# OMB Control Number: 2040-0281 Plant ID: Insert Plant I D

Approval Expires: 05/31/2013 Plant Name: Insert Plant N ame

Section Title Tab Name

Part G Instructions

Part G Section 1

Part G Section 2

Part G Section 3

Part G Section 4

Part G Section 5

Part G Sampling Results

Part G Comments Landfills Table of Contents

Leachate Collection

Part G Comments Leachate Sample Collection Instructions

Sample Collection Information

Laboratory Analytical Data Form Waste Information Steam Electric Questionnaire

PART G - LEACHATE SAMPLING DATA FOR PONDS/IMPOUNDME NTS AND LANDFILLS

Part G Instructions

Leachate Generated from Ponds/Impoundments and

Approved: May 20, 2010

# Steam Electric Questionnaire Part G. Instructions



# Plant ID: Insert Plant ID

Plant Name: Insert Plant Name

PART G. LEACHATE SAMPLING DATA FOR PONDS/IMPOUNDMEN TS AND

LANDFILLS

Use the Part G Comments tab to do the following: prov ide additional information as

requested in certain questions within Part G; indicate a typical data (e.g., if the analytical

data provided from the sample collection is not represen tative of normal operations);

and note methods used to make best engineering estimates in the event that exact data

are not available. INSTRUCTIONS

Complete Part G of the questionnaire for your plant. As you are completing the

electronic form, note the following: When you enter y our plant name and plant ID on the

Part G TOC tab, all name and ID fields throughout Pa rt G will automatically populate.

Refer to the overall questionnaire instructions, the gl ossary, and the acronym list for

assistance with completing Part G.

Please provide all free response answers in the highligh ted yellow areas. Throughout

Part G, you may need to make copies of certain sections/qu estions. Instructions are

provided throughout Part G regarding making copies. No te that pond/impoundment unit

and landfill names must be populated on the copied tab or section, located in the upper

right corner under "Plant ID" and "Plant Name", in o rder to correlate the requested

information with the pond/impoundment or landfill.

Sampling data and the completed Part G of the quest ionnaire shall be submitted

to EPA no later than 120 calendar days after receiv ing the questionnaire.

A company or plant may be exempt from the leachate sam ple collection (Question G3-

1). Please refer to Question G1-1 and the "Applicabil ity" section located in the "Part G

Section 3" tab to determine if you are exempt and ho w to submit a written explanation.

