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XzX LEGEND O Shallow Zone Monitor Well P BGG CWS-35 CARDINALAVE --o Did Not Pump On' Location of Reductant Solution Injections • Shallow Zone Extraction Well April 26,2012 ILIBBY in September and October 2010 for the o.76 3 O 100-Foot Sand Zone Monitor Well OJ X33 Full-Scale In Situ Remediation Program O\ =40 to 180 ft bgs ♦ 100-Foot Sand Zone Extraction Well 00�A< �� = 115 to 180 ft bgs ❑ Intermediate Zone Monitor Well CO �� ■ Intermediate Zone Extraction Well MW-445 ® Deep Zone Monitor Well -21.79 MW-441 NS MW-214(1-8) le Deep Zone Extraction Well -18.55 11/11-/-21.851 1 i - - -----7- 16D 0 MW-443 WALKER LANEC.-nee NS /MW-401 <0.2MW=447 S------- ®NM NM ® NM o California Water Service Municipal Well <3 -22 94 2 0551161 NS19 4.13/4.11 M -206 106 2;960 4 NS NM 5 6/6 N Domestic Well Y MW- MW-442'' ? MW-2 MW-447 D (-21.46) NColombini 3 NS a Irrigation Well OD 7 5 /-22.07 23.49 MW-439(1-6) NS MW-325 Well ID -20' 1.5:90 2,150 THO Y -23.32 ® Colombini 2 -23.32 / 2,290 Colombini 3 Groundwater Elevation Measured on MW-211 I ? 1 203 MW-448 S NS NM d NM April 23, 2012 in Feet Above Mean -19.84 `1. 7 -23111 9 4 46 <0.5 Sea Level �.0 ,3 Colombini 2 1.96 2 / W-10 2,540 � CWS-62 Concentration of Hexavalent 3 -,50 2,570 ®Colombini 1 NM Did Not Pump On 7.82 MW_ 10 MW 0� 2 MW-448 D NM 3.11 Chromium in Micrograms per Liter: April 26,2012 MW X09 00 ? -23.98 3.08 5 NS 4.22/4.22 = Detections for Primary p E .22. 2;360/2;350 23 2144 4 and Duplicate Samples n O 2 50� ? W . 2,460/2,440 NS Colombini 1 8 Concentration of Total Dissolved .22: MW-212 • MW 6 .2300 ? MW-328 5' MW-446 Chromium in Micrograms per Liter: -21.59 `1• 50 -1 -2 I -23.49 -23.42 <3/<3 = Detections for Primary and 94.53 MW T, 13 .2350 -400 6S NS Duplicate Samples 98/98 T" MW 5,00 1 1 Last Sampled on or before April 2010 MW-20 0 50' • ICP MW-321 (1-9) W-3 6 MW-426 ? Last Sampled in April 2011 -24.0-40.47 -23:00 2W710 1W 7 • 6 0.43 6S NS MW-431 3 Last Sampled in October 2011 1.42 `1. 3(D- -24.00'MW-324(1-10) 7� MW-436(1-5) -23.22 A Last Sampled in January 2011 M -2 8 5(S-=24c00=111 -37:28 -22.69 nncn NS (1-7) M 300 -59.19 18 1 -1033- MW-213 6/_6 NS Not Sampled -22.88 507/508 MW-41 A Screened in the Shallow, 100-Foot 5,120/5;1 510/(511 4 MW-424 I-2 O MW-427(1-3 L M` Sand, and Intermediate Zones 21.58 MW-434 5,410/5 FRANKLIN HIGH NS ) MW-461 (D 2) -22.92 c~n 23.16 © Pumping W211 MW-4 SCHOOL MW_ 22 NS w P 9 -23.13 _ -23:75 TRUD 6 -22,9904-<3 M '05 (I-4) z v ? NS (-21.58) Anomalous Data/Not Contoured 520/5213 17.4 MW-3 4 MW-425 ZMW-423 MW-430--23:05 A BMW-320 -23.29 2 MW-420 -22.64 NS 720 20 3 00 -22.39 MW;422 -23.10 MW-310 MW-325 NS 22.57 NS 3 = w ? Contour of Equal Groundwater n SNS -22 96� 3. 10.9/10.9 EW_1A 23:32 5 121 Ng AnFI RFRTNS 9' ? %MW-433 ��,2 Elevation 11/11 MW-323 (-23.97 X7.82 7 11 MW-410 M -464 ) $ MW-440 /NS � Direction of Groundwater Flow -23:07 MW-327 <0.2 -22.37 g" 6.44 ? NS MW-435 8 NS MW-428 b MW-437 MW-438 CWS 20 7 -22.47 Isoconcentration Contour of -23.33 � MW-421 - \ 1 -22.38 6 -22.00 -22.63 Did Not Pump On NS CWS-52 /50 Hexavalent Chromium; NS Ns April 26,2012 7 Did Not Pump On NS <3 7 10 n Iv .2274.223 N1-7 April 26,2012 7/7 Queried where Inferred; 1 11 1 IAN <31<3 3 MW-432 Ns Dashed where Approximate. -22 NS 4' NOTE: MW-4 and MW-212 HINKLIFY Ns were Contoured using October ® 0 650 6 2011 Concentrations. Feet D U D E K Figure A-7 SPX Cooling Technologies Groundwater Elevations and Chromium Concentrations in the Intermediate Zone in April 2012 3909-20 APRIL 2012 Stockton,California