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May 24, 1996 '�, Quarterly Monitoring Report <br /> Chapin Brothers Automobile Repair Facility Stockton, California <br /> were also completed as part of SEACOR's investigation. Based on the results of these tests, <br /> SEACOR recommended vapor extraction be used to mitigate site contamination. <br /> Geologic Audit Services (GAS) drilled five additional soil borings and constructed one <br /> dually completed 4-in vapor extraction.,well/2-in air sparging observation well, one 2-in air <br /> sparging observation well, one dually-completed 2-in air sparging/2-in vapor extraction well, <br /> one 4-in vapor extraction well, and one air sparging well. GAS subsequently performed an air <br /> sparging/vapor extraction feasibility test. GAS presented a radius of influence of 37 ft based on <br /> i <br /> the results of the test. <br /> In February 1996, Lush Geosciences was retained to implement remediation of site <br /> contamination utilizing vapor extractioii/ air sparging, construct an additional groundwater <br /> monitor well on property southwest of the site, and resume quarterly monitoring of all of the <br /> groundwater monitor wells. Two additional vapor extraction/observation wells have been <br /> constructed onsite and one additional monitoring well was constructed offsite to the west of the <br /> site. Results of construction of these wells will be presented under separate cover in an interim <br /> report. Design and permitting of the vapor extraction system is in progress. <br /> 'F <br /> i <br /> i <br /> 530-001 - 2 - <br /> LUSH GEOSCIENCES <br /> I� <br />