Loading...
HomeMy WebLinkAboutWQ0000956_Final Permit_19910409State of North Carolina Department of Environment, Health, and Natural Resources Division of Environmental Management 512 North Salisbury Street • Raleigh, North Carolina 27611 James G. Martin, Governor William W. Cabey, Jr., Secretary George T. Everett, Ph.D. Director April 9, 1991 Mr. Craig Meadows, City Manager City of Mount Airy Post Office Box 70 Mount Airy, N. C. 27030 Subject: Permit No. WQ0000956 City of Mount Airy Land Application of Sludge Surry County Dear Mr. Meadows: In accordance with your application received on February 21, 1991, we are forwarding herewith Permit No. WQ0000956, dated April 9, 1991, to the City of Mount Airy for the operation of a sludge land application program. This permit shall be effective from the date of issuance until September 30, 1992, and shall be subject to the conditions and limitations as specified therein. Please pay particular attention to the monitoring requirements in this permit. Failure to establish an adequate system for collecting and maintaining the required operational information will result in future compliance problems. If any parts, requirements, or limitations contained in this permit are unacceptable to you, you have the right to request an adjudicatory hearing upon written request within thirty days following receipt of this permit. This request must be in the form of a written petition, conforming to Chapter 150B of North Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this permit shall be final and binding. Pollution Prevention Pays P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone 919-733-7015 An Equal Opportunity Affirmative Action Employer One set of approved documents is being forwarded to you. If you need additional information concerning this matter, please contact Mr. Randy Jones at 9191 733-5083. M cc: Surry County Health Department Environmental Waste Disposal Winston-Salem Regional Office Groundwater Section Tmining and Certification NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES RALEIGH SLUDGE LAND APPLICATION PERMIT In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations PERMISSION IS HEREBY GRANTED TO City of Mount Airy Surry County • 11.1... operation of a sludge land application program consisting of the land application of wastewater treatment plant sludges from the City of Mount Airy's WWTF to the lands which are identified in this permit; this permit includes the addition of various sites in Surry County, the one time land application of sludge from cleaning the aeration basin at the City of Mount Airy's WWTF, with no discharge of wastes to the surface waters, pursuant to the application received on February 21, 1991, and in conformity with the project plan, specifications, and other supporting data subsequently filed and approved by the Department of Environment, Health, and Natural Resources and considered a part of this permit. This permit shall be effective from the date of issuance until September 30, 1992, and shall be subject to the following specified conditions and limitations: I. PERFORMANCE TANDARDS The Winston-Salem Regional Office, phone no. 919/761-2351, and the appropriate local governmental official (county manager/city manager) shall be notified at least twenty-four (24) hours prior to the initial application of the sludge so that an inspection can be made of the application sites and application method. Such notification to the regional supervisor shall be made during the normal office hours from 8:00 a.m. until 5:00 p.m. on Monday through Friday, excluding State Holidays. 2. This permit shall become voidable if the soils fail to adequately absorb the wastes and may be rescinded unless the sites are maintained and operated in a manner which will protect the assigned water quality standards of the surface waters and ground waters. 1 3. The land application program shall be effectively maintained and operated as a non -discharge system to prevent the discharge of any wastes resulting from the operation of this program. 4. The issuance of this permit shall not relieve the Permittee of the responsibility for damages to surface or groundwaters resulting from the operation of this facility. 5. In the event that the land application program is not operated satisfactorily, including the creation of nuisance conditions, the Permittee shall cease applying sludge to the sites and take any immediate corrective actions, including the construction of additional or replacement wastewater treatment or disposal facilities. 