Approved: May 20, 2010Steam Electric QuestionnairePart G. Leachate Sampling Data for Ponds/Impoundmentsand LandfillsPart:GSection Title:Instructions:CBI? G1-1.(Skip to next Questionnaire Part)1. Leachate CollectionPart G requestsleachatesampling data forpond/impoundmentunits andlandfillsused for the storage, treatment, and/ordisposal ofresiduesor by-products (orsludgesor water streams containing the residues or by-products) from thecombustion of coal or petroleum coke, including, but not limited to,fly ash,bottom ash, boiler slag, or flue gasdesulfurization (FGD) system residues. This includes liquid-borne material and solid material.Insert Plant IDInsert Plant NamePlant ID:Plant Name:(Skip to Section 2)Note: This includes landfills located on non-adjoining property that are under the operational controlof the plant. This alsoincludes landfills, within 20 miles, owned/operatedby the plant's ultimate parent firm, for the purpose of storing/disposing ofprocess wastewaters, residues or by-products, fromthe plant.Isleachatecurrently collected from anypond/impoundmentand/orlandfill, including those located on non-adjoiningproperty, that contains residues or by-products from the combustion of coal or petroleum coke? Pleasesee the glossary for acomplete definition ofleachate, which includes the terms seepage, leak, and leakage.YesNoYesG-1Approved: May 20, 2010Steam Electric QuestionnairePart G. Leachate Sampling Data for Ponds/Impoundments and LandfillsPart:GSection Title:Instructions:CBI? G2-1.CBI? G2-2.Insert Plant IDInsert Plant NameInsert IDPlant ID:Plant Name:Pond/Impoundment Unit or Landfill ID:2. Leachate Generated from Ponds/Impoundments and Landfills(Continue)Is all collected leachate transported off site for treatment and/or disposal?Make copies of Section 2 (Questions G2-1 through G2-4) for eachpond/impoundmentunit andlandfill, including those located on non-adjoiningproperty, used for the storage, treatment, and/or disposal ofresiduesor by-products (orsludgesor water streams containing the residues or byproducts) from the combustion of coal or petroleum coke,including, but not limited to,fly ash,bottom ash, boiler slag, or flue gas desulfurization(FGD) system residues. This includes liquid-borne material and solid material. Enter the pond/impoundment unit or landfill ID in the space providedabove (use pond/impoundment unit and landfill IDs assigned in Table A-4 and Table A-6). Please provide all free response answers in thehighlighted yellow areas.Note: This includes landfills located on non-adjoining property that are under the operational control of the plant. This also includes landfills, within20 miles, owned/operated by the plant's ultimate parent firm, for the purpose of storing/disposing of process wastewaters, residues or by-products,from the plant.(Continue)(Skip to Section 3. Provide ONLY untreated monitoring data as described in Question G3-1.)(Skip to Section 5)Isleachatecurrently collected from this pond/impoundment unit orlandfill (excluding leachate returned to the pond/impoundment from which itoriginated)?Note: "Treatment" refers to the removal of specific pollutants or process wastewater constituents other than suspended solids. Refer to Figure G-1below to help determine the leachate sample collectionrequirements for this pond/impoundment or landfill.Make a copy of Section 2 for each pond/impoundment unit and landfill, including those located on non-adjoining property, using the "Copy Section 2"button below.YesNoYesNoYesYesCopy Section 2G-2Approved: May 20, 2010Steam Electric QuestionnairePart G. Leachate Sampling Data for Ponds/Impoundments and LandfillsCBI? G2-3.CBI? G2-4.(Provide ONLY untreatedmonitoring data as described in Question G3-1)(Continue)(Skip to Section 3. Provide ONLY untreated monitoring data as described in Question G3-1.)Is the leachate combined with other waste streams prior to treatment?