Pueblo Chemical Depot Phase III RCRA Facilitv Investigation Final Report SWMU 33
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Pueblo Chemical Depot Phase III RCRA Facilitv Investigation Final Report SWMU 33 Pre0ared For Pueblo Chemical Depot UnderCentractTe U.S. Army Corps of Engineers Omaha District AugusI1999 18838-1/1-M PA14SONS PARSONS IMMIMMERING SMENCO, INC. 10003872 1700 6-roadwoy, Suits 900 - 0anver, Colorado 80290 PUEBLO CHEMICAL DEPOT PHASE III RCRA FACILITY INVESTIGATION SWMU 33 FINAL REPORT Prepared For PUEBLO CHEMICAL DEPOT Under Contract To U.S. ARMY CORPS OF ENGINEERS OMAHA DISTRICT August 1999 Prepared By Parsons Engineering Science, Inc. 1700 Broadway, Suite 900 Denver, Colorado 80290 TABLE OF CONTENTS Page EXECUTIVE SUM M ARY ...........................................................................................ES-1 LIST OF ACRONYMS, ABBREVIATIONS, AND UNITS OF MEASURE ...................v SECTION I - INTRODUCTION ....................................................................................1-1 1.1 Project Background and Authority ......................................................................1-1 1.2 Purpose and Scope ...............................................................................................1-2 1.3 Docum ent M odifications .....................................................................................1-2 1.4 Report Structure ................................................................................................... 1-3 1.5 Facility Background .............................................................................................1-4 1.5.1 Facility Description and History ..............................................................1-4 1.5.2 Environm ental Setting .............................................................................1-5 1.5.2.1 Topography .............................................................................1-5 1.5.2.2 Clim ate ....................................................................................1-5 1.5.2.3 Surface W ater Hydrology ........................................................1-5 1.5.2.4 Geology ...................................................................................1-6 1.5.2.5 Hydrogeology ..........................................................................1-7 1.5.3 Regional W ell Inventory ..........................................................................1-8 1.6 Sum m ary of Study Areas .....................................................................................1-8 SECTION 2 - INVESTIGATION SUMMARY AND PROCEDURES .........................2-1 2.1 Investigation Sum m ary ........................................................................................2-1 2. 1.1 Overview ..................................................................................................2-1 2.1.2 SW MU 33 Investigations .........................................................................2-2 2.2 Investigation Procedures ......................................................................................2-2 2.2.1 Field-Screening M ethods .........................................................................2-2 2.2.1.1 Field Photoionization Detector Headspace Screening ............2-2 2.2.1.2 Field X-Ray Fluorescence .......................................................2-2 2.2.2 Surface Soil Sam pling ..............................................................................2-3 2.2.3 Soil Borehole Drilling and Subsurface Soil Sam pling ............................2-4 2.2.4 M onitoring W ell Installation ....................................................................2-4 2.2.5 M onitoring W ell Developm ent ................................................................2-5 2.2.6 M onitoring Well Purging and Sampling ..................................................2-5 2.2.7 W ater Level M easurem ent .......................................................................2-5 2.2.8 Aquifer Testing ........................................................................................2-6 2.2.9 Equipm ent Decontam ination ...................................................................2-6 2.2.9.1 Nonsampling Equipm ent .........................................................2-6 2.2.9.2 Sam pling Equipm ent ...............................................................2-6 2.2.10 Sam ple Handling and Shipping ...............................................................2-7 2.2.10.1 Sample Identification ..............................................................2-7 2.2.10.2 Sam ple Labels .........................................................................2-8 2.2.10.3 Sample Packaging and Shipping .............................................2-9 _i_ S:\ES\WP\PROJECTS\731018\SWMU33\1.DOC TABLE OF CONTENTS (CONTINUED) Page 2.2.11 Surveying ................................................................................................. 2-9 2.2.11.1 Use of the Global Positioning System ....................................2-9 2.2.11.2 Conventional Surveying ........................................................2-10 2.2.12 Field Quality Assurance Samples ..........................................................2-10 2.2.12.1 Trip Blanks ............................................................................2-10 2.2.12.2 Ambient Blank ......................................................................2-10 2.2.12.3 Decontamination W ater Blank ..............................................2-10 2.2.12.4 Distilled W ater Blank ............................................................2-11 2.2.12.5 Equipment Rinseate Blanks ..................................................2-11 2.2.12.6 Field Duplicate Samples .......................................................2-11 2.2.13 Disposition of Investigation-Derived W astes ........................................2-11 2.3 Deviations from W ork Plan ...............................................................................2-11 SECTION 3 - INVESTIGATIVE RESULTS FOR SWMU 33 ......................................3-1 3.1 Site History .......................................................................................................... 3-1 3.1.1 FormerRifle/Pistol Range (SW M U 33) ..................................................3-1 3.1.2 Results of Phase I and II Investigations ...................................................3-1 3.2 Phase III Investigation ......................................................................................... 3-1. 3.2.1 Geologic Setting and Soil Conditions ......................................................3-1 3.2.2 Hydrogeologic Setting .............................................................................3-'? 3.2.3 Soil Investigation .....................................................................................3-3 3.2.3.1 Soil Investigation Summary ....................................................3-3 3.2.3.2 Nature and Extent of Soil Contamination ...............................3-3 3.2.4 Groundwater Investigation .......................................................................3-5 3.2.4.1 Groundwater Investigation Summary .....................................3-5 3.2.4.2 Nature and Extent of Groundwater Contamination .................3-6 3.2.5 Fate and Transport ...................................................................................3-6 3.2.6 Summary of SWMU 33 Risk Screen Results for Human and Ecological Receptors ...............................................................................3-6 Results of the Ecological Benchmark Screening Comparison .................3-6 3.2.7 Summary and Conclusions ......................................................................3-7 SECTION 4 - REFERENCES .........................................................................................4-1 -ii- S:\ES\WPTROJECTS\731018\SWMU33\1.DOC TABLE OF CONTENTS (CONTINUED) LIST OF TABLES No. Title Page Section 1 1.1 W ater W ell Survey ................................................................................................ 1-17 Section 2 2.1 Investigation Summary for SWMU 33 .................................................................2-14 2.2 D rilling Summ ary Table .......................................................................................2-15 2.3 Analyses Conducted for Groundwater Samples ...................................................2-21 2.4 Analyses Conducted for Soil Samples Collected From Soil Boreholes and Boreholes for M onitoring W ells ....................................................................2-22 2.5 Renaming of Existing Monitoring Wells ..............................................................2-23 Section 3 3.1 Summary of Laboratory Geotechnical Results .....................................................3-17 3.2 Results of Alluvial Aquifer Slug Test Analyses ...................................................3-18 3.2 Detected Analytical Results.for Organic Compounds in Soil Samples ................349 3.3 Detected Analytical Results for Inorganic Compounds in Soil Samples .............3-21 3.4 Detected Analytical Results for Nitrate/Nitrite in Soil Samples ..........................3-25 3.5 Detected Analtyical Results for Organic Compounds in Groundwater S am p les ................................................................................................................. 3-26 3.6 Summary of Field Parameters for Groundwater ...................................................3-27 -iii- SAESMPTROJECTSM 101 8\SWMU33\1.D0C TABLE OF CONTENTS (Continued) LIST OF FIGURES No. Title Page Section