Path: Y:\Figures\General\ERC_Plumemap\GIS\20140408\GIS\Arcmap\erc_plumemap_20140410.mxd Date: 6/12/2014 Time: 9:08:37 AM User: 1272479611E Legend Cape Cod Bay R ou te Chlorinated Solvents Plume - 6 Concentrations Exceed MCLs TCE = 5.0 µg/L PCE = 5.0 µg/L EDB Plume - Concentrations Exceed MMCL = 0.02 µg/L Perchlorate Plume - Concentrations Exceed MMCL = 2.0 µg/L -6 RDX Plume - Concentrations exceed EPA 10 risk-based level = 0.6 ppb Fuel Plume - The Following Contaminants Exceed Associated R o MCP GW1 or RBC Groundwater Standards: u t C5-C8 aliphatic hydrocarbons, GW-1 = 300 µg/L e 1 *#*# C9-C10 aromatic hydrocarbons, GW-1 = 200 µg/L 3 Demolition Area 2 0 C9-C12 aliphatic hydrocarbons, GW-1 = 700 µg/L anal *# od C Northwest C11-C22 aromatic hydrocarbons, GW-1 = 200 µgp/Le C 1,2,4-TMB, RBC = 19 µg/L Ca Corner 1,3,5-TMB, RBC = 19 μg/L 2-methylnaphthalene, GW-1 = 10 µg/L d d R R ne *# w oy e d Plumes with Remedy in Place i rg Gi u b V B b R s l l R *# w a a d o l n n r a a a Plumes with Interim Remedy in Place a B B C C Extraction Well Central Impact Area !D Extraction Well (Off) O "S Reinjection Well Scale: 1 inch = 1 mile Je Sandwich ! ffe !D Reinjection Well (Off) 0 0.5 1 "S rs on R Outflow Bubbler d # Miles "S * "S Treatment Facility Phinney's HarboTrhe areas of contamination show the combined contaminants "S # Municipal Water Supply Well * of concern within each plume. d R W WS-4 oo y Town Boundary d R a # CS-19 d "S w n Infiltration Trench/Gallery e "S e Western r Treatment System Pipeline: G *# 8 J-2 2 Boundary Influent Effluent e "S t u d *# o R R "S e s *# u *# o h d d g R R Joint Base Cape Cod n *# *# ti s s e *# d e n n J-1 i i M R k k r e r r uak w Q e e e P P P k k J-3 *# n n a a 0 r r "S 3 F F Demolition Area 1 "S 1 te u Peters "S ! o !D d L Range R Pond "S R "S Pocasset e n i Several FS-12 extraction and reinjection wells Harbor t n FS-12 are turned off (not shown at this scale) e p r Bourne u Hen T Snake Cove Pond Weeks Pond Wakeby Pond Red Brook Harbor Co nne ry R d LF-1 LF-1 *# Mashpee Squeteague *# Pond Harbor *# "S CS-10 Megansett LF-1 Harbor "S !D FTA-2 "S CS-23 All SD-5 extraction wells are turned off "S !! PFSA "S FS-1 Moody CS-21 CS-10 Pond ! !D "S!D !D CS-20 CS-10 !D!D !D !D !D CS-21 CS-4 Wild Harbor !D Ashumet FS-29 CS-20 Pond # ! !D ! R !D ou !D te Johns 1 5 Pond *# !D !D 1 CS-20 Ashumet CS-10 Valley Deep Pond 8 2 e t u !D o *# Coonamessett R *# Pond "S *# !D Crooked Pond FS-2 8 Ashumet Mashpee Valley "S Falmouth FS-28 # 8 * 2 e t u o Jenkins R Pond Ashumet Valley *# !D Surface water from Long Pond is also Long used as a drinking water source for *# Pond the town of Falmouth *# *# Contaminant of Concern (COC) Type of Contaminant Risk-Based Level TCE – trichloroethene solvent MCL = 5 µg/L PCE – perchloroethene solvent MCL = 5 µg/L CCI4 – carbon tetrachloride solvent MCL = 5 µg/L EDB – ethylene dibromide fuel-related compound MMCL = 0.02 µg/L benzene fuel-related compound MCL = 5 µg/L vinyl chloride solvent MCL = 2 µg/L 1,1,2,2-tetrachloroethane solvent GW-1 = 2 µg/L 1,4-dichlorobenzene solvent MCL = 5 µg/L Joint Base Cape Cod manganese metal EPA Health Advisory = 300 µg/L thallium metal MCL = 2 µg/L lead metal 15 µg/L (treatment technique action level for water distribution systems) Groundwater Plume Map toluene fuel-related comp ound MCL = 1,000 µg/L Issued June 2014 RDX - hexahydro-1,3,5-trinitro-1,3,5-triazine explosive HA = 2 µg/L GW-1 = 1 µg/L 10 -6 = 0.6 µg/L perchlorate oxidizer HA = 15 µg/L MMCL = 2 µg/L C5-C8 aliphatic hydrocarbons fuel-rela ted compound GW-1 = 300 µg/L C9-C10 aromatic hydrocarbons fuel-related compound GW-1 = 200 µg/L C9-C12 aliphatic hydrocarbons fuel-related compound GW-1 = 700 µg/L Note: ppb = parts per billion and MCL – Maximum Contaminant Level C11-C22 aromatic hydrocarbons fuel-related compound GW-1 = 200 µg/L is a measure of concentration. MMCL – Massachusetts Maximum Contaminant Level 1,2,4-TMB fuel-related compound RBC = 19 µg/L It is approximately equivalent to HA – Federal Lifetime Health Advisory 1,3,5-TMB fuel-related compound RBC = 19 µg/L micrograms per liter (µg/L). GW-1 – State default cleanup value to be used in lieu of site-specific risk-based level 2-methylnaphthalene fuel-related compound GW-1 = 10 µg/L 10 -6 – EPA level resulting in an excess cancer risk of one in a million RBC - Site Specific Risk Based Concentration.