TETRA TECH, INC.

R7 START V: PCE PLAZA FORD IDEAL CLEANERS REMOVAL SITE EVALUATION SUPPORT P00005 CLOSEOUT AND DE-OBLIGATION EXCESS FUNDS

R7 START V: FINDETT CO. SITE REMOVAL TECHNICAL SUPPORT MOD P00014: CLOSEOUT AND DE-OBLIGATION

R7 START V: SIOUXLAND SUB-AREA TECHNICAL SUPPORT MOD P00004: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE EXCESS FUNDS AND CLOSE THIS TASK ORDER IN ITS ENTIRETY.

R7 START V: GENERAL MOTORS SIOUX CITY TECHNICAL SUPPORT FOR OPERATION AND MAINTENANCE OF THE GROUNDWATER EXTRACTION AND TREATMENT SYSTEM. MOD P00005 CLOSEOUT AND DE-OBLIGATION

R7 START V: GREAT RIVERS SUB-AREA TECHNICAL SUPPORT MOD P00004: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE EXCESS FUNDS AND CLOSE THIS TASK ORDER IN ITS ENTIRETY.

R7 START: OMAHA/COUNCIL BLUFFS SUB-AREA. P00003: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE EXCESS FUNDS AND CLOSE THIS TASK ORDER IN ITS ENTIRETY.

R7 START V: CHEROKEE ZINC WEIR SMELTER OU2 RI/FS SUPPORT MODIFICATION P00001: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE EXCESS FUNDS AND TO CLOSEOUT THIS TASK ORDER IN ITS ENTIRETY.

R7 START V: WASHINGTON COUNTY LEAD DISTRICT, OLD MINES, POTOSI RICHWOODS AND FURNACE CREEK OU2 SITES MOD P00009: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE EXCESS FUNDS AND CLOSE THIS TASK ORDER IN ITS ENTIRETY.

R7 START V: CENTRAL KANSAS WETLANDS SUB-AREA TECHNICAL SUPPORT MOD P00005: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE EXCESS FUNDS AND CLOSE THIS TASK ORDER IN ITS ENTIRETY.

R7 START: ST. LOUIS SUB-AREA TECHNICAL SUPPORT MOD P00004: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE EXCESS FUNDS AND CLOSE THIS TASK ORDER IN ITS ENTIRETY.

R7 START: SOUTH CENTRAL NEBRASKA SUB-AREA. P00005: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE EXCESS FUNDS AND CLOSE THIS TASK ORDER IN ITS ENTIRETY.

R7 START: ANALYTICAL SERVICES TECHNICAL SUPPORT MOD P00002: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE EXCESS FUNDS AND CLOSE THIS TASK ORDER IN ITS ENTIRETY.

R7 START V: CHEROKEE COUNTY OU3 REMOVAL ACTION SUPPORT P00003: DEOBLIGATE AND CLOSE OUT TASK ORDER.

R7 START V: HERITAGE DISPOSAL AND STORAGE EE/CA ASSESSMENT P00002: DEOBLIGATE EXCESS FUNDS AND CLOSEOUT TASK ORDER.

R7 START V: HOUSTON WOOD TREATMENT REMOVAL ACTION MOD P00003: DEOBLIGATE EXCESS FUNDS AND CLOSE OUT TASK ORDER

R7 START V: OMAHA LEAD OU2 RV03 MODIFICATION P00002 DEOBLIGATE EXCESS FUNDS AND CLOSE TASK ORDER

R7 START V: HERITAGE DISPOSAL AND STORAGE TECHNICAL SUPPORT FOR TIME-CRITICAL REMOVAL ACTION MODIFICATION P00003: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE EXCESS FUNDS AND TO CLOSEOUT THIS TASK ORDER IN IT'S ENTIRETY.

R7 START V: MISSOURI WOOD TREAT RV02 REMOVAL ACTION MODIFICATION P00002: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE EXCESS FUNDS AND TO CLOSEOUT THIS TASK ORDER IN ITS ENTIRETY.

R7 START V: HPI CHEMICAL PRODUCTS REMOVAL ACTIVITY TECHNICAL SUPPORT SSID#: B7P8 MODIFICATION P00005: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE EXCESS FUNDS AND TO CLOSEOUT THIS TASK ORDER IN IT'S ENTIRETY.

R7 START V: BIG RIVER MINE TAILINGS OU01, LEAD SILVER SPRINGS ROAD RA SUPPORT MOD P00001 - DEOB AND CLOSE OUT TASK ORDER

R7 START V - SIKESTON WELL # 8 HRS DOCUMENTATION PACKAGE MOD P00004: DEOBLIGATE AND CLOSE OUT TASK ORDER

R7 START V: PCE WEST AVENUE SITE INSPECTION MOD P00002: DE-OBLIGATE THE EXCESS FUNDS.

