Document 93xd1oKXNo3oxZjGDB1jqnwvD

PLAINTIFF'S EXHIBIT UC-1888 BROWNSVILLE NAVIGATION PISTRICT ; PRESENTATION : 24 AUGUST 1993 -UPDATE- i DIVESTITURE / RCRA FACILITY INVESTIGATIONS i i: UNION CARBIDE - BROWNSVILLE, TX SITE Presented by Robert E. O'Bryan reo25:bv270-l i BRB 0684 - I! rrs AGENDA OBJECTIVES; ' PROVIDE UPDATE OF ENVIRONMENTAL INVESTIGATIVE ACTIVITIES I. BACKGROUND A. GENERAL SITE HISTORY B. REGULATORY STATUS C. SITE HYDROGEOLOGICAL SETTING 3 3-4 4 II. ENVIRONMENTAL ASSESSMENT A. TWC RISK REDUCTION RULES CRITERIA B. EVALUATION PROCEDURES 5 6 HI. INVESTIGATIVE RESULTS / CORRECTIVE MEASURES A.. SITE WIDE CONSTITUENTS / TECHNICAL POSITION B.. LOCATION SPECIFIC CONSTITUENTS / CORRECTIVE MEASURES 7 8-12 reo25:bv270-2 BRB 0685 I I. BACKGROUND 3 GENERAL SITE HISTORY - 462 ACRES OF LEASED BND PROPERTY (1958 - 1993; 2 YR RENEWAL OPTION) i - PREVIOUSLY USED BY 3 OTHER FACILITIES (SYNTHETIC FUEL PRODUCTS) l - UCC OPERATED FACILITY FROM 1961 - 1983 (WATER SOLUBLE - OXYGENATED-MATERIALS); DISMANTLED (EXCEPT BLDGS / H2O TOWER) BY MID 1992 REGULATORY STATUS BALL MILL RESIDUE BASIN (BMRB) - ~1 ACRE HAZARDOUS WASTE FACILITY; 1975 - MID 1983 - CLEAN CLOSED 1986; EPA "REVOKED" CLOSURE 1987 - 1989 - 1990; SLUDGE / SUBSOIL REMOVAL - MAR 93; CLOSURE BY REMOVAL EQUIVALENCY DEMONSTRATION PETITION SUBMITTED TO EPA EPA CURRENTLY REVIEWING PETITION; ANTICIPATE SEP 93 RESPONSE reo25:bv270-3 BRB 0686 LBACKGROUND (CONT'D) 4 TWC RCRA PERMIT - 1990; SITE RCRA FACILITY ASSESSMENT CONDUCTED - NOV 92; TWC RCRA PERMIT ISSUED [BMRB POST-CLOSURE CARE AND RFI - 26 SWMUs] SITE GEOLOGICAL / HYDROGEOLOGICAL SETTING i1 - AVERAGE RAINFALL 26" AVERAGE TEMPERATURE 740 F EVAPORATION EXCEEDS RAINFALL 31" / YEAR - RIO GRANDE 100 YEAR FLOOD PLAIN; BAY-ESTUARY COASTAL ZONE - FLAT; GENTLE NORTHEAST SLOPING 8-10 FEET ABOVE SEA LEVEL - 6 STRATIGRAPHIC UPPER ZONES [ZONES 2, 4*, 6 - AQUIFERS; * DISCONTINUOUS AQUIFER] GROUND WATER FLOW EAST -NORTHEAST; 2' - 6' / YEAR - NO TIDAL EFFECTS - GROUNDWATER CLASSIFIED VERY "SALINE TO BRINE" [30,000 - 40,000 mg/1 TDS] reo25:bv2704 BRB 0687 II. ' ENVIRONMENTAL ASSESSMENT 5 A.TWC RISK REDUCTION RULES (R3) CRITERIA - R3 EFFECTIVE JUN 93; ALLOW CLOSURE TO RISK BASED CRITERIA i - CLOSURE UNDER 3 STANDARDS: - STANDARD 1 BACKGROUND OR PQLs - STANDARD 2 HEALTH-BASED RISK CONCENTRATION i VALUES GENERATED PER TWC PROCEDURES; REQUIRES DEED RECORDATION OF CLOSURE - STANDARD 3 OTHER RISK BASED CRITERIA PROPOSED BY THE OWNER AND IF