6. No crops for direct human consumption shall be raised on these sites for a period of 18 months following sludge application. 7.. Maximum slope for sludge application shall be 10% for surface application and 18% for subsurface applications. 8. The following buffer zones shall be maintained: a) 400 feet from residences under separate ownership for surface application method; however, the buffer zone requirement may be reduced to a minimum of 100 feet upon written consent of the owner, b) 200 feet from residences under separate ownership for injection method; however, the buffer zone requirement may be reduced to a minimum of 100 feet upon written consent of the owner, c) 100 feet from "SA and SB" classified waters and public surface water supplies for both methods, d) 50 feet from "WS" classified waters and other streams, creeks, lakes, rivers, and surface water drainage ways for injection method, e) 100 feet from "WS" classified waters and other streams, creeks, lakes, rivers and surface water drainage ways for surface application method, f) 100 feet from property lines for both methods; however, this requirement may be reduced upon written concurrence from the adjoining property owner, g) 50 feet from public right of ways for surface application methods, h) 25 feet from public right of ways for subsurface disposal methods, i) 10 feet from upslope interceptor drains and surface water diversions for both methods, j) 25 feet from downslope interceptor drains, surface water diversions, groundwater drainage systems and surface drainage ditches for both methods. 9. A copy of this permit shall be kept at the land application site when sludge is being applied during the life of this permit. A spill prevention and control plan shall be kept in all sludge transport and application vehicles. 10. All sludges included in this permit must be stabilized by a process to significantly reduce pathogens (as described in 40 CFR Part 257, Appendix II) prior to application or incorporation. An evaluation of all sludges as specified in condition Il 4 must be conducted as to their ability to demonstrate compliance with this requirement. A copy of this report must be submitted to the Assistant Chief for Operations, Division of Environmental Management, Water Quality Section, Operations Branch, PO Box 27687, Raleigh, NC 27611-7687, within six (6) months of the permit issue date. 2 11. Specific sludge application area boundaries shall be clearly marked on each site prior to and during sludge application. 12. No sludge at any time shall be stored at any application site. H. OPERATION AND MAINTENANCE REQUIREMENTS The facilities and disposal sites shall be properly maintained and operated at all times. 2. A suitable vegetative cover as listed in condition 11 3, shall be maintained in accordance with the crop management plan approved by this Division. 3, The application rates shall not exceed the following for the specified crops: C—ropla PAN (lbs/acre/,year) Corn 200 Fescue 250 4. No sludges other than the following are hereby approved for land application in accordance with this permit: Pennit Estimated Source County Number Volume (dry tons/year) City of Mount Airy Surry NC0021121 575 5. The lifetime heavy metal loadings shall not exceed the following for the corresponding Cation Exchange Capacities (CEC): Parameter CEC < 5 CEC 5-15 Lead (lbs/acre) 500 1000 Zinc (lbs/acre) 250 500 Copper (lbs/acre) 125 250 Nickel (lbs/acre) 125 250 Cadmium (lbs/acre) 4.5 9 6. Upon classification of the facility by the Certification Commission, the Permittee shall employ a certified wastewater treatment plant operator to be in responsible charge of the wastewater treatment facilities. The operator must hold a certificate of the type and grade at least equivalent to the classification assigned to the wastewater treatment facilities by the Certification Commission. 7. Adequate procedures shall be provided to prevent surface runoff from carrying any disposed or stored sludge material into any surface waters. 8. Animals shall not be grazed on sludge applied land within a 30 -day period following the sludge application. Application sites that are to be used for grazing shall have fencing that will be used to prevent access after each application. 9. Surface applied sludge will be plowed or disced within twenty-four (24) hours after application on lands with no cover crop established. 3 10. For areas that are prone to flooding or within the 100 --year flood elevation, sludge may be applied only during periods of dry weather. The sludge must be incorporated into the soil within twenty-four (24) hours of application. 