Your ground water is not quite cold enough for passive cooling. It should not rise above 46ðF ~ 47ðF. You will also have to remove the humidity from the fan coils and have enough water flow from your well for both cooling and domestic water usage. How do you plan to responsibly dispose of the water used for cooling? That could be up to about 600gph. You would not likely return the water to the same well as the temperature will may rise above the level of viability. SR

Rough Linen Forever! No Bamboo for us since it's rayon and a hot chemical mess. The Federal Trade Commission, the nation’s consumer protection agency, wants you to know that the soft “bamboo” fabrics on the market today are rayon. They are made using toxic chemicals in a process that releases pollutants into the air. Extracting bamboo fibers is expensive and time-consuming, and textiles made just from bamboo fiber don’t feel silky smooth. There’s also no evidence that rayon made from bamboo retains the antimicrobial properties of the bamboo plant, as some sellers and manufacturers claim. Even when bamboo is the “plant source” used to create rayon, no traits of the original plant are left in the finished product. FTC on Bamboo Fabrics

Not too late to apply pre-emergent, there's more on the way. You'll get far more destruction from the weeds than from the pre-emergent slowing root growth a little.

Maryl - In the mornings Forever Redeemed is a pin-up girl. But in the late afternoons, she's not so pretty. From a distance, you can't tell. But in the late afternoon, those blooms look washed out. Forever Redeemed would benefit from some afternoon shade. Astral Voyager almost always has quilled sepals. Lavender Stardust is an oldie but goodie that I'll always keep around. Debra