(Provide treatedand untreatedmonitoring data as described in Question G3-1)(Provide treatedand untreatedmonitoring data as described in Question G3-1)Is the collected leachate from this pond/impoundment unit or landfill that is not transferred off site currently treated?YesYesNoYesYes, combined with ONLY runoff or other stormwaterYes, combined with process wastewater other than runoff/stormwaterNoG-3Approved: May 20, 2010Steam Electric QuestionnairePart G. Leachate Sampling Data for Ponds/Impoundments and LandfillsFigure G-1. Leachate Collection Decision TreeG-4Approved: May 20, 2010Steam Electric QuestionnairePart G. Leachate Sampling Data for Ponds/Impoundmentsand LandfillsPart:GSection Title:G3-1.Plant ID:Plant Name:Insert Plant IDInsert Plant Name3. Leachate Sample Collection InstructionsOVERVIEW OF THE SAMPLE COLLECTIONThe samples should be collected as detailed in these instructions. In general, samples should be collected as grab samples (i.e.,composite samples arenot required). The plant should collect samples from each leachate collection point for each pond/impoundmentand landfill. If the plant determines that a samplefrom one or more collection points are representative ofan individualpond/impoundment or landfill, then the plant may simply collect the representative sample(s). The plant should collect samples fromeach sampling location once per week for four consecutive weeks, or as soon thereafter as sufficient leachate is available for collection.Sampling data and the completed Part G of the questionnaire shall be submitted to EPA no later than 120 calendar days afterreceiving the questionnaire.Collect process wastewater samples of untreatedand/or treatedleachatestreams generated frompond(s)/impoundment(s)andlandfill(s)used for the storage, treatment, or disposal ofresiduesor by-products (orsludgesor water streams containing the residuesor by-products) from the combustion of coal or petroleumcoke, including, but not limited to,fly ash,bottom ash, boiler slag, or flue gasdesulfurization (FGD) system residues (this includes liquid-borne material and solid material).G-5Approved: May 20, 2010Steam Electric QuestionnairePart G. Leachate Sampling Data for Ponds/Impoundmentsand Landfills• Metals (total recoverable; antimony,arsenic, beryllium, cadmium,chromium, cobalt, copper, lead,manganese, molybdenum, nickel,selenium, silver, thallium, vanadium,and zinc)EPA Method 200.8• Metals (total recoverable: aluminum,barium, boron, calcium, iron,magnesium, sodium, tin, and titanium)EPA Method 200.7 or 200.8• Mercury EPA Method 1631E• Chlorides 40 CFR Part 136-approved• Sulfates 40 CFR Part 136-approved• Total dissolved solids (TDS) 40 CFR Part 136-approved• Total suspended solids (TSS) 40 CFR Part 136-approved• pH 40 CFR Part 136-approved• Must have data from leachate generated from each pond/impoundment and landfill where leachate is collected;• Must have at least four samples of untreatedand/or treatedleachate, where each sample is collected at least fivedays apart; and• Must have tested for every analyte listed above using the specified analytical methods.The following analytes and analytical methods must be used for the sample analysis:2. The plant personnel are unable to collect the samples safely.Each company or plant is responsible for identifying andcontracting an analytical laboratory to perform the analyses.A plant may be exempt from the leachate sample collection (and skip to Question G3-2) if one of these two circumstances is true:1. The plant can provide previously collected leachate characterization data if it fulfills the following data requirements:APPLICABILITYG-6Approved: May 20, 2010Steam Electric QuestionnairePart G. Leachate Sampling Data for Ponds/Impoundmentsand LandfillsJezebele AliceaUS EPAEngineering and Analysis DivisionMail Code: 4303T1200 Pennsylvania Avenue, N.W.Washington, DC 20460alicea.jezebele@epa.govSAMPLE LOCATIONCollect untreatedand/or treatedleachate samples from each pond/impoundment unit and landfill for which you responded "yes" inQuestion G2-1.If the pond/impoundment unit and/or landfill has multiple collection points, the untreatedsample may be collected from a commonheader area, if applicable. If there is not a commonheader area for the pond/impoundment or landfill, the plant may select one of thecollection points that is "representative" of the pond/impoundment or landfill from which to collect the sample.If warranted due to thecharacteristics of the pond/impoundment or landfill, theplant may need to collect samples from more than one collection point to obtainrepresentative samples. If the plant collects the samples from one ”representative” collection point, describe how the company or plantdetermined the collection point is “representative” of all of the collection points in the “Part G Comments” tab located at the end of PartG.If you believe you are exempt, you must submit a written explanation justifying one or both of these two circumstances withintwo weeks after receiving the questionnaire by e-mail (preferred) or mailed to:EPA will then determine if the plant is exempt from the leachate sample