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<br /> • A S S O C I A T E S I N C
<br /> respectively Benzene and toluene were detected in the samples collected from wells MW-2P and
<br /> MW-1, respectively, at concentrations of 2 3 µg11 and 0 6 µg/l, respectively MTBE was detected in
<br /> the samples collected from MW-2P, MW-3P, and MW-1 at concentrations of 180 µgll, 2 3 gg/l, and
<br /> 160 µg/l, respectively DIPE was detected in the samples collected from MW-IP, MW-2P, MW-3P,
<br /> MW-4P, MW-5P, MW-6P, and MW-1 at concentrations of 140 µg11, 71 µg/l, 130 µg11, 28 µg11, 39
<br /> µg11, 150 µg11, and 0 8 µg/l, respectively TBA was detected in the samples collected from MW-2P
<br /> and MW-1 at concentrations of 53 µg/1 and 60 µg11, respectively 1,2-DCA was detected in samples
<br /> collected from MW-1P, MW-2P, MW-3P, MW-4P, MW-5P, MW-6P, and MW-I at concentrations
<br /> of 12 gg/l, 13 µg11, 16 µg/l, 2 1 µg/l, 10 gg/l, 24 µg11, and 6 4 µg/l, respectively A summary of
<br /> analytical results is presented in Table 2 Laboratory data sheets and chain-of-custody documentation
<br /> are contained in Attachment 2
<br /> GEOTRACKER DATA UPLOAD
<br /> The depth to water and laboratory data were submitted electronically to the State Water Resources
<br /> Control Board (SWRCB) Geotracker database (confirmation numbers 3018940567 and 5482436895,
<br /> respectively) The facility has been assigned a Geotracker global identification number
<br /> T0607700064 Documentation of the data submittal is contained in Attachment 3
<br /> CONCLUSIONS AND RECOMMENDATIONS
<br /> . The groundwater flow direction on February 8, 2005, was variable, but generally flowed toward the
<br /> south, southeast Based on the results of the first quarter 2005 monitoring episode, we recommend
<br /> continued quarterly monitoring and additional off-site investigation to define the lateral extent of
<br /> impacted groundwater to the northwest and southeast
<br /> Please contact our office at(209) 579-2221 if you have any questions or comments
<br /> Respectfully submitted,
<br /> ATC Associates Inc
<br /> Todd Hafner � � `,€ "
<br /> Project Geologist `� � f� c
<br /> i
<br /> Je nne Hornsey, P E
<br /> CA Registered Civil Engineer No 47410
<br /> icc Chuck Miller, USA Petroleum Corp
<br /> Jim Barton, RWQCB
<br /> s lenvironmenta112591210003-Stockton\QuartlyliQR-2005 doe 3
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