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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 October 18,2012 LIBBY in September and October 2010 for the p3 81 66 O 100-Foot Sand Zone Monitor Well J � Full-Scale In Situ Remediation Program O� =40 to 180 ft bgs ♦ 100-Foot Sand Zone Extraction Well = 115 to 180 ft bgs ❑ Intermediate Zone Monitor Well 5� �� ■ Intermediate Zone Extraction Well MW-445 ® Deep Zone Monitor Well j -22.94 MW-441 NS MW-214(I-8) le Deep Zone Extraction Well 11/-11 " -22.72 -22.21 NS MW-401 <3 723 08 N NM NM N NM o California Water Service Municipal Well <3 @ 700/698 1.34/1.37 d NM NS 3.58 // MW-106 - 06 716/711 31<3 NM 5 ® Domestic Well NS MW-447 D MW-442 N Ns a Irrigation Well MW-2 i NM Colombini 3 5 -22.89 -23.86 MW-439(1-6) NS ? 19 2250 THO Y -24.85 7 @ N Colombini 2 20 2,300 MW-448 S NS NM d Colombini 3 MW-211 NM MW-325 Well ID -23• MW-449 D 2,470 9- 4 9 <0.2 -24.04 Groundwater Elevation Measured on 1.96 -23.73 Colombini 2 CWS-62 Oct. 18, 2012 in Feet Above Mean -2;480 3 N Colombini 1 NM Did Not Pump On MW 210 M -306 6,320/6,600 MW-448 D NM 3.11 @ October 18,2012 Sea Level 2434 3141314. . - 0.33 7 Concentration of Hexavalent MW-209 fin/' MW-449 S -24.34 MW-444 Colombini 1 O C =23.66 21860 -23.64 4/4 19 <3 Chromium in Micrograms per Liter: M 10 EW 2 11,720,750 W 467 2 930 Ns 4.22/4.22 = Detections for Primary N v M MW-328 4 @WArNFR a `26:0 MW-446 and Duplicate Samples MW-212 N0�s "� - -22 58 • • Qp�! . , t� 14 -23 90 0�, -26.37 8 Concentration of Total Dissolved 94.5 @ # 1w n p�11�r�'+500 -,p . ,, o �? -40o Ns NS Chromium in Micrograms per Liter: 98/98 . 24.�� 6-/�A' Es- - %J.,50 <3/<3 = Detections for Primary and �N., } T` MW-321 (I-9) ` Duplicate Samples 15,000 •-24.00 • -45.81 MW-326 MW-426 MW-202 ICU -49.5/51.6 -23.52 -23:60 �2S°�0 ' MW-1 �-©_� -22.35 MW-7 , iu�`v �yol)57/58 I 6 @ NS 7 @ MW-436 15 MW-431 #,# Sample Result from April 2012 1.42# W-20 MW-450 D © � ♦ MW-324(1-10) (" ) '24; -23.96 MSD �2 -24.70 @,@ Sample Result prior to April 2012 4 24108 24:00 � �1�w 17 0p 15.2) -23;rj0 10.0/1 Q1/97� ® nncl ¢S� ? 6 S6" NS Not Sampled MW-213(1-7) M 300 85 MW-450 S -58.977 -67.32 24 18 303 16 MW-412( - MW-411 n Screened in the Shallow, 100-Foot MW=424-(1-2) MW-427 I`3 IN LAIR r 2,880 FRANKLIN HI 4;360 -305 ( $ MW-4 Sand, and Intermediate Zones SCHOOL 4,400 S-6 (-21.51) MW-461 (D 2) 23.29 F _24.59 MW Ns w 24.59 © Pumping Well 23.922 4 N3 MW-429(1-4) ?400 v NS 21.47 Anomalous Data/Not Contoured Mw--4� TROD MW-425 " i 14.9/15.3 MW-3 4 MW-423 MW-430--2382 6 -23.62 _-MW-320 15/16 -23'29 MW-420 -23.45 NS Contour of Equal Groundwater -23.00 MW-422 a 1,030 -23.60 � MW-310 MW-325 NS �- -23.36 NS 3# w � Elevation q 1,050 <0.2 „ -23:26 5" SNS- -23.30 = 2400 EW-1 - # '3�� 6.1-@ NS A FIRFRTNS 6'@ %MW-433 �� <3 $.82 �%t 7# <3 @ MW-410 M -464 MW-440 NS 18 Direction of Groundwater Flow MW-323 -23.84 � ? 23.39 -MW-327 <0.2/<0.2 -23.44 6"# NS MW-43 ?- 6.05 -23.36 <3/<3 D - <3 NS MW-428 # b MW-437 # MW-438 CWS-2o 7 23.64 Isoconcentration Contour of -22.75 � -23.55 � 6 -22.61 Did.Not Pump On Ns CWS-52 /5p Hexavalent Chromium; NS NS Octo�1-8.2012 Did Not Pump On NS <3# # MW-421 nut 4;22L4.22 @� ? October 18,2012 7/7# Queried where Inferred; 7 -23:40 <0.2 Dashed where 1 11 1 IAN NS <3/<3@ MW-432 Approximate. 9(sampled in July 2012) -23.18 <3 NOTE: MW-4 and MW-212 ® o seoHIN LEY 6S were Contoured using October Feer 2011 Concentrations. D U D E K Figure 7 SPX Cooling Technologies Groundwater Elevations and Chromium Concentrations in the Intermediate Zone in October 2012 3909-20 OCTOBER 2012 Stockton,California