Addendum to the Phase 1 Remedial Investigation Work Plan, W
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Supufuad Ccn'.cr Slit: V bkiiAK: _ U'lHhk: ADDENDUM TO THE PHASE I REMEDIAL INVESTIGATION WORK PLAN W.R. GRACE SUPERFUND SITE ACTON, MASSACHUSETTS HSI January 14,2000 GEOTRANS A TETRA TECH COMPANY 6 Lancaster County Road, Suite Four Harvard, Massachusetts 01451 6 Lancaster County Road HSI Harvard, Massachusetts GEOTRANS 01451 A TETRA TECH COMPANY 978-772-7557 FAX 978-772-61 83 P.N. N099-007 January 13,2000 Mr. Derrick Golden Mr. Donald Hanson U.S. Environmental Protection Agency Bureau of Waste Prevention Region I MA Department of Environmental 90 Canal Street, Mail Code #HBO Protection Boston, MA 02203-0001 627 Main Street Worcester, MA 01608 Subject: Addendum to the Phase 1 Remedial Investigation Work Plan, W. R. Grace Superfund Site, Acton, Massachusetts Gentlemen: Enclosed please find the Addendum to the Phase 1 Remedial Investigation Work Plan. As indicated in the attached schedule, we will anticipate receiving comments from you on this document by March 14, 2000. If you have any questions regarding this document, please call me at (978) 772-7557. Sincerely, Anne E. Benjamin Project Manager Enclosures AEB/blc M \WP DOCS\N099\200OTI 11) 1015 »pd Derrick Golden and Donald Hanson 2 January 13,2000 cc: Seth Jaffe, Esq.. Foley. Hoag & Eliot Andy Cohen, DEP Boston Jim Demming, Action Water District Bob Eisengrein, ACES Doug Halley, Town of Acton Stephen Anderson, Anderson and Kreiger Maryellen Johns, W.R. Grace & Co. - Conn. Gretchen Muench, Esq. U.S. EPA Chuck Myette, EMCON Jim Okun, OT&O Barbara Weir, Metcalfe & Eddy J. Swallow, Pine & Swallow Associates Mitch Obradovic, W. R. Grace & Co. - Conn. Acton Public Library Nancy Bettinger, DEP Office of Research and Standards M »WP DOCS,N099\2000\Ol 13 1015 wpd HSI GEOTRANS 13 CD 1 s a- CD I 22 u. ' CN ID O a> <D ^= f •<r £ 0. £ o <o I o CD I I 9> u 1 i 0. Sra 1 j» I 0a). CgD i t> I 9> O I ra CO CO ro I UJ O 2 6 £ co <o o u_ <M i Q. 0) a. c. a> Q. 13 a 1 1 Q. CL O. a. < Q. a. ra o a. ro ra C3 OT O c 13 UJ o 1 « ra ra T3 ra ra UJ o 13 13 •o o o o co (C to UJ O CO LL. .2 E jQ UJ UJ z 3 a. » UJ £1 ra CO c 0) _ro Q UJ a. a. I UJ u> o O Qi O CD a: C/5 ce •c ou. o UJ I 1 Q. UJ (N a 01 UJ ro u c CO CD O a CO UJ ra ce Z So. £ 6 I P * 15 S CD co cc o 175 o 15 O tf i- ra CL a. S Lit .c O . CNJ CM a. 01 W (/) (A ra ra jrai -O K Q. CL a. 8. S O CM CM O O § CM CM O o I s O Ul "Is CM 41 in" a >, 3 O! f § § i u o .11" « s C/l CO CO tr Ct ce § (O UJ < Q (O UJ m UJ Ij UJ Q (O U. UJ ce.UJ UJ OQ UJ 0. O o: o LL UJ l O De UJ o U) a UJ a. o P G cc ADDENDUM TO THE PHASE I REMEDIAL INVESTIGATION WORK PLAN W.R. GRACE SUPERFUND SITE ACTON, MASSACHUSETTS PREPARED FOR: W.R. GRACE & Co. - CONN. 62 WHITTEMORE AVENUE CAMBRIDGE, MA 02140 PREPARED BY: HSI GEOTRANS, INC. 6 LANCASTER COUNTY ROAD HARVARD, MASSACHUSETTS 01451 HSI GEOTRANS PROJECT No. N099-007 