Help with transforming (cleaning?) data from an odd source

yeah, that is a beast.

 Your "24:00"  made me chuckle.  Haven't seen that in a looong time.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("bZDBbsMgEER/ZeVeIwV2iUt6cxMnsUSM5OCqkuX//40EPLg1ygE9hmF3FqapomqXlrJ71tj/X/GcN2fzbqoeoQmd7186+NC4F1l9KRWpQQYFNAsVfAVfwVfJj71Pp5Hu/jw6T75viVIqcX1IJNILjUAfFwp8k30GLViv019c87hR21+H5qcd1gSLSkIlfy7UIBvonAhtFHxeJ4gpzt/ID99doA8duyJFowqayBYaaYKukjXusazvLVL4r4u2RUqu0vL+TVyDurhvU8p9dKG7uPZ3k8J1Mbvk6uP2p/JPZl9k+2PC1Tw/AQ==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Column1 = _t, Column2 = _t, Column3 = _t, Column4 = _t, Column5 = _t, Column6 = _t, Column7 = _t, Column8 = _t, Column9 = _t, Column10 = _t, Column11 = _t]),
    #"Transposed Table" = Table.Transpose(Source),
    #"Removed Top Rows" = Table.Skip(#"Transposed Table",2),
    #"Changed Type" = Table.TransformColumnTypes(#"Removed Top Rows",{{"Column1", type datetime}}),
    #"Filled Down" = Table.FillDown(#"Changed Type",{"Column1"}),
    #"Replaced Value" = Table.ReplaceValue(#"Filled Down",each [Column1],each Text.From(try [Column1] + Duration.FromText([Column2]) otherwise [Column1] + #duration(1,0,0,0)),Replacer.ReplaceValue,{"Column1"}),
    LZ = List.Zip({Table.ColumnNames(Source),List.FirstN(#"Transposed Table"[Column2],2) & #"Replaced Value"[Column1]}),
    #"Replaced Column Names" = Table.RenameColumns(Source,LZ),
    #"Removed Top Rows1" = Table.Skip(#"Replaced Column Names",2),
    #"Unpivoted Other Columns" = Table.UnpivotOtherColumns(#"Removed Top Rows1", {"STATION", "TOTAL"}, "Timestamp", "Value"),
    #"Changed Type1" = Table.TransformColumnTypes(#"Unpivoted Other Columns",{{"TOTAL", Int64.Type}, {"Timestamp", type datetime}, {"Value", Int64.Type}})
in
    #"Changed Type1"

How to use this code: Create a new Blank Query. Click on "Advanced Editor". Replace the code in the window with the code provided here. Click "Done". Once you examined the code, replace the Source step with your own source.