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Interim Investigation Report June 21, 1996 <br /> Chapin Brothers Automotive Stockton, California <br /> TABLE 2 <br /> RESULTS OF SAMPLE ANALYSES <br /> GROUNDWATER SAMPLES <br /> CHAPIN BROTHERS SITE <br /> STOCKTON, CALIFORNIA <br /> 1 Well Number Ethyl- Total <br /> and Date TPHg Benzene Toluene benzene Xylenes <br /> MW1 <br /> 1 12/7/90 200 31 111 19 5.2 <br /> 3120/96 23 6 9 0.94 0 19 0.82 <br /> MW2 <br /> 1/13/94 <0 05 <0 0005 <0 0005 <0 0005 <0 0009 <br /> 6/14194 <0 05 <0 0005 <0 0005 <0 0005 <0 0009 <br /> 1112195 <0 05 <0 0005 <0 0005 <0 0005 <0 0005 <br /> 3120196 <0 05 <0 0003 <0 0003 <0 0003 00009 <br /> ' MW3 <br /> 1113/94 1.7 0 021 0.015 0.037 0.045 <br /> 6/14/94 1.5 0.028 0.0037 0.0070 0.018 <br /> 1/12/95 2 2 024 00088 00060 0.015 <br /> 3/20/96 17 0 033 00012 00051 0 026 <br /> MW4 <br /> 1113194 170 45 40 <0 30 12 <br /> 6/14/94 100 23 25 2.9 15 <br /> 3120/96 70 23 19 0.75 3.8 <br /> MW5 <br /> 3120/96 2.9 0.0005 00017 0.022 0.018 <br /> ND= Not detected, laboratory limit of detection not given <br /> TPHg = Total petroleum hydrocarbons as gasoline <br /> Results given in milligrams per liter (parts per million) <br /> < = Less than laboratory minimum detection limits <br /> MW 1 = Monitoring well number <br /> 4.0 CONCLUSIONS AND RECOMMENDATIONS <br /> ' Construction of vapor extraction. wells VE-5 and VE-6 completes the vapor well <br /> p p p <br /> 1 installation portion of the Remedial Action Plan approved by San Joaquin County Environmental <br /> Health Department Currently, the treatment system is being built and the wells constructed for <br /> vapor extraction/air sparging are being plumbed together to allow connection to the treatment <br /> ' system Construction of the additional monitoring well MW5 was not sufficient to define the <br /> boundary of the contamination plume Consequently, additional groundwater monitoring will be <br /> required to the south of MW5, to the north of well MW3, and to the west of well MW3 and MW5 <br /> Each of these wells would be located offsite, and would require encroachment permits fro <br /> adjacent owners and/or the City of Stockton At a minimum, groundwater sampling of the <br /> ' existingwells, and an additional wells, should continue on a quarterly basis <br /> Y <br /> 530-001 - 6 - LUSH GEOSCIENCES <br />