SAN ANTONIO WATER SYSTEM Composite Analysis Analytic Results from

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1 Analytic Results from Compiled by: Concentration Range State Compliance CONSTITUENTS Found MCL Analyses Radium 226 (pci/l) 0.8(+/ 0.1) Radium 228 (pci/l) <1.0 to 1.2 GROSS BETA(pCi/L) <4.0 to * GROSS ALPHA(pCi/L) Particle Activity <2.0 to 4.3 (+/ 1.1) 15 * Alkalinity, Bicarbonate (AS CaCO3) mg/l 124 to 263 Alkalinity, Carbonate (AS CaCO3) mg/l ND Alkalinity, Hydroxide(As CaCO3) mg/l ND Alkalinity, Phenolphthalein mg/l ND Alkalinity, Total (AS CaCO3) mg/l 124 to 263 Specific Conductance (μmhos/cm) 396 to 607 ph UNITS 7.4 to ** Total dissolved solids (mg/l) 242 to ** Hardness (AS CaCO3) mg/l 198 to 316 ( ) CONSTITUENTS Concentration Range Found MCL Metals (Method E200.7 and E200.8 ) (parts per million) (parts per million) Aluminum < J to to 0.2 ** Antimony < J to * Arsenic < to * Barium to * Beryllium < J to * Cadmium < J to * Calcium 11.2 to *** Chloride 8.22 to ** Chromium to * Copper < to * Fluoride 0.07 to * Iron <0.05 to ** Lead J to * Magnesium 2.93 to *** Manganese < J to ** Mercury < * Nickel J to Selenium J to * Silver < J to ** Sodium 7.05 to Sulfate 10.4 to ** Thallium < J to Zinc J to ** Nitrogen, Nitrate (AS N) <0.05 to * ( )To convert Hardness from mg/l to Grains Per Gallon divide mg/l by 17.1 J - Analyte Detected Below Quantitation Limits * National Primary Drinking Water Standard - MCL ** National Secondary Drinking Water Standard - MCL MCL - Maximum Contaminate Level

2 VOLATILE ORGANICS Concentration MCL Trihalomethanes Range Found EPA Method Chloroform <1.0 to *** Bromodichloromethane <1.0 to *** Dibromochloromethane <1.0 to *** Bromoform <1.0 to *** Dibromomethane <0.50 *** VOLATILE ORGANICS REGULATED COMPOUNDS 1,1 Dichloroethyene < * 1,1,1 Trichloroethane < * 1,1,2 Trichloroethane < * 1,2,4 Trichlorobenzene < * 1,2 Dichlorobenzene < * 1,2 Dichloropropane < * Benzene < * Carbon tetrachloride < * Chlorobenzene < * CIS 1,2 Dichloroethene < * Dichloropropane <0.50 *** Ethylbenzene < * Monochlorobenzene <0.50 *** o Dichlorobenzene < para Dichlorobenzene < Styrene < * Tetrachloroethene <0.50 to * Toluene < * trans 1,2 Dichloroethene < * Trichloroethene < * Vinyl chloride < * m&p Xylene <0.50 to 0.97 *** o Xylene <0.50 to 2.68 *** Xylenes Total <0.50 to ** VOLATILE ORGANICS MONITORED COMPOUNDS 1,1,1,2 Tetrachloroethane <0.50 *** 1,1,2,2 Tetrachloroethane <0.50 *** 1,1 Dichloroethane <0.50 *** 1,1 Dichloropropene <0.50 *** 1,2,3 Trichlorobenzene <0.50 *** 1,2,3 Trichloropropane <1.00 *** 1,2,4 Trimethylbenzene <0.50 *** 1,3,5 Trimethylbenzene <0.50 *** 1,3 Dichlorobenzene <0.50 *** 1,3 Dichloropropane <0.50 *** MCL - Maximum Contaminate Level * National Primary Drinking Water Standard - MCL ** National Secondary Drinking Water Standard Page 2

3 VOLATILE ORGANICS Concentration MCL MONITORED COMPOUNDS Range Found 2,2 Dichloropropane <0.50 *** 2 Chlorotoluene <0.50 *** 4 Chlorotoluene <0.50 *** 4 Isopropyltoluene <0.50 *** Bromobenzene <0.50 *** Bromochloromethane <0.50 *** Bromomethane <1.00 *** Butyl benzene <0.50 *** Chloroethane <1.00 *** Chloromethane <0.50 *** cis 1,3 Dichloropropene <0.50 *** Dichlorodifluoromethane <1.00 *** Hexachlorobutadiene <0.50 *** Isopropylbenzene <0.50 *** Naphthalene <0.50 *** n Propylbenzene <0.50 *** sec Butlybenzene <0.50 *** tert Butylbenzene <0.50 *** trans 1,3 Dichloropropene <0.50 *** Trichlorofluoromethane <0.50 *** SCREENED COMPOUNDS 1,2 Dibromo 3 chloropropane < ,2 Dibromoethane < Butanone(MEK) <5.00 *** 2 Hexanone <5.00 *** 4 Methyl 2pentanone (MIBK) <0.50 *** Acetone <5.00 *** Acrylonitrile <5.00 *** Carbon disulfide <0.50 *** Dibromochloropropane < Ethyl methacrylate <5.00 *** Ethylene dibromide < Iodomethane <0.50 *** Methyl methacrylate <5.00 *** Methyl t butyl ether (MTBE) <5.00 *** Tetrahydrofuran <5.00 *** Vinyl acetate < E504.1 EDB,DBCP, and 123TCP Regulated Dibromochloropropane (DBCP) <0.02 *** Ethylene dibromide (EDB) < Unregulalted 1,2,3 Trichloropropane <0.01 *** National Primary Drinking Water Standard - MCL Page 3

