|
i
<br /> concentrations of 22 pg/l and 1 4 pg/l, respectively Toluene and xylenes were detected in the sample
<br /> collected from MW-1 at conecentrations of 12 Vg/1 and 2 0 pg/l, respectively MTBE was detected
<br /> in the samples collected from MW-2P, MW-3P, and MW-1 at concentrations of 270 µg11, 2 4 jig/I,
<br /> and 190 µg11, respectively DIPE was detected in the samples collected from MW-1P, MW-2P, MW-
<br /> 3P, MW-4P, MW-5P, MW-6P, and MW-1 at concentrations of 120 gg/l, 43 pg/l, 93 gg/l, 24 pg/l, 30
<br /> µg11, 150 µg11, and 0 7 µg11, respectively TBA was detected in the samples collected from MW-1P,
<br /> MW-2P, MW-3P, and MW-1 at concentrations of 14 µg11, 210 µg/l, 19 µg11, and 63 µg11,
<br /> respectively 1,2-DCA was detected in samples collected from MW-1P, MW-2P, MW-3P, MW-4P,
<br /> MW-5P, MW-6P, and MW-1 at concentrations of 11 µg/l, 2 7 µg/1, 8 7 pg/l, 1 8 µg11, 7 1 µg/l, 22
<br /> µg11, and 4 3 gg/l, respectively A summary of analytical results is presented in Table 2 Laboratory
<br /> data sheets and chain-of-custody documentation 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) Geotracher database (confirmation numbers 3173278629 and 2985817968,
<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 May 11, 2005, generally flowed toward the south Based on the
<br /> results of the second quarter 2005 monitoring episode, we recommend continued quarterly
<br /> monitoring and additional off-site investigation to define the lateral extent of impacted groundwater
<br /> 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 /> rq L,y'TyT' �,Fta Pi�� a rN 11�
<br /> Mark Jamison Ili l-t
<br /> Staff Geologist ^
<br /> R~
<br /> Jeanne Homsey, P Ei
<br /> CA Professional Civil Engineer#47410
<br /> • cc Chuck Miller, USA Petroleum Corp
<br /> Jim Barton, RWQCB
<br /> s Ienvironmental12591210003-Stockton\Quartlyl2QR-2005 doc 3
<br />
|