"You are an auditor for XBRL filings. \nGiven two concepts and the provided filing (schema, presentation, calculation, definition, label, instance, and US GAAP taxonomy),\ndetermine which one of the following erroneous relationship types best describes the relationship between the two concepts:\n\n(1) Reversal  \n    Definition: A relationship is flagged as Reversal when the filer\u2019s extension taxonomy redefines element hierarchy inconsistently with the US GAAP taxonomy. Specifically, this occurs when an element that should be a sibling in the US GAAP taxonomy is instead defined as a child of another element (or vice versa, a child element is incorrectly redefined as a sibling).\n\n(2) Inappropriateness  \n    Definition: A relationship is flagged as Inappropriateness when elements appear under an abstract category where they do not belong, contrary to the US GAAP taxonomy.\n\n(3) CombinationErr  \n    Definition: A relationship is flagged as CombinationErr when an axis in the filer\u2019s extension taxonomy is associated with inappropriate members not permitted by the US GAAP taxonomy.\n\nYou must reference the US GAAP taxonomy to retrieve and check the two concepts across the entire filing.\nOutput only one of the following labels exactly, chosen strictly from:\n[\"Reversal\", \"Inappropriateness\", \"CombinationErr\"].\n\nNo explanations. No extra text. Only the label.\n\n    \n##Schema document\nNone\n\n##Presentation linkbase document\n<?xml version='1.0' encoding='US-ASCII'?>\n<link:linkbase xmlns:link=\"http://www.xbrl.org/2003/linkbase\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd\"><link:roleRef roleURI=\"http://www.chpk.com/role/CondensedConsolidatedStatementsofStockholdersEquityUnaudited\" xlink:type=\"simple\" xlink:href=\"cpk-20230930.xsd#CondensedConsolidatedStatementsofStockholdersEquityUnaudited\"/>\n  <link:presentationLink xlink:role=\"http://www.chpk.com/role/CondensedConsolidatedStatementsofStockholdersEquityUnaudited\" xlink:type=\"extended\">\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StatementOfStockholdersEquityAbstract_7ab6159b-8b6c-4e82-b67c-5320f4a94bdf\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementOfStockholdersEquityAbstract\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StatementTable_fddc5256-8ee3-4b93-93c4-48bb656590fe\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_StatementOfStockholdersEquityAbstract_7ab6159b-8b6c-4e82-b67c-5320f4a94bdf\" xlink:to=\"loc_us-gaap_StatementTable_fddc5256-8ee3-4b93-93c4-48bb656590fe\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StatementEquityComponentsAxis_dd5c284c-ed85-42db-b6b6-0cfb11c89f81\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_StatementTable_fddc5256-8ee3-4b93-93c4-48bb656590fe\" xlink:to=\"loc_us-gaap_StatementEquityComponentsAxis_dd5c284c-ed85-42db-b6b6-0cfb11c89f81\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_StatementEquityComponentsAxis_dd5c284c-ed85-42db-b6b6-0cfb11c89f81\" xlink:to=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CommonStockMember_99ad8d81-2d16-4635-a7e6-d0f98ee5b65a\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:to=\"loc_us-gaap_CommonStockMember_99ad8d81-2d16-4635-a7e6-d0f98ee5b65a\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_AdditionalPaidInCapitalMember_b51dcfe2-076d-4c9e-aa27-314a59acc4e6\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapitalMember\"/>\n    <link:presentationArc order=\"2\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:to=\"loc_us-gaap_AdditionalPaidInCapitalMember_b51dcfe2-076d-4c9e-aa27-314a59acc4e6\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/verboseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_RetainedEarningsMember_9d30f9cd-dcd2-40ce-853e-b1c3e6762f0a\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsMember\"/>\n    <link:presentationArc order=\"3\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:to=\"loc_us-gaap_RetainedEarningsMember_9d30f9cd-dcd2-40ce-853e-b1c3e6762f0a\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_a70c3255-0abb-47c1-8c84-4812eef2303f\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember\"/>\n    <link:presentationArc order=\"4\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:to=\"loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_a70c3255-0abb-47c1-8c84-4812eef2303f\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/verboseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_DeferredCompensationShareBasedPaymentsMember_073ed179-d4e5-4a06-a81e-6ef430611762\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredCompensationShareBasedPaymentsMember\"/>\n    <link:presentationArc order=\"5\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:to=\"loc_us-gaap_DeferredCompensationShareBasedPaymentsMember_073ed179-d4e5-4a06-a81e-6ef430611762\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_TreasuryStockMember_d1a108a8-d594-4ab0-85ae-6366d1909bb9\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockMember\"/>\n    <link:presentationArc order=\"6\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:to=\"loc_us-gaap_TreasuryStockMember_d1a108a8-d594-4ab0-85ae-6366d1909bb9\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_TreasuryStockPreferredMember_fd72f477-587c-4a16-bf11-ec5112d80240\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockPreferredMember\"/>\n    <link:presentationArc order=\"7\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:to=\"loc_us-gaap_TreasuryStockPreferredMember_fd72f477-587c-4a16-bf11-ec5112d80240\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_TreasuryStockCommonMember_437503f8-4335-4258-8ce9-b4130438f334\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonMember\"/>\n    <link:presentationArc order=\"8\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:to=\"loc_us-gaap_TreasuryStockCommonMember_437503f8-4335-4258-8ce9-b4130438f334\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StatementLineItems_50dfb789-8c36-4c92-823e-b7c6af3eef6a\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems\"/>\n    <link:presentationArc order=\"2\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_StatementTable_fddc5256-8ee3-4b93-93c4-48bb656590fe\" xlink:to=\"loc_us-gaap_StatementLineItems_50dfb789-8c36-4c92-823e-b7c6af3eef6a\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CommonStockDividendsPerShareDeclared_d98cbc2f-5918-43ba-b3ff-0ea0e5775c56\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockDividendsPerShareDeclared\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_StatementLineItems_50dfb789-8c36-4c92-823e-b7c6af3eef6a\" xlink:to=\"loc_us-gaap_CommonStockDividendsPerShareDeclared_d98cbc2f-5918-43ba-b3ff-0ea0e5775c56\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_PreferredStockSharesAuthorized_50d2d60f-6bbb-4d36-bbed-8ad82189be26\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockSharesAuthorized\"/>\n    <link:presentationArc order=\"2\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_StatementLineItems_50dfb789-8c36-4c92-823e-b7c6af3eef6a\" xlink:to=\"loc_us-gaap_PreferredStockSharesAuthorized_50d2d60f-6bbb-4d36-bbed-8ad82189be26\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_PreferredStockParOrStatedValuePerShare_465f5548-756d-4dca-b4f3-8d90afadaebc\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockParOrStatedValuePerShare\"/>\n    <link:presentationArc order=\"3\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_StatementLineItems_50dfb789-8c36-4c92-823e-b7c6af3eef6a\" xlink:to=\"loc_us-gaap_PreferredStockParOrStatedValuePerShare_465f5548-756d-4dca-b4f3-8d90afadaebc\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward\"/>\n    <link:presentationArc order=\"4\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_StatementLineItems_50dfb789-8c36-4c92-823e-b7c6af3eef6a\" xlink:to=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SharesIssued_e24164d2-8c02-4716-94df-901fd7c11763\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesIssued\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_SharesIssued_e24164d2-8c02-4716-94df-901fd7c11763\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/periodStartLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StockholdersEquity_804cae75-8262-461a-93b5-bf4118f0f8e4\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity\"/>\n    <link:presentationArc order=\"2\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_StockholdersEquity_804cae75-8262-461a-93b5-bf4118f0f8e4\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/periodStartLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_NetIncomeLoss_3beb2886-8b3e-45e2-a27f-78a7b206b94e\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss\"/>\n    <link:presentationArc order=\"3\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_NetIncomeLoss_3beb2886-8b3e-45e2-a27f-78a7b206b94e\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_4fa13c68-774d-40e8-911b-2cdbe7fc34bb\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent\"/>\n    <link:presentationArc order=\"4\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_4fa13c68-774d-40e8-911b-2cdbe7fc34bb\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_487c3a57-4d66-42a0-89c9-0cf6d6e4d8df\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax\"/>\n    <link:presentationArc order=\"5\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_487c3a57-4d66-42a0-89c9-0cf6d6e4d8df\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_Dividends_f58d7ce6-3084-4245-b8c1-0489a131be94\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Dividends\"/>\n    <link:presentationArc order=\"6\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_Dividends_f58d7ce6-3084-4245-b8c1-0489a131be94\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2009/role/negatedTerseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_PaymentsOfStockIssuanceCosts_1521a0a7-ed57-498a-a351-691eface0f6c\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsOfStockIssuanceCosts\"/>\n    <link:presentationArc order=\"7\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_PaymentsOfStockIssuanceCosts_1521a0a7-ed57-498a-a351-691eface0f6c\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_StockIssuedDuringThePeriodSharesRetirementSavingsPlanAndDividendReinvestmentPlan_fb586ae0-07d6-458d-932d-88d8b56d42fd\" xlink:href=\"cpk-20230930.xsd#cpk_StockIssuedDuringThePeriodSharesRetirementSavingsPlanAndDividendReinvestmentPlan\"/>\n    <link:presentationArc order=\"8\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_cpk_StockIssuedDuringThePeriodSharesRetirementSavingsPlanAndDividendReinvestmentPlan_fb586ae0-07d6-458d-932d-88d8b56d42fd\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan_493c2a09-1bf4-4d7b-b23a-ffbe2eff720d\" xlink:href=\"cpk-20230930.xsd#cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan\"/>\n    <link:presentationArc order=\"9\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan_493c2a09-1bf4-4d7b-b23a-ffbe2eff720d\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_c5a143a6-f65b-4962-bfe2-b3e1df8eb7ce\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation\"/>\n    <link:presentationArc order=\"10\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_c5a143a6-f65b-4962-bfe2-b3e1df8eb7ce\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_05cb5494-ec23-4a3a-9f8b-13d9fc3cda50\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation\"/>\n    <link:presentationArc order=\"11\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_05cb5494-ec23-4a3a-9f8b-13d9fc3cda50\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue_d074cf30-79dd-4c04-8a1e-0f5ea8e483b2\" xlink:href=\"cpk-20230930.xsd#cpk_TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue\"/>\n    <link:presentationArc order=\"12\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_cpk_TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue_d074cf30-79dd-4c04-8a1e-0f5ea8e483b2\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SharesIssued_def54f91-fdf4-4a09-9eaa-32c0248c628c\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesIssued\"/>\n    <link:presentationArc order=\"13\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_SharesIssued_def54f91-fdf4-4a09-9eaa-32c0248c628c\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/periodEndLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StockholdersEquity_c158881d-4f73-4d39-82e7-fad433d5ff2c\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity\"/>\n    <link:presentationArc order=\"14\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_StockholdersEquity_c158881d-4f73-4d39-82e7-fad433d5ff2c\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/periodEndLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_SharesHeldInTrustForDeferredCompensationPlan_d5f5b1f0-eb20-42cb-8a17-4b1a20651ba8\" xlink:href=\"cpk-20230930.xsd#cpk_SharesHeldInTrustForDeferredCompensationPlan\"/>\n    <link:presentationArc order=\"5\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_StatementLineItems_50dfb789-8c36-4c92-823e-b7c6af3eef6a\" xlink:to=\"loc_cpk_SharesHeldInTrustForDeferredCompensationPlan_d5f5b1f0-eb20-42cb-8a17-4b1a20651ba8\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_1cd05e01-c38b-46e8-baa5-0f1dd42e2981\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\"/>\n    <link:presentationArc order=\"6\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_StatementLineItems_50dfb789-8c36-4c92-823e-b7c6af3eef6a\" xlink:to=\"loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_1cd05e01-c38b-46e8-baa5-0f1dd42e2981\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n  </link:presentationLink>\n  </link:linkbase>\n\n\n##Calculation linkbase document\n<?xml version='1.0' encoding='US-ASCII'?>\n<link:linkbase xmlns:link=\"http://www.xbrl.org/2003/linkbase\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd\"/>\n\n\n##Definition linkbase document\n<?xml version='1.0' encoding='US-ASCII'?>\n<link:linkbase xmlns:link=\"http://www.xbrl.org/2003/linkbase\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xbrldt=\"http://xbrl.org/2005/xbrldt\" xsi:schemaLocation=\"http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd\"><link:arcroleRef arcroleURI=\"http://xbrl.org/int/dim/arcrole/all\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/2005/xbrldt-2005.xsd#all\"/>\n  <link:arcroleRef arcroleURI=\"http://xbrl.org/int/dim/arcrole/hypercube-dimension\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension\"/>\n  <link:arcroleRef arcroleURI=\"http://xbrl.org/int/dim/arcrole/dimension-default\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default\"/>\n  <link:arcroleRef arcroleURI=\"http://xbrl.org/int/dim/arcrole/dimension-domain\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain\"/>\n  <link:arcroleRef arcroleURI=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member\"/>\n  <link:roleRef roleURI=\"http://www.chpk.com/role/CondensedConsolidatedStatementsofStockholdersEquityUnaudited\" xlink:type=\"simple\" xlink:href=\"cpk-20230930.xsd#CondensedConsolidatedStatementsofStockholdersEquityUnaudited\"/>\n  <link:definitionLink xlink:role=\"http://www.chpk.com/role/CondensedConsolidatedStatementsofStockholdersEquityUnaudited\" xlink:type=\"extended\">\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StatementLineItems_50dfb789-8c36-4c92-823e-b7c6af3eef6a\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CommonStockDividendsPerShareDeclared_d98cbc2f-5918-43ba-b3ff-0ea0e5775c56\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockDividendsPerShareDeclared\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_StatementLineItems_50dfb789-8c36-4c92-823e-b7c6af3eef6a\" xlink:to=\"loc_us-gaap_CommonStockDividendsPerShareDeclared_d98cbc2f-5918-43ba-b3ff-0ea0e5775c56\" xlink:type=\"arc\" order=\"0\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_PreferredStockSharesAuthorized_50d2d60f-6bbb-4d36-bbed-8ad82189be26\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockSharesAuthorized\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_StatementLineItems_50dfb789-8c36-4c92-823e-b7c6af3eef6a\" xlink:to=\"loc_us-gaap_PreferredStockSharesAuthorized_50d2d60f-6bbb-4d36-bbed-8ad82189be26\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_PreferredStockParOrStatedValuePerShare_465f5548-756d-4dca-b4f3-8d90afadaebc\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockParOrStatedValuePerShare\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