| 
                 
                    Closing price on 9/18/2007
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    43.00 | 
                 
                
                    | High | 
                    44.10 | 
                 
                
                    | Low | 
                    42.90 | 
                     
                
                    | Volume | 
                    171,500 | 
                                 
                
                    | Split-adjusted Price | 
                    3.59 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
STP Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                9/18/2007
             | 
            
                +3.10 / +7.56%
             |             
            
                43.00
             |           
            
                44.10
             |               
            
                42.90
             |                           
            
                44.10
             | 
            
                44.10
             |                     
            
                3.59
             |                                 
            
                171,500
             |            
            
                 
             |                                       
         
    
        
            | 
                9/17/2007
             | 
            
                +1.80 / +4.59%
             |             
            
                39.50
             |           
            
                41.00
             |               
            
                39.10
             |                           
            
                41.00
             | 
            
                41.00
             |                     
            
                3.33
             |                                 
            
                90,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/14/2007
             | 
            
                -0.30 / -0.76%
             |             
            
                40.00
             |           
            
                40.40
             |               
            
                38.50
             |                           
            
                39.20
             | 
            
                39.20
             |                     
            
                3.19
             |                                 
            
                26,300
             |            
            
                 
             |                                       
         
    
        
            | 
                9/13/2007
             | 
            
                -0.70 / -1.74%
             |             
            
                43.50
             |           
            
                44.00
             |               
            
                39.50
             |                           
            
                39.50
             | 
            
                39.50
             |                     
            
                3.21
             |                                 
            
                40,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/12/2007
             | 
            
                +3.20 / +8.65%
             |             
            
                40.20
             |           
            
                40.20
             |               
            
                39.00
             |                           
            
                40.20
             | 
            
                40.20
             |                     
            
                3.27
             |                                 
            
                74,200
             |            
            
                 
             |                                       
         
    
        
            | 
                9/11/2007
             | 
            
                +0.50 / +1.37%
             |             
            
                36.10
             |           
            
                37.00
             |               
            
                36.10
             |                           
            
                37.00
             | 
            
                37.00
             |                     
            
                3.01
             |                                 
            
                22,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/10/2007
             | 
            
                +2.00 / +5.80%
             |             
            
                34.50
             |           
            
                36.50
             |               
            
                34.50
             |                           
            
                36.50
             | 
            
                36.50
             |                     
            
                2.97
             |                                 
            
                20,800
             |            
            
                 
             |                                       
         
    
        
            | 
                9/7/2007
             | 
            
                -0.50 / -1.43%
             |             
            
                35.00
             |           
            
                35.00
             |               
            
                34.00
             |                           
            
                34.50
             | 
            
                34.50
             |                     
            
                2.81
             |                                 
            
                8,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/6/2007
             | 
            
                +0.50 / +1.45%
             |             
            
                34.00
             |           
            
                35.00
             |               
            
                33.50
             |                           
            
                35.00
             | 
            
                35.00
             |                     
            
                2.85
             |                                 
            
                2,400
             |            
            
                 
             |                                       
         
    
        
            | 
                9/5/2007
             | 
            
                -0.50 / -1.43%
             |             
            
                35.50
             |           
            
                35.50
             |               
            
                34.50
             |                           
            
                34.50
             | 
            
                34.50
             |                     
            
                2.81
             |                                 
            
                1,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/4/2007
             | 
            
                -0.50 / -1.41%
             |             
            
                35.00
             |           
            
                36.00
             |               
            
                34.50
             |                           
            
                35.00
             | 
            
                35.00
             |                     
            
                2.85
             |                                 
            
                4,400
             |            
            
                 
             |                                       
         
    
        
            | 
                8/31/2007
             | 
            
                +0.70 / +2.01%
             |             
            
                35.50
             |           
            
                37.50
             |               
            
                35.50
             |                           
            
                35.50
             | 
            
                35.50
             |                     
            
                2.89
             |                                 
            
                1,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/30/2007
             | 
            
                +0.80 / +2.35%
             |             
            
                35.00
             |           
            
                36.00
             |               
            
                34.80
             |                           
            
                34.80
             | 
            
                34.80
             |                     
            
                2.83
             |                                 
            
                3,900
             |            
            
                 
             |                                       
         
    
        
            | 
                8/29/2007
             | 
            
                +0.40 / +1.19%
             |             
            
                35.00
             |           
            
                35.00
             |               
            
                34.00
             |                           
            
                34.00
             | 
            
                34.00
             |                     
            
                2.76
             |                                 
            
                800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/28/2007
             | 
            
                +0.60 / +1.82%
             |             
            
                34.20
             |           
            
                34.20
             |               
            
                33.60
             |                           
            
                33.60
             | 
            
                33.60
             |                     
            
                2.73
             |                                 
            
                3,400
             |            
            
                 
             |                                       
         
    
        
