NYC-WTC_000204859

NYC 9/11 Public Portal Document

OCT-31-20ai 16:45 718 732 452 6464 718 732 452 6464 P.32/35

October 30.2001 (9:48ami Final Preliminary Data New_Y2rk£|tyLSoridTVade£cnterSam£ling^A£tivities Exchange Place PATH Dewatering 2 fl0/10/01 Sample!

Preliminary Results Summary:

Dioxins and Furans: One dioxin and one fiiran were detected at very low concentrations. The total TEQ for the sample was 0.1 pico grams per liter (pg/L), which is less than the median TEQs determined in NY Harbor during CARP sampling.

(Previously Reported 10/29/01) Asbestos: Asbestos was reported as less than 39.17 million fibers per liter (MFL) greater than 10 microns in length. The federal drinking water MCL, the only federal standard for asbestos in water, is 7 MFL.

(Preyiiously Reported 10/18/01) Biochemical Oxygen Demand (BODS): The 5 day BOD was reported as 160 mg/L. This is more than double the 69 mg/L BODS detected in the 10/03/01 sample collected at the same location. The value reported is less than the 09/15-16/01 Newtown Creek STP influent of 210 mg/L, and about four (4) times greater than the Newtown Creek STP effluent of 38 mg/L.

(Previously Reported 10/15/01) Toxicity: Toxicity was measured in water samples, and samples of solids clarified firom the sample and added to seawater. The response can be characterized low-level toxicity. Following 48 hours of testing, the median lethal concentration (LC50) predicted was 83.5 percent tunnel water. Survival in the undiluted and untreated tunnel water was 32.5 percent. Survival was 975 percent or higher in all of the dilutions of the effluent (50, 25,12.5, and 6.25 percent tunnel water). Toxicity was reduced in the tunnel water that was centrifuged. Survival in this sample was 82.5 percent. However, toxicity was not reintroduced with the solids from the centrifuged sample placed in clean seawater. Survival in this treatment was 97.5 percent The dilution capacity of the receiving stream and any chemical measurements should be taken into account when evaluating management actions.

(Previously Reported 10/13/01) Available results are similar to the sample collected on 10/03/01. No PCBs were detected. Several VOCs were detected including MTBE, but all concentrations of detected VOCs were less than 100 ug/L. Fourteen NVOAs were detected, primarily phenol and substituted phenols and benzoic acid. Detected PAHs were all at trace concentrations (<10ug/L), Phenol is the only non-PAH NVOA with marine FWQC. The detected concentration is less than the acute marine criteria; chronic criteria does not exist for phenol. Zinc was detected at more than double the marine acute and chronic FWQC. Sulfate and chloride were elevated, but TSS was significantly less than that detected in the 10/03/01 sample. Oil and Grease and TPH were detected a low concentrations.

EPA Personnel; Robert Morrell Richard Coleates

CITY_21MC100_006753040

NYC-WTC_000204859