_StatementLineItems_50dfb789-8c36-4c92-823e-b7c6af3eef6a\" xlink:to=\"loc_us-gaap_PreferredStockParOrStatedValuePerShare_465f5548-756d-4dca-b4f3-8d90afadaebc\" xlink:type=\"arc\" order=\"2\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_StatementLineItems_50dfb789-8c36-4c92-823e-b7c6af3eef6a\" xlink:to=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:type=\"arc\" order=\"3\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SharesIssued_e24164d2-8c02-4716-94df-901fd7c11763\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesIssued\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_SharesIssued_e24164d2-8c02-4716-94df-901fd7c11763\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StockholdersEquity_804cae75-8262-461a-93b5-bf4118f0f8e4\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_StockholdersEquity_804cae75-8262-461a-93b5-bf4118f0f8e4\" xlink:type=\"arc\" order=\"2\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_NetIncomeLoss_3beb2886-8b3e-45e2-a27f-78a7b206b94e\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_NetIncomeLoss_3beb2886-8b3e-45e2-a27f-78a7b206b94e\" xlink:type=\"arc\" order=\"3\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_4fa13c68-774d-40e8-911b-2cdbe7fc34bb\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_4fa13c68-774d-40e8-911b-2cdbe7fc34bb\" xlink:type=\"arc\" order=\"4\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_487c3a57-4d66-42a0-89c9-0cf6d6e4d8df\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_487c3a57-4d66-42a0-89c9-0cf6d6e4d8df\" xlink:type=\"arc\" order=\"5\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_Dividends_f58d7ce6-3084-4245-b8c1-0489a131be94\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Dividends\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_Dividends_f58d7ce6-3084-4245-b8c1-0489a131be94\" xlink:type=\"arc\" order=\"6\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_PaymentsOfStockIssuanceCosts_1521a0a7-ed57-498a-a351-691eface0f6c\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsOfStockIssuanceCosts\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_PaymentsOfStockIssuanceCosts_1521a0a7-ed57-498a-a351-691eface0f6c\" xlink:type=\"arc\" order=\"7\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_StockIssuedDuringThePeriodSharesRetirementSavingsPlanAndDividendReinvestmentPlan_fb586ae0-07d6-458d-932d-88d8b56d42fd\" xlink:href=\"cpk-20230930.xsd#cpk_StockIssuedDuringThePeriodSharesRetirementSavingsPlanAndDividendReinvestmentPlan\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_cpk_StockIssuedDuringThePeriodSharesRetirementSavingsPlanAndDividendReinvestmentPlan_fb586ae0-07d6-458d-932d-88d8b56d42fd\" xlink:type=\"arc\" order=\"8\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan_493c2a09-1bf4-4d7b-b23a-ffbe2eff720d\" xlink:href=\"cpk-20230930.xsd#cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan_493c2a09-1bf4-4d7b-b23a-ffbe2eff720d\" xlink:type=\"arc\" order=\"9\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_c5a143a6-f65b-4962-bfe2-b3e1df8eb7ce\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_c5a143a6-f65b-4962-bfe2-b3e1df8eb7ce\" xlink:type=\"arc\" order=\"10\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_05cb5494-ec23-4a3a-9f8b-13d9fc3cda50\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_05cb5494-ec23-4a3a-9f8b-13d9fc3cda50\" xlink:type=\"arc\" order=\"11\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue_d074cf30-79dd-4c04-8a1e-0f5ea8e483b2\" xlink:href=\"cpk-20230930.xsd#cpk_TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_50d22ed1-6e08-4b63-b9e5-9b4497bab8b7\" xlink:to=\"loc_cpk_TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue_d074cf30-79dd-4c04-8a1e-0f5ea8e483b2\" xlink:type=\"arc\" order=\"12\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SharesIssued_def54f91-fdf4-4a09-9eaa-32c0248c628c\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesIssued\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StockholdersEquity_c158881d-4f73-4d39-82e7-fad433d5ff2c\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_SharesHeldInTrustForDeferredCompensationPlan_d5f5b1f0-eb20-42cb-8a17-4b1a20651ba8\" xlink:href=\"cpk-20230930.xsd#cpk_SharesHeldInTrustForDeferredCompensationPlan\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_StatementLineItems_50dfb789-8c36-4c92-823e-b7c6af3eef6a\" xlink:to=\"loc_cpk_SharesHeldInTrustForDeferredCompensationPlan_d5f5b1f0-eb20-42cb-8a17-4b1a20651ba8\" xlink:type=\"arc\" order=\"4\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_1cd05e01-c38b-46e8-baa5-0f1dd42e2981\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_StatementLineItems_50dfb789-8c36-4c92-823e-b7c6af3eef6a\" xlink:to=\"loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_1cd05e01-c38b-46e8-baa5-0f1dd42e2981\" xlink:type=\"arc\" order=\"5\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StatementTable_fddc5256-8ee3-4b93-93c4-48bb656590fe\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/all\" xlink:from=\"loc_us-gaap_StatementLineItems_50dfb789-8c36-4c92-823e-b7c6af3eef6a\" xlink:to=\"loc_us-gaap_StatementTable_fddc5256-8ee3-4b93-93c4-48bb656590fe\" xlink:type=\"arc\" order=\"1\" xbrldt:closed=\"true\" xbrldt:contextElement=\"segment\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StatementEquityComponentsAxis_dd5c284c-ed85-42db-b6b6-0cfb11c89f81\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/hypercube-dimension\" xlink:from=\"loc_us-gaap_StatementTable_fddc5256-8ee3-4b93-93c4-48bb656590fe\" xlink:to=\"loc_us-gaap_StatementEquityComponentsAxis_dd5c284c-ed85-42db-b6b6-0cfb11c89f81\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_EquityComponentDomain_dd5c284c-ed85-42db-b6b6-0cfb11c89f81_default\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/dimension-default\" xlink:from=\"loc_us-gaap_StatementEquityComponentsAxis_dd5c284c-ed85-42db-b6b6-0cfb11c89f81\" xlink:to=\"loc_us-gaap_EquityComponentDomain_dd5c284c-ed85-42db-b6b6-0cfb11c89f81_default\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/dimension-domain\" xlink:from=\"loc_us-gaap_StatementEquityComponentsAxis_dd5c284c-ed85-42db-b6b6-0cfb11c89f81\" xlink:to=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CommonStockMember_99ad8d81-2d16-4635-a7e6-d0f98ee5b65a\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:to=\"loc_us-gaap_CommonStockMember_99ad8d81-2d16-4635-a7e6-d0f98ee5b65a\" xlink:type=\"arc\" order=\"0\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_AdditionalPaidInCapitalMember_b51dcfe2-076d-4c9e-aa27-314a59acc4e6\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapitalMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:to=\"loc_us-gaap_AdditionalPaidInCapitalMember_b51dcfe2-076d-4c9e-aa27-314a59acc4e6\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_RetainedEarningsMember_9d30f9cd-dcd2-40ce-853e-b1c3e6762f0a\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:to=\"loc_us-gaap_RetainedEarningsMember_9d30f9cd-dcd2-40ce-853e-b1c3e6762f0a\" xlink:type=\"arc\" order=\"2\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_a70c3255-0abb-47c1-8c84-4812eef2303f\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:to=\"loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_a70c3255-0abb-47c1-8c84-4812eef2303f\" xlink:type=\"arc\" order=\"3\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_DeferredCompensationShareBasedPaymentsMember_073ed179-d4e5-4a06-a81e-6ef430611762\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredCompensationShareBasedPaymentsMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:to=\"loc_us-gaap_DeferredCompensationShareBasedPaymentsMember_073ed179-d4e5-4a06-a81e-6ef430611762\" xlink:type=\"arc\" order=\"4\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_TreasuryStockMember_d1a108a8-d594-4ab0-85ae-6366d1909bb9\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:to=\"loc_us-gaap_TreasuryStockMember_d1a108a8-d594-4ab0-85ae-6366d1909bb9\" xlink:type=\"arc\" order=\"5\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_TreasuryStockPreferredMember_fd72f477-587c-4a16-bf11-ec5112d80240\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockPreferredMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:to=\"loc_us-gaap_TreasuryStockPreferredMember_fd72f477-587c-4a16-bf11-ec5112d80240\" xlink:type=\"arc\" order=\"6\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_TreasuryStockCommonMember_437503f8-4335-4258-8ce9-b4130438f334\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_EquityComponentDomain_7b8c4abc-960e-49a3-be7d-75137788cfab\" xlink:to=\"loc_us-gaap_TreasuryStockCommonMember_437503f8-4335-4258-8ce9-b4130438f334\" xlink:type=\"arc\" order=\"7\"/>\n  </link:definitionLink>\n  </link:linkbase>\n\n\n##Label linkbase document\n<?xml version='1.0' encoding='UTF-8'?