ACCEPTED, REQUIRES DEED RECORDATION AND USUALLY POST-CLOSURE MONITORING - DIFFERENT R3 CRITERIA APPLY FOR DIFFERENT MEDIA [SURFACE SOILS (<2'), DEEPER SOILS, GROUND WATER] - DIFFERENT CRITERIA ALSO APPLY TO LAND USE [RESIDENTIAL, INDUSTRIAL] reo24:bv270-5 BRB 0688 6 II. ENVIRONMENTAL ASSESSMENT | (CONT'D) i B. EVALUATION PROCEDURES i 1. MASTER ANALYTE LIST DEVELOPED (~ 90 COMPOUNDS) ~ 196 COMPOUNDS REASONABLY BE PRESENT (PROCESSES, PAST ANALYSES, CONTAMINANT PROPERTIES)-ELIMINATE COMPOUNDS NOT EXPECTED TO PERSIST, LAB USE ONLY, MAINTENANCE MATERIALS i' RFI SWMU - ~ 71 APPENDIX IX COMPOUNDS DIVESTITURE - MASTER ANALYTE LIST [SPECIFIC TO WHAT WAS KNOWN ABOUT THAT SPECIFIC LOCATION] 2. ANALYTICAL RESULTS ENTERED INTO DATABASE 3. CRITERIA DEVELOPED FOR R3 STANDARD CLOSURES AND DIFFERENT MEDIA USED TO SCREEN SAMPLE RESULTS BY SPECIFIC ANALYTES. LOCATION. AND MATRIX ! 4. RESULTS USED TO DETERMINE R3 STANDARD reo25:bv270-6 i i BRB 0689 III. INVESTIGATIVE RESULTS / : CORRECTIVE MEASURES 7 O OF THE 506 DIVESTITURE / RFI SAMPLES, MOST OF THE ANALYTES WERE < STANDARD 1 SITE WIDE CONSTITUENTS / TECHNICAL POSITION 3 METALS (e.g., arsenic, cobalt, copper, and lead) > STD 2 [As >3.27 ppm; (4 - 20 ppm)] [Co >53 ppm; (56 - 71 ppm)] [Cu >85 ppm; (85 - 2500 ppm)] [Pb >150 ppm; (160 - 920 ppm)] i - REFLECTIVE OF GENERAL INDUSTRIAL AREA BACKGROUND O NO CORRECTIVE ACTION REQUIRED BRB 0690 i III. INVESTIGATIVE RESULTS / CORRECTIVE MEASURES (CONT'D) j: LOCATION SPECIFIC CONSTITUENTS / CORRECTIVE MEASURES O POLYNUCLEAR AROMA TIC HYDROCARBONS @ TANK 1241 (FORMIC ACID) AREA i CONSTITUENT HIGHEST CONC. (ppm) STD 1 (ppm) STD 2 (SAI) (ppm) Benzo(a)pyrene Chrysene : 7.6 9.6 0.66 0.78 0.66 0.78 - ORIGIN OF PAHs UNKNOWN - POSSIBLE PREDECESSOR COMPOUND 3 CORRECTIVE ACTION: LANDFARM 3 MERCURY [shallow soil] @ GENERAL FACILITY AREA [> 20 ppm; (23 ppm)] - VALUE IS ISOLATED; NOT SIGNIFICANTLY DIFFERENT ANALYTICALLY FROM CRITERIA - AREA WHERE WASTES WERE NOT MANAGED [MODEL OR SAMPLE FOR LEACHING] 3 NO CORRECTIVE ACTION REQUIRED reo25:bv270-8 e> BRB 0691 III. INVESTIGATIVE RESULTS / I CORRECTIVE MEASURES (CONT'D) 9 3 MERCURY [shallow soil] @ SWMUs Q / E (GARBAGE AREA / CARBON LAKE) [> 20 ppm: (27 ppm)] - AREA OF FACILITY LIKELY TO BE CLOSED AND CAPPED DUE TO ASBESTOS - POSSIBLE DISPOSAL OF OTHER MATERIALS 3 CORRECTIVE ACTION: CAP AND CONTAIN 3 ASBESTOS @ SWMU R (INSULATION DISPOSAL AREA) AREA OF FACILITY LIKELY TO BE CLOSED AND CAPPED - POSSIBLE DISPOSAL OF OTHER