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diesel range, although the chromatogram did not show a diesel pattern <br /> Relatively low concentrations of hydrocarbons were detected in the soil <br /> sample analyzed from boring MW-5 This boring is located between the <br /> pump islands and the USTs and near the northern property line None of <br /> the hydrocarbon concentrations detected exceeded USEPA PRGs f or <br /> residential soil <br /> 9 . 0 MONITORING WELL INSTALLATION, DEVELOPMENT AND <br /> SAMPLING <br /> 9. 1 Monitoring Well.,, installation <br /> Groundwater monitoring wells MW-1 through MW-10 were installed in <br /> borings MW-1 through MW-10, respectively Monitoring wells MW-1 <br /> through MW-6 were constructed with 2-inch diameter, 0 020-inch slotted, <br /> flush-threaded, Schedule 40 PVC well screen and blank casing Each well <br /> is screened between 9-feet bgs and the total depth of the well of 19-feet <br /> bgs Lonestar #2112 Monterey sand occupies the annular space between <br /> the borehole and the casing from the bottom of the boring to <br /> approximately 1-foot above the well screen A 1-foot thick hydrated <br /> bentonite layer separates the sand from the overlying cement surface seal <br /> The cement surface seal in these shallow wells was placed by gravity free- <br /> fall <br /> Monitoring wells MW-7 through MW-10 were constructed using 2-inch <br /> diameter, 0 020-inch slotted, flush-threaded, Schedule 80 PVC well screen <br /> and blank casing Monitoring wells MW-7 and MW-9 are screened <br /> between 55-feet bgs and the total depth of these wells of 70-feet bgs <br /> Monitoring well MW-8 is screened between 100-feet bgs and the total <br /> depth of the well of 115-feet bgs Monitoring well MW-10 is screened <br /> between 105-feet bgs and the total depth of the well of 115-feet bgs <br /> Lonestar #2112 Monterey sand occupies the annular space between the <br /> borehole and the casing in each of these wells from the bottom of the <br /> boring to approximately 1-foot above the well screen A 2-foot thick <br /> hydrated bentonite layer separates the sand from the overlying cement <br /> surface seal The cement sanitary surface seal in each of these wells was <br /> placed by tremae pipe <br /> The wellheads on all ten wells are secured with locking wellplugs beneath <br /> at-grade traffic-rated vaults <br /> Franks One Stop Report - June 1999 <br /> -8- <br />