collection requirement. If the plant can provide previouslycollected leachate characterization data, then the plantshould complete Section 4 (Questions G4-1 and G4-2) andcontinue to Section5 (Question G5-1). Also, the plant must provide the leachate sampling data in Table G-4 found in the "PartG Sampling Results" tab. Ifthe plant cannot collect the samples safely, then the plant should skip Section 4 and continue to Section 5 (Question G5-1).The untreatedleachate samples must be collected directly from theleachate collection systemor holding tank prior to any form oftreatment. The treatedleachate samples must be collected from the effluent from a leachate treatment system that is designed for thepurpose of removing pollutants or process wastewater constituents, other than suspended solids, prior todischargeor comminglingwith other process wastewaters.G-7Approved: May 20, 2010Steam Electric QuestionnairePart G. Leachate Sampling Data for Ponds/Impoundmentsand LandfillsCBI? G3-2.CBI? G3-3.SAMPLE FREQUENCYCollect one sample of untreatedleachate (and one sample of treatedleachate if appropriately identified by responses in Question G2-4) once per week for four weeks, or as soon thereafter assufficient leachate is available for collection, from eachpond/impoundmentunit and landfill. Please note that the samples must be collected at least five days after the previous sample was collected. If thepond/impoundment or landfill does not generate leachate weekly, please collect the samples as soon as the leachateis generated, butallow at least five days between samples.Please attach an aerial photograph or drawing showingthe entire waste management unit (i.e., pond/impoundment unit or landfill) thatshows the boundaries and identifies all leachate collection points and the active and inactive areas of the pond/impoundment or landfill.Also, indicate the leachate sample location(s) used for this sample collection in the aerial photograph or drawing of thepond/impoundment unit or landfill.Please identify the leachate sample locations used for this sample collection in the block diagram previously requested in Question F4-2.QUALITY ASSURANCE/QUALITY CONTROLExample 2: If a plant collects both untreatedand treatedleachate from both a pond/impoundment unit and a landfill, and eachseparately has a single leachate collection point and they have separate treatment systems, the plant is requiredto collect atotal of sixteen samples.Follow the method-specified quality assurance/quality control analyses and attach a data review summary once the analyses arecomplete.SAMPLE ANALYSESAfter receiving the analytical results from the laboratory, enter the analytical data into the “Part G Sampling Results” tab. Report allresults, including those below the reporting limit. Identify results that are less than themethod detection limit(MDL), and results thatare between the detection andreporting limits. For example, if the MDL is equal to 5 ng/L, the reporting limit is equal to 15 ng/L, andthe value reported by the laboratory is 12 ng/L, report 12 ng/L as the measured value and identify and describe any qualifiers on thedata in the corresponding column. If the measured valueis not detected, list the detection limit value and selectthe less than (<) symbolin the non-detect indicator column.Example1: If a plant collects only untreatedleachate from a pond/impoundment unit, and the samples are obtained from asingle leachate collection point, the plant is requiredto collect a total of four samples.YesYesI have attached the aerial photographI did not attach the aerial photograph. Explain why:Leachate sampling collection locations identified on the block diagram requested in Part F, Question F4-2.G-8Approved: May 20, 2010Steam Electric QuestionnairePart G. Leachate Sampling Data for Ponds/Impoundments and LandfillsPlant ID: Insert Plant IDPlant Name: Insert Plant NamePart:GSection Title:Instructions:G4-1.Pond/ImpoundmentUnit or Landfill ID(Use IDs from TablesA-4 and A-6)Sample CollectionLocation DescriptionDate of SampleCollection(mm/dd/yyyy)Leachate Treatment System ID:CBI?Leachate Treatment System ID:CBI?Leachate Treatment System ID:CBI?Leachate Treatment System ID:CBI?Leachate Treatment System ID:Common header areaTable G-1. Sample Collection InformationIn Table G-1, provide a description of the sample collection location, the date the sample was collected, the flow rate of the leachatestream from the collection point (select the unitsof the flow rate), and identify if the leachate