>\n<link:linkbase xmlns:link=\"http://www.xbrl.org/2003/linkbase\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd\"><link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedPeriodStartLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/netLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedNetLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedTerseLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedPeriodEndLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedTotalLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel\"/>\n  <link:labelLink xlink:role=\"http://www.xbrl.org/2003/role/link\" xlink:type=\"extended\"><link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\" xlink:to=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_41c918c9-453b-4f26-ab5a-80ec7ea7b2cf_terseLabel_en-US\" xlink:label=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation</link:label>\n    <link:label id=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_78a5541d-5ef3-4d78-af21-0bbcf788f460_verboseLabel_en-US\" xlink:label=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\" xlink:role=\"http://www.xbrl.org/2003/role/verboseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Shares issued under the performance incentive plan withheld for employee taxes (shares)</link:label>\n    <link:label id=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_fa83be9b-07bb-4370-b6dd-522d5f13da2b_netLabel_en-US\" xlink:label=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\" xlink:role=\"http://www.xbrl.org/2009/role/netLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation</link:label>\n    <link:label id=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_label_en-US\" xlink:label=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CommonStockDividendsPerShareDeclared\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockDividendsPerShareDeclared\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_CommonStockDividendsPerShareDeclared\" xlink:to=\"lab_us-gaap_CommonStockDividendsPerShareDeclared\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_CommonStockDividendsPerShareDeclared_fb5352cd-dbd7-45fc-8ac5-e855f7b7be60_terseLabel_en-US\" xlink:label=\"lab_us-gaap_CommonStockDividendsPerShareDeclared\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Common Stock, Dividends, Per Share, Declared</link:label>\n    <link:label id=\"lab_us-gaap_CommonStockDividendsPerShareDeclared_61eea892-de4c-4bfb-b182-d4c69906b00d_verboseLabel_en-US\" xlink:label=\"lab_us-gaap_CommonStockDividendsPerShareDeclared\" xlink:role=\"http://www.xbrl.org/2003/role/verboseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Dividend declared (in dollars per share)</link:label>\n    <link:label id=\"lab_us-gaap_CommonStockDividendsPerShareDeclared_label_en-US\" xlink:label=\"lab_us-gaap_CommonStockDividendsPerShareDeclared\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Common Stock, Dividends, Per Share, Declared</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StatementOfStockholdersEquityAbstract\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementOfStockholdersEquityAbstract\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_StatementOfStockholdersEquityAbstract\" xlink:to=\"lab_us-gaap_StatementOfStockholdersEquityAbstract\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_StatementOfStockholdersEquityAbstract_4d59dcca-010f-460f-9b35-5bc095e822a6_terseLabel_en-US\" xlink:label=\"lab_us-gaap_StatementOfStockholdersEquityAbstract\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Statement of Stockholders' Equity [Abstract]</link:label>\n    <link:label id=\"lab_us-gaap_StatementOfStockholdersEquityAbstract_label_en-US\" xlink:label=\"lab_us-gaap_StatementOfStockholdersEquityAbstract\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Statement of Stockholders' Equity [Abstract]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_TreasuryStockMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_TreasuryStockMember\" xlink:to=\"lab_us-gaap_TreasuryStockMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_TreasuryStockMember_7d087758-41da-479a-8cc9-e8c169aa8c11_terseLabel_en-US\" xlink:label=\"lab_us-gaap_TreasuryStockMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Treasury Stock [Member]</link:label>\n    <link:label id=\"lab_us-gaap_TreasuryStockMember_label_en-US\" xlink:label=\"lab_us-gaap_TreasuryStockMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Treasury Stock [Member] (Deprecated 2023)</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_TreasuryStockPreferredMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockPreferredMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_TreasuryStockPreferredMember\" xlink:to=\"lab_us-gaap_TreasuryStockPreferredMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_TreasuryStockPreferredMember_cc28daec-f590-484e-a33a-9b28115fa2e7_terseLabel_en-US\" xlink:label=\"lab_us-gaap_TreasuryStockPreferredMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Treasury Stock, Preferred</link:label>\n    <link:label id=\"lab_us-gaap_TreasuryStockPreferredMember_label_en-US\" xlink:label=\"lab_us-gaap_TreasuryStockPreferredMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Treasury Stock, Preferred [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_NetIncomeLoss\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_NetIncomeLoss\" xlink:to=\"lab_us-gaap_NetIncomeLoss\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_NetIncomeLoss_46e21d4a-1b0a-49f4-8513-4355c6bd5e89_totalLabel_en-US\" xlink:label=\"lab_us-gaap_NetIncomeLoss\" xlink:role=\"http://www.xbrl.org/2003/role/totalLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Net Income</link:label>\n    <link:label id=\"lab_us-gaap_NetIncomeLoss_0151eb14-1852-49cf-9d5e-2f174ac94cbc_terseLabel_en-US\" xlink:label=\"lab_us-gaap_NetIncomeLoss\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Net Income</link:label>\n    <link:label id=\"lab_us-gaap_NetIncomeLoss_label_en-US\" xlink:label=\"lab_us-gaap_NetIncomeLoss\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Net Income (Loss)</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_AcceleratedVestedSharesMember\" xlink:href=\"cpk-20230930.xsd#cpk_AcceleratedVestedSharesMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_cpk_AcceleratedVestedSharesMember\" xlink:to=\"lab_cpk_AcceleratedVestedSharesMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_cpk_AcceleratedVestedSharesMember_4c86971d-e1ae-4c34-a95a-20e571a1eaf0_terseLabel_en-US\" xlink:label=\"lab_cpk_AcceleratedVestedSharesMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Accelerated Vested Shares [Member]</link:label>\n    <link:label id=\"lab_cpk_AcceleratedVestedSharesMember_label_en-US\" xlink:label=\"lab_cpk_AcceleratedVestedSharesMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Accelerated Vested Shares [Member]</link:label>\n    <link:label id=\"lab_cpk_AcceleratedVestedSharesMember_documentation_en-US\" xlink:label=\"lab_cpk_AcceleratedVestedSharesMember\" xlink:role=\"http://www.xbrl.org/2003/role/documentation\" xlink:type=\"resource\" xml:lang=\"en-US\">Accelerated Vested Shares [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_Dividends\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Dividends\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_Dividends\" xlink:to=\"lab_us-gaap_Dividends\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_Dividends_253c550b-8f29-4744-bc04-8883fd9f3750_negatedTerseLabel_en-US\" xlink:label=\"lab_us-gaap_Dividends\" xlink:role=\"http://www.xbrl.org/2009/role/negatedTerseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Dividend