NYC-WTC_000204859

NYC 9/11 Public Portal Document

OCT-31-2001 16:46 718 732 452 6464 718 732 452 6464 P.35/35

Phenol is the only detected NVOA having established marine acute FWQC. Marine chronic criteria has not been established for phenol. The concentration detected in the PATH tunnel effluent is more than 10 times less than the marine acute FWQC. Proposed acute and chronic FWQC for 2,4,5-trichlorophenol were also not exceeded in the sample.

Compound Concentration Marine Acute Marine Chronic (ug/1) FWQC (ug/1) FWQC (ugH) Benzoic Acid 580 NA NA Phenol 450 5,800 NA 4-Methyl Phenol no NA NA 2 - Methyl Phenol 67 NA NA Benayl Alcohol 53 NA NA 2,4- Dimethyl 53 NA NA­ Phenol 2,4,5- 5.2 240 p lip Trichlorophenol NA; No marine FWQC p; Proposed Criteria

VOCs: The sample was analyzed for VOCs including MTBE and trichlorfluoromethane (freon- 11), Acetone (90 ug/L), methylene chloride (17 ug/L), 2-butanone (21ug/L), toluene (18 ug/L), meta and para xylenes (10 ug/L), MTBE (65 ug/L), and total xylenes (10 ug/L) were detected. No VOCs were detected in the trip blank. Results are similar to those in the 10/03/01 sample, except for the detection of MTBE which is generally associated with oxygenated fuels.

Toxicity: Toxicity testing was performed by the USEPA Region II laboratory on the Tunnel Water Discharge to the Hudson River using a small marine crustacean, Mysidopsis bahia (Mysid) and a juvenile/larval fish species, Menidia beryllina (Inland Silversides Minnow). The tests were 48- Hour exposures and the test endpoint was mortality.

Mysids were more sensitive to the tunnel water than the fish. Following 48 hours of testing, the median lethal concentration (LC50) predicted was 83,5 percent tunnel water. Basically, if 83.5 percent tunnel water was mixed with 16.5 percent clean seawater, then 50 percent of the organisms would not survive. Survival was 97.5 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. Survival in the undiluted and untreated tunnel water was 32.5 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.

TOTAL P.35

CITY_21MC100_006753043

NYC-WTC_000204862