Advancement of soil borings to a depth of 60-90 ft. below grade surface (bgs) that of which were later converted into groundwater monitoring wells and soil vapor extraction wells at a gas station in Riverside County, CA. The site is impacted with gasoline-associated constituents (i.e., MTBE) based due to former gasoline equipment. Purpose of this project was to further delineate the extent of petroleum-based contamination at the subject site.