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MOM <br /> San Joaquin River <br /> I---------- s------- ___ <br /> �rPump House I MW-12d SI C1 /�----� <br /> C6 (from ditch to river) I I , o-3 • 61 � �A1 <br /> IS B-1311 MW-6d\ -12r 1 MW-14d MW-1$ I 1 <br /> D1 I B-14 MW-6r L-----------X 1ST ISBKG <br /> 5 6 MW-6s MW-12s g-11 I Nom`' 1 I MW-5d 1 <br /> ❑B-12 8-10 dI ❑ ® #�—BMW-Sp <br /> -9p MW-9s I C2 MW-13d D4 L B-1 g_,5 14 MW-5s <br /> 5C 2 MW-13p -2 M; g62-iS .. <br /> MW-13s iI Mw- <br /> 5 <br /> W 5 MW-3 �vI <br /> E-2 BKG4 0 <br /> 56 � MW-8s MW-7s W-7p <br /> B5 MW-8p <br /> 4 <br /> W-10s CBKG3o ~din <br /> MW-1 C3 D1 <br /> o A133DE-3 BKG2 <br /> 5A C4 M^ <br /> B <br /> 2 � <br /> MW-11 s � 3C <br /> i <br /> MW-11p Legend: <br /> A ® Sediment pH Monitoring Location <br /> ❑ Soil Boring(2002) <br /> Monitor wells("d"-screened in dredge sediments, <br /> "p"=screened in peat layer, <br /> 0 150m 300m <br /> s -screened in sand layer) � <br /> A Island drainage ditch monitoring locations % <br /> ,.` SCALE: 1cm = 150m <br /> !,j, <br /> o Grab ground water samples(2004) <br /> • Grab ground water samples collected in April 2005 Significant Hydrologic Features and Soil Figure <br /> Approximate Outline of Dredge Material and Ground Water Sample Locations <br /> Island Drainage Ditch(drain shallow groundwater L.F <br /> and and deliver irrigation water) Roberts No.1 Dredge Sediment Placement Site <br /> Note: Agricultural field ditches indicated in aerial photo. Roberts Island, Stockton, California , <br /> Environmental Risk Services Corporation <br />