1. SECTION 1431 OF THE SAFE DRINKING WATER ACT ( SDWA ), 42 U.S.C. SEC. 300I. 2. CUNA DEL VALLE ARTHUR HAROLD IVEY DOROTHY COPLINGER IVEY EL PASO, EL PASO COUNTY, TEXAS 3. THE CUNA DEL VALLE COLONIA IS A SEVERLY DISTRESSED, RU- RUL, RESIDENTIAL DEVELOPMENT LOCATED IN EL PASO COUNTY, TEXAS. THE COLONIA CONTAINS APPROXIMATELY 117 LOTS OF 1/2 ACRE IN SIZE, WITH AN OCCUPANCY RATE OF SOMEWHERE NEAR 75%. BASED ON EPA'S INSPECTION OF THE SITE, WHICH INCLUD- ED INTERVIEWS WITH A SAMPLING OF THE RESIDENTS, THE VAST MAJORITY OF CUNA DEL VALLE RESIDENTS APPEAR TO BE HIS- PANIC OR MEXICAN AMERICANS. THE RESIDENTS INTERVIEWED HAD ALL PURCHASED THEIR LOTS BY MEANS OF A LAND SALES CON- TRACT REFERRED TO AS A CONTRACT FOR DEED . UNDER THESE CONTRACTS FOR DEED, THE RESIDENTS PAY A MINIMAL DOWN PAY- MENT FROM AROUND $100 TO $200 DOLLARS, AND FINANCE THE REST OF THE PURCHASE PRICE OVER A PERIOD OF YEARS. THE MAJORITY OF THE CONTRACTS FOR DEED ENTERED BY THE RESI- DENTS INTERVIEWED WERE FOR TERM OF 20 YEARS AT 12% INTER- EST. ALTHOUGH THE INITIAL PURCHASE PRICE AGREED TO BY THOSE RESIDENTS RANGED FROM $11,500 TO $19,000, DEPENDING ON THE TIME OF PURCHASE, WHEN FINANCED OVER 20 YEARS AT 12% INTEREST, THE TOTAL PURCHASE