stream is treatedor untreated. If theleachate sample is treated, provide the leachate treatment system ID previously identified in Table F-5.Sample Collection Location01/25/10ExampleComplete Table G-1 for eachpond/impoundmentunit andlandfillthat requiresleachatesampling and is used for the storage, treatment,and/or disposal ofresiduesor by-products (orsludgesor water streams containing the residues or by-products) from the combustion ofcoal or petroleum coke, including, but not limitedto,fly ash,bottom ash, boiler slag, or flue gas desulfurization (FGD) system residues.This includes liquid-borne material and solid material. Enter the pond/impoundment unit or landfill ID in the first column of Table G-1(use pond/impoundment unit and landfill IDs assigned in Table A-4 and Table A-6). Please provide allfree response answers in thehighlighted yellow areas.Collect daily rainfall data starting two weeks prior to collection of the first sample through the dayof the last sample collected and enterthe date and inches of rainfall in Table G-2.4. Sample Collection InformationYesYesYesYesUntreated pond/impoundmentSample Collection LocationSample Collection LocationSample Collection LocationSample Collection LocationG-9Approved: May 20, 2010Steam Electric QuestionnairePart G. Leachate Sampling Data for Ponds/Impoundments and LandfillsCBI? G4-2.Date(mm/dd/yyyy)Inches of RainfallDate(mm/dd/yyyy)Inches of RainfallTable G-2. Rainfall DataIn Table G-2, provide the inches of rainfall accumulated at the plant on a daily basis starting two weeks prior to the collection of the firstleachate sample through the last day of sample collection.YesG-10Approved: May 20, 2010Steam Electric QuestionnairePart G. Leachate Sampling Data for Ponds/Impoundments and LandfillsPlant ID:Plant Name:Part:GSection Title:Instructions:G5-1.Pond/ImpoundmentUnit or Landfill ID(Use IDs from TablesA-4 and A-6)CBI?tonstonstonstonstonstonstonstonstonsCBI?tonstonstonstonstonstonstonstonstonsCBI?tonstonstonstonstonstonstonstonstonsCBI?tonstonstonstonstonstonstonstonstonsCBI?tonstonstonstonstonstonstonstonstonsInsert Plant IDInsert Plant Name5. Waste InformationComplete Table G-3 for eachpond/impoundmentunit andlandfill, including those located on non-adjoining property, that is used for the storage, treatment, and/or disposalofresiduesor by-products (orsludgesor water streams containing the residues or by-products)from the combustion of coal or petroleum coke, including, but not limited to,fly ash,bottom ash,boiler slag, or flue gas desulfurization (FGD) system residues. This includes liquid-borne material and solid material. Enter the pond/impoundment unit or landfill ID in the first column ofTable G-3 (use pond/impoundment unit and landfill IDs assigned in Table A-4 and Table A-6). Please provideall free response answers in the highlighted yellow areas.Make a copy of Section 5 to complete as many tables as needed to provide information for all pond/impoundment units and landfills, including those located on non-adjoining property,using the "Copy Section 5" button below.In Table G-3, indicate all process wastes, residues or by-products that are stored, treated, and/or disposed of ineach pond/impoundment unit and/or landfill [Check allthat apply].Please provide any additional wastes not listed by selecting “Other” and specifying the process waste, residue, orby-product in the highlighted yellow space provided. Complete asmany rows of the table as needed to represent all pond/impoundment units and landfills at the plant. If more rows are needed, make additional copies of Table G-3and complete asmany tables as needed to provide information for allpond/impoundment units and landfills identified in Table A-4 and A-6.Type and Amount of WasteTable G-3. Waste InformationFly ashBottom ashBoiler slagFGD Calcium Sulfate (Gypsum)FGD Calcium Sulfate - Not PozzolanicFGD Pozzolanic MaterialOther:Other:Other:FGD Calcium Sulfate (Gypsum)FGD Calcium Sulfate - Not PozzolanicFGD Pozzolanic MaterialFGD Calcium Sulfate (Gypsum)FGD Calcium Sulfate - Not PozzolanicFGD Pozzolanic MaterialFGD Calcium Sulfate (Gypsum)FGD Calcium Sulfate - Not PozzolanicFGD Pozzolanic MaterialFGD Calcium Sulfate (Gypsum)FGD Calcium Sulfate - Not PozzolanicFGD Pozzolanic MaterialOther:Other:Other:Other:Other:Other:Other:Other:Other:Other:Other:Other:Fly ashBottom ashBoiler slagFly ashBottom ashBoiler slagFly ashBottom ashBoiler slagFly ashBottom ashBoiler slagYesYesYesYesYesCopy Section 5G-11Approved: May 20, 2010Steam Electric