Spray every 15 to 18 values:

  DATE DSV DATE DSV DATE DSV DATE DSV
6/10 0 6/23 40 7/06 88 7/19 140
6/11 3 6/24 42 7/07 92 7/20 144
6/12 6 6/25 45 7/08 96 7/21 148
6/13 8 6/26 48 7/09 100    
6/14 8 6/27 52 7/10 104    
6/15 9 6/28 56 7/11 108    
6/16 12 6/29 60 7/12 112    
6/17 16 6/30 64 7/13 116    
6/18 20 7/01 68 7/14 120    
6/19 24 7/02 72 7/15 124    
6/20 28 7/03 76 7/16 128    
6/21 32 7/04 80 7/17 132    
6/22 36 7/05 84 7/18 136