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Clean Harbors Inc. – ‘10-Q’ for 6/30/20 – ‘EX-101.SCH’

On:  Wednesday, 8/5/20, at 11:00am ET   ·   For:  6/30/20   ·   Accession #:  822818-20-20   ·   File #:  1-34223

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  As Of               Filer                 Filing    For·On·As Docs:Size

 8/05/20  Clean Harbors Inc.                10-Q        6/30/20   83:10M

Quarterly Report   —   Form 10-Q
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-Q        Quarterly Report                                    HTML   1.03M 
 2: EX-31.1     Certification -- §302 - SOA'02                      HTML     26K 
 3: EX-31.2     Certification -- §302 - SOA'02                      HTML     26K 
 4: EX-32       Certification -- §906 - SOA'02                      HTML     25K 
11: R1          Cover                                               HTML     74K 
12: R2          Consolidated Balance Sheets                         HTML    130K 
13: R3          Consolidated Balance Sheets (Parenthetical)         HTML     39K 
14: R4          Unaudited Consolidated Statements of Operations     HTML     89K 
15: R5          Unaudited Consolidated Statements of Operations     HTML     24K 
                (Parenthetical)                                                  
16: R6          Unaudited Consolidated Statements of Comprehensive  HTML     53K 
                Income (Loss)                                                    
17: R7          Unaudited Consolidated Statements of Cash Flows     HTML    133K 
18: R8          Unaudited Consolidated Statements of Stockholders'  HTML     83K 
                Equity                                                           
19: R9          Basis of Presentation                               HTML     26K 
20: R10         Significant Accounting Policies                     HTML     25K 
21: R11         Revenues                                            HTML    224K 
22: R12         Business Combinations                               HTML     25K 
23: R13         Inventories and Supplies                            HTML     34K 
24: R14         Property, Plant and Equipment                       HTML     48K 
25: R15         Goodwill and Other Intangible Assets                HTML     89K 
26: R16         Accrued Expenses                                    HTML     37K 
27: R17         Closure and Post-Closure Liabilities                HTML     49K 
28: R18         Remedial Liabilities                                HTML     48K 
29: R19         Financing Arrangements                              HTML     46K 
30: R20         Income Taxes                                        HTML     28K 
31: R21         Earnings Per Share                                  HTML     58K 
32: R22         Accumulated Other Comprehensive Loss                HTML     60K 
33: R23         Stock-Based Compensation                            HTML     48K 
34: R24         Commitments and Contingencies                       HTML     40K 
35: R25         Segment Reporting                                   HTML    184K 
36: R26         Significant Accounting Policies (Policies)          HTML     35K 
37: R27         Revenues (Tables)                                   HTML    212K 
38: R28         Inventories and Supplies (Tables)                   HTML     35K 
39: R29         Property, Plant and Equipment (Tables)              HTML     47K 
40: R30         Goodwill and Other Intangible Assets (Tables)       HTML    132K 
41: R31         Accrued Expenses (Tables)                           HTML     37K 
42: R32         Closure and Post-Closure Liabilities (Tables)       HTML     48K 
43: R33         Remedial Liabilities (Tables)                       HTML     48K 
44: R34         Financing Arrangements (Tables)                     HTML     44K 
45: R35         Earnings Per Share (Tables)                         HTML     56K 
46: R36         Accumulated Other Comprehensive Loss (Tables)       HTML     61K 
47: R37         Stock-Based Compensation (Tables)                   HTML     46K 
48: R38         Segment Reporting (Tables)                          HTML    184K 
49: R39         Significant Accounting Policies (Details)           HTML     23K 
50: R40         REVENUES - Disaggregation of Revenue (Details)      HTML     84K 
51: R41         REVENUES - Contract Balances (Details)              HTML     28K 
52: R42         REVENUES - Narrative (Details)                      HTML     23K 