declared</link:label>\n    <link:label id=\"lab_us-gaap_Dividends_label_en-US\" xlink:label=\"lab_us-gaap_Dividends\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Dividends</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CommonStockMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_CommonStockMember\" xlink:to=\"lab_us-gaap_CommonStockMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_CommonStockMember_0b5e9e0c-8332-4a06-a481-c3f6232f75d6_terseLabel_en-US\" xlink:label=\"lab_us-gaap_CommonStockMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Common Stock [Member]</link:label>\n    <link:label id=\"lab_us-gaap_CommonStockMember_label_en-US\" xlink:label=\"lab_us-gaap_CommonStockMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Common Stock [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_RetainedEarningsMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_RetainedEarningsMember\" xlink:to=\"lab_us-gaap_RetainedEarningsMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_RetainedEarningsMember_7457a0a8-7772-43b2-b19c-f69ebb02ff48_terseLabel_en-US\" xlink:label=\"lab_us-gaap_RetainedEarningsMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Retained Earnings [Member]</link:label>\n    <link:label id=\"lab_us-gaap_RetainedEarningsMember_label_en-US\" xlink:label=\"lab_us-gaap_RetainedEarningsMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Retained Earnings [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_AdditionalPaidInCapitalMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapitalMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_AdditionalPaidInCapitalMember\" xlink:to=\"lab_us-gaap_AdditionalPaidInCapitalMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_AdditionalPaidInCapitalMember_fa1decf5-667a-4f20-aa33-e23f95bb5820_verboseLabel_en-US\" xlink:label=\"lab_us-gaap_AdditionalPaidInCapitalMember\" xlink:role=\"http://www.xbrl.org/2003/role/verboseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Additional Paid-In Capital [Member]</link:label>\n    <link:label id=\"lab_us-gaap_AdditionalPaidInCapitalMember_f71df71a-fbc6-4a6c-a5e9-40ac9690bf59_terseLabel_en-US\" xlink:label=\"lab_us-gaap_AdditionalPaidInCapitalMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Additional Paid-in Capital [Member]</link:label>\n    <link:label id=\"lab_us-gaap_AdditionalPaidInCapitalMember_label_en-US\" xlink:label=\"lab_us-gaap_AdditionalPaidInCapitalMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Additional Paid-in Capital [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_EquityComponentDomain\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_EquityComponentDomain\" xlink:to=\"lab_us-gaap_EquityComponentDomain\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_EquityComponentDomain_33b41b3d-a6c9-4fbc-90a2-6d47e9ef1e5b_terseLabel_en-US\" xlink:label=\"lab_us-gaap_EquityComponentDomain\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Equity Component [Domain]</link:label>\n    <link:label id=\"lab_us-gaap_EquityComponentDomain_label_en-US\" xlink:label=\"lab_us-gaap_EquityComponentDomain\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Equity Component [Domain]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_PreferredStockParOrStatedValuePerShare\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockParOrStatedValuePerShare\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_PreferredStockParOrStatedValuePerShare\" xlink:to=\"lab_us-gaap_PreferredStockParOrStatedValuePerShare\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_PreferredStockParOrStatedValuePerShare_ae64d3b9-0b5a-47ba-becf-acd1f46fca93_terseLabel_en-US\" xlink:label=\"lab_us-gaap_PreferredStockParOrStatedValuePerShare\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Preferred Stock, Par or Stated Value Per Share</link:label>\n    <link:label id=\"lab_us-gaap_PreferredStockParOrStatedValuePerShare_label_en-US\" xlink:label=\"lab_us-gaap_PreferredStockParOrStatedValuePerShare\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Preferred Stock, Par or Stated Value Per Share</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember\" xlink:to=\"lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_5d9996cc-72bb-4c82-bc83-8843a168710f_verboseLabel_en-US\" xlink:label=\"lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember\" xlink:role=\"http://www.xbrl.org/2003/role/verboseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Accumulated Other Comprehensive Loss [Member]</link:label>\n    <link:label id=\"lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_29b0a832-55c9-44a2-abff-84b7438ae715_terseLabel_en-US\" xlink:label=\"lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">AOCI Attributable to Parent [Member]</link:label>\n    <link:label id=\"lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_label_en-US\" xlink:label=\"lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">AOCI Attributable to Parent [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_DeferredCompensationShareBasedPaymentsMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredCompensationShareBasedPaymentsMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_DeferredCompensationShareBasedPaymentsMember\" xlink:to=\"lab_us-gaap_DeferredCompensationShareBasedPaymentsMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_DeferredCompensationShareBasedPaymentsMember_d2c7c469-dd1c-427d-b56e-f9991e49ec03_terseLabel_en-US\" xlink:label=\"lab_us-gaap_DeferredCompensationShareBasedPaymentsMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Deferred Compensation [Member]</link:label>\n    <link:label id=\"lab_us-gaap_DeferredCompensationShareBasedPaymentsMember_label_en-US\" xlink:label=\"lab_us-gaap_DeferredCompensationShareBasedPaymentsMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Deferred Compensation, Share-Based Payments [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SharesIssued\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesIssued\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_SharesIssued\" xlink:to=\"lab_us-gaap_SharesIssued\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_SharesIssued_aee9e2a3-5621-4584-b6d1-ca4681ca85c8_periodStartLabel_en-US\" xlink:label=\"lab_us-gaap_SharesIssued\" xlink:role=\"http://www.xbrl.org/2003/role/periodStartLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Beginning Balances (shares)</link:label>\n    <link:label id=\"lab_us-gaap_SharesIssued_f07dc3e7-5aa3-4cb3-a4a0-0cd7c9636011_periodEndLabel_en-US\" xlink:label=\"lab_us-gaap_SharesIssued\" xlink:role=\"http://www.xbrl.org/2003/role/periodEndLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Ending Balances (shares)</link:label>\n    <link:label id=\"lab_us-gaap_SharesIssued_label_en-US\" xlink:label=\"lab_us-gaap_SharesIssued\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Shares, Issued</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation\" xlink:to=\"lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_fef5b83e-5a65-4c71-b857-89e9a30ceac4_terseLabel_en-US\" xlink:label=\"lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Share-based compensation and tax benefit</link:label>\n    <link:label id=\"lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_label_en-US\" xlink:label=\"lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_SharesHeldInTrustForDeferredCompensationPlan\" xlink:href=\"cpk-20230930.xsd#cpk_SharesHeldInTrustForDeferredCompensationPlan\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_cpk_SharesHeldInTrustForDeferredCompensationPlan\" xlink:to=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan_af027d37-10df-4503-a7f6-b91878c1b787_terseLabel_en-US\" xlink:label=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Shares Held In Trust For Deferred Compensation Plan</link:label>\n    <link:label id=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan_f73d5299-8404-49d2-b4c8-f3bb6b13e355_verboseLabel_en-US\" xlink:label=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan\" xlink:role=\"http://www.xbrl.org/2003/role/verboseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Deferred compensation plan held Rabbi Trust (shares)</link:label>\n    <link:label id=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan_label_en-US\" xlink:label=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Shares Held In Trust For Deferred Compensation Plan</link:label>\n    <link:label id=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan_documentation_en-US\" xlink:label=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan\" xlink:role=\"http://www.xbrl.org/2003/role/documentation\" xlink:type=\"resource\" xml:lang=\"en-US\">Deferred compensation plan held Rabbi Trust.