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XzX LEGEND P� o Shallow Zone Monitor Well P� BGG CWS-35 Al AVE --o Did Not Pump On' Location of Reductant Solution Injections • Shallow Zone Extraction Well April 8,2013 LIBBY in September and October 2010 for the 0.64 O 100-Foot Sand Zone Monitor Well OJ Full-Scale In Situ Remediation Program <3 O� 0 =40 to 180 ft bgs ♦ 100-Foot Sand Zone Extraction Well MAY = 115 to 180 ft bgs ❑ Intermediate Zone Monitor Well BOG =40 to 180 ft bgs (in Sept./August 2012) • Intermediate Zone Extraction Well 5 i = 115 to 180 ft bgs (in Sept./August 2012) 22 58 5 ® Deep Zone Monitor Well MW-441 NS MW-214(1-8) eDee p Zone Extraction Well -22.47 -21.76 14 <0 2# MW-447rS 5116D BMW=443 WALKER LANFr�g.,00 NS BMW-401 22.42 ®NM (24.77) ® NM o California Water Service Municipal Well <3 @ - ? <3 508 2.47 dl 51161 NS 3.97 M - 06 627 3 NM 5 ® Domestic Well -106 1 THEI MA NS MW-447 D MW-442 N NS a Irrigation Well -22;00-? MW-2 -23.56 Colombini 3 5 -22.58 -22.56 MW-439(1-6) NS Colombini 3 21.2# 1;790 THO Y -22.50 7 @ ® Colombini 2 20 1;800 MW-448 S NS NM dl NM MW-211 ?, <0.2/<0.2 MW-325 Well ID 22.05 -22.31 1<10 2.95/2.96 2,730 /3 <3/<3 -22.01 Groundwater Elevation Measured on 1.96 @ ? Mw-aa9 D -2780 CWS-62 April 8, 2013 in Feet Above Mean -22.61 Colombini 2 ® 8,550 ®C bini 1 .? dl NM @ Did Not Pump On Sea Level .4-306 3.11 MVV-z lu 81600 ? MW-448 D NM -22:50 -23.02 .12 , 3.66 8 20� 7 ' S Concentration of Hexavalent 13 MW-209 MW-449 S MW-444- bini 1 O/ - - -22:63 3,880 -23.33 dl _ 4 Chromium in Micrograms per Liter: 1 �0 W 2 1,930 W-467 3900 NS 4.22/4.22 = Detections for Primary M 7rr�. / MW-6 1,940 ? Mw-328 4 @ �? MW-446 and Duplicate Samples MW-212 •/ 2)- - -14 -2x85 23 0 8 -22.43 S $ 23.97 Concentration of Total Dissolved 94.5 @ 1i'-� A:j 20 W 1 -400 NS ?3.2$ �� NS Chromium in Micrograms per Liter: 140 MW-5 Mvy-1 i _/ 6_/� ?2.TVV_ � \ , <3/<3 = Detections for Primary and 15000 • 2300 Duplicate Samples - -,_,f� 5000 MW-321 (I-9) MW-326 MW-426 22 MW-202 a,.. �I4500 -23:18 -22=34 -22"00 MW-1 7:167,7.15 NS NS #,# Sample Result from January 2013 -22.42 MW-7 SO (D-1)10/10 1� 6@ 7�MW-436 )1'5 ? MW-431 1.42 @ W-208 MW-450 D MW-324(1-10) (- 22.2$ -22.43 @,@ Sample Result prior to January 2013 <3# -22.81 M 1 �1 -36.-49 _10.371000- MSD NS MW-213(1-7) MW-3 0 144 -61.60 Q 14.7 - < - MSI ?-6/-6 @ NS Not Sampled MW-450 S h 15 h 10 _ -59.17 164 2292 81.9 1.�'• �• _412( _ MW-411 A Screened in the Shallow, 100-Foot 2560 1. - 100 ��'� MW-424(1-2� MW=427(I-3IN LAIR 22: 5;160 C MW-465 00 MW-462 Sand, and Intermediate Zones 2600 FRANKLIN HI a O_ 23.26 -21'75 MW-434 scHooL r? 5;200 O-6 (" > Ivivv-46-i (D 2) -21.86 2 !.__ ~ -? -22.04 © Pumping Well 't3� MW-322 ��' NS/ # -21:50 NS 7$ P 9 O _22:85 <10/<10 5 MW-429(1-4) 22- 14.3 -3 4 __�W'425 MW-423 / MW-422 MW-430--21:171 ` 6' N@ (-21.47) Anomalous Data/Not Contoured -2 03�MW-320 22:12 29 MW-420 -21.59 NS ,21 w / ? Contour of Equal Groundwater -22.56 MW-310 MW-325 NS -21.51 NS <10/<10 SO = 220p� ' q 1130 49.1 n. -22.01- NS_ -21'78 NS 6@ MW-433 �� Elevation 49 2.9 7.82 @ 6.1-@ N @ <3 @ �V-41 n - M 4 ® - - -21.63 MW-323 -22.90 n. 8 J MW-440 Ng � Direction of Groundwater Flow -22:75 MW-327 <0.2 n, -21.35 �6"@ 6.63/6.64# -22:50 <3 ? -Z�' NS MW-435 - - 8/7# NS MW-428 _ °- @ ' -?� - MW-437 Isoconcentration Contour of @ -21.36 �. MW-438 MW-421 CWS-20 7 -22.23 ? -22.41 i Total Chromium; 6 NS -21.02 -21.65 Did Not'Pump On NS 1 CWS-52 N8 /50 @ NS NS April 8,2013 g @ ? Did Not Pump On @ Queried where Inferred; 3 @ 9 @ t7I Iv :11 /5.05 - ? April 8,2013 7/7 Dashed where Approximate. 1 11 1 IAN 6/6 q1W-432 0.73 -21.14 <3 HINKLEY NS ® 0 650 6 @ Feet D U D E K Figure 6 SPX Cooling Technologies Groundwater Elevations and Chromium Concentrations in the Intermediate Zone in April 2013 3909-21 AUGUST 2013 Stockton,California