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TABLE 9 ' GROUND WATER ELEVATION MEASUREMENTS (3-26-92) Reference Point Depth To Groundwater ' Date Well# Elevations Water Elevation 3-26-92 MW-1 53 . 74 ' 56 .83 ' -3 . 091 3-26-92 MW-2 54 . 081 57.001 -2.921 ' 3-26-92 MW-3 53 . 591 ----- -__-- 3-26-92 MW-4 53 . 88" 57. 24,1 -3 . 36,1 3-26-92 MW-5 53 . 571 56 .92' -3 . 35, ' 3-26-92 NW-6 52. 99' 56 .11, -3 . 12' 3-26-92 MW-7 53 . 901 57. 53' -3 . 631 3-26-92 MW-8 53 . 68' 57. 34' -3 .661 3-26-92 MW-9 53 . 541 57 . 33 ' -3 . 79' ' 3-26-92 MW-10 53 . 211 56.531 -3 . 321 3-26-92 MW-11 52. 951 56 .991 -4 .041 3-26-92 MW-12 53 . 35" 57 .84 ' -4 . 49' 3-26-92 MW-13 53 . 36' 57 . 90' -4 .54 ' ' 3-26-92 EW-1 53 . 21' 56 .77' -3 . 561 4.0 QUALITY ASSURANCE/QUALITY CONTROL ' All monitoring wells were purged and sampled using a new, sanitary disposable bailer at all sampling points. Prior to the sampling of a monitoring well, a depth to water measurement was taken. Each well was purged of a minimum of three well volumes and/or until the temperature, conductivity Iand PH parameters were stabilized (Appendix D) . Purge water from the sampling activities was stored in metal drums on site for later disposal. The wells were allowed to recover to within 90% of their original water levels prior to sampling. The wells were then sampled with a clean disposable bailer. I The samples were carefully poured from the disposable bailer, into clean glass VOA'S provided by the laboratory. Care was taken to ensure that no air space existed in the vials, by inverting to check for bubbles. The samples were immediately placed in iced storage for delivery to Sherwood Labs Corporation, 8071 N. Lander Avenue, I Hilmar, California. The samples were under no circumstances opened by anyone other than qualified laboratory personnel. The samples were analyzed within the sample life-span limits as set forth by EPA guidelines for the specific tests to be run. STE Project No. 4001 Page 7