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r <br /> TABLE OF CONTENTS <br /> 1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 <br /> 2.0 BACKGROUND 4 <br /> 2.1 SITE LOCATION AND HISTO • • • • • • .. . . . . • • • • G <br /> 2.2 SUMMARY OF PREVIOUS WORK. . . . . . . . . . . . . • • • . . . • . . . . . <br /> 6 <br /> 2.2.1 TANK REMOVAL. . .. . • • . . . • . • . • • . . • . . • . • . 6 <br /> 2.2.2 WORK PERFORMED BY SCS ENGINEERS. . . . . . . . . . . . . . $ <br /> 2.2.3 PREVIOUS WORK PERFORMED BY GTI. . . . . . . . . <br /> 9 <br /> 2.3 ADDITIONAL WORK. . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . 10 <br /> 3.0 WORK PERFORMED. . • . . . . . • . . . . . . • . . . . . . . . . . . . <br /> 3.1 SPP REMOVAL AND GROUNDWATERELEVATION•MEASUREMEN`T'S: . 10 <br /> 10 <br /> 3.2 SOIL—VAPOR SURVEY. . . . . . <br /> 11 <br /> 3.3 MONITORING WELL INSTALLATION• • . • • • • • ' „ 11 <br /> 3.3.1 DRILLING METHODS. . . . . . . . . . . . . . . . . . . . . . . <br /> 3.3.2 <br /> 12 <br /> 3.3.2 SOIL SAMPLING. . . . . . . . . . . . . .. . . . . . . . . . . <br /> . . . . . . 12 <br /> 3.3.3 WELL CONSTRUCTION. . . . . . . . . . . . . . . . . . . . . . <br /> 14 <br /> 3.3.4 GROUNDWATER LEVEL MEASUREMENTS AND SAMPLING. . 16 <br /> 3.4 AQUIFER TESTS. . . . . . . . . . . . . . . . . . . . . . <br /> . . . . . . . . . . . . 19 s <br /> 4.0 RESULTS AND DISCUSSION. . . . . . . . . . . . . . . . . . . . . . . 19 <br /> 4.1 SOIL—VAPOR SURVEY. . . . . . . . . . . . . . . . . • • • • . . . . ' . . . . . 22 <br /> 4.2 SOIL CONDITIONS. . . . . . . . . . . . . . . . . . 26 <br /> 4.3 GROUNDWATER CONDITIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 <br /> 4.4 HYDROGEOLOGY. . . . . . . . . 32 <br /> 4.5 DISCUSSION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 <br /> 5.0 REMEDIAL ALTERNATIVES. . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . . . 35 <br /> 5.1 NO ACTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 <br /> . . . . . . . . . . . . . . . . 38 <br /> 5.3 SOIL EXCAVATION. . . . . . . . . . . . . . . • . . . . . . . . • . . • 39 <br /> 5.3.1 DISPOSAL OF EXCAVATED SOIL. . . . . . . . . . . . . <br /> 5.3.2 ON— <br /> SITE TREATMENT OF EXCAVATED SOIL. . . . . . . . . . 40 <br /> . . . . . . . . . . . 41 <br /> 5.4 VAPOR EXTRACTION. . . . . . . . . . . . . . . . . . . . . . . . . <br /> " GROUNDWATER <br /> TCCIINOLOGY.INC. <br />