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 7 of 10 Re: Department of Public Works at 25 Lakeside Avenue — Site Investigation inch. This will facilitate a good seal between the inert tubing that will be wrapped with a Teflon tape and the temporary sample point. B. Connect the sub-slab soil gas sampling points to a “T” fitting. The “T” fitting will be equipped with valves to enable separate soil gas flow paths. A pump will be connected to one end of the “T” fitting and the other end will be connected to an evacuated stainless-steel canister, utilizing inert tubing. C. Purge the sample train. A volume of air that is equal to 3 times the volume of the inert tubing will be drawn using a pump. The rate at which the sample train is purged will be monitored to ensure it does not exceed 200 mL/min. D. Collect the soil gas samples utilizing laboratory certified 6-liter stainless steel canisters equipped with pre-set regulators. The regulators will be configured to sample at a draw rate of 200 mL/min (30 minutes sampling time). E. Perform laboratory chemical analysis for VOCs in accordance with the requirements of USEPA Method Low-Level (LL) TO-15 at the NJDEP certified laboratory. Standard chain-of- custody procedures will be implemented to track the sample. F. Perform field quality control procedures by utilizing tracers (e.g., iso-propanol, helium, butane, sulfur hexafluoride, or difluoroethane) to monitor for potential leaks in the sampling train. G. Restore the site to the original condition by patching the hole with cement. 3- Background Contamination Investigation CME will assess the impacts of background contaminant sources to the indoor air quality. Specifically, our scope of services will be to: A. Collect one ambient (outdoor) air sample utilizing a six-liter stainless steel canister equipped with a programmed regulator suitable for sample collection over a time period of 24 hours. This sample will be collected to evaluate the influence of outside air on the indoor air quality. B. Perform laboratory chemical analysis for VOCs in accordance with the requirements of USEPA Method Low-Level (LL) TO-15 at a NJDEP certified laboratory. Standard chain-of- custody procedures will be implemented to track the sample.