4 SEMIVOLATILE ORGANIC COMPOUNDS Concentration MCL CHLORINATED PESTICIDES Range Found EPA Method E Aroclor 1016 <0.08 Aroclor 1221 < Aroclor 1232 < Aroclor 1242 < Aroclor 1248 < Aroclor 1254 < Aroclor 1260 < Chlordane < Toxaphene <1.0 1 SEMIVOLATILE ORGANIC COMPOUNDS EPA Method E Alachlor < Atrazine < Benzo[a]pyrene < alpha Chlordane < gamma Chlordane < trans Nonachlor <0.20 *** Di(2 ethylhexyl) adipate < Di(2 ethylhexyl) phthalate <2.0 6 Endrin < Heptachlor < Heptachlor epoxide < Hexachlorobenzene < Hexachlorocyclopentadiene < Lindane < Methoxychlor < Pentachlorophenol <1.0 1 Simazine < Monitored Compounds Acenaphthene <0.20 *** Acenaphthylene <0.20 *** Aldrin <0.20 *** Anthracene <0.20 *** Benzo(a)anthracene <0.20 *** Benzo[b]fluoranthene <0.20 *** Benzo[g,h,i]perylene <0.20 *** Benzo[k]fluoranthene <0.20 *** Bromacil <0.20 *** Butachlor <0.20 *** Butylbenzylphthalate <2.0 *** 2 Chlorobiphenyl <0.20 *** Chrysene <0.20 *** Dibenz[a,h]anthracene <0.20 *** Di n butylphthalate <2.0 *** 2,3 Dichlorobiphenyl <0.20 *** Page 4

5 SEMIVOLATILE ORGANIC COMPOUNDS Concentration MCL Monitored Compounds Range Found EPA Method E Dieldrin <0.20 *** Diethylphthalate <2.0 *** Dimethylphthalate <2.0 *** Fluorene <0.20 *** 2,2',3,3',4,4',6 Heptachlorobiphenyl <0.51 *** 2,2',4,4',5,6 Hexachlorobiphenyl <0.20 *** Indeno[1,2,3 cd]pyrene <0.20 *** Metolachlor <0.20 *** Metribuzin <0.20 *** Naphthalene <0.20 *** 2,2',3,3',4,5',6,6' Octachlorobiphenyl <0.51 *** 2,2',3',4,6 Pentachlorobiphenyl <0.20 *** Phenanthrene <0.20 *** Prometon <0.20 *** Propachlor <0.20 *** Pyrene <0.20 *** 2,2',4,4' Tetrachlorobiphenyl <0.20 *** 2,4,5 Trichlorobiphenyl <0.20 *** Trifluralin <0.20 *** Regulated Compounds Toxaphene <1.0 3 Chlorodane <0.20 *** Endrin < Heptachloro epoxide <0.20 *** Page 5

6 HERBICIDES Concentration MCL EPA Method E515.4 Range Found 2,4,5 TP (Silvex) < ,4, D < Dalapon < Dinoseb < Pentachlorophenol < Picloram < Unregulalted 2,4,5 T <1.00 *** 2,4 DB <5.00 *** 3,5 Dichlorobenzoic <1.00 *** Acifluorfen <2.00 *** Bentazon <5.00 *** Chloramben <5.00 *** Dicamba <1.00 *** Dichlorprop <2.00 *** CARBAMATES E531.1 REGULATED Aldicarb < Aldicarb sulfone < Aldicarb sulfoxide < Carbofuran < Oxamyl < Unregulalted 3 Hydroxycarbofuran <1.00 *** Baygon <1.00 *** Carbaryl <1.00 *** Methiocarb <1.00 *** Methomyl <1.00 *** PAHs Compound ug\l Acenaphthene < Acenaphthylene < Anthracene < Benzo[a]anthracene < Benzo[a]pyrene < Benzo[b]fluoranthene < Benzo[g,h,I]perylene < Benzo[k]fluoranthene < Chrysene < Fluorene < Indeno[1,2,3,c,d]pyrene < Naphthalene < Phenanthrene < Pyrene < Page 6

7 HERBICIDES Concentration MCL EPA Method E515.4 Range Found PCBs Conc. Units: ug/l 2 Chlorobiphenyl <0.2 *** 2,3 Dichlorobiphenyl <0.2 *** 2,4,5 Trichlorobiphenyl <0.2 *** 2,2',4,4 Tetrachlorobiphenyl <0.2 *** 2,2',3',4,6 Pentachlorobiphenyl <0.2 *** 2,2',4,4',5,6' Hexachlorobiphenyl <0.2 *** 2,2',3,3',4,4',6 Heptachlorobiphenyl <0.51 *** 2,2',3,3',4,5',6,6' Octachlorobiphenyl <0.51 *** Phthalates++ Conc. Units: ug/l Butylbenzylphthalate <0.2 *** Di n butylphthalate <2.0 6 Dimethylphthalate <2.0 *** Page 7