| 
                 
                    Closing price on 5/16/2007
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    34.40 | 
                 
                
                    | High | 
                    35.50 | 
                 
                
                    | Low | 
                    34.00 | 
                     
                
                    | Volume | 
                    4,500 | 
                                 
                
                    | Split-adjusted Price | 
                    2.73 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
STP Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                5/16/2007
             | 
            
                -3.30 / -8.80%
             |             
            
                34.40
             |           
            
                35.50
             |               
            
                34.00
             |                           
            
                34.20
             | 
            
                34.20
             |                     
            
                2.73
             |                                 
            
                4,500
             |            
            
                 
             |                                       
         
    
        
            | 
                5/15/2007
             | 
            
                -2.50 / -6.25%
             |             
            
                37.70
             |           
            
                40.00
             |               
            
                37.00
             |                           
            
                37.50
             | 
            
                37.50
             |                     
            
                2.99
             |                                 
            
                2,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/14/2007
             | 
            
                +2.00 / +5.26%
             |             
            
                39.40
             |           
            
                40.00
             |               
            
                39.40
             |                           
            
                40.00
             | 
            
                40.00
             |                     
            
                3.19
             |                                 
            
                5,000
             |            
            
                 
             |                                       
         
    
        
            | 
                5/11/2007
             | 
            
                -1.00 / -2.56%
             |             
            
                39.00
             |           
            
                40.00
             |               
            
                38.00
             |                           
            
                38.00
             | 
            
                38.00
             |                     
            
                3.03
             |                                 
            
                1,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/10/2007
             | 
            
                0.00 / 0.00%
             |             
            
                39.00
             |           
            
                39.00
             |               
            
                39.00
             |                           
            
                39.00
             | 
            
                39.00
             |                     
            
                3.11
             |                                 
            
                1,000
             |            
            
                 
             |                                       
         
    
        
            | 
                5/9/2007
             | 
            
                -0.80 / -2.01%
             |             
            
                40.00
             |           
            
                44.00
             |               
            
                39.00
             |                           
            
                39.00
             | 
            
                39.00
             |                     
            
                3.11
             |                                 
            
                4,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/8/2007
             | 
            
                +0.80 / +2.05%
             |             
            
                39.80
             |           
            
                40.00
             |               
            
                39.80
             |                           
            
                39.80
             | 
            
                39.80
             |                     
            
                3.17
             |                                 
            
                3,900
             |            
            
                 
             |                                       
         
    
        
            | 
                5/7/2007
             | 
            
                +0.10 / +0.26%
             |             
            
                38.20
             |           
            
                39.00
             |               
            
                38.00
             |                           
            
                39.00
             | 
            
                39.00
             |                     
            
                3.11
             |                                 
            
                600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/4/2007
             | 
            
                -0.40 / -1.02%
             |             
            
                38.90
             |           
            
                39.00
             |               
            
                38.80
             |                           
            
                38.90
             | 
            
                38.90
             |                     
            
                3.10
             |                                 
            
                1,200
             |            
            
                 
             |                                       
         
    
        
            | 
                5/3/2007
             | 
            
                +0.30 / +0.77%
             |             
            
                39.30
             |           
            
                39.30
             |               
            
                39.30
             |                           
            
                39.30
             | 
            
                39.30
             |                     
            
                3.13
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/2/2007
             | 
            
                0.00 / 0.00%
             |             
            
                39.00
             |           
            
                39.50
             |               
            
                39.00
             |                           
            
                39.00
             | 
            
                39.00
             |                     
            
                3.11
             |                                 
            
                600
             |            
            
                 
             |                                       
         
    
        
            | 
                4/25/2007
             | 
            
                +3.00 / +8.33%
             |             
            
                38.80
             |           
            
                39.00
             |               
            
                38.80
             |                           
            
                39.00
             | 
            
                39.00
             |                     
            
                3.11
             |                                 
            
                2,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/24/2007
             | 
            
                +0.50 / +1.41%
             |             
            
                36.00
             |           
            
                36.00
             |               
            
                36.00
             |                           
            
                36.00
             | 
            
                36.00
             |                     
            
                2.87
             |                                 
            
                1,000
             |            
            
                 
             |                                       
         
    
        
            | 
                4/23/2007
             | 
            
                -1.60 / -4.31%
             |             
            
                34.90
             |           
            
                35.50
             |               
            
                34.50
             |                           
            
                35.50
             | 
            
                35.50
             |                     
            
                2.83
             |                                 
            
                5,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/20/2007
             | 
            
                -0.90 / -2.37%
             |             
            
                37.90
             |           
            
                40.50
             |               
            
                37.00
             |                           
            
                37.10
             | 
            
                37.10
             |                     
            
                2.96
             |                                 
            
                3,000
             |            
            
                 
             |                                       
         
    
        