53: R43         Business Combinations (Details)                     HTML     31K 
54: R44         Inventories and Supplies (Details)                  HTML     31K 
55: R45         PROPERTY, PLANT AND EQUIPMENT - Schedule of         HTML     53K 
                Property, Plant and Equipment (Details)                          
56: R46         PROPERTY, PLANT AND EQUIPMENT - Narrative           HTML     23K 
                (Details)                                                        
57: R47         GOODWILL AND OTHER INTANGIBLE ASSETS - Rollforward  HTML     40K 
                of Goodwill (Details)                                            
58: R48         GOODWILL AND OTHER INTANGIBLE ASSETS - Amortizable  HTML     46K 
                Other Intangible Assets (Details)                                
59: R49         GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative    HTML     24K 
                (Details)                                                        
60: R50         GOODWILL AND OTHER INTANGIBLE ASSETS - Expected     HTML     37K 
                Future Amortization (Details)                                    
61: R51         Accrued Expenses (Details)                          HTML     39K 
62: R52         Closure and Post-Closure Liabilities (Details)      HTML     51K 
63: R53         Remedial Liabilities (Details)                      HTML     47K 
64: R54         FINANCING ARRANGEMENTS - Summary of Financing       HTML     46K 
                Arrangements (Details)                                           
65: R55         FINANCING ARRANGEMENTS - Narrative (Details)        HTML     59K 
66: R56         Income Taxes (Details)                              HTML     31K 
67: R57         EARNINGS PER SHARE - Computation of Basic and       HTML     53K 
                Diluted Earnings Per Share (Details)                             
68: R58         EARNINGS PER SHARE - Narrative (Details)            HTML     29K 
69: R59         ACCUMULATED OTHER COMPREHENSIVE LOSS - Changes in   HTML     63K 
                Accumulated Other Comprehensive Loss by Component                
                (Details)                                                        
70: R60         ACCUMULATED OTHER COMPREHENSIVE LOSS -              HTML     27K 
                Reclassified Out of Accumulated Other                            
                Comprehensive Loss (Details)                                     
71: R61         STOCK-BASED COMPENSATION - Additional Information   HTML     31K 
                (Details)                                                        
72: R62         STOCK-BASED COMPENSATION - Restricted Stock Awards  HTML     54K 
                (Details)                                                        
73: R63         STOCK-BASED COMPENSATION - Performance Stock        HTML     52K 
                Awards (Details)                                                 
74: R64         Commitments and Contingencies (Details)             HTML     75K 
75: R65         SEGMENT REPORTING - Narrative (Details)             HTML     23K 
76: R66         SEGMENT REPORTING - Third Party Revenues to Direct  HTML     49K 
                Revenues (Details)                                               
77: R67         SEGMENT REPORTING - Adjusted EBITDA Information     HTML     52K 
                (Details)                                                        
78: R68         SEGMENT REPORTING - Assets by Reportable Segment    HTML     43K 
                (Details)                                                        
79: R69         SEGMENT REPORTING - Total Assets by Geographical    HTML     30K 
                Area (Details)                                                   
81: XML         IDEA XML File -- Filing Summary                      XML    149K 
10: XML         XBRL Instance -- clh-20200630_htm                    XML   2.93M 
80: EXCEL       IDEA Workbook of Financial Reports                  XLSX     99K 
 6: EX-101.CAL  XBRL Calculations -- clh-20200630_cal                XML    247K 
 7: EX-101.DEF  XBRL Definitions -- clh-20200630_def                 XML    539K 
 8: EX-101.LAB  XBRL Labels -- clh-20200630_lab                      XML   1.44M 
 9: EX-101.PRE  XBRL Presentations -- clh-20200630_pre               XML    858K 
 5: EX-101.SCH  XBRL Schema -- clh-20200630                          XSD    162K 
82: JSON        XBRL Instance as JSON Data -- MetaLinks              347±   507K 
83: ZIP         XBRL Zipped Folder -- 0000822818-20-000020-xbrl      Zip    302K

