NYC-WTC_000204859

NYC 9/11 Public Portal Document

□CT-31-2001 16:45 718 732 452 6464 718 732 452 6464 P.34/35

Preliminary Results:

General Characteristics: The samples were brown in color with a strong acrid odor, Some, but not all of the color, was removed through centrifugation. Total ammonia was elevated with a concentration of approximately 8.7 mg/L. Ammonia is not typically encountered at this concentration in marine surface samples. Salinity in the sample was 12 parts per thousand (path., g/L) which is less than the average of 35 g/L salinity of seawater. There was no residual chlorine present. Dissolved oxygen, detennined in the laboratory, was 2.5 mg/L, lower than saturation indicating an oxygen demand from the sample. The alkalinity of the sample was approximately 140 mg/L. This concentration is slightly higher than would be predicted for a sample with a balanced salinity of 12 path.

Dioxins/Furans: One dioxin and one furan were detected. OCD was reported at a concentration of 53.2 J pg/L, and 1234678-HpCDF was reported at a concentration of 9.2 pg/L. The Toxic Equivalency (TEQ) for the compounds detected in the sample is 0.1 pg/L. This value is less than median TEQs detennined over the last three years by NYSDEC in samples collected during NYNJ Harbor Estuary Contaminant Assessment and Reduction Program (CARP). The median TEQ (n=16) for the eastern NYNJ Harbor is 0.13 pg/'L; the TEQ (n == 20) for the western NYNJ Harbor is 1.3 pg/L.

Metals; Several metals were detected that had not been detected in the Hudson River samples or the 10/03/01 PATH Exchange Place sample. Results for these metals is tabulated below. Results for zinc exceed both the marine acute and chronic Federal Water Quality Criteria for this metal. Chromium and nickel were detected at concentrations slightly greater than the detection Emit. Concentrations of other metals detected in the sample are similar to those detected in the 10/03/01 PATH tunnel discharge sample. Table 1 at the end of this report provides metals data for all non-drinking water WTC disaster samples collected by EPA.

Metal Concentration Marine Acute Marine Chronic (ugH) FWQC (ug/1) FWQC (ug/1) Chromium 8.4 1100* 50* Nickel 6.8 75 8.3 Zinc 210 95 86 • FWQC for Chromium VI, most stringent chromium criteria.

PCB Congeners; The sample was analyzed for 71 PCS congeners. No PCBs were detected in the sample (DL 0.0054 ug/L). NVOAs: Seven (7) non-PAH NVOAs were detected in the sample. Seven PAHs, most substituted napthalenes, were also detected, but all at trace concentrations (< lOug/L). Results are tabulated below. Benzoic acid was detected at the highest concentration (580 ug/L), followed by phenol and several substituted phenols.

CITY_21MC100_006753042

NYC-WTC_000204861