            | 
                8/27/2007
             | 
            
                -1.00 / -2.94%
             |             
            
                33.50
             |           
            
                33.50
             |               
            
                33.00
             |                           
            
                33.00
             | 
            
                33.00
             |                     
            
                2.68
             |                                 
            
                2,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/24/2007
             | 
            
                +0.10 / +0.29%
             |             
            
                34.00
             |           
            
                34.00
             |               
            
                34.00
             |                           
            
                34.00
             | 
            
                34.00
             |                     
            
                2.76
             |                                 
            
                2,100
             |            
            
                 
             |                                       
         
    
        
            | 
                8/23/2007
             | 
            
                -0.60 / -1.74%
             |             
            
                34.00
             |           
            
                34.00
             |               
            
                33.50
             |                           
            
                33.90
             | 
            
                33.90
             |                     
            
                2.76
             |                                 
            
                1,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/22/2007
             | 
            
                0.00 / 0.00%
             |             
            
                35.00
             |           
            
                35.00
             |               
            
                34.50
             |                           
            
                34.50
             | 
            
                34.50
             |                     
            
                2.81
             |                                 
            
                1,700
             |            
            
                 
             |                                       
         
    
        
            | 
                8/21/2007
             | 
            
                0.00 / 0.00%
             |             
            
                35.00
             |           
            
                35.00
             |               
            
                34.50
             |                           
            
                34.50
             | 
            
                34.50
             |                     
            
                2.81
             |                                 
            
                1,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/20/2007
             | 
            
                0.00 / 0.00%
             |             
            
                34.90
             |           
            
                35.00
             |               
            
                34.50
             |                           
            
                34.50
             | 
            
                34.50
             |                     
            
                2.81
             |                                 
            
                2,900
             |            
            
                 
             |                                       
         
    
        
            | 
                8/17/2007
             | 
            
                0.00 / 0.00%
             |             
            
                35.00
             |           
            
                35.00
             |               
            
                34.50
             |                           
            
                34.50
             | 
            
                34.50
             |                     
            
                2.81
             |                                 
            
                300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/16/2007
             | 
            
                -0.20 / -0.58%
             |             
            
                34.00
             |           
            
                34.70
             |               
            
                34.00
             |                           
            
                34.50
             | 
            
                34.50
             |                     
            
                2.81
             |                                 
            
                7,600
             |            
            
                 
             |                                       
         
    
        
            | 
                8/15/2007
             | 
            
                -1.10 / -3.07%
             |             
            
                36.00
             |           
            
                36.00
             |               
            
                34.70
             |                           
            
                34.70
             | 
            
                34.70
             |                     
            
                2.82
             |                                 
            
                900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/14/2007
             | 
            
                +0.20 / +0.56%
             |             
            
                36.00
             |           
            
                36.00
             |               
            
                35.80
             |                           
            
                35.80
             | 
            
                35.80
             |                     
            
                2.91
             |                                 
            
                1,100
             |            
            
                 
             |                                       
         
    
        
            | 
                8/13/2007
             | 
            
                -0.40 / -1.11%
             |             
            
                36.00
             |           
            
                36.00
             |               
            
                35.50
             |                           
            
                35.60
             | 
            
                35.60
             |                     
            
                2.89
             |                                 
            
                6,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/10/2007
             | 
            
                -1.50 / -4.00%
             |             
            
                36.20
             |           
            
                36.30
             |               
            
                35.50
             |                           
            
                36.00
             | 
            
                36.00
             |                     
            
                2.93
             |                                 
            
                2,700
             |            
            
                 
             |                                       
         
    
        
            | 
                8/9/2007
             | 
            
                +2.40 / +6.84%
             |             
            
                35.10
             |           
            
                37.50
             |               
            
                34.80
             |                           
            
                37.50
             | 
            
                37.50
             |                     
            
                3.05
             |                                 
            
                500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/8/2007
             | 
            
                -2.30 / -6.15%
             |             
            
                35.00
             |           
            
                35.10
             |               
            
                35.00
             |                           
            
                35.10
             | 
            
                35.10
             |                     
            
                2.85
             |                                 
            
                3,400
             |            
            
                 
             |                                       
         
    
        
            | 
                8/7/2007
             | 
            
                +0.50 / +1.36%
             |             
            
                37.50
             |           
            
                37.50
             |               
            
                36.90
             |                           
            
                37.40
             | 
            
                37.40
             |                     
            
                3.04
             |                                 
            
                1,700
             |  
            
                 
             |                                                              
             
    
         
    
    
 |