226-22 - Attachment - 25 Lakeside Avenue New Areas of Concern and CME Proposal.pdf

ASSOCIATES Mr. Leonard R. Lepore, PE August 26, 2022 Municipal Engineer/Director of Public Works Page 5 of 10 Re: Department of Public Works at 25 Lakeside Avenue — Site Investigation The samples will be collected and equipment will be decontaminated in accordance with the NJDEP Field Sampling Procedures Manual (August 2005 edition, revised April 2011). All samples will be submitted to a NELAP-accredited and NJDEP-certified laboratory for analysis on a standard turnaround time. Upon receipt of laboratory test results, CME will compare all groundwater sample results against the current NJDEP Groundwater Quality Standards (GWQS) for Class I-A Aquifers (N.J.A.C. 7:9C) and the NJDEP Vapor Intrusion Screening Levels (VISL). All the field work implemented at the Site during the site investigation will be supervised; field screening techniques will be performed in accordance with the NJDEP Technical Requirements for Site Remediation (N.J.A.C. 7:26E) to determine the potential presence of impacted materials. TASK 3: DYE TRACING TRENCH DRAIN AT INTERIOR OF STORAGE GARAGE AND REPAIR GARAGE CME will conduct Dye Tracing investigation at precast trench drains at the interior of Repair Garage and Storage Garage to evaluate if any contaminants were discharged to the environment related to the trenches. Prior to conducting a subsurface investigation at the site, CME will retain the services of an underground utility locating firm to verify the locations of utility lines within the proposed area of investigation. A 300-foot precast trench drain was identified during the Site reconnaissance and on Construction Plans for the DPW facility dated July 1981. The plans depict connection to the oil/water separators (OWS, AOC-10) and grit boxes at the exterior south and north sides of the structure and to the Site storm sewer system (AOC-8) for final discharge to Wigwam Brook (AOC-9). A 98-foot precast trench drain was identified on Construction Plans for the DPW facility dated July 1981. The plans depict connection to the Oil Water Separator (AOC-10) and grit boxes at the exterior south and north sides of the structure. The plans depict connection of the OWS system to the Site storm sewer system (AOC-8) for final discharge to Wigwam Brook (AOC9) at the southeast portion of the Site. Additional investigation (dye tracing) will be completed at AOC-7A and AOC-7B to

o the Site storm sewer system (AOC-8) for final discharge to Wigwam Brook (AOC9) at the southeast portion of the Site. Additional investigation (dye tracing) will be completed at AOC-7A and AOC-7B to determine the routing of the trench drain and to determine if the trench drain had contributed to subsurface soil impacts.