11. Appropriate measures must be taken to control public access to the land application sites during active site use and for the 12 -month period following the last sludge application event. Such controls may include the posting of signs indicating the activities being conducted at each site. 12. Adequate provisions shall be taken to prevent wind erosion and surface runoff from conveying pollutants from the sludge application area onto the adjacent property or into the surface waters. 13. Sludge shall not be applied in inclement weather or until 24 hours following a rainfall event of 1/2 -inch or greater in 24 hours. Any emergency sludge disposal measures must first be approved by the Division of Environmental Management. 14. The site shall be adequately limed to a soil pH of at least 6.5 prior to sludge application. Sludge may be applied to sites with a pH of less than 6.5 provided a sufficient amount of lime is also applied to achieve a final pH of the lime, sludge and soil mixture of at least 6.5. IIT. MONITORING AND REPORTING REQIZIREMENTS Any monitoring (including groundwater, surface water, sludge, soil, or plant tissue analyses) deemed necessary by the Division of Environmental Management to insure protection of the environment will be established and an acceptable sampling and reporting schedule shall be followed. If monitoring data indicates minimal or no concern to the Division, reduction of monitoring requirements may be pursued after two annual reporting periods. 2. Proper records shall be maintained by the Permittee tracking all disposal activities. These records shall include, but are not necessarily limited to the following information: a) source of sludge b) date of sludge application c) location of sludge application (site, field, or zone #) d) method of application e) weather conditions f) soil conditions g) type of crop or crop to be grown on field h) volume of sludge applied in gallons/acre and dry tons/acre i) annual and cumulative totals of dry tons/acre of sludge, annual and cumulative pounds/acre of each heavy metal (which shall include, but not be limited to lead,nickel, cadmium, copper and zinc), annual pounds/acre of piantavailable nitrogen (PAN), and annual pounds/acre of phosphorus applied to each field. 3. A representative annual soils analysis (Standard Soil Fertility Analysis) shall be conducted of each site receiving sludge in the respective calendar year and the results maintained on file by the Permittee for a minimum of five years. The Standard Soil Fertility Analysis shall include, but is not necessarily limited to, the following parameters: 4 % Base Saturation Manganese Magnesium Cation Exchange Capacity Phosphorus Sodium Potassium Nickel Lead Cadmium Zinc Copper pH Calcium 4. A quarterly sludge analysis and annual Toxicity Characteristics Leaching Procedure (TCLP) analysis shall be conducted by the Permittee and the results maintained on file by the Permittee for a minimum of five years. If land application occurs at a frequency less than quarterly, sludge analysis will be required for each instance of land application. The sludge analysis shall include but is not necessarily limited to the following parameters: total solids Magnesium Chlorides Sulfate Phosphorus Potassium Lead Zinc Copper Nickel Cadmium Chromium Sodium Calcium Total Nitrogen Ammonia Nitrogen Nitrate/Nitrite Nitrogen pH Plant Available Nitrogen (by calculation) The TCLP analysis shall include the following parameters: Arsenic Barium Benzene Cadmium Carbon tetrachloride Chlordane Chlorobenzene Chloroform Chromium o -Cresol m -Cresol p -Cresol Cresol 2,4-D 1,4 -Dichlorobenzene 1,2-Dichloroethane 1,1-Dichloroethylene 2,4-Dinitrotoluene Endrin Heptachlor (and its hydroxide) Hexachlorobenzene Hexachloro-1,3-butadiene Hexachioroethane Lead Lindane Mercury Methoxychlor Methyl ethyl ketone Nitrobenzene Pentachlorophenol Pyridine Selenium Silver Tetrachloroethylene Toxaphene Trichloroethylene 2,4,5 -Trichlorophenol 2,4,6 -Trichlorophenol 2,4,5 -TP (Silvex) Vinyl chloride 5. Three copies of all monitoring and reporting requirements as specified in conditions 1111, 1112,1113 and III 4 shall be submitted annually on or before March I of the following year to the following address: 5 NC Division of Environmental Management Water Quality Section Facility Assessment Unit PO Box 27687 Raleigh, NC 27611-7687 6. Noncompliance Notification: The Permittee shall report by telephone to the Winston-Salem Regional Office telephone no. 9191761-2351, as soon as possible, but in no case more than 24 hours or on the