100-25 Exhibit B-Additional wells and sampling.pdf

March 11, 2025 Ms. Zayibeth Carballo, PE,PLS,PP,CME,CFM,CFS Director, Municipal Engineer Department of Engineering Township of West Orange 25 Lakeside Avenue, West Orange, NJ 07052 zcarballo@westorange.org Mr. James Abbott Business Administrator 66 Main Street West Orange, NJ 07052 policechief@wopd.org Re: Professional Environmental and Licensed Site Remediation Services Change Order for West Orange DPW at 25 Lakeside Avenue West Orange RES 350-23 - Purchase Order # 182229 CME Project No. IWO-00380.13 Dear Ms. Carballo: CME Associates (CME) is currently contracted with the Township for Professional Environmental and Licensed Site Remediation Services consulting work at the West Orange DPW located at 25 Lakeside Avenue (Site). Recently, a contaminated Area of Concern (AOC) was identified at the Site (Salt Dome), the most recent groundwater analytical results confirmed a discharge at the Salt Dome as an additional impacted AOC which has to be investigated and remediated in accordance with the NJDEP Regulations and Guidance. Additional remedial investigation activities should be completed to delineate the exceedances of Metals associated with the Salt Dome discharge and identify the extent of this discharge. The additional work required to investigate the new AOC is not included in the original proposal. A review of the groundwater sampling documents and results at the Site and the off-site adjacent property Former Barton Press, it appeared that historical results for metals analysis showed exceedances for sodium at some of the Former Barton Press wells, located both in the upgradient and downgradient of the AOC source area (Salt Dome). The investigation at the off-site adjacent property (Former Barton Press) is required to complete the groundwater delineation/groundwater remedial investigation at the DPW Site. The additional work required to investigate the new AOC includes installation of two additional monitoring wells and conducting groundwater sampling at selected wells at the Former Barton Press property and the DPW property for the analysis of Metals at the same time for comparison. The following scope of work is required to comply with the NJDEP Technical Requirements for Site Remediation at the Site and necessary to continue to advance the project towards closure.