‘EX-101.SCH’   —   XBRL Schema — clh-20200630

This Exhibit is an XBRL XML File.

                                                                                                                                                                                
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<link:roleType id="SIGNIFICANTACCOUNTINGPOLICIESPolicies" roleURI="http://www.cleanharbors.com/role/SIGNIFICANTACCOUNTINGPOLICIESPolicies">
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<link:definition> 2422410 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Amortizable Other Intangible Assets (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
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<link:definition> 2422410 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Amortizable Other Intangible Assets (Details) </link:definition>
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<link:definition> 2423411 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) </link:definition>
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<link:definition> 2424412 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Expected Future Amortization (Details) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2125108 - Disclosure - ACCRUED EXPENSES </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2326305 - Disclosure - ACCRUED EXPENSES (Tables) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2427413 - Disclosure - ACCRUED EXPENSES (Details) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2128109 - Disclosure - CLOSURE AND POST-CLOSURE LIABILITIES </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2329306 - Disclosure - CLOSURE AND POST-CLOSURE LIABILITIES (Tables) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2430414 - Disclosure - CLOSURE AND POST-CLOSURE LIABILITIES (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:definition> 2131110 - Disclosure - REMEDIAL LIABILITIES </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:definition> 2332307 - Disclosure - REMEDIAL LIABILITIES (Tables) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2433415 - Disclosure - REMEDIAL LIABILITIES (Details) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2134111 - Disclosure - FINANCING ARRANGEMENTS </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:definition> 2335308 - Disclosure - FINANCING ARRANGEMENTS (Tables) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2436416 - Disclosure - FINANCING ARRANGEMENTS - Summary of Financing Arrangements (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:definition> 2437417 - Disclosure - FINANCING ARRANGEMENTS - Narrative (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<link:definition> 2138112 - Disclosure - INCOME TAXES </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
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<link:roleType id="INCOMETAXESDetails" roleURI="http://www.cleanharbors.com/role/INCOMETAXESDetails">
<link:definition> 2439418 - Disclosure - INCOME TAXES (Details) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2140113 - Disclosure - EARNINGS PER SHARE </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2341309 - Disclosure - EARNINGS PER SHARE (Tables) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2442419 - Disclosure - EARNINGS PER SHARE - Computation of Basic and Diluted Earnings Per Share (Details) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2443420 - Disclosure - EARNINGS PER SHARE - Narrative (Details) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2144114 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2345310 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2446421 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS - Changes in Accumulated Other Comprehensive Loss by Component (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2447422 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS - Reclassified Out of Accumulated Other Comprehensive Loss (Details) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2148115 - Disclosure - STOCK-BASED COMPENSATION </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2349311 - Disclosure - STOCK-BASED COMPENSATION (Tables) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2450423 - Disclosure - STOCK-BASED COMPENSATION - Additional Information (Details) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2451424 - Disclosure - STOCK-BASED COMPENSATION - Restricted Stock Awards (Details) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2452425 - Disclosure - STOCK-BASED COMPENSATION - Performance Stock Awards (Details) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2153116 - Disclosure - COMMITMENTS AND CONTINGENCIES </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2454426 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2155117 - Disclosure - SEGMENT REPORTING </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:roleType id="SEGMENTREPORTINGTables" roleURI="http://www.cleanharbors.com/role/SEGMENTREPORTINGTables">
<link:definition> 2356312 - Disclosure - SEGMENT REPORTING (Tables) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2457427 - Disclosure - SEGMENT REPORTING - Narrative (Details) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2458428 - Disclosure - SEGMENT REPORTING - Third Party Revenues to Direct Revenues (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2459429 - Disclosure - SEGMENT REPORTING - Adjusted EBITDA Information (Details) </link:definition>
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<link:usedOn> link:calculationLink </link:usedOn>
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<link:definition> 2460430 - Disclosure - SEGMENT REPORTING - Assets by Reportable Segment (Details) </link:definition>
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<link:definition> 2461431 - Disclosure - SEGMENT REPORTING - Total Assets by Geographical Area (Details) </link:definition>
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<xs:element id="clh_RightofUseAssetObtainedinExchangeforFinanceLeaseLiabilityIncludingTransfers" abstract="false" name="RightofUseAssetObtainedinExchangeforFinanceLeaseLiabilityIncludingTransfers" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="clh_NonLandfillRetirementLiabilityMember" abstract="true" name="NonLandfillRetirementLiabilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_SiteContingencyNotRequiringEnvironmentalRemediationExpenseNumberOfSitesOwnedByThirdParty" abstract="false" name="SiteContingencyNotRequiringEnvironmentalRemediationExpenseNumberOfSitesOwnedByThirdParty" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
<xs:element id="clh_AdditionsToIntangibleAssetsIncludingCostsToObtainOrRenewPermits" abstract="false" name="AdditionsToIntangibleAssetsIncludingCostsToObtainOrRenewPermits" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="clh_UnbilledAccountsReceivableCurrent" abstract="false" name="UnbilledAccountsReceivableCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="clh_ContingencyNatureDomain" abstract="true" name="ContingencyNatureDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_UnrecognizedTaxBenefitsAndOtherLongTermLiabilitiesNoncurrent" abstract="false" name="UnrecognizedTaxBenefitsAndOtherLongTermLiabilitiesNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="clh_RemedialLiabilitiesForLandfillSitesMember" abstract="true" name="RemedialLiabilitiesForLandfillSitesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_NumberOfNeighboringMunicipalitiesFilingSeparateLegalProceedings" abstract="false" name="NumberOfNeighboringMunicipalitiesFilingSeparateLegalProceedings" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