next working day following the occurrence or first knowledge of the occurrence of any of the following: a. Any occurrence with the land application program which results in the land application of significant amounts of wastes which are abnormal in quantity or characteristic. b. Any failure of the land application program resulting in a release of sludge material to receiving waters. c. Any time that self-monitoring information indicates that the facility has gone out of compliance with the conditions and limitations of this permit or the parameters on which the system was designed. d. Any process unit failure, due to known or unknown reasons, that render the facility incapable of adequate sludge treatment. e. Any spillage or discharge from a vehicle or piping system transporting sludge to the application site. Persons reporting such occurrences by telephone shall also file a written report in letter form within 15 days following first knowledge of the occurrence. This report must outline the actions taken or proposed to be taken to ensure that the problem does not recur. IV. GROUNDWATER REQUIREMENTS 1. Any groundwater quality monitoring as deemed necessary by the Division of Environmental Management shall be provided. 2. No land application of waste activities shall be undertaken when the seasonal high water table is less than three feet below land surface. 3. The three existing monitoring wells associated with the City of Mount Airy's Site 2 shall be properly abandoned in accordance with 15 NCAC 2C (Well Construction Standards). 6 V. INSPECTIONS 1. The Permittee or his designee shall inspect the sludge storage, transport, and disposal facilities to prevent malfunctions and deterioration, operator errors and discharges which may cause or lead to the release of wastes to the environment, a threat to human health, or a nuisance. The Permittee shall keep an inspection log or summary including at least the date and time of inspection, observations made, and any maintenance, repairs, or corrective actions taken by the Permittee. This log of inspections shall be maintained by the Permittee for a period of three years from the date of the inspection and shall be made available upon request by the Division of Environmental Management or other permitting authority. 2. Any duly authorized officer, employee, or representative of the Division of Environmental Management may, upon presentation of credentials, enter and inspect any property, premises or place on or related to the disposal site and facility at any reasonable time for the purpose of determining compliance with this permit; may inspect or copy any records that must be kept under the terms and conditions of this permit; or may obtain samples of groundwater, surface water, or leachate. VI. GENERAL CONDITIONS 1. This permit shall become voidable unless the land application activities are carried out in accordance with the conditions of this permit and in the manner approved by this Division. 2. This permit is effective only with respect to the nature and volume of wastes described in the application and other supporting data. This permit is not transferable. In the event there is a desire for the facilities to change ownership or a name change of the Permittee, a formal permit request must be submitted to the Division of Environmental Management accompanied by an application fee, documentation from the parties involved, and other supporting materials as may be appropriate. The approval of this request will be considered on its merits and may or may not be approved. 4. Prior to any transfer of this land, a notice shall be given to the new owner that gives full details of the materials applied or incorporated at this site. 5. This permit shall become voidable unless the agreements between the Permittee and the landowners/lessees are in full force and effect. 6. The following are approved sites for sludge application (see attached map): Site No. Qwnuff essee 3 Ernest & Maggie Slate I Ararat Rock Company 2 Ararat Rock Company 3* Ararat Rock Company* 5 Ararat Rock Company 6 Ararat Rock Company 8 Ararat Rock Company 7 At)olication Area (excludinz buffers acres 15 24.85 40.0 19.58 72.02 19.41 28.93 I Otis Johnson 12.4 2 Otis Johnson 21.0 3 Otis Johnson 27.4 4 Otis Johnson 17.1 5 Otis Johnson 22.0 1 Tony Holder 20.2 2 Tony Holder 21.1 3 Tony Holder 5.6 1 Buddy Joe Gentry 27.4 1 Robert Richards 15.2 2 Robert Richards 11.8 3 Robert Richards 30.4 2 Jimmy Johnson 30.6 3 Jimmy Johnson 13.1 1 Bernie Johnson 27.5 Total 522.9 *Sludge application is restricted to the knoll area of this site. The Richard Roberts Site 4 has not been approved for sludge application due to the potential for flooding. 7. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to an enforcement action by the Division of Environmental Management in accordance with North Carolina General Statute 143-215.6. &. The annual administering and compliance fee must be paid by the Permittee within thirty (30) days after being billed by the Division. Failure to pay the fee accordingly may cause the Division to initiate action to revolve this permit as specified by 15 NCAC 2H.0205 (c)(4). 9. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances which may be imposed by other government agencies (local, state, and federal) which have jurisdiction. 10. A set of approved documents for the subject project must be retained by the applicant for the life of the permit. 11. The Permittee, at least six (6) months prior to the expiration of this permit, shall request its. extension. Upon receipt of the request, the Commission will review the adequacy of the facilities described therein, and if warranted, will extend the permit for such period of time and under such conditions and limitations as it may deem appropriate. 12. This permit may be modified, or revoked and reissued to incorporate any conditions, limitations and monitoring requirements the Division of Environmental Management deems necessary in order to adequately protect the environment and public health. 13. Prior to land application, the aeration basin sludge shall be conditioned to adjust the sodium adsorption ratio of the sludge to less than ten (10). 14. After the fields have been flagged and prior to sludge application, the Winston-Salem Regional Office shall be notified. Permit issued this the 9th day of April, 1991. N TH CAROLINA E IRONMENTAL MANAGEMENT COMMISSION George T. Evere , Division of Environmental agement By Authority of the Environmental Management Commission Permit No. WQ0000956 X (MISCELLANBOUS UNITS CONTINUED) POINTS (c) Molding Pond for Effluent Flow Equalization and/or Stage Discharge . . . . . . . . . . . . . . . . . . 5 d Effluent Pumps . . • 3 e In -Plant Pumps (including atr lifts). . . . . . . . 2 f Stand -&y Power Supply . . , . . . • • - • 3 g Therzal Pollution Control Dcvice . . 3 h Treatment Processes for Removal of Metal or Cyanide and other Toxic Materials . . . . . . 30 Total Points L CLASSIFICATION Class 1 5 _ 25 Points I 26 50 Points Class III . . . . . . . . . 51 - 65 Points Class IV . . . . . . . . . . . . . 66 - Up Points Facilities having a rating of one through four points, inclusive, do not require a certified operator. Classification of all other facilities requires a comparable grade operator in responsible charge. -4- North Carolina Division of Environmental Management Checklist of Facility Components To be Used In Determing Facility Classification All information will be printed: Q Name of Plant C �Y o_r / ' c" County Owner or Contact Person ci Q �Te�1e Rinne Mailing Address?- o 7a Izp �� 30 Street or P.O. Box No. Town or City Zip Permit Number Information Construction State,, NPDES Permit No. Please Checi: Existing Facility Date Issued Upgraded Facility /0New Facility State Permit No. 111 7c'�p / p a if Upgraded or New—Fac-iIity, Give 50% Completion bate Date Issued--�� 100% Completion Date Rated by ?. Regional Office 5EEG Date4-iib -IF/ Operator in Responsible Charge Design Flow of Plant in GPD Plant Class de I194 PO I HTS (1) PRETREATMENT UNITS (see definition No, 34) . . . . . . . . 2 2 DESIGN FLOW OF PLANT IN GPD (not applicable to non - contaminated tooling waters and non -discharging systems) 0 -- 20,000 . . . . . . . . . . . . . . . . . . 1 20.001 - 50.000 . . . . . . . . . . . . . . . . . . 2 50,001 -- IOO,D00 . . . . . . . . . . . . . . . . . . 3 100,001 -- 250,000 . . . . . . . . . . . . . . . . 4 250,001 -- 5001000 . . . . . . . . . . . . . . . 1 5 SOO,D01 -- 11000.DOO . . . . . . . . . . . . . . . . e 11000 001 -- 2,000,000 . . . . 10 2,000,001 (and up) - rate l point additional for each 200,000 GPD capacity up to a maxiraue of . . . 30 Design Flow (GPO): (3) PRELIMINARY UNITS (see definition No. . . . . . . . .. .a (a]Influent Pumps (including air lift) . 3 (b Bar Screens • • • • • • . • 1 or (c) Mechanical Screens, Static Screens or Coaminuting Devices . . . . . . . . . . . 2 (d) Grit Removal or . . . I e MechanlCal or Aerated Grit Removal 2 f Flow Measuring Device or . . . . . . . . . . . . . . I (g) Instrumented Flow Measurement . . . . . . . . . , . 