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1 <br /> 7.0 CONCLUSIONS AND RECOMMENDATIONS <br /> 7.1 Conclusions <br /> ' The conclusions presented by Park are based on field observations, interpretations of analytical <br /> test results and previous investigative reports performed by previous consulting firms The <br /> conclusions of Park are as follows <br /> r • All four corners at the site intersection of Farmington and <br /> Manposa have had operating retail gasoline service stations on <br /> them at one time or another No site assessments have been <br /> performed at any of these other corners, <br /> ' • Soil sample analyses indicate that petroleum hydrocarbon impacted <br /> soils were primarily h rated to the 30 foot depth in MW-3-P, <br /> ' • Soil sample analyses indicate that petroleum hydrocarbons have not <br /> nugrated south and east of the site, <br /> ' • Groundwater was encountered in all the monitoring wells installed <br /> by Park between 75 11 feet and 76 79 feet bgs, <br /> • Groundwater is calculated to be flowing below the site in a <br /> northeasterly direction, <br /> • Chemical analyses of groundwater samples collected from the three <br /> installed wells indicate that groundwater is only slightly impacted <br /> ' with petroleum hydrocarbon in MW-2-P and MW-3-P, <br /> • The extent of impacted groundwater off-site has not been assessed <br /> ' in either the up gradient or down gradient directions, <br /> • The gas chromatography (analytical chromatogram) and the BTEX <br /> analytical results in sod and groundwater indicate the petroleum <br /> hydrocarbons detected are significantly aged, <br /> ' • TPH vapors 1n the sort measured dunng the vapor extraction <br /> treatability test are highest on the eastern side of the site between <br /> 40 and 70 feet bgs <br /> B 112571 RPT 16 <br />