Re: Notice of Intent for the Remediation General Permit
TABLES Table 1 Summary of Groundwater Quality Data Assembly Row - Block 8 Somerville, MA LOCATION NPDES RGP-1 NPDES RGP-2 Maximum Average Units SAMPLING DATE 8/16/2018 8/16/2018 Detection Detection Anions by Ion Chromatography Chloride ug/l 476,000 286,000 476,000 381,000 Sulfate ug/l 256,000 333,000 333,000 294,500 Dissolved Metals Antimony, Dissolved ug/l <4 7.9 7.9 4.95 Arsenic, Dissolved ug/l 2.6 2.3 2.6 2.45 Cadmium, Dissolved ug/l <0.2 <0.2 BDL BDL Chromium, Dissolved ug/l <1 2.4 2.4 1.45 Copper, Dissolved ug/l <1 11.3 11.3 5.9 Iron, Dissolved ug/l 18,800 <50 18,800 9,413 Lead, Dissolved ug/l <1 <1 BDL BDL Mercury, Dissolved ug/l <0.2 <0.2 BDL BDL Nickel, Dissolved ug/l <2 2.5 2.5 1.75 Selenium, Dissolved ug/l <5 <5 BDL BDL Silver, Dissolved ug/l <0.4 <0.4 BDL BDL Zinc, Dissolved ug/l <10 <10 BDL BDL General Chemistry Chromium, Trivalent ug/l 32 <10 32 18.5 Solids, Total Suspended ug/l 510,000 41,000 510,000 275,500 Cyanide, Total ug/l <5 <5 BDL BDL Chlorine, Total Residual ug/l <20 <20 BDL BDL pH (H) SU 6.8 11 11 8.9 Nitrogen, Ammonia ug/l 1,650 5,690 5,690 3,670 TPH, SGT-HEM ug/l <4400 <4000 BDL BDL Phenolics, Total ug/l <30 <30 BDL BDL Chromium, Hexavalent ug/l <10 <10 BDL BDL Microextractables by GC 1,2-Dibromoethane ug/l <0.01 <0.01 BDL BDL Polychlorinated Biphenyls by GC Aroclor 1016 ug/l <0.25 <0.25 BDL BDL Aroclor 1221 ug/l <0.25 <0.25 BDL BDL Aroclor 1232 ug/l <0.25 <0.25 BDL BDL Aroclor 1242 ug/l <0.25 <0.25 BDL BDL Aroclor 1248 ug/l <0.25 <0.25 BDL BDL Aroclor 1254 ug/l <0.25 <0.25 BDL BDL Aroclor 1260 ug/l <0.2 <0.2
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