2 Effective ]/1183 .i- (4) (5) (6) ITEM POINTS Mih Preaeration or Equalization . . . . . . . . . , I POINTS Grease or Oil Separators -- Gravity . . . . . . . , 2 Land Application (see definition No. 23b) Mechanical. . . . . . . 3 Aerated . . . . . . . . 5 (j} Chemical Conditioning . . . . . . . . . . . . . . . 5 PRIMARY TREATMENT UNITS kjj Phosphorus Removal . , Septic Tank (see definition No. 44) , . , . . . . . 2 b 141 Imhoff Tank , , 3 c Primary Clarifiers (including sludge air lifts) 5 d Settling Pouds or Settling Tanks for Inorganic Non - (m) Post Aeration - Cascade , , , , , , Toxic Materials Involving a Discharge to the Surface waters (sand, gravel, stone, and other mining operations 5 except recreational activities such as gem or gold Pre -Package Unit for Removal of oil and Grease . , 30 mining) . . . . . . . . . . . . . . .. 10 SECONDARY TREATMENT UNITS 5 (a) Carbonaceous Stage Sand or Mixed -Media Filters -- low Rate . . . . , (i) Aeration - High Purity Oxygen System 20 High Rate . . . , . Diffused Air System . . .. . . . . . . 10 SLUDGE TREATMENT Mechanical Air System (fixed, floating or rotor) $ (a) Separate Sludge Reaeration . , . . . . . 3 (ii) Trickling Filter - High Rate . . . . . . . . 7 5 Standard Rate . . . . . . 5 Unheated Packed Tower . , . . . . . 5 b) Aerated Lagoons , , 10 (iv Rotating Biological Contactors (biodisc). . . 10 2 (v Sand Filters (intermittent biological) . . . 2 Sludge Elutriation , . . . . . . . . . . . (vi Stabilization Lagoons with Outlet to Stream 5 e) (vii Clarifier (including sludge air lifts), 5 (b) Nitrogenous Stage Sludge Thickener , . . , - . , , , 2 (i) Aeration - High Purity Oxygen System. 20 Sludge Gas Utilization (including gas storage). . . Diffused Air Systems. . . . . . . . . 10 (h Mechanical Air System (fixed, floating, or rotor)$ 5 Separate Sludge Reaeration . . . . . . . . . 3 Non-aerated (ii) Trickling Filter - High Rate . . . . . . . . 7 (1) Standard Rate . . . . . . 5 Packed Tower. , . 5 10 10 (iii} Rotating Biological Contactors (biodisc) , . 10 (iv Sand Filter (intermittent biological). . . . 2 Lagoons (v Clarifier (including sludge air lifts) . . . 5 TERTIARY OR ADVANCED TREATMENT UNITS (a) Activated Carbon Beds - Without Carbon regeneration 5 With Carbon regeneration. 15 {b) Powdered or Granular Activated Carbon Feed - Without a Carbon regeneration S With Carbon regeneration. 15 c) Ammonia Stripping 1$ d) Chemical Additions _ 5 e) Denitrification Process (separate process), . . . 10 f) Electrodialysis 5 g) Foam Separation . . . . . . . . . . 5 (h) Ion Exchange. . . . . . . . . . . . . . . . . . . 5 -2- ITEM POINTS (i) Land Application (see definition No. 23b) 5 (not applicable for facilities under 10(a) . . , J) Microscreens 5 kjj Phosphorus Removal . , Y0 1) Polishing Ponds- Without aeration . , . , . , . . 2 With aeration5 (m) Post Aeration - Cascade , , , , , , 0 Diffused or Mechanical , . . , . . 5 n) Pre -Package Unit for Removal of oil and Grease . , 30 o) Reverse Osmosis , , , , , , 5 (p) Sand or Mixed -Media Filters -- low Rate . . . . , High Rate . . . , . 5 (7} SLUDGE TREATMENT (a) Sludge Digestion Tank -- Heated . . . . . . , . . . 10 Aerobic . . . . . . . . . 5 Unheated 3 b) Sludge Stabilization (chemical or thermal) . . , . 10 C} Sludge Drying Beds . . , . . . . 2 d) Sludge Elutriation , . . . . . . . . . . . 5 e) Sludge Conditioner (chemical or thermal) . . . . . 5 f) Sludge Thickener , . . , - . , , , 2 (g) Sludge Gas Utilization (including gas storage). . . 2 (h Sludge Holding Tank -- Aerated 5 Non-aerated 2 (1) Sludge Incinerator (not inciudin9 activated carbon (J) regeneration} . . . . . , , , Vacuum Filter. Centrifuge or Filter Press . 10 10 (B) . . . SLUDGE DISPOSAL (including incinerated ash) a Lagoons 2 b Land Application (2uuaf-re and subsurface) (see def. (c) Landfilled (9) DISINFECTION (burial) . a Pre 1 bIntermediate . . . . . . . . . . . . . . . . . . 2, Post . . . . . . • 3 lc) d Dechlorination. . . . . . . , . . . . . . . 5 e Chlorine or Ozone Generation. . . . . . . . 5 f) Radiation , , . . 3 (10) MISCELLANEOUS UNITS (a) Holding Ponds or Holding Tanks for Inorganic, Non-toxic Materials with no Discharge to the Surface Waters 2 (Sludge handling facilities for water purification plants, sand, gravel, crushed stone and other similar operations --see definition No. 10) (b) Holding Ponds or Holding Tanks for Organic or Toxic Materials with no Discharge to the surface slaters 4 (Any pump, valve, or other mechanical control subject to failure creating a potential for bypass or discharge from the holding ponds or tanks will necessitate a minimum classification of Class I requiring a certified operator). -3-