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MW-401 WELL LOCATED U 620' NORTHEAST - LEGEND MW-302 Background Current Proposed 1/9/2008 4/24/2012 ULBC SHALLOW ZONE WELLS MW-401 Background Current proposed 1/9/2008 4/24/2012 ULBC Nitrate as N 3.5 NA 10 Nitrate asN at /`) MW-5 O MONITOR WELL (mg/L) 3.7 NA 10 SulfArsenic(WJL) <5 16 50 S-2 ® RECLAMATION WELL Sulfate(mg/L) 16.9 21.2 22 Arsenic((gg/ <5 5.0 10 MW-211 Arsenic(pg/L) <5 5.0 10 Chromium(µg/L) <10 <10 25 Chromium(pg/L) <5 5.0 25 Hexavalent <10 1.35 25 ADRIENNE AVE 100-FOOT SAND WELLS MW-21 Q Chromium( /L) Hexavalent <10 1.11 25 Iron(pg/L) 1671 123 300 MW-411 O MONITOR WELL Chromium(pg/L) MW-302 Manganese S-6 ® RECLAMATION WELL Iron(pg/L) 93 70 300 (p8/L) <10 <10 50 Manganese <10 <10 50 TDS(mg/L) 377 333 490 INTERMEDIATE ZONE WELLS ' `' IVI Former Phase TDS(m L) 284 253 450 MW-1 ❑ MONITOR WELL MW-209 RETORT PIT MW-445 1-1 Injection AreaL MW-211 Background Current Proposed -3 ® RECLAMATION WELL (Supplemental) 1/21/2008 4/24/2012 ULBC W_207 MW-2 4 MW-106 _�•�NW-20 Nitrate as N NA 10 DEEP ZONE WELLS FORM O _2b6' ° • Sulfate(mg/L) 29.6 26.2 38.5 MW-460 ® MONITOR WELL RUNOFF o ••• Arsenic <5 S.o 10 D-1 ® RECLAMATION WELL • pp o • • • 9 •, o • Chromium( /L) <10 31 25 RETENTION o o • • Hexavalent POND MW-6 °� O Back round Current proposed <30 1.96 25 -X X- • o • Mw-210 1/9/2008 4/24/2012 ULBC Chromium(pg/L) FENCE o ° ° 0 0 NitrateasN Iron(WJL) 241 148 313 DEEP INJECTION ••u. °�: : : : 0% / 0Ile 0500 000 •I (mg/L) 7.1 NA 10 Manganese <10 <10 So ° POINT (55 to 115 ft) (2008) 3 • O O • o o • • WATER Arsenic(pg/L) <5 15.1 29 DS(mg/L) 398 356 517 SHALLOW INJECTION • • ❑ ° o ° O o �Oo 0010 1 ••• • NK Chromium <s 41 10 MW-467 • POINT (55 to 85 ft) (2008) • • MV�104 1 1 TW-14 Chromium(µg/L) ao Si zs Hexavalent o • 04 O o1-70 ° ° ° 00 0 1zl ••• • <10 1 25 MW-328 ULBC UPPER LIMIT BACKGROUND of • • Chromium(µg/L) MW-5 • . ° 0 MW-210 0 0 ° � � 01 ••• W-15 Iron( L) 161 112 300 CONCENTRATION 0 o O o s 02 "� 0 1 • • Manganese MW-400 O �� 0 • • <10 <10 50 BOLD VALUES EXCEED PROPOSED ULBC MOW-4040 0 A ° ° o I�al �BLDG • • (pgA) TDS(mg/L) 4as 336 490 (SUPPLEMENTAL) WELLS WERE ADDED FOR ° ° MW-361 Q� of ❑ . . DAWES A Q 0MW-1071 ° 0 0 0 0 0 ° 000 °01° IMW-447S •'• SUPPLEMENTAL DATA, BUT Fo r Phase 11 ° to IMW-4470 s MW-10� ° ° 0°10 1 • OM 204 0 o ARE NOT REQUIRED PER THE In c ion Area Q - a- a- a- a- a- a- a- a- a- a- a- • • • 0 1 1'0 WASTE DISCHARGE REQUIREMENT/ MW-7 • • • • • • • • • • • • •0. •q • • • J o EIQ • • • • • • • • • • • D� • • • • • 0 0 0 MONITORING AND REPORTING MW-20 W-1 -12 / MW-8 MW-4 • • 00 0°0 000 1-9 MW-301 PROGRAM. • • • • ° �M W-448S.0o MW-321 Q / / • • °0°-MW-448D o J = ESTIMATED VALUE Q / FOOTBALL • ••❑BLDG o ° 00 • • • • • • • • • CARROL AVE UJ NOT DETECTED AT MDL 0 w FIELD ••• ° o °o° I-1 -- = NO DATA • •• °0° S-s ml W 324 NA = NOT ANALYZED • • BUILDING BLDG o o -16 MW-304 4th Qtr/Compliance' Current Proposed mg/L = MILLIGRAMS PER LITER 10/zz/zoos 4/z6/zolz uLBc pg/L = MICROGRAMS PER LITER a M $ MW-363 0 Nitrate as N 0 MW-202 Background Current Proposed MW-7 Background Current Proposed Z 0q-1 1 (mg/L) 2.2 NA 10 TDS = TOTAL DISSOLVED SOLIDS 1/9/2008 4/24/2012 ULBC 1/9/2008 4/25/2012 ULBC ❑ 0 $-7 O O Sulfate(mg/L) 31.6 41.6 60 U NitrateasN NitrateasN MW-320 J ° ° MW-205o • • • • • • • • • • • • 7.5 NA 10 8.6 NA 11.2 IELD o o O Arsenic( L) <5 41 13 1 = 4TH QUARTER/COMPLIANCE DATA UTILIZED AS (mg/L) (mg/L) OUSE m °O° c' o°o OTW-17 • Chromium Hexavalent 24 12 zs BASELINE SAMPLING EVENT FOR WELL MW-304. ON Sulfate(mg/L) 45.2 47.8 58.8 Sulfate(mg/L) 42.0 43 54.6 O O __ Arsenic(pg/L) <5 31 10 Arsenic(pg/L) <5 4J 10 BASEBAL O O°0 Chromium(pg/L) 8.27 25 Es Chromium(pg/L) <10 10 25 Chromium(pg/L) <10 81 25 O FIELD °o° J _° Iran(pg/L) <100 3s3 300 0 SUPPLEMENTAL INJECTION O Hexavalent Hexavalent •• Q 0 00 Manganese <10 <10 50 POINT (2010) ti <10 4.46 25 <30 5.35 25 (pg/L) U Chromium(pg/L) Chromium(pg/L) p m 0 0 O Iron(pg/L) 227 281 295.1 Iron(pg/L) 287 199 373 300 ° ° o O EW-1 TDS(mg/L) 8931 828 808.5 Manganese Manganese OFFICE ~ L <10 <10 50 L <10 <10 50 - O ( ) ( g TO (mg/L) 556 639 612 TDS(m L) 577 620 634.7 MW- 22 • • • • • • • • • • • • • • • o MW-9 • • • • • • • • • • • • • • • • Z MW-310 Background Current Proposed Q 0 (Supplemental) 1/21/2008 4/24/2012 ULBC U Nitrate asN 6.4 NA 10 FRANKLIN HIGH � (mg/L) v MW-323 E z Sulfate(mg/L) 16.5 44.6 21.5 SCHOOL = Arsenic(pg/L) 6.0 4J 10 �l Chromium(pg/L) <10 10 25 0 FEET 250 Hexavalent <10 8.36 25 SCALE c MW-201 Chromium( L) C Iron(pg/L) 243 362 316 U O ManganeseFL <10 <30 50 MW-201 Background Current Proposed MW-325 Background Current Proposed (pg/L) Q) 2/4/2008 4/30/2012 ULBC (Supplemental) 1/21/2008 4/24/2012 ULBC TDS(mg/L) 377 789 490 Nitrate as N Nitrate as N GERTRUDE AVE (m8/L) 14.3 NA 15.7 (mg/L) 5.0 NA 10 M W H co Sulfate[mg/L) 49.4 48.8 64.2 Sulfate(mg/L) 17.3 30.1 22.5 MW-304 MW-327 p Arsenic(pg/L) <5 3J 10 Arsenic([WL) 9.0 5.0 11.7 FORMER MARLEY COOLING TOWER COMPANY Chromium(pg/L) 17 14 so chromium(pg/L) ao sl zs MW-310 STOCKTON, CALIFORNIA Hexavalent <30 10.7 25 Hexavalent <10 7.82 25 Chromium(pg/L) Chromium(pg/L) MW-325 COMPLIANCE WELL Iron(pg/L) 390 357 429 Iron(pg/L) 157 307 300 ADELBERT AVE Zo Mangan se <10 <10 so Mangan se <10 ao so ® ANALYTICAL SUMMARY ADELBERT AVE APRIL 2012 TDS(m/L) 786 935 864.6 TDS(m L) 330 610 450 M -364 FIGURE 4