JANUARY 14,2000 HSI GeoTrans, inc. TABLE OF CONTENTS PAGE 1 BACKGROUND 1-1 1.1 INTRODUCTION 1-1 1.2 NORTHEAST AREA 1-2 1.2.1 AIRCO INDUSTRIAL - ACTON, MA 1-2 1.2.2 PUBLIC WATER SUPPLY WELLS 1-2 1.3 HYDROGEOLOGIC SETTING 1-4 1.3.1 REGIONAL SETTING 1-4 1.3.2 SITE HYDROGEOLOGY 1-5 1.3.2.1 GEOLOGY 1-5 1.3.2.2 GROUNDWATER FLOW 1-6 1.3.2.3 HYDRAULIC PROPERTIES 1-7 1-7 1.3.2.4 FORT POND BROOK 1-8 1.4 GROUNDWATER QUALITY 1-8 1.5 FORT POND BROOK WATER QUALITY 1-11 1.6 SUMMARY 1-11 2 SITE CHARACTERIZATION 2-1 2.1 SITE SURVEY 2-1 2.2 SUBSURFACE AND HYDROGEOLOGIC INVESTIGATIONS 2-1 2.2.1 MONITORING WELL INSTALLATION 2-3 2.2.2 MISCELLANEOUS ACTIVITIES 2-5 2.3 SURFACE WATER AND SEDIMENTS 2-6 2.4 LONG-TERM MONITORING 2-6 2.5 TREATABILITY AND PILOT STUDIES 2-6 3 REFERENCES 3-1 APPENDIX A WATER QUALITY SUMMARY TABLES APPENDIX B ADDITIONS TO PROJECT OPERATIONS PLAN FOR W R GRACE & Co - CONN. _ M\WP_DOCS,NCK»\2000\I20I0820*TO 11 HSI OGO I TSHS, IDC. LIST OF TABLES PAGE TABLE 1-1. SUMMARY OF COMPOUNDS DETECTED PRIOR TO 1999 NORTHEAST OF THE GRACE PROPERTY (MW AND PS SERIES WELLS, CHRISTOFFERSON. LAWSBROOK AND SCRIBNER WELLS) 1-13 TABLE 1 -2. SUMMARY OF COMPOUNDS DETECTED IN 1999 NORTHEAST OF THE GRACE PROPERTY (MW SERIES WELLS, CHRISTOFFERSON, LAWSBROOK AND SCRIBNER WELLS) 1-15 TABLE A-1. SUMMARY OF COMPOUNDS DETECTED PRIOR TO 1999 NORTHEAST OF THE GRACE PROPERTY (MW AND PS SERIES WELLS, CHRISTOFFERSON, LAWSBROOK AND SCRIBNER WELLS) (SORTED BY LOCATION) APP-A-1 TABLE A-2. SUMMARY OF COMPOUNDS DETECTED PRIOR TO 1999 NORTHEAST OF THE GRACE PROPERTY (MW AND PS SERIES WELLS, CHRISTOFFERSON, LAWSBROOK AND SCRIBNER WELLS) (SORTED BY COMPOUND) APP-A-7 TABLE A-3. SUMMARY OF COMPOUNDS DETECTED PRIOR TO 1999 NORTHEAST OF THE GRACE PROPERTY (MW SERIES WELLS, CHRISTOFFERSON, LAWSBROOK AND SCRIBNER WELLS)(SORTED BY LOCATION) APP-A-12 TABLE A-4. SUMMARY OF COMPOUNDS DETECTED PRIOR TO 1999 NORTHEAST OF THE GRACE PROPERTY (MW SERIES WELLS, CHRISTOFFERSON, LAWSBROOK AND SCRIBNER WELLS)(SORTED BY COMPOUND) ... APP-A-13 TABLE B-l. PROPERTIES FOR WHICH ACCESS MAY BE REQUIRED APP-B-2 TABLE B-2. SITE-WIDE WATER LEVEL MONITORING LOCATIONS APP-B-3 TABLE B-3. GROUND WATER SAMPLING LOCATIONS AND ANALYSES APP-B-4 TABLE B-4. PROPOSED ADDITIONAL MONITORING WELL LOCATIONS APP-B-6 TABLE B-5. SOIL SAMPLING LOCATIONS FOR TOC ANALYSIS APP-B-7 FOR W.R. GRACE & Co. - CONN. M \WP DOCS\NOW2000\ 12010820 WPD 111 HSI GeoTrans, inc. LIST OF FIGURES PAGE FIGURE 1-1. SITE AND SURROUNDING AREAS 1-17 FIGURE 1 -2. UNCONSOLIDATED DEPOSITS POTENTIOMETRIC CONTOUR MAP 1999 ... 