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MW-401 WELL LOCATED Background current Proposed 620' NORTHEAST MW-302 1/9/2006 10/23/2012 ULBC LEGEND MW-401 Background Current Proposed Nitrate L)N 3.5 NA 10 (mg/L) 1/9/2°°6 1°/23/2D12 ULBC Sulfate(mg/L) 16.2 NA so SHALLOW ZONE WELLS Nitrate as N 3.7 NA 10 Arsenic( L) <5 NA 10 (mg/L) Chromium (µg/L) <l0 4, z5 MW-5 O MONITOR WELL Sulfate(mg/L) 16.9 NA zz Hexavalent S-2 0 RECLAMATION WELL Arsenic(pg/L) <5 NA 10 Chromium pg/L)/L) <lo NA 0 ADRIENNE AVE 100-FOOT SAND WELLS MW-211 Chromium( /L) <10 <10 25 Iron(Ng/L) 1671 NA 300 MW-210 Hexavalent <10 NA 25 Manganese Chromium(jig/I-) (�L) <10 NA 50 MW-411 O MONITOR WELL Iron(pg/L) 93 NA 300 MW-302 TDS(mg/L) 3n NA 490 S-6 ® RECLAMATION WELL Manganese <10 NA 50 o� 1µg/L) INTERMEDIATE ZONE WELLS TDS(mg/L) 284 NA 450 Former Phase I MW-1 ❑ MONITOR WELL FORMERMW-211 Background Current Proposed Mw-209 RETORT PIT MW-44511 Injection Area (Supplemental) 1/21/2008 10/23/2012 ULBC 1-3 o RECLAMATION WELL Nitrate as N CN O 7 0 NA 10 MW-106 ❑°� T20 (mg/L) DEEP ZONE WELLS W-207 MW-2 - • • Sulfate(mg/L) 29.6 NA 38.5 N FORM 0 -206.. ° • Arsenic(µg/L) <s NA 10 MW-460 ® MONITOR WELL N RUNOFF ° e o 0 ° ••• Chromiumvalent L) <10 3, zs D-1 ® RECLAMATION WELL • • • Hexavalent <10 NA 25 o RETENTION a Mw_6 Chromium(µg/L) -X x- FENCE ° • 1 ° O O • • Iron(µg/L) 241 NA 113 - POND O • Background Current Proposede e O O Mw-z10 Manganese <10 NA DEEP INJECTION • o 0-1050 ° ° 1/9/zoos 10/z3/z01z ULBC (pg/L) e e • -212 O O ° ° •° O O °O° O°1. 1 • WATE Ni(m6/U N 71 NA 10 TDS(mg/L) 398 NA POINT (55 to 115 ft) (2008) � ANK Sulfate 22.3 NA 29 SHALLOW INJECTION Q • e My�10q ° ° ° ° ° �O0 °ol° I °•• TW-14e Arsenic <s NA 10 MW-467 POINT (55 to 85 ft) (2008) U ° • Chromium(pg/L) <10 4J 25 • O 01-70 ° ° ° O° °ocl .°° e0 MW-328 ent ULBC UPPER LIMIT BACKGROUND z MW-5 e ° °MW-21o� o ° 0 1 • -15EhnavaHexl(µg/L) <10 NA zs CONCENTRATION Q o • S°2 �+ 01 1 ••• e• g/L) 161 NA 300 MW-400° (oW-a04 0 ° ° 0: • • • • BOLD VALUES EXCEED PROPOSED ULBC O O I I nese° MW-361 O1 O1 1 ❑ '; . L, <1D NA SDDAWES AVE OMW-107 Oo 0❑M 0 • -447 S-17 • ( )O yy��, ��yy g/L) 445 NA 490 SUPPLEMENTAL WELLS WERE ADDED FOR w FO r Phase II 1 ° ° ° MVn 319-4� �-�� • °.° SUPPLEMENTAL DATA, BUT Q • MW-10,P ° ° OI 1 ®MV-204 0 o ARE NOT REQUIRED PER THE Inj c ion Area O 1 a „ „ „ 1119111911191119066 e e • • • 0 0 0 MW-450S❑ �0 WASTE DISCHARGE REQUIREMENT/ MW-7 e • e e e e • ..,e • • • J 0 o e e e , . . eee e e ❑ e e e e e o MW-450D S-16 ° ° MONITORING AND REPORTING MW-20 _1 _1 MW-8 MW-4 • • • 4-13 000 6000 MW-321 w-301 PROGRAM. �� • • •�BL�GS-��° W-448S CARROL AVE J = ESTIMATED VALUE ° FOOTBALL • • 00 0 • • • • • • • • • • ° UJ = NOT