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Technical Memorandum, Royal River Discharge Zone

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Technical Memorandum, Royal River Discharge Zone RI98214D DRAFT TECHNICAL MEMORANDUM REVISION 1 REMEDIAL ALTERNATIVES SCREENING ROYAL RIVER DISCHARGE ZONE MCKIN SITE GRAY, MAINE RESPONSE ACTION CONTRACT (RAG), REGION I For U.S. Environmental Protection Agency By Tetra Tech NUS, Inc. EPA Contract No. 68-W6-0045 EPA Work Assignment No. 025-RICO-0136 TtNUS Project No. N7793 September 1998 TETRA TECH NUS, INC. RI98214D DRAFT TECHNICAL MEMORANDUM REVISION 1 REMEDIAL ALTERNATIVES SCREENING ROYAL RIVER DISCHARGE ZONE MCKIN SITE GRAY, MAINE RESPONSE ACTION CONTRACT (RAC), REGION I For U.S. Environmental Protection Agency By Tetra Tech NUS, Inc. EPA Contract No. 68-W6-0045 EPA Work Assignment No. 025-RICO-0136 TtNUS Project No. N7793 September 1998 Jarp^slForrelli, P.E. George 0. Gardner, P.E. Ppoject Manager Program Manager DRAFT TABLE OF CONTENTS DRAFT TECHNICAL MEMORANDUM - REVISION 1 REMEDIAL INVESTIGATION/FEASIBILITY STUDY MCKIN SITE GRAY, MAINE SECTION PAGE 1.0 INTRODUCTION 1-1 2.0 SITE DESCRIPTION AND HISTORY 2-1 2.1 Site Description 2-1 2.2 Site History 2-3 3.0 RRDZ FIELD INVESTIGATION 3-1 3.1 Groundwater Investigation 3-1 3.2 Ecological Assessment 3-4 3.3 Location/Topographic Survey 3-4 4.0 RRDZ CONCEPTUAL GROUNDWATER MODEL 4-1 4.1 System Boundaries 4-2 4.2 Hydrostratigraphic Units 4-2 4.3 Groundwater Flow 4-3 4.4 Aquifer Characteristics 4-3 4.5 Water Budget 4-6 4.6 TCE Flux to the Royal River 4-6 5.0 REMEDIAL ALTERNATIVES SCREENING 5-1 5.1 Screening Evaluation Criteria 5-3 5.2 Natural Attenuation 5-4 5.3 Groundwater Interception 5-7 5.4 Cover Boiling Springs/Sparge Royal River 5-1 2 5.5 Cover Boiling Springs/Groundwater Interception 5-17 6.0 ALTERNATIVE SCREENING SUMMARY 6-1 6.1 Alternative 1 - Natural Attenuation 6-1 6.2 Alternative 2 - Groundwater Interception 6-2 6.3 Alternative 3 - Cover Boiling Springs/Sparge Royal River 6-2 6.4 Alternative 4 - Cover Boiling Springs/Groundwater Interception 6-3 REFERENCES RI98214D I McKin Site, ME DRAFT TABLE OF CONTENTS (cont'd) DRAFT TECHNICAL MEMORANDUM - REVISION 1 REMEDIAL INVESTIGATION/FEASIBILITY STUDY MCKIN SITE GRAY, MAINE FIGURES NUMBER PAGE 2-1 Site Location 2-2 2-2 Royal River Discharge Zone Study Area 2-4 3-1 Field Investigation Data Locations 3-2 3-2 Wetland and Floodplain Boundaries 3-5 4-1 Potentiometric Surface of Shallow Confined Aquifer 4-4 4-2 Potentiometric Surface of Deep Confined Aquifer 4-5 5-1 Groundwater Interception Alternative Location 5-8 5-2 Groundwater Interception System Flow Diagram 5-10 5-3 Cover Boiling Springs/Sparge Royal River Alternative Location 5-15 5-4 Cover Boiling Springs/Ground water Extraction Alternative Location 5-19 APPENDICES A DIRECT PUSH TECHNOLOGY (DPT) LOGS B FIELD SCREENING GAS CHROMATOGRAPH (GO RESULTS C BOREHOLE LOGS, WELL CONSTRUCTION DIAGRAMS, AND GRAIN SIZE ANALYSIS D ANALYTICAL LABORATORY RESULTS DATABASE E DATA POINT COORDINATES AND ELEVATIONS F GROUNDWATER INVESTIGATION AND AQUIFER TEST ANALYSIS G AQUIFER TEST CALCULATIONS H TCE LOADING AND CAPTURE ZONE CALCULATIONS I POTENTIAL SITES FOR REMEDIAL FACILITIES J REMEDIAL ALTERNATIVE CALCULATIONS K DETAILED COST ESTIMATES RI98214D II McKin Site, ME DRAFT 1.0 INTRODUCTION This Draft Remedial Alternative Screening Technical Memorandum Revision 1 was prepared by Tetra Tech NUS, Inc. (TtNUS), at the request of the U.S. Environmental Protection Agency (EPA) under Contract No. 68-W6-0045. This technical memorandum describes the remedial alternative screening process used for the Royal River Discharge Zone (RRDZ) at the McKin Site, Gray, Cumberland County, Maine, under Work Assignment No. 025-RICO-0136. The remedial alternative screening was performed in accordance with the Draft Final Work Plan dated June 1998. The McKin Site is a former hazardous waste recycling facility located on Mayall Road in Gray, Maine. Soil and groundwater at the McKin Site are contaminated with solvents as a result of past petroleum and industrial chemical wastes collection, storage, disposal, and transfer practices. Remediation of the source area and groundwater adjacent to the McKin property was addressed by the McKin Site Trust based on a 1985 Record of Decision (ROD) and a 1988 Consent Decree. Contaminants released to the subsurface at the McKin property have been entrained in the groundwater flow of the underlying regional aquifer system, and have been carried to the regional aquifer discharge point at the Royal River (the RRDZ), approximately 4,000 feet east of the McKin property. Contaminated groundwater discharges at the RRDZ are concentrated within a river reach of approximately 300 to 500 feet. Trichloroethene (TCE) is the primary contaminant identified in groundwater and surface water. Near the RRDZ, TCE concentrations of approximately 1,000 /jg/L are typically detected in one