From the Utah Geology website, location #28, it says "Directions To Site: From the intersection of Utah Hwy 10 and I-70 south of Emery, take the graded dirt road (on the south side of the interchange) east abot 1.5 miles and then go south about 9 miles.  Driving up from the valley floor, you will see a pond on the right side which may be dry during the summer. Agate chips are found in this vicinity. Larger pieces can be found in the washes nearby."

I tried to put the GPS marker in the same position as it is on the map at the Utah website.