Scrollable aerial view at bing.com. (Click to open in a new window).
Primary impact is NOISE produced by frequent climbs for a skydiving operation. The climbs have been concentrated away from the airport, due to conflicts with commercial arrivals to various Portland area airports, and likely also to keep peace with neighbors living near the actual airport, which is roughly a half mile west of the Molalla Safeway.
Flights routinely depart to the north, crossing very low over Highway 211, then make a right turn just south of Mulino Airport and circle-to-climb east of Union Mills. The circling intrudes upon the peace below for thousands of rural Oregonians, sometimes for more than ten minutes per flight. The noise problem is magnified by use of a loud aircraft, a turbo-powered Cessna 208 (normally used to feed freight from remote airports to hub airports). If the operator cared to be a good neighbor, he would climb safely at a slower rate and generate a lot less noise, using a different aircraft or changing the prop, prop pitch, or RPMs. If he kept his climbs within 2-miles of the Molalla Airport, both the overall noise impact and the chances of a midair collision would be greatly reduced.