R7 START V: CRITICAL MINERAL RECOVERY (CMR) BATTERY FIRE SUPPORT MOD:P00002 DE-OBLIGATE THE EXCESS FUNDS IN THE AMOUNT OF $190,477.53.

R7 START V: TOASTMASTER CLARENCE REMOVAL SITE ASSESSMENT TECHNICAL SUPPORT MOD P00005: DEOBLITGATE EXCESS FUNDS AND CLOSE TASK ORDER

R7 START V: GM SIOUX CITY HRS MOD P00003: DE-OBLIGATE THE EXCESS FUNDS.

R7 START V: MISSOURI WOOD TREATING REMOVAL ACTION P00002: DE-OBLIGATE THE EXCESS FUNDS.

R7 START V: TOASTMASTER MOBERLY PRELIMINARY ASSESSMENT AND REMOVAL SITE EVALUATION TECHNICAL SUPPORT MODIFICATION P00005: THE PURPOSE OF THE MODIFICATION IS TO DE-OBLIGATE EXCESS FUNDS AND TO CLOSEOUT THIS TASK ORDER.

R7 START VI: PRELIMINARY ASSESSMENTS OF FORMER MARTINIZING DRY CLEANING PLANT MOD P00001 - ADDITIONAL LOE DUE TO ADDITIONAL SAMPLING ASSOCIATED WITH NEWLY IDENTIFIED GROUNDWATER/SOIL-GAS LOCATIONS.

R7 START VI: FORMER UNITED ZINC AND ASSOCIATED SMELTERS DATA SUPPORT, FIELD SAMPLING, AND TECHNICAL SUPPORT FOR REMEDIAL ACTIVITIES.

R7 START V: MADISON COUNTY MINES OU3 REMOVAL SUPPORT P00002: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE THE REMAINING FUNDS IN THE AMOUNT OF $1,897.89 AND CLOSE OUT THIS TASK ORDER.

R7 START V: BIPARTISAN INFRASTRUCTURE LAW (BIL) SITES DATA MANAGEMENT TECHNICAL SUPPORT P00001: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE THE REMAINING FUNDS IN THE AMOUNT OF $6,668.47 AND CLOSE OUT THIS TASK ORDER.

R7 START V: DOWNTOWN WELLS WHITE CLEANERS RA SUPPORT P00001: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE THE REMAINING FUNDS IN THE AMOUNT OF $8,490.99 AND CLOSE OUT THIS TASK ORDER.

R7 START V: PCE SOUTHEAST CONTAMINATION REMOVAL ACTION TECHNICAL SUPPORT P00001: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE THE REMAINING FUNDS IN THE AMOUNT OF $72,985.02 AND CLOSE OUT THIS TASK ORDER.

R7 START V:MERCURY - PERCIVAL REMOVAL ACTION SUPPORT P00002: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE THE REMAINING FUNDS IN THE AMOUNT OF $1,897.89 AND CLOSE OUT THIS TASK ORDER.

R7 START: ORONOGO-DUENWEG MINING BELT (ODMB) REMEDIAL AND REMOVAL SITE SUPPORT P00002: THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE THE REMAINING FUNDS IN THE AMOUNT OF $109.15 AND CLOSE OUT THIS TASK ORDER.

R7 START VI: PRELIMINARY ASSESSMENTS OF FORMER MARTINIZING DRY CLEANING PLANT

R7 START VI: REMOVAL SUPPORT FOR MERCURY-EARNSHAW STREET

R7 START VI: CONTRACT MANAGEMENT TO OVERALL START VI CONTRACT

R7 START VI: EXPANDED SITE INVESTIGATION RUTH NORGE LANDERAMA

AE SERVICES FOR REMEDIAL INVESTIGATION (RI) AND FEASIBILITY STUDY (FS) AT THE HISTORIC POTTERIES SUPERFUND SITE (SITE) OPERABLE UNIT 2 (OU2)

R7 START VI: HRS SUPPORT GENERAL MOTORS SIOUX CITY

R7 START VI:RA TECHNICAL SUPPORT, WASHINGTON COUNTY LEAD DISTRICTS - FURNACE CREEK & OLD MINES (OPTION) POTOSI

R7 START VI: COMMUNITY ENGAGEMENT SUPPORT

R7 START VI: PLANNING AND PREPAREDNESS/REGIONAL RESPONSE TEAM ACTIVITIES

R7 START VI: VIBURNUM TREND LEAD HAUL ROADS

R7 START VI: REMEDIATION ACTION BIG RIVER MINE TAILINGS

R7 START VI: SAMPLING AND ANALYSIS SUPPORT CHEROKEE COUNTY

R7 START VI: SUPPORT & MANAGEMENT GREATER ST. LOUIS SUBAREA SUPPORT

R7 START VI: SUPPORT & MANAGEMENT NEBRASKA SUBAREA SUPPORT

R7 START VI: SUPPORT & MANAGEMENT KANSAS CITY WAREHOUSE