</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StockholdersEquity\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_StockholdersEquity\" xlink:to=\"lab_us-gaap_StockholdersEquity\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_StockholdersEquity_d83aabc9-7efa-494a-900f-63b86b7ae7df_totalLabel_en-US\" xlink:label=\"lab_us-gaap_StockholdersEquity\" xlink:role=\"http://www.xbrl.org/2003/role/totalLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Total stockholders\u2019 equity</link:label>\n    <link:label id=\"lab_us-gaap_StockholdersEquity_1f789bbb-e852-4af7-be7f-874148bf1a0f_terseLabel_en-US\" xlink:label=\"lab_us-gaap_StockholdersEquity\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Stockholders' Equity Attributable to Parent</link:label>\n    <link:label id=\"lab_us-gaap_StockholdersEquity_e657d21b-b640-4426-abaf-59a5f886f6c2_periodStartLabel_en-US\" xlink:label=\"lab_us-gaap_StockholdersEquity\" xlink:role=\"http://www.xbrl.org/2003/role/periodStartLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Beginning Balances</link:label>\n    <link:label id=\"lab_us-gaap_StockholdersEquity_766ff073-289e-491d-8973-5e008fdf13fe_periodEndLabel_en-US\" xlink:label=\"lab_us-gaap_StockholdersEquity\" xlink:role=\"http://www.xbrl.org/2003/role/periodEndLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Ending Balances</link:label>\n    <link:label id=\"lab_us-gaap_StockholdersEquity_label_en-US\" xlink:label=\"lab_us-gaap_StockholdersEquity\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Equity, Attributable to Parent</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_PreferredStockSharesAuthorized\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockSharesAuthorized\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_PreferredStockSharesAuthorized\" xlink:to=\"lab_us-gaap_PreferredStockSharesAuthorized\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_PreferredStockSharesAuthorized_7ba06f98-2c1d-4507-b55a-5ff4407c5940_terseLabel_en-US\" xlink:label=\"lab_us-gaap_PreferredStockSharesAuthorized\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Preferred Stock, Shares Authorized</link:label>\n    <link:label id=\"lab_us-gaap_PreferredStockSharesAuthorized_label_en-US\" xlink:label=\"lab_us-gaap_PreferredStockSharesAuthorized\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Preferred Stock, Shares Authorized</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StatementTable\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_StatementTable\" xlink:to=\"lab_us-gaap_StatementTable\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_StatementTable_663cf1f3-cb1e-4bc3-aa93-74322eb6f2aa_terseLabel_en-US\" xlink:label=\"lab_us-gaap_StatementTable\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Statement [Table]</link:label>\n    <link:label id=\"lab_us-gaap_StatementTable_label_en-US\" xlink:label=\"lab_us-gaap_StatementTable\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Statement [Table]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_AwardTypeAxis\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_AwardTypeAxis\" xlink:to=\"lab_us-gaap_AwardTypeAxis\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_AwardTypeAxis_a674fa2a-5b86-4054-b3f8-2e655e8eada1_terseLabel_en-US\" xlink:label=\"lab_us-gaap_AwardTypeAxis\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Award Type [Axis]</link:label>\n    <link:label id=\"lab_us-gaap_AwardTypeAxis_label_en-US\" xlink:label=\"lab_us-gaap_AwardTypeAxis\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Award Type [Axis]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StatementEquityComponentsAxis\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_StatementEquityComponentsAxis\" xlink:to=\"lab_us-gaap_StatementEquityComponentsAxis\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_StatementEquityComponentsAxis_128ba7a3-b5a4-40b9-80f4-4d65f3452c69_terseLabel_en-US\" xlink:label=\"lab_us-gaap_StatementEquityComponentsAxis\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Equity Components [Axis]</link:label>\n    <link:label id=\"lab_us-gaap_StatementEquityComponentsAxis_label_en-US\" xlink:label=\"lab_us-gaap_StatementEquityComponentsAxis\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Equity Components [Axis]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan\" xlink:href=\"cpk-20230930.xsd#cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan\" xlink:to=\"lab_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan_49509aed-e3df-43b5-b528-d66c637b0af4_terseLabel_en-US\" xlink:label=\"lab_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan</link:label>\n    <link:label id=\"lab_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan_label_en-US\" xlink:label=\"lab_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan</link:label>\n    <link:label id=\"lab_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan_documentation_en-US\" xlink:label=\"lab_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan\" xlink:role=\"http://www.xbrl.org/2003/role/documentation\" xlink:type=\"resource\" xml:lang=\"en-US\">Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_TreasuryStockCommonMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_TreasuryStockCommonMember\" xlink:to=\"lab_us-gaap_TreasuryStockCommonMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_TreasuryStockCommonMember_9c05e6d4-edcb-4530-8dbe-7a642fecd932_terseLabel_en-US\" xlink:label=\"lab_us-gaap_TreasuryStockCommonMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Treasury Stock, Common</link:label>\n    <link:label id=\"lab_us-gaap_TreasuryStockCommonMember_label_en-US\" xlink:label=\"lab_us-gaap_TreasuryStockCommonMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Treasury Stock, Common [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember\" xlink:href=\"cpk-20230930.xsd#cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember\" xlink:to=\"lab_cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember_6d921dc6-9b86-4b61-a4b1-7475516496cf_terseLabel_en-US\" xlink:label=\"lab_cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Accumulated (Gain) Loss from Interest Rate Swap Cash Flows Hedges [Member]</link:label>\n    <link:label id=\"lab_cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember_label_en-US\" xlink:label=\"lab_cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Accumulated (Gain) Loss from Interest Rate Swap Cash Flows Hedges [Member]</link:label>\n    <link:label id=\"lab_cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember_documentation_en-US\" xlink:label=\"lab_cpk_AccumulatedGainLossfromInterestRateSwapCashFl\n\n##Instance document\n<?xml version='1.0' encoding='UTF-8'?