Letter with attached data regarding Current MCL Standards
& MILLER, INC. nvironmental Services Ground Water Engineering Hydrocarbon Remediation Education March 17, 1993 Ana Gloria Ramos, P.E. Tutu Environmental Investigation Committee P.O. Box 364269 San Juan, Puerto Rico 00936-4269 Re: Current MCL Standards Dear Ms. Ramos: The enclosed tables (labeled as Table 1 through 5) provide the current Maximum Contaminant Levels (MCLs) for volatile organic compounds (VOCs), base neutral and acid extractables (BNAs), metals, cyanide, and pesticides/PCBs that were detected in Sampling Rounds 1 through 7 during the period September 1990 through September 1992. Please call if you have any questions. Sincerely, GERAGHTY & MILLER, INC. Thomas V. Danahy Senior Scientist/Project Manager A - Daniel A. Nachman Vice President/Project Director c: Jose Agrelot, Soil Tech Caroline Kwan, USEPA PR01301-WP3/031793B.LTR/df:lcb TUT 006 1652 201 West Passaic Street, 3rd Floor• Rochelle Park, New Jersey 07662-(201) 909-0700-FAX (201) 909-0567/0568 *64833* 64833 Table 1. …
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& MILLER, INC. nvironmental Services Ground Water Engineering Hydrocarbon Remediation Education March 17, 1993 Ana Gloria Ramos, P.E. Tutu Environmental Investigation Committee P.O. Box 364269 San Juan, Puerto Rico 00936-4269 Re: Current MCL Standards Dear Ms. Ramos: The enclosed tables (labeled as Table 1 through 5) provide the current Maximum Contaminant Levels (MCLs) for volatile organic compounds (VOCs), base neutral and acid extractables (BNAs), metals, cyanide, and pesticides/PCBs that were detected in Sampling Rounds 1 through 7 during the period September 1990 through September 1992. Please call if you have any questions. Sincerely, GERAGHTY & MILLER, INC. Thomas V. Danahy Senior Scientist/Project Manager A - Daniel A. Nachman Vice President/Project Director c: Jose Agrelot, Soil Tech Caroline Kwan, USEPA PR01301-WP3/031793B.LTR/df:lcb TUT 006 1652 201 West Passaic Street, 3rd Floor• Rochelle Park, New Jersey 07662-(201) 909-0700-FAX (201) 909-0567/0568 *64833* 64833 Table 1. USEPA Maximum Contaminant Level Standards for Volatile Organic Compounds Detected in Sampling Rounds September 1990 through September 1992, Tutu Wells Site, St. Thomas, U.S. Virgin Islands. Compound Current MCL Chloromethane —— Vinyl chloride 2 Methylene chloride 5 Acetone — — Carbon disulfide - — 1,1—Dichloroethene 7 1.1—Dichloroethane - — cis-l,2-Dichloroethene* 70 trans-l,2-Dichloroethene* 100 Chloroform — — 12—Dichloroethane 5 Bromodichloromethane ** Trichloroethene 5 1,1,2-Trichloroethane 5a Benzene 5 2—Hexanone — — Tetrachloroethene 5 Toluene 1,000 Chlorobenzene —— Ethylbenzene 700 Xylenes (total) 10,000 Maximum contaminant level (MCL) standard in micrograms per liter (parts per billion [ppb]). Other Volatile Organic Compounds (VOCs) were analyzed but not detected in any wells in any sampling rounds. USEPA U.S. Environmental Protection Agency. * - No MCL established for this compound. * Results reported as sum of cis— and trans—isomers. * * Sum of trihalomethanes MCL is 100 ppb; no MCL established for this specific compound. a Effective Janaury 17,1994. All other values currently in effect. PRO 1301 -Tl/<B1793B/df GERAGHTY* MILLER. INC. ™T Table 2. USEPA Maximum Contaminant Level Standards for Base Neutral and Acid Extractable Compounds Detected in Sampling Rounds September 1990 through September 1992, Tutu Wells Site, St. Thomas, U.S. Virgin Islands. Compound Current MCL bis(2-Ethylhexyl)phthalate — Di- n—octylphthalate - — Other Base Neutral and Acid Extractable compounds were analyzed but not detected in any wells in any sampling rounds. - — No maximum contaminant level (MCL) established for this compound. PR01301-Tl/OJ1793C/df GERAGHTY & MILLER. INC. TUT °06 1654 Table 3. USEPA Maximum Contaminant Levels for Metals Detected in Sampling Rounds September 1990 through //—\ September 1992, Tutu Wells Site, St. Thomas, U.S. Virgin Islands. Analyte Current MCL Aluminum — — Cadmium 500 Calcium — — Chromium 100 Cobalt — Copper -— (treatment-based standard) Iron — Lead — — (treatment—based standard) Magnesium — Manganese — Mercury 2,000 Nickel 100,000 Potassium - — Selenium 50,000 Silver — Sodium —— Vanadium — — Zinc - — f^ Maximum contaminant level (MCL) standards in micrograms per liter (parts per billion [ppb]). Other analytes were analyzed but were not detected in any well in any sampling rounds. — — No MCL established for this analyte. PR01301-Tl/031793d/lcb GERAGHTY & MILLER, INC. TUT °°6 16S5 Table 4. Maximum Contaminant Level for Total Cyanide Detected in Sampling Rounds September 1990 through September 1992, Tutu Wells Site, St. Thomas, U.S. Virgin Islands. Analyte Current MCL Total cyanide was not detected in any well in any sampling rounds. The maximum contaminant level (MCL) standard for cyanide, effective January 17,1993, is 200 micrograms per liter (parts per billion [ppb]). PR01301-Tl/031793Cncb TUT OOA 1656 GERAGHTY & MILLER. INC. Table 5. Maximum Contaminant Levels for Pesticides and PCBs Detected in Sampling Rounds September 1990 through September 1992, Tutu Wells Site, St. Thomas, U.S. Virgin Islands. Analyte Current MCL Pesticides and PCBs were not detected in any wells in any sampling rounds. MCL Maximum contaminant level. PROUOl-Tl/OSlTMgrteb GERAGHTYc? MILLER. INC. TUT °°6 1657