59-24 Proposal - Fire House No. 4.pdf

October 9, 2023 Mr. Leonard R. Lepore, PE, Municipal Engineer Re: Proposal for West Orange Fire House #4 Page 2 Previously, because of the limited overhead clearance in the building, the drilling/injection inside the garage (the up-gradient area of MW-4) was limited. The treatment application focused on the area down gradient of MW-4 and around MW-11 and MW-5. Therefore, excavation was recommended to remove soil from the area as practicable as possible without compromising the stability of the garage building. The scope of work for the excavation was planned to expedite remediation of groundwater at this area. During the excavation activities, an underground piping was exposed indicating that an old Fuel Pumping Island was located immediately at the front of the garage doors. This area of concern is suspected to have an old discharge impacting the groundwater at the area around MW-4R and MW-11R. Based on the recent groundwater results at MW-4R that showed a rebound in contaminant concentrations, it confirmed additional area of concern impacts. Therefore, the NJDEP Hot-Line was called to notify the department of the discharge at the Fire House #4 and a new case # 23-01-19-1312-46 was issued for the exceedances in groundwater related to gasoline discharge caused by the new discovered area of concern (old Fuel Pumping Island). This step was necessary to create a new activity at the Site other than existing case for USTs. In accordance with the NJDEP Regulations and recent guidance, additional groundwater remedial activities are required to complete the groundwater remedial investigation and remedial action at the Site. The proposed scope of work is prepared to satisfy the New Jersey Department of Environmental Protection (NJDEP) requirements stated in the Administrative Requirements for Remediation of Contaminated Sites (ARRCS Rule, N.J.A.C. 26:C) and the Technical Requirements for Site Remediation (Tech Rule, N.J.A.C. 7:26E), in accordance with New Jersey’s Site Remediation Reform Act (SRRA). Scope of Services Based on the remedial investigation findings, Site conditions and recent groundwater investigation, the extent of impacted groundwater should be and continue the semi-annual groundwater sampling. CME has prepared the following scope of work to comply with the NJDEP Technical Requirements for Site Remediation at the Site and provide the consultation and

nue the semi-annual groundwater sampling. CME has prepared the following scope of work to comply with the NJDEP Technical Requirements for Site Remediation at the Site and provide the consultation and project management necessary to continue to advance the project towards closure.