A year or so ago, I poured a concrete slab for a storage building and accidently sloshed some wet cement in the san augustine grass. I tried to flush the area with a lot of water but surely changed the soil composition. The grass starts out OK but starts dying as the heat increases in june - july. I have added organic material and also had my soil tested recently. The soil tested acid and I was told to place DOLOMITIC LIMESTONE on the yard. What quanity of limestone do I need and is this a correct fixx ?