Terracon Consultants, Inc. (Terracon) conducted a Focused Soil Delineation (FSD) at the Heritage Crossing, Tract 9 site located at 439 and 501 W. 2nd St./416 W. Irving Blvd./127 and 129 O�Connor Rd. in Irving, Texas (site). Terracon�s FSD was undertaken in response to the results of Terracon�s Limited Site Investigation (LSI), dated December 8, 2014 (LSI � Report No. 94137376D), which indicated the on-site soils in the vicinity of soil boring SB-7 appeared to be affected by a release of petroleum, more specifically, Total Petroleum Hydrocarbons (TPH). Additionally, various petroleum-related Volatile Organic Compounds (VOCs), various Polycyclic Aromatic Hydrocarbons (PAHs), and a low concentration of trichloroethene (TCE) were detected in soil boring SB-7. The detected TPH concentrations were above the calculated TPH Mixture Residential Protective Concentration Level (PCL). The detected petroleum-related VOCs, PAHs and TCE concentrations were below the applicable Texas Risk Reduction Program (TRRP) Action Levels. Due to the elevated soil TPH concentrations in the vicinity of SB-7, further delineation was required in the area to evaluate the extent and magnitude of a response action. The ive of the FSD was to collect additional soil data to further delineate the soils in the vicinity of SB-7 to assist the City of Irving with evaluating an appropriate response action. Terracon�s FSD was conducted in accordance with the Property-Specific Sampling and Analysis Plan (PSAP), dated January 15, 2015, and approved by Mr. Paul Johnson of EPA Region 6 on April 8, 2015. The findings and recommendations of this investigation are as follows: � Based on the analytical results, the on-site soils in the vicinity of soil boring SB-12, SB-13, SB-16, and SB-17 appear to be affected by a release of petroleum, more specifically, TPH. The detected total TPH concentrations in SB-12 and SB-16 were above the previously calculated TPH Mixture Residential PCL of 14,100 mg/kg. The ive of the FSD was to delineate the extent of the TPH which requires a response action necessary to achieve regulatory closure. Based on the TPH results, the highest total TPH concentration was detected in the original sample (SB-7). The TPH impacted soils appears to extend in an eastward direction (SB-12 and SB-16) at decreasing concentrations with increasing distance from SB-7. TPH impacted soils are present in the soil column from near the surface to the top of the water table at approximately 17 feet bgs. Although TPH impacted soils likely extends east beyond SB-16, the TPH impacted soils are not anticipated to extend far beyond SB-16 as evidenced by decreased concentrations with increasing distance. � Based on the total TPH concentrations the estimated horizontal extent of TPH impacted soil requiring a response action measures approximately 7 feet by 20 feet (7� x 20�) and extends vertically to a depth of approximately 17 feet bgs (top of the water table). The estimated volume of soil requiring a response action is approximately 90 in-place cubic yards (yds3). Terracon recommends that the TPH impacted soils be excavated and transported off-site for property disposal (i.e., dig and haul). � Various petroleum-related VOCs and low concentrations of PCE and TCE were detected in soil borings SB-12, SB-13, SB-16, and SB-17. PCE was detected above the TRRP Action Level in SB-12, SB-13, and SB-16. The City of Irving submitted a TCEQ Voluntary Cleanup Program (VCP) application on October 28, 2015, and was accepted into the VCP December 11, 2015. A VCP Self Implementation Notice (SIN) was submitted to the VCP on April 26, 2016 and was approved on May 11, 2016. On May 9, 2016 Terracon oversaw the excavation of the TPH-impacted soils. During the excavation activities, a subgrade concrete vault was identified in the area of impacted soils, which appeared to be the source of the TPH soil impacts. The excavated soils and concrete vault was stockpiled on-site pending lab