monitoring well. Surface water TCE concentrations at Boiling Springs in the RRDZ have ranged from 290 to 470 fjg/L since 1995. TCE concentrations in the Royal River range from about 5 to 30 jj.g/L for 2000 feet downstream of the RRDZ depending on the water level of the river. TCE concentrations above the Maine standard of 2.7 ng/L have been detected as far downstream as the lower Yarmouth dam, 12 miles downstream. This Draft Technical Memorandum Revision 1 presents the results of the recent RRDZ field investigation and the screening of previously identified candidate remedial alternatives, RI98214D 1-1 McKin Site, ME DRAFT which were revised on the basis of the RRDZ field investigation results. The screening's purpose is to evaluate potential technologies according the screening criteria of effectiveness, implementability and cost and to evaluate which alternatives should be further evaluated in any site-wide feasibility study prepared for the McKin Site. The Feasibility Study to be prepared for the McKin Site will be prepared to meet the primary objective of developing and evaluating remedial alternatives that will provide adequate protection of human health and the environment for all areas of the site. The site-specific remedial action objective (RAO) for the RRDZ Technical Memorandum is to reduce the concentration of TCE in the Royal River to a level below the Maine Ambient Water Quality Criteria (AWQC) Human Health Criteria for water and organisms of 2.7 |^g/L. The RAO for the site does not address restoring the RRDZ aquifer. Major components of the alternatives are defined with respect to size and configuration of the representative process options; rates of flow or treatment; spatial requirements; distances for disposal; and required permits, imposed limitations, and other factors necessary to evaluate the alternatives. Two alternatives have been proposed as final candidate alternatives. RI98214D 1-2 McKin Site, ME DRAFT 2.0 SITE DESCRIPTION AND HISTORY The following section presents a brief summary of the site description and history 2.1 Site Description The McKm Superfund Site is located in Gray, Maine, approximately 15 miles north of Portland, Maine. The McKm property comprises an area of approximately 7 acres located on the west side of Mayall Road The site includes those areas presently and potentially impacted by groundwater contamination from the McKm property, and is bounded roughly as follows (see Figure 2-1): • On th esouth by Yarmouth Road from Depot Road to Mayall Road and a line from the southern terminus of Mayall Road running east to the Royal River • On th eeast by Royal River • On th enorth by Collyer Brook • On th ewest by a line from the intersection of Collyer Brook with Merrill Road and closing at the intersection of Depot Road and Yarmouth Road Based on observed contaminant distribution, the site also extends north of Collyer Brook at its confluence with the Royal River, and east just beyond the Royal River at the river bend due east of the McKm property. In total, the site consists of approximately 660 acres of commercial, residential, agricultural, and undeveloped properties The topography west of the McKm property is relatively flat. The topography of the property has been modified by past excavations, with the on-site fenced enclosure surrounded by steep upward slopes to the west, south, and north. The property is accessible from Mayall Road East of Mayall Road, the land slopes downward to the flood plain of the Royal River The land surface is dissected by a number of small, unnamed streams, and associated gullies. R198214D 2-1 McKrn Site, ME DRAFT H H H 1 V 1 1 KILOMETER T QUADRANGLE LOCATION SITE LOCATION FIGURE 2-1 REMEDIAL ALTERNATIVES SCREENING ­ TECHNICAL MEMORANDUM McKIN SITE ­ GRAY, MAINE TETRA TECH NUS, INC. DRAWN BY R G DEWSNAP REV CHECKED BY J B H OLDEN DATE AUGUST 27 1998 55 Jonspin Road Wilmington, MA 01887 SCALE APPROX 1" = 2000' NAME DWG\MCKIN\TECHMEM\LOCUS DWG (978)658-7899 2-2 McKin Site, ME RI98214D DRAFT The resulting topography is frequently very steep, and access can be difficult. The RRDZ is the area of the site where the TCE groundwater plume discharges to the Royal River, approximately 4,000 feet west of the McKin property on Mayall Road and 1,500 feet south of Depot Road (see Figure 2-2). The Royal River generally flows south through the study area. At the southern end of the RRDZ, it turns east for approximately 1,200 feet, flowing under the Maine Central Railroad bridge before turning south again. The Royal River empties into Casco Bay, in the Town of Yarmouth, Maine. The river flows a distance of 25 miles and has a total drainage area of 142 square miles. The drainage area of the Royal River upstream of the study area is approximately 70 square miles. The elevation of the Royal River in the RRDZ is approximately 200 feet lower than the McKin property.
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