<xs:element id="clh_EnergyRelatedInventorySuppliesAndDrums" abstract="false" name="EnergyRelatedInventorySuppliesAndDrums" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="clh_ScheduleOfFiniteLivedAndIndefiniteLivedIntangibleAssetsLineItems" abstract="true" name="ScheduleOfFiniteLivedAndIndefiniteLivedIntangibleAssetsLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
<xs:element id="clh_CashPaymentsForInterestAndIncomeTaxesAbstract" abstract="true" name="CashPaymentsForInterestAndIncomeTaxesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
<xs:element id="clh_SiteContingencyNumberOfSitesOwnedByEntity" abstract="false" name="SiteContingencyNumberOfSitesOwnedByEntity" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
<xs:element id="clh_VehiclesIncludingFinanceLeaseROUAssetsMember" abstract="true" name="VehiclesIncludingFinanceLeaseROUAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_LegalAndAdministrativeProceedingsMember" abstract="true" name="LegalAndAdministrativeProceedingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_TechnicalServicesMember" abstract="true" name="TechnicalServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_AssetRetirementObligationsDiscountRate" abstract="false" name="AssetRetirementObligationsDiscountRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType"/>
<xs:element id="clh_SiteContingencyNumberOfSitesOwnedByThirdParty" abstract="false" name="SiteContingencyNumberOfSitesOwnedByThirdParty" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
<xs:element id="clh_PermitsMember" abstract="true" name="PermitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_AccruedExpensesDisclosureTextBlock" abstract="false" name="AccruedExpensesDisclosureTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
<xs:element id="clh_SafetyKleenOilMember" abstract="true" name="SafetyKleenOilMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_RemedialLiabilitiesForInactiveSitesMember" abstract="true" name="RemedialLiabilitiesForInactiveSitesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_A2019AcquisitionsMember" abstract="true" name="A2019AcquisitionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_SiteContingencyIndemnificationAgreementNumberOfSitesOwnedByThirdParty" abstract="false" name="SiteContingencyIndemnificationAgreementNumberOfSitesOwnedByThirdParty" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
<xs:element id="clh_FederalAndStateEnforcementActionsMember" abstract="true" name="FederalAndStateEnforcementActionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_BuildingsAndImprovementIncludingFinanceLeasesROUAssetsMember" abstract="true" name="BuildingsAndImprovementIncludingFinanceLeasesROUAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_ClosureAndPostClosureLiabilitiesAxis" abstract="true" name="ClosureAndPostClosureLiabilitiesAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
<xs:element id="clh_SiteContingencyEnvironmentalRemediationExpenseSettledNumberOfSitesOwnedByThirdParty" abstract="false" name="SiteContingencyEnvironmentalRemediationExpenseSettledNumberOfSitesOwnedByThirdParty" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
<xs:element id="clh_NumberofSitesPotentialLiabilityExceedsSubstantialQuota" abstract="false" name="NumberofSitesPotentialLiabilityExceedsSubstantialQuota" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
<xs:element id="clh_ReconciliationBetweenAdjustedEBITDAandIncomeStatementAbstract" abstract="true" name="ReconciliationBetweenAdjustedEBITDAandIncomeStatementAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
<xs:element id="clh_EnvironmentalServicesMember" abstract="true" name="EnvironmentalServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_ClosureAndPostClosureLiabilitiesTable" abstract="true" name="ClosureAndPostClosureLiabilitiesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
<xs:element id="clh_CertainOtherThirdPartySitesMember" abstract="true" name="CertainOtherThirdPartySitesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_ContractWithCustomerLiabilityRecognitionInSubsequentPeriod" abstract="false" name="ContractWithCustomerLiabilityRecognitionInSubsequentPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
<xs:element id="clh_EnvironmentalContingenciesTable" abstract="true" name="EnvironmentalContingenciesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
<xs:element id="clh_NumberOfPermitsIssuedByGovernmentToDumpOrganicLiquid" abstract="false" name="NumberOfPermitsIssuedByGovernmentToDumpOrganicLiquid" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
<xs:element id="clh_FieldandEmergencyResponseMember" abstract="true" name="FieldandEmergencyResponseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_ScheduleOfFiniteLivedAndIndefiniteLivedIntangibleAssetsTable" abstract="true" name="ScheduleOfFiniteLivedAndIndefiniteLivedIntangibleAssetsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
<xs:element id="clh_ContingenciesLineItems" abstract="true" name="ContingenciesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
<xs:element id="clh_CampEquipmentMember" abstract="true" name="CampEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_LossContingencyGeneralDamagesSoughtValue" abstract="false" name="LossContingencyGeneralDamagesSoughtValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="clh_TermLoanAgreementMember" abstract="true" name="TermLoanAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_A2020StockIncentivePlanMember" abstract="true" name="A2020StockIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_ContingenciesByNatureOfContingencyAxis" abstract="true" name="ContingenciesByNatureOfContingencyAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
<xs:element id="clh_BenefitUnderCARESActAndCEWSAmount" abstract="false" name="BenefitUnderCARESActAndCEWSAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="clh_SiteContingencyEnvironmentalRemediationExpenseNumberOfSitesOwnedByThirdParty" abstract="false" name="SiteContingencyEnvironmentalRemediationExpenseNumberOfSitesOwnedByThirdParty" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
<xs:element id="clh_AssetRetirementObligationChangesRecordedInBalanceSheet" abstract="false" name="AssetRetirementObligationChangesRecordedInBalanceSheet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="clh_RemedialLiabilitiesIncludingSuperfundForNonLandfillOperationsMember" abstract="true" name="RemedialLiabilitiesIncludingSuperfundForNonLandfillOperationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
<xs:element id="clh_SeniorUnsecuredNotesdue2027Member" abstract="true" name="SeniorUnsecuredNotesdue2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
</xs:schema>

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