Weld County has an infant mortality rate of 7.2 per 1000, or 0.72%. Doesn't quite add up to your statement does it? Although I suppose that doesn't address your miscarriage comment... a quick Google search reveals that...

"Among women who know they are pregnant, the miscarriage rate is roughly 10% to 20% while rates among all fertilisation is around 30% to 50%."

So you're essentially saying that the miscarriage rate is the exact same near O&G ops in Pennsylvania as it is across the rest of the country.