Modify existing code to allow for multiple case statements

Guys

I have been working with EE members to create this code but it was advised that as my original request has been honoured that I should create a new case.

So what I would like to happen

The following i would like to happen the code needs to allow for multiple case statements

so where the code refers to Stanlow it needs to allow for variouse groups of amounts

ie  if the value is >1 < 20 then blue if the same is >20 < 40 then green  if the same is > 50 then red

Private Sub Worksheet_Change(ByVal Target As Range) 
 
 
Dim cel As Range 
For Each cel In Target 
    If Not Intersect(cel, Range("K:K,M:M")) Is Nothing Then 
        Select Case Range("M" & cel.Row).Value 
            Case "Stanlow" 
                If Range("K" & cel.Row).Value > 10 Then 
                    Range("K" & cel.Row).Interior.ColorIndex = 8 
                Else 
                    Range("K" & cel.Row).Interior.ColorIndex = xlColorIndexNone 
                End If 
            Case "Grangemouth" 
                If Range("K" & cel.Row).Value < 50 Then 
                    Range("K" & cel.Row).Interior.ColorIndex = 6 
                Else 
                    Range("K" & cel.Row).Interior.ColorIndex = xlColorIndexNone 
                End If 
        End Select 
    End If 
Next cel 
End Sub

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