DETECTED AT MDL FIELD •°• ° 0 •°oo I-1 -- = NO DATA \ \ • e •• S-90 S-8 °o° S_g ■MW 324 NA = NOT ANALYZED 00 \ ' • BUILDING BLDG o 0 ' Proposed mg/L = MILLIGRAMS PER LITER W • • • • • • • • _16 MW 304 4th Qtr/Com liance Current 10/22/2008 10/24/2012 ULBC pg/L = MICROGRAMS PER LITER Background Current Proposed M $ C' S^ 63 ONitrate as N MW-202 1/9/2008 10/24/2012 ULBC z_ v 0q-1 1 (mg/L) 2.2 NA 10 TDS = TOTAL DISSOLVED SOLIDS Nitrate as N ° ° MW-205 (mg/L) 7.5 NA 10 FIELD MW-320 J 0 M O o° e e e e e • • • • • • • Sulfate(mg/L) <5 NA 60 x 5 0 0 0 0 0 e Arsenic(pg/L) <s NA 13 1 = 4TH QUARTER/COMPLIANCE DATA UTILIZED AS Il Sulfate 45.2 NA 58.8 HOUSE m 0 O Chromium(pg/L) 24 11 25 cn cD o o TW-17 BASELINE SAMPLING EVENT FOR WELL MW-304. w. Arsenic(WJI-) <5 NA 10 BASEBAL 000 Z O Hexavalent __ NA 25 Chromium(µg/L) <10 71 25 O O Chromium(pg/L) Hexavalent 0 FIELD °0° J ° Iron(M/L) <100 NA 300 SUPPLEMENTAL INJECTION o Chromium( L) <10 NA 25 •• 0 O m "O° Manganese <10 NA 50 POINT (2010) Cl Iron(pg/L) 227 NA 295.1 - ° Cy Manganese MW-300 ° ° oO TDS(jig/l.) 693, NA 808.5 FOCUSED SUPLEMENTAL C <10 NA 50 ° EW_1 ("9/L) _ � MW-310 Background Current Pro INJECTION POINT SHALLOW O TDS(mg/L) 556 NA 612 MW_7 Background Current Proposed OFFICE C/) posed 1/9/2008 10/23/2012 ULBC MW_ 2 (Supplemental) 1/21/2008 10/24/2012 ULBC AND INTERMEDIATE (2012) o Nitrate as N 8.6 NA 11.2 MW- • • • • • • e e e e e • • • • • Z Nitrate as N 6.4 NA lD FOCUSED SUPLEMENTAL (mg/L) O Sulfae(m)g/L) 16.5 NA 21.5 INJECTION POINT INTERMEDIATE � Sulfate(mg/L) 42.0 NA 54.6 Arsenic <5 NA 10 z Arsenic(pg/L) 6.0 NA 10 (2012) o chromium( L) ao 61 zs MW-323 Chromium(WJL) <10 91 zs (n Hexavalent <SO NA 25 = Hexavalent L-X-� Chromium(pg/L) <10 NA 25 Chromium( L) d. Iron(pg/L) 287 NA 373 Iron(WI-) 243 NA 316 0 FEET 250 Manganese <SO NA 50 MW-201 Manganese <10 NA Q:0 SCALE N ( L) W/L)� TDS(mg/L) 577 NA 634.7 TDS(mg/L) 377 NA no Background Current Proposed MW-201 2/4/2008 10/24/2012 ULBC MW-325 men Background Current Proposed MW-425 El L� Nitrate as N (Supplemental) 1/21/2008 10/23/2012 ULBC Z 14.3 NA 15.7 Nitrate as N M W H GERTRUDE AVE (mg/L) 5.0 NA 10 Sulfate(mg/L) 49.4 NA 64.2 (mg/L) � Sulfate(mg/L) 17.3 NA 22.5 MW-304 MW-327 Arsenic( L) <5 NA 10 ° Chromium(pg/L) 17 14 so Arsenic(Ng/L) 9.o NA 11.7 FORMER MARLEY COOLING TOWER COMPANY Chromium(Ng/L) <10 g zs MW-310 STOCKTON, CALIFORNIA y Hexavalent <10 NA 25 Hexavalent Chromium(pg/L) <10 NA 25 MW-325 Iron(µg/L) 390 NA 429 Chromium(pg/L) COMPLIANCE WELL d Iron(µg/L) 157 NA 300 Manganese ADELBERT AVE ANALYTICAL SUMMARY Z <10 NA 50 Manganese W ADELBERT AVE (pg/L) (pgan) <10 NA SD ® OCTOBER 2012 TDS(mg/L) 786 NA 864.6 TDS(mg/L) 330 NA 450 M -364 FIGURE 4