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i KEI-P89-1104 .QR4 February 3 , 1992 Page 6 a down-hole camera survey of the six-inch diameter well casing to determine the casing depth and overall condition of the casing. In late June 1990, the down-hole camera survey was conducted at the site. A video tape recording of the survey was made with one copy submitted to the SJCPHS by Purviance Drillers, Inc. The results of the down-hole camera survey and additional field inspection by Purviance Drilling indicated the following: I. Inner casing was 6-5/8 inches O.D. ; the casing consisted of 12-gauge steel, that extends from the surface to a depth of 115 feet below grade and is tarred and belled at joints spaced every 20 feet; 2 . No breaks, holes, or perforations were observed; 3 . Outer casing was ten-inch diameter extending to an unknown depth; 4 . Annulus between six-inch and ten-inch casings was filled with neat cement, and the extent and quality (lack of voids) of the neat cement was unknown; 5. Standing water was at a level at 54.5 feet below grade; 6. At a depth of 125 feet below grade, a well size reduction was indicated when the camera could not pass; and, 7 . Total well depth was measured at 133 feet below grade. A well destruction work plan (KEI-P89-1104 .P4, dated July 19, 1990) was prepared by KEI for the destruction of the abandoned water well. On October 10 and 11, 1990, four two-inch diameter monitoring wells (designated as MW1, MW2 , MW3 , and MW4 on the attached Site Plan, Figure 1) were installed at the site. The monitoring wells were drilled and completed to total depths ranging from 69 to 