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U.S. Environmental Protection Agency, Region IX - page 8 / 97

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IMGP0019 – From top of north bank of coffer dam, looking south toward downstream direction of Oak Creek.

IMGP0020 – From west side of creek, northernmost pier of vehicular bridge, facing east. Creek flows from left to right of picture frame. Sediment is probably from upstream sources.

IMGP0021 – From west side of creek, northernmost pier of vehicular bridge, facing southeast. Creek flows from left to right of picture frame. Sediment is probably from the project.

IMGP0022 – Closeup of fine sediments from IMGP0021.

IMGP0023 – From top of coffer dam, facing south/downstream direction of Oak Creek (shown on left side of picture frame). Note fine sediments on creek side of coffer dam.

IMGP0024 – Closeup of fine sediments from IMGP0023.

IMGP0025 – From west side of creek, facing south/downstream direction of Oak Creek.

IMGP0026 – From west side of creek (southeast edge of coffer dam), facing southeast/downstream direction of Oak Creek. Note fine sediments in foreground.

IMGP0027 – From west side of creek (southeast edge of coffer dam), facing north toward bridges. Note fine sediment.

IMGP0028, 29 – From west side of creek (southwest edge of coffer dam) at end of grading work, facing southeast toward creek. Note fine sediments in foreground. Creek flows from left to right side of picture frame.

IMGP0030 – From west side of creek at southern edge of coffer dam, facing southeast. Note fine sediment deposit in foreground.

IMGP0031 – Same as IMGP0030, showing depth of fine sediment deposit.

IMGP0032 – From west side of creek at southern edge of grading, facing southeast toward downstream flow of creek.

IMGP0033 – From west side of creek. MP2 (monitoring point 2): sampling point downstream of bridges.

IMGP0034 – MP2 (monitoring point 2), same as IMPG0033, taken a few steps north. Note coir logs/straw wattles on east bank across creek.

IMGP0035 – From west side of creek, facing northeast toward vehicular bridge. Note fine sediment deposit in foreground.

IMGP0036 – From parking lot atop Tlaquepaque (west) slope, facing east toward Garland. Creek flows from left to right side of picture frame.

IMGP0037 – Spill kit supplies stored on west side of pedestrian bridge. 2

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