MATERIALS 3 CORRECTIVE A CTION: CA P AND CONTA IN 3 It'll, LEAD, MERCURY, BIS (ETHYLHEXYL) PHTHALATE @ SWMU Z (OLD OIL SKIMMER PITS) - ADDRESS SPECIFIC RFI ANALYTES OF CONCERN AND TO REMOVE TPH 3 CORRECTIVE ACTION: REMOVE AND IANDFILL reo25:bv270-9 BRB 0692 III. INVESTIGATIVE RESULTS / CORRECTIVE MEASURES (CONT'D) 10 MERCURY [shallow soil] @ SWMUs Q / E (GARBAGE AREA / CARBON LAKE) [> 20 ppm; (27 ppm)] - AREA OF FACILITY LIKELY TO BE CLOSED AND CAPPED DUE TO ASBESTOS - POSSIBLE DISPOSAL OF OTHER MATERIALS i 4 CORRECTIVE A CTION: CAP AND CONTAIN ASBESTOS @ SWMU R (INSULATION DISPOSAL AREA) - AREA OF FACILITY LIKELY TO BE CLOSED AND CAPPED - POSSIBLE DISPOSAL OF OTHER MATERIALS - CORRECTIVE ACTION: CAP AND CONTAIN TPII, LEAD, MERCURY, BIS (ETHYLHEXYL) PHTHALATE @ SWMU Z (OLD OIL SKIMMER PITS) - ADDRESS SPECIFIC RFI ANALYTES OF CONCERN AND TO REMOVE TPH - CORRECTIVE ACTION: REMOVE AND LANDFILL reo25:bv270-10 BRB 0693 III. INVESTIGATIVE RESULTS / CORRECTIVE MEASURES (CONT'D) 11 4 REFER TO CHART BELOW @ SWMU T (MIXED ACID / RESIDUE OIL POND), SWMU AOC No. 1 (LEAKING UNDERGROUND TANK), SPECIAL AREA CG (SOUTH FIRE TRAINING AREA) CONSTITUENT ii . 1,1 Dichloroethene 1,1 Dichloroethene 1,1 Dichloroethene Benzene Vinyl Chloride SWMU/SA T CG AOC No.l AOC No.l AOC No.l HIGHEST CONC. (ppm) 0.88 1.0 0.99 1.9 0.65 STD 2 (ppm) 0.7 0.7 0.7 0.5 0.2 - TECHNICAL AND REGULATORY ARGUMENTS ARE BEING DEVELOPED TO JUSTIFY NO ACTION - CONCENTRATIONS ARE CLOSE TO STD 2 - NONE OF THE SURROUNDING WELLS SHOWED COMPARABLE CONCENTRATION - BIASED SAMPLING; HIGHEST CONCENTRATIONS - GROUNDWATER NOT POTABLE - GROUNDWATER DOES NOT CONNECT TO DRINKING SURFACE WATER SOURCE NO CORRECTIVE REQUIRED reo25:bv270-ll BRB 0694 III. INVESTIGATIVE RESULTS / CORRECTIVE MEASURES (CONT'D) 12 UCC TO ADDRESS THE FOLLOWING AREAS REGARDING DIVESTITURE - BASED UPON VISUAL IMPACT OR NON APPENDIX IX ANALYTES: - TANK 2301 NON HAZARDOUS WASTE (''PURPLE'1 DIRT) - TANK 4301 NON HAZARDOUS WASTE (''OILY DIRT") - IRON CATALYST PILES - SWMU Z (OLD OIL SKIMMER PITS) reo25:bv270-12 f BRB 0695 6900232 7-8-93 BRB 0696 t 6900232 7-8-93 j S0UD WASTE MANAGEMENT UNITS J UNIT NAME ZONE 1 ag 1 CoO I%S K i I T g i3g 1 8> | 1 fc 5 5 > o 2C P IS s 1Si t e a N i I -< i X I c 1 I ft - 1 50 l o s 1 O ! - cs 8 X 2 i8 * o c 1 ? n I pi iSfR | s CO 8 iI s 8S |i vl 8 1is s 8 S 1 o O' Si S = c* tft 8 saK> CD to JO sM 8o> to *0 o> to w < Ot a (O a O <n 0D KJ k 40 io to 0 80> 8 8 8 iS 5t 2 BRB 0697 000-0069