>\n<xbrl xmlns=\"http://www.xbrl.org/2003/instance\" xmlns:cpk=\"http://www.chpk.com/20230930\" xmlns:dei=\"http://xbrl.sec.gov/dei/2023\" xmlns:iso4217=\"http://www.xbrl.org/2003/iso4217\" xmlns:link=\"http://www.xbrl.org/2003/linkbase\" xmlns:srt=\"http://fasb.org/srt/2023\" xmlns:us-gaap=\"http://fasb.org/us-gaap/2023\" xmlns:utr=\"http://www.xbrl.org/2009/utr\" xmlns:xbrldi=\"http://xbrl.org/2006/xbrldi\" xmlns:xhtml=\"http://www.w3.org/1999/xhtml\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xml:lang=\"en-US\"><link:schemaRef xlink:href=\"cpk-20230930.xsd\" xlink:type=\"simple\"/>\n\t<context id=\"c-5\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n        </entity>\n        <period>\n            <startDate>2022-07-01</startDate>\n            <endDate>2022-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-6\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n        </entity>\n        <period>\n            <startDate>2022-01-01</startDate>\n            <endDate>2022-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-4\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n        </entity>\n        <period>\n            <startDate>2023-07-01</startDate>\n            <endDate>2023-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-1\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n        </entity>\n        <period>\n            <startDate>2023-01-01</startDate>\n            <endDate>2023-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-2\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n        </entity>\n        <period>\n            <instant>2023-09-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-19\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n        </entity>\n        <period>\n            <instant>2022-12-31</instant>\n        </period>\n    </context>\n\t<context id=\"c-22\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:CommonStockMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-06-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-35\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:CommonStockMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-09-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-41\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:CommonStockMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2021-12-31</instant>\n        </period>\n    </context>\n\t<context id=\"c-53\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:CommonStockMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2023-06-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-66\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:CommonStockMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2023-09-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-72\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:CommonStockMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-12-31</instant>\n        </period>\n    </context>\n\t<context id=\"c-23\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AdditionalPaidInCapitalMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-06-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-24\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:RetainedEarningsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-06-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-25\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AccumulatedOtherComprehensiveIncomeMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-06-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-26\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:DeferredCompensationShareBasedPaymentsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-06-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-27\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:TreasuryStockPreferredMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-06-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-28\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n        </entity>\n        <period>\n            <instant>2022-06-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-36\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AdditionalPaidInCapitalMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-09-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-37\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:RetainedEarningsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-09-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-38\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AccumulatedOtherComprehensiveIncomeMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-09-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-39\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:DeferredCompensationShareBasedPaymentsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-09-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-40\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:TreasuryStockCommonMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-09-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-21\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n        </entity>\n        <period>\n            <instant>2022-09-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-42\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AdditionalPaidInCapitalMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2021-12-31</instant>\n        </period>\n    </context>\n\t<context id=\"c-43\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:RetainedEarningsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2021-12-31</instant>\n        </period>\n    </context>\n\t<context id=\"c-44\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AccumulatedOtherComprehensiveIncomeMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2021-12-31</instant>\n        </period>\n    </context>\n\t<context id=\"c-45\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:DeferredCompensationShareBasedPaymentsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2021-12-31</instant>\n        </period>\n    </context>\n\t<context id=\"c-46\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:TreasuryStockCommonMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2021-12-31</instant>\n        </period>\n    </context>\n\t<context id=\"c-20\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n        </entity>\n        <period>\n            <instant>2021-12-31</instant>\n        </period>\n    </context>\n\t<context id=\"c-54\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AdditionalPaidInCapitalMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2023-06-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-55\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:RetainedEarningsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2023-06-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-56\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AccumulatedOtherComprehensiveIncomeMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2023-06-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-57\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:DeferredCompensationShareBasedPaymentsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2023-06-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-58\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:TreasuryStockCommonMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2023-06-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-59\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n        </entity>\n        <period>\n            <instant>2023-06-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-67\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AdditionalPaidInCapitalMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2023-09-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-68\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:RetainedEarningsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2023-09-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-69\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AccumulatedOtherComprehensiveIncomeMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2023-09-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-70\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:DeferredCompensationShareBasedPaymentsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2023-09-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-71\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:TreasuryStockCommonMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2023-09-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-73\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AdditionalPaidInCapitalMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-12-31</instant>\n        </period>\n    </context>\n\t<context id=\"c-74\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:RetainedEarningsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-12-31</instant>\n        </period>\n    </context>\n\t<context