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FRP - Temp Reinf.

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I'm designing a lid for a water catchment tank and I'm planning on using GFRP for my reinforcement. It's also being planned to be used as an exterior basketball court. Per ACI 440.1R-01 I need to calculate the temp/shrinkage reinf. using eqn. (10-1). Ok, so I check it and it's requiring a reinforcement ratio of 0.0066. This requires #7 @ 12" o/c.

1.  Does this sound right for a 10" slab?  Seems excessive.

2. Is there a maximum ratio? I saw in someone's calcs on the web showed a max of 0.0036 but that was for a slab on grade design. Not sure where that 0.0036 comes from. Didn't see a reference in ACI 318, either.

Thank's in advance!

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