Lead poisoning prevention fax transmittal, undated

NYC 9/11 Public Portal Document r<irv—T' ‘

Mr. Vincent McGowan BPCPC January 14, 2001. Page 4 of 4

they are the most current and state specific guidelines available. As listed in Table 1 below, all results for soils are less than the state mandated cleanup objectives as listed in 'fable 4 attached to this report.

In addition, Colden has compared all .sample results to the background levels of these heavy metals found in the Eastern United States for additional comparison.

Below is a table summarizing our findings by each contaminant (metal);

Table 1; Results of Metals in Soils Samples and Guideline Standards

Contaminant Range of Analytical Eastern USA Recommended US EPA (Metal): Results of (4) Bulk Background Soil Cleanup (ppm) Soil Samples (ppm’): Levels (ppm): Objective (ppm): Arsenic 2?67^6T 7.5 or SB“ 20 Barium 21.60 - 30.13 15 -600 ” 300 or SB N/A Cadmium _____ _NT7_0A_5____ O.I - 1.0 1.0 or SB N/A Chromium 7.19-17.04 1.5-40 10 or SB N/A Lead 15.92 - 35.44 See Footnote " SB 400 for play 1 areas Mercury' ND 0.001 - 0.2 0.1 N/A Selenium ND 0.1-39 2.0 or SB N/A Silver 0.33 - 0.79 N/A"' SB N./A

1 - For the purpose of clarity, all results are presented ;n pans per mi Ilion (ppm). Laboratory results were reported i.. ...gXg. which is equal to ppm on a one-to-one ratio.

2 - New York State Background Level (SB)

3 - Background levels for lead vaiy widely, Average levels in undeveloped, rural areas may range from 4 - 61 ppm. Average background levels in metropolitan or suburban areas or near highways are much higher and typically fangedrom 200-500 ppm.

4 - Even though silver is not associated with adverse health effects, the EPA establishes exposure limits for many materials based on various endpoints of concern. To our knowledge, silver is the only chemical or substance which has an RfD that is tiot based on ?n adverse health effect, but rather on a cosmetic effect (argyria). While an RfD for silver still exists, in 1991 the EPA deleted the maximum contaminant level, or MCL for silver in drinking water (an enforceable value) and replaced it with a secondary' maximum contaminant level (SMCL) goal (non-enforceable) of0.1 ppm that is twice the previous level, an action that wa.s driven by the recognized low toxicity' associated with silver. (The Silver Council)

ND = None Detected N/A “ Not Available

90-d tr£:60 2002-9S-abW 1.

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