QuestionnairePart G. Leachate Sampling Data for Ponds/Impoundments and LandfillsPlant ID:Insert Plant IDPlant Name:Insert Plant NamePond/Impoundment Unit or Landfill ID:Insert IDSample Collection Location:Part:GSection Title:Instructions:CBI?CBI?CBI?Name of Analyte CAS NumberNonDetectIndicatorConcentration*(μg/L)MethodDetection Limit(MDL) (μg/L)Reporting Limit(μg/L) Qualifiers for the MeasurementOther:Other:Other:Other:Other:Other:Other:Other:7440-42-8Boron7440-43-9CadmiumBeryllium 7440-41-7Analytical Method Used7440-36-0ArsenicBarium 7440-39-3Laboratory Analytical Data FormAluminum 7429-90-5Example - Arsenic 7440-38-2 3502Complete Table G-4 for each untreatedand treatedsample collection locations. Enter the pond/impoundment unit or landfill ID (use pond/impoundment unit and landfill IDs assigned in TableA-4 and Table A-6) and the sample collection location (identified previously in Table G-1) in the spaces provided above. Also, identify the name of theanalytical laboratory that conducted theanalyses and provide the sample collection locationdescription previously identified in Table G-1. Report all results, including those below the reporting limit. Identify results that are less thanthe method detection limit (MDL), and results thatare between the detection and reporting limits. Forexample, if the MDL is equal to 5 ng/L, the reporting limit is equal to 15 ng/L, and thevalue reported by the laboratory is 12 ng/L, report12 ng/L as the measured value and identify and describe any qualifiers on the data in the corresponding column. If the measured value is notdetected, list the detection limit value and selectthe less than (<) symbol in the non-detect indicator column. Please provide all free response answersin the highlighted yellow areas.Make a copy of Sampling Results Table for the eachpond/impoundment unit and landfill chosen for the leachate sample collection using the "Copy SamplingResults Table" button below.7440-38-2Table G-4. Leachate Sampling Analytical Data FormName of analytical laboratory:Sample collection location description:Antimony10Detected in laboratory blank at lessthan 5 times the sample resultYesCopy Sampling Results TableData review summary attached.Sample Collection LocationEPA Method 200.7Analytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownYesYesG-12Approved: May 20, 2010Steam Electric QuestionnairePart G. Leachate Sampling Data for Ponds/Impoundments and LandfillsOther:Other:Other:Other:Other:Other:Other:Other:Other:Other:Other:Other:Other:Other:Other:Other:Other:Other:Other:Other:Other:Other:Other:Other:7439-97-6No CAS7440-31-57440-32-67440-62-27440-66-67440-22-47440-23-5No CAS7440-28-07439-95-47439-98-77440-02-07782-49-2No CASNo CASNo CAS7440-70-27440-47-37440-48-47440-50-87439-89-67439-92-17439-95-4ChloridesTotal dissolved solids (TDS)Total suspended solids (TSS)pHTitaniumVanadiumZincMercurySodiumSulfateThalliumTinMolybdenumNickelSeleniumSilverIronLeadMagnesiumManganeseCalciumChromiumCobaltCopper*If not detected, list the detection limit value and select the less than (<) symbol in the non-detectindicator column.Analytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodAnalytical MethodNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownNon-Detect Drop DownG-13Approved: May 20, 2010Steam Electric QuestionnairePart G. Leachate Sampling Data for Ponds/Impoundments and LandfillsPlant Name: Insert Plant IDPlant ID: Insert Plant NamePart:GSection Title:Part G CommentsInstructions:Question NumberCBI?CBI?CBI?CBI?CBI?CBI?CBI?CBI?CBI?CBI?CBI?CBI?CBI?Cross reference your comments by question number and indicate the confidential status of your comment by checking the box next to "Yes" under"CBI?" (Confidential Business Information).CommentYesYesYesYesYesYesYesYesYesYesYesYesYesG-14Approved: May 20, 2010Steam Electric QuestionnairePart G. Leachate Sampling Data for Ponds/Impoundments and LandfillsCBI?CBI?CBI?CBI?CBI?CBI?CBI?CBI?CBI?CBI?CBI?CBI?YesYesYesYesYesYesYesYesYesYesYesYesG-15Approved: May 20, 2010

# Steam Electric Questionnaire Part G. Leachate Sampli ng Data for Ponds/Impoundments and Landfills

Analytical Method Sample Collection Location

Analytical Method Sample Collection Location

40 CRF Part 136-approved Treated pond/impoundment

EPA Method 200.7 Untreated pond/impoundment

EPA Method 200.8 Treated Landfill

EPA Method 1631E Untreated Landfill

Other

Non-Detect Drop Down

Non-Detect Drop Down

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# Part G Drop Downs

Approved: May 20, 2010