            | 
                4/19/2007
             | 
            
                -0.50 / -1.30%
             |             
            
                38.00
             |           
            
                41.80
             |               
            
                38.00
             |                           
            
                38.00
             | 
            
                38.00
             |                     
            
                3.03
             |                                 
            
                3,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/18/2007
             | 
            
                +3.40 / +9.69%
             |             
            
                35.20
             |           
            
                38.50
             |               
            
                35.20
             |                           
            
                38.50
             | 
            
                38.50
             |                     
            
                3.07
             |                                 
            
                700
             |            
            
                 
             |                                       
         
    
        
            | 
                4/17/2007
             | 
            
                -2.40 / -6.40%
             |             
            
                35.20
             |           
            
                36.00
             |               
            
                35.10
             |                           
            
                35.10
             | 
            
                35.10
             |                     
            
                2.80
             |                                 
            
                7,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/16/2007
             | 
            
                -4.50 / -10.71%
             |             
            
                39.00
             |           
            
                41.10
             |               
            
                37.50
             |                           
            
                37.50
             | 
            
                37.50
             |                     
            
                2.99
             |                                 
            
                3,200
             |            
            
                 
             |                                       
         
    
        
            | 
                4/13/2007
             | 
            
                -0.50 / -1.18%
             |             
            
                41.60
             |           
            
                42.00
             |               
            
                41.00
             |                           
            
                42.00
             | 
            
                42.00
             |                     
            
                3.35
             |                                 
            
                1,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/12/2007
             | 
            
                +1.50 / +3.66%
             |             
            
                40.90
             |           
            
                44.00
             |               
            
                40.00
             |                           
            
                42.50
             | 
            
                42.50
             |                     
            
                3.39
             |                                 
            
                8,300
             |            
            
                 
             |                                       
         
    
        
            | 
                4/11/2007
             | 
            
                +1.00 / +2.50%
             |             
            
                40.20
             |           
            
                42.00
             |               
            
                40.20
             |                           
            
                41.00
             | 
            
                41.00
             |                     
            
                3.27
             |                                 
            
                7,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/10/2007
             | 
            
                0.00 / 0.00%
             |             
            
                39.80
             |           
            
                40.00
             |               
            
                39.80
             |                           
            
                40.00
             | 
            
                40.00
             |                     
            
                3.19
             |                                 
            
                1,300
             |            
            
                 
             |                                       
         
    
        
            | 
                4/9/2007
             | 
            
                -2.20 / -5.21%
             |             
            
                39.60
             |           
            
                42.20
             |               
            
                39.00
             |                           
            
                40.00
             | 
            
                40.00
             |                     
            
                3.19
             |                                 
            
                4,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/6/2007
             | 
            
                +0.10 / +0.24%
             |             
            
                42.00
             |           
            
                43.00
             |               
            
                40.00
             |                           
            
                42.20
             | 
            
                42.20
             |                     
            
                3.36
             |                                 
            
                1,300
             |            
            
                 
             |                                       
         
    
        
            | 
                4/5/2007
             | 
            
                -2.50 / -5.61%
             |             
            
                42.40
             |           
            
                46.00
             |               
            
                42.10
             |                           
            
                42.10
             | 
            
                42.10
             |                     
            
                3.36
             |                                 
            
                1,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/4/2007
             | 
            
                0.00 / 0.00%
             |             
            
                42.40
             |           
            
                44.60
             |               
            
                40.20
             |                           
            
                44.60
             | 
            
                44.60
             |                     
            
                3.56
             |                                 
            
                4,600
             |            
            
                 
             |                                       
         
    
        
            | 
                4/3/2007
             | 
            
                -1.90 / -4.09%
             |             
            
                44.60
             |           
            
                44.60
             |               
            
                44.60
             |                           
            
                44.60
             | 
            
                44.60
             |                     
            
                3.56
             |                                 
            
                300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/2/2007
             | 
            
                +0.50 / +1.09%
             |             
            
                46.10
             |           
            
                48.00
             |               
            
                42.10
             |                           
            
                46.50
             | 
            
                46.50
             |                     
            
                3.71
             |                                 
            
                2,900
             |            
            
                 
             |                                       
         
    
        
            | 
                3/30/2007
             | 
            
                +3.40 / +7.98%
             |             
            
                46.00
             |           
            
                46.80
             |               
            
                46.00
             |                           
            
                46.00
             | 
            
                46.00
             |                     
            
                3.67
             |                                 
            
                14,200
             |  
            
                 
             |                                                              
             
    
         
    
    
 |