1-18 FIGURE 1-3. BEDROCK POTENTIOMETRIC CONTOUR MAP 1999 1-19 FIGURE 1 -4. AVERAGE VDC, VINYL CHLORIDE AND BENZENE CONCENTRATIONS IN UNCONSOLIDATED DEPOSITS 1986 & 1990 1-20 FIGURE 1 -5. AVERAGE VDC, VINYL CHLORIDE AND BENZENE CONCENTRATIONS IN BEDROCK 1986 & 1990 1-21 FIGURE 1-6. CROSS SECTION A-A' (DATA FROM 1986 & 1990) 1-22 FIGURE 1 -7. VDC, VINYL CHLORIDE AND BENZENE CONCENTRATIONSIN UNCONSOLIDATED DEPOSITS 1999 1-23 FIGURE 1 -8. VDC, VINYL CHLORIDE AND BENZENE CONCENTRATIONS IN BEDROCK 1999 1-24 FIGURE 1-9. CROSS SECTION A-A' (DATA FROM 1999) 1-25 FIGURE 2-1. PROPOSED EXTENSION OF THE TOPOGRAPHIC MAP 2-7 FIGURE 2-2. SCHEMATIC OF 1999 VDC CONCENTRATIONS IN GROUNDWATER 2-8 FIGURE 2-3. SITE MAP WITH PROPOSED SAMPLING LOCATIONS 2-9 FIGURE B-1. PROPERTIES FOR WHICH ACCESS MAY BE REQUIRED APP-B-8 FOR W.R. GRACE & Co. - CONN. M\WP DOCS\N099\2000M 2010820 WPD IV HSI GeoTrans, inc. LIST OF ACRONYMS AND ABBREVIATIONS Addendum Addendum to the Phase 1 Remedial Investigation Work Plan cfs cubic feet per second gpm gallons per minute Grace W. R. Grace & Co. - Conn. ISCR Initial Site Characterization Report, Operable Unit Three NGVD National Geodetic Vertical Datum of 1929 MADEP Massachusetts Department of Environmental Protection PCE Tetrachloroethene POP Project Operations Plan RI/FS Remedial Investigation/Feasibility Study RI Work Plan Phase 1 Remedial Investigation Work Plan Site W. R. Grace & Co. - Conn. Acton Superfund Site SOW Statement of Work TCA 1,1,1 -trichloroethane TCE Trichloroethene TOC Total Organic Carbon USGS United States Geological Survey VDC 1,1 ,-dichloroethene Zone 2 MADEP Approved Wellhead Protection Area FOR W.R. GRACE & Co. - CONN. M\WP DOCS\N099\2000\I2010820 WPD HSI GeoTrans, inc. 1 BACKGROUND 1.1 INTRODUCTION The Addendum to the Phase 1 Remedial Investigation Work Plan (the Addendum) for the W. R. Grace & Co. - Conn. (Grace) Acton Superfund Site (the Site) is submitted to address the area northeast of the Grace property. One of the tasks proposed in the Phase 1 Remedial Investigation Work Plan (RI Work Plan) (HSI GeoTrans, 1999a) was to obtain and review available water level and water quality data from the Airco Industrial site located northeast of the Grace property (Figure 1-1). Grace completed this task while the government parties were reviewing the RI Work Plan. The results of the data review indicate that additional data should be collected during the RI to better understand the groundwater flow direction and the nature and extent of groundwater contamination in the area northeast of the Grace property. Grace is submitting this Addendum so that uncertainties regarding groundwater contamination northeast of the Grace property can be addressed during the Phase 1 RI, rather than during a subsequent investigation. The objectives of the Addendum are to • review existing data in the area of the Airco Industrial site, review existing data in the area of the Lawsbrook, Scribner and Christofferson public water supply wells located northeast of the Airco Industrial site (Figure 1-D, • identify uncertainties regarding the flow of groundwater and the distribution of groundwater contamination in the area northeast of the Grace property, and • propose specific investigations designed to address the identified uncertainties.