22-20 Exhibit-Authorizing Matrix to Utilize Supplemental HDSRF Grant Funding to Complete the Remedial Investigation at the Selecto Flash.pdf

Supplemental HDSRF Application Page 3 of 5 i Selecto Flash, Inc.____________ efforts to use SPLP results to develop a SS-IGWSRS for TCE were unsuccessful and site specific soil characterization data will be required in order to use the SESOIL model to assess the Impact to ;• Groundwater pathway. Repairs to older wells and groundwater sampling in 2019 has provided additional information regarding the comingled plumes in the area. Based on the results of the 2019 groundwater sampling, Vapor Intrusion (VI) sampling is required at occupied structures within 100 feet of CVOC contamination above NJDEP Vapor Intrusion Groundwater Screening Levels (GWSL). Currently, Selecto Flash wells MW-1R, MW-2, and MW-3R contain exceedances of the VI GWSL for TCE or vinyl chloride. If the Selecto Flash property boundary is used to determine the 100 foot radius, there are currently three homes that are within 100 feet The Supplemental HDSRF Funds will be used to: !- • Complete additional soil sampling to determine the horizontal extent of the impacted soils at the Site; " • Complete additional soil sampling to determine site specific soil characteristics for use in the SESOIL model; • Complete an additional round of groundwater sampling, totaling three groundwater sampling rounds with the RI activities; • Complete required VI sampling at three homes (only one home was included in the original RI SOW); • Dispose of Investigation Derived Waste (IDW); and I • Prepare a Remedial Investigation Report and a Remedial Action Workplan. Soil Investigation Based on soil sampling activities at the Site to date, VOCs including CVOCs were identified at concentrations above the NJDEP RDCSRS, NRDCSRS, IGWSSL, and/or SS-IGWSRS. September 2019 soil sampling was successful in delineating much of the Site to DIGWSSL, and/or SS-IGWSRS. Additional soils sampling and analysis will allow Matrix to complete the horizontal delineation of CVOC impacted soil. Soil sampling

ng much of the Site to DIGWSSL, and/or SS-IGWSRS. Additional soils sampling and analysis will allow Matrix to complete the horizontal delineation of CVOC impacted soil. Soil sampling will also be completed for site specific soil characteristics for use in the SESOIL model. The supplemental soil investigation will include the collection of up to 8 soil samples in one mobilization of a direct push rig. Soil cores will be collected in five-foot intervals with dedicated acetate sleeves. Prior to initiating the RI activities, New Jersey One Call will be notified. Upon retrieval of soil cores, subsurface materials will be visually inspected, screened with a photo-ionization detector (PID) [MiniRae parts per billion (ppb) meter] for organic vapors and logged for material content and lithology. The soil borings will be advanced to approximately 10 to 15 feet below grade surface (ft bgs). The samples will be analyzed for Target Compound List (TCL) VOCs+15. ! i Three samples will be collected at varying depths and be submitted for sieve with hydrometer analysis. i Groundwater Investigation Based on groundwater sampling activities at the Site to date, PCE and TCE were identified at concentrations above the NJDEP GWQS. An additional round of groundwater sampling and analysis will allow for better development of the Conceptual Site Model and the position and magnitude of the subject Site groundwater plume in relation to the various comingled CVOC plumes associated with the Site and the Orange Valley Groundwater Superfund Site. This data will help determine whether what the most applicable remedial action will be for the groundwater contamination. F:\2017\17-296 Selecto Flash PA_SI\Proposa1\2020\HDSRF SelectoFlash RI RAWP SOW Rev 1 .doc