuels: used for company fleet/personal vehicles 

h. Compressed to vehicle fuels: sold to customers 

i. Renewable natural gas (processed in order to inject to pipeline) 

j. Other (please specify) 
EPA Form 6700-04

47. Are you able to utilize all of the biogas produced in the digesters at this WRRF?

48. Do you flare the excess biogas?

49. Do you have a gas purification system?

50. What type of gas purification system do you have?

51. What is removed by your gas purification system? Check all that apply.

a. Moisture

b. Sulfur

c. Siloxanes

d. Carbon Dioxide

e. Compressed Gas

f. Other (please specify)

52. Do you beneficially re-use the post-digestion derived biosolids produced in your co-digestion 

system? (Select all that apply)

a. Yes, de-watered/dried and land applied

b. Yes, land applied as is with no dewatering or drying

c. Yes, composted into a reusable or salable product

d. Yes, processed into other salable products (e.g., flower pots)

e. No, landfilled

f. No, incinerated

g. Other (please specify)

53. If any post-digestion derived biosolids were disposed of in landfills or incinerated in 2015, please 

specify the amount in tons or gallons (if known).

54. Is the de-watered/dried digestate further treated prior to land application?

55. Please indicate what the further treatment is and why it is necessary.

56. How do you manage the liquid digestate you produce? Check all that apply.

a. Beneficially reused as fertilizer via land application

b. Recirculated through digester

c. Other (please specify)

57. Is the liquid digestate further treated prior to land application?

58. Please indicate what the further treatment is and why it is necessary.
EPA Form 6700-04

59. Do you recover nutrients from your digestate?

a. No

b. Yes, phosphorous recovery by chemical precipitation (e.g., struvite)

c. Yes, ammonia recovery

d. Other (please specify)