id=\"c-75\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AccumulatedOtherComprehensiveIncomeMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-12-31</instant>\n        </period>\n    </context>\n\t<context id=\"c-76\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:DeferredCompensationShareBasedPaymentsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-12-31</instant>\n        </period>\n    </context>\n\t<context id=\"c-77\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:TreasuryStockCommonMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2022-12-31</instant>\n        </period>\n    </context>\n\t<context id=\"c-29\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:RetainedEarningsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2022-07-01</startDate>\n            <endDate>2022-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-47\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:RetainedEarningsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2022-01-01</startDate>\n            <endDate>2022-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-60\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:RetainedEarningsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2023-07-01</startDate>\n            <endDate>2023-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-78\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:RetainedEarningsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2023-01-01</startDate>\n            <endDate>2023-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-30\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AccumulatedOtherComprehensiveIncomeMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2022-07-01</startDate>\n            <endDate>2022-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-48\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AccumulatedOtherComprehensiveIncomeMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2022-01-01</startDate>\n            <endDate>2022-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-61\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AccumulatedOtherComprehensiveIncomeMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2023-07-01</startDate>\n            <endDate>2023-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-79\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AccumulatedOtherComprehensiveIncomeMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2023-01-01</startDate>\n            <endDate>2023-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-366\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">cpk:AOCIChangesForDefinedBenefitPensionAndPostretirementPlansMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2023-01-01</startDate>\n            <endDate>2023-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-9\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">cpk:AccumulatedGainLossfromCommodityContractsCashFlowsHedgesMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2023-01-01</startDate>\n            <endDate>2023-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-13\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">cpk:AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2023-01-01</startDate>\n            <endDate>2023-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-373\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">cpk:AOCIChangesForDefinedBenefitPensionAndPostretirementPlansMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2022-01-01</startDate>\n            <endDate>2022-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-10\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">cpk:AccumulatedGainLossfromCommodityContractsCashFlowsHedgesMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2022-01-01</startDate>\n            <endDate>2022-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-14\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">cpk:AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2022-01-01</startDate>\n            <endDate>2022-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-31\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:CommonStockMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2022-07-01</startDate>\n            <endDate>2022-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-49\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:CommonStockMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2022-01-01</startDate>\n            <endDate>2022-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-62\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:CommonStockMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2023-07-01</startDate>\n            <endDate>2023-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-80\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:CommonStockMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2023-01-01</startDate>\n            <endDate>2023-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-32\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AdditionalPaidInCapitalMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2022-07-01</startDate>\n            <endDate>2022-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-50\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AdditionalPaidInCapitalMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2022-01-01</startDate>\n            <endDate>2022-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-63\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AdditionalPaidInCapitalMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2023-07-01</startDate>\n            <endDate>2023-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-81\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:AdditionalPaidInCapitalMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2023-01-01</startDate>\n            <endDate>2023-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-33\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:DeferredCompensationShareBasedPaymentsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2022-07-01</startDate>\n            <endDate>2022-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-34\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:TreasuryStockCommonMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2022-07-01</startDate>\n            <endDate>2022-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-51\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:DeferredCompensationShareBasedPaymentsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2022-01-01</startDate>\n            <endDate>2022-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-52\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:TreasuryStockCommonMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2022-01-01</startDate>\n            <endDate>2022-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-64\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:DeferredCompensationShareBasedPaymentsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2023-07-01</startDate>\n            <endDate>2023-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-65\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:TreasuryStockCommonMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2023-07-01</startDate>\n            <endDate>2023-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-82\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:DeferredCompensationShareBasedPaymentsMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2023-01-01</startDate>\n            <endDate>2023-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-83\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:TreasuryStockCommonMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2023-01-01</startDate>\n            <endDate>2023-09-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-395\">\n        <entity>\n            <identifier scheme=\"h\n\n##US GAAP Taxonomy\nNone\n\nQuestion: What erroneous relationship type exists between StatementEquityComponentsAxis and TreasuryStockMember, based on the provided XBRL filing and the US GAAP taxonomy?\nAnswer:\n\n    "

Answer: "CombinationErr"