On January 10, 2005 2 boreholes were advanced to 15 feet bgs and developed as temporary monitoring wells. One boring, B-1, was installed near the existing USTs and pump islands. The other boring, B-2, was advanced near the former AST location. Soil was PID field screened at 1-foot intervals and the sample with highest PID submitted for analysis. Groundwater was encountered at 9 feet bgs. A groundwater sample was collected from each well and analyzed by Iowa Method OA-1 and OA-2. TEH as diesel and motor oil were detected in soil at concentrations below statewide standards. TEH as diesel was detected in both Groundwater samples at concentrations that exceed the statewide standard. The property is currently an active convenience store and gas station.there was a tank farm, AST bulk fuel storage, associated with the property. This bulk plant had been active for 70 years and was dismantled in November of 2004. The property was an LUST site in 1999 and the Tier 2 identifies a drinking water well and a non-drinking water well located within 1,000 feet. There is also a plastic water line within 200 feet. Some contaminant concentration data used in the Tier 2 dates back to 11/18/1991. SS: Soil B-1 (sample from 11 feet bgs) TEH as diesel and TEH as motor oil were detected at concentrations below statewide standards. TEH as gasoline was detected with no applicable statewide standard. B-2 (sample from 9 feet bgs) TEH as diesel and TEH as motor oil were detected at concentrations below statewide standards. TEH as gasoline was detected with no applicable statewide standard. BTEX compounds were below detection limits in both samples. Groundwater: B-1: TEH as diesel was detected at 5,540 ug/L, above the statewide standard of 1,200 ug/L. TEH as motor oil was detected at 386 ug/L, below the statewide standard of 400 ug/L. TEH as gasoline was detected at 7,930 ug/L with no applicable statewide standard. Benzene was detected at 6.4 ug/L, above the statewide standard of 5 ug/L. Other BTEX compounds were detected below statewide standards. B-2: TEH as diesel was detected at 1,380,000 ug/L, above the statewide standard of 1,200 ug/L. TEH as motor oil was detected at 6,340 ug/L, above the statewide standard of 400 ug/L. TEH as gasoline was detected at 558,000 ug/L with no applicable statewide standard. Benzene was detected at 54.7 ug/L, above the statewide standard of 5 ug/L. Other BTEX compounds were detected below statewide standards. ontaminants in groundwater is present at the site in concentrations that far exceed statewide standards, TEH diesel in one groundwater sample is 3 orders of magnitude above the statewide standard. Only 2 borings were advanced in an area that covers approximately 1 acre. No Phase 1 was performed and possible receptors have not been identified. Apparent contamination is the result of a petroleum release. Further assessment will be required under Chapter 133 or 135. A work plan will be requested.