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GRANITE CONSTRUCTION FACILITY <br /> March 17, 1997 <br /> Page 5 <br /> April 10, 1996 - Groundwater samples were collected from monitoring wells MW 1- <br /> MW4. In addition, one composite stockpile soil sample was <br /> collected from the diesel contaminated soil generated from beneath <br /> the former dispenser island. Groundwater measurements indicate <br /> that groundwater flow direction is to the north with a hydraulic <br /> gradient of 0.001 feet/foot. Analysis of groundwater samples <br /> collected from MW 1 - MW3 revealed TPH as gasoline ranging <br /> from 170 µg/1 to 320 µg/1. Analysis of the composite stockpile <br /> sample revealed TPH as diesel at 420 mg/kg. <br /> July 22, 1996 - Groundwater samples were collected from monitoring wells NMI,' <br /> MW2, MW3, and MW8. Groundwater measurements indicate that <br /> groundwater flow direction is to the northwest with a hydraulic <br /> gradient of 0.003 feet/foot. Analysis of groundwater samples <br /> collected from MW 1 and MW3 revealed TPH as gasoline at 170 <br /> µg/1 to 320 µg/1, respectively. No detectable concentrations of TPH <br /> as gasoline were detected in MW2 and MW8. <br /> 1997 <br /> January 16, 1997 - A Request for Site Closure report was prepared for the site that <br /> included a Risk-Based Corrective Action (RBCA) evaluation of <br /> subsurface soil contamination to assess potential human exposure <br /> pathways due to soil volatilization into outdoor/indoor air. <br /> January 23, 1997 - Groundwater samples were collected from monitoring wells MW1 - <br /> MW4. Groundwater measurements indicate that groundwater flow <br /> direction has changed from a northwest direction to a southwest <br /> direction since our previous monitoring event. Analysis of <br /> groundwater samples revealed an increase in TPH-g and benzene in <br />