52-22 Agreement for Environmental Services Remedial Investigation Activities and Reporting.pdf

MATRIXNEWORLD Engineering Progress QA/QC purposes, one field blank per field day, and one trip blank per mobilization will also be collected. Alll samples will be analyzed by a New Jersey certified laboratory on a standard turnaround time basis. Projected costs include up to three two-day mobilizations for soil investigations. Interior Soil Sampling Interior soil samples will be collected to assess the potential impacts from any interior AOCs including AOC-1A and AOC-1B — Former ASTs, AOC-2A, AOC-2B, AOC-2C, AOC-2D, and AOC-2E —Former USTs, AOC-4 — Chemical Storage, AOC-15A — Former Scale, AOC-15B — Solvent Storage, AOC-15D — Former Machine Area, AOC-15E — Komori Press, AOC-24 ~ Hazardous Material Storage and Handling Area, and AOC-25 — Chemical Storage Cabinets. Up to sixteen interior soil samples will be collected from beneath the building slab and analyzed for Extractable Petroleum Hydrocarbons (EPH) Category 2 and Target Compound List Volatile Organic Compounds plus a Forward Library Search and Target Analyte List plus a Forward Library Search (TCL/TAL+30). Alll interior soil samples will be biased to any evidence of staining on the concrete, floor drains, sanitary sewer, or interior AOCs. All samples will be analyzed by a New Jersey certified laboratory on a standard turnaround time basis. Projected costs include one two-day mobilization for interior soil investigations. Groundwater Investigation Based on the groundwater sampling activities to date, chlorinated VOCs (CVOCs specifically Trichloroethene [TCE]), Polycyclic Aromatic Hydrocarbons (PAHs) and metals were identified at concentrations above the NJDEP’s Groundwater Quality Standards (GWQS). TCE has also been identified in soils across the Site above the NJDEP Soil Remediation Standard for the Migration to Groundwater Exposure Pathway (MGW). Importantly, the current placement of monitoring wells does not sufficiently monitor groundwater impacts from several of the undelineated AOCs. Finally, the September 2009 Site Investigation & Remedial Investigation Report, prepared by ECI, completed deeper temporary well points adjacent to the shallow monitoring wells which identified concentrations of TCE higher than the adjacent monitoring well indicating a potential diving plume. The horizontal extent and the vertical extent of the groundwater plume is unknown; therefore, as part of the RI it is

TCE higher than the adjacent monitoring well indicating a potential diving plume. The horizontal extent and the vertical extent of the groundwater plume is unknown; therefore, as part of the RI it is anticipated that additional groundwater monitoring wells will be installed, and additional groundwater samples will be collected to further define the horizontal and vertical extent of ground water contamination This task anticipates the installation of up to three shallow overburden monitoring wells and up to five deep overburden monitoring wells. Following the monitoring well installation, these monitoring wells will be subsequently developed using a submersible pump and surveyed by a New Jersey licensed surveyor. Alll monitoring wells will be gauged, and up to three additional rounds of groundwater sampling will be completed. The groundwater samples will be collected from the monitoring wells (up to 13 wells per sampling event) via low flow sampling technique. The groundwater samples will be analyzed for TCL VOC+15. In additional, PAHs and Metals will be collected from one of the rounds of groundwater samples from the monitoring wells. Water quality indicator parameters (dissolved oxygen, pH, temperature, conductivity, and ORP) will be monitored during the groundwater purging and sampling activities. For QA/QC purposes, one field blank, and one trip blank will also be collected. All groundwater samples will be analyzed on a standard turnaround time basis by a New Jersey certified laboratory. Following the conclusion of the installation of the additional monitoring wells, Matrix will arrange for the disposal of the non-hazardous investigative derived waste (IDW), up to 32 55-gallon drums. The IDW will consist of soil cuttings and monitoring well purge water generated during well development and groundwater sampling activities. In addition, Matrix will oversee the repair of up to three monitoring wells. During the December 2021 site inspection, one monitoring well (MW-4) was observed to be damaged (manhole cover damage/missing). During the new monitoring well installation, the NJDEP licensed well driller will repair and/or replace the damaged manhole covers of the monitoring well. Following the completion of the monitoring well repair, the monitoring wells will be surveyed by a licensed surveyor as noted above. F2021121-1041 - Township of West Orange Phase

the monitoring well. Following the completion of the monitoring well repair, the monitoring wells will be surveyed by a licensed surveyor as noted above. F2021121-1041 - Township of West Orange Phase | ESAs Downtown CorridonProposal\Remedial Investigation - 56 Lakeside\RI Proposal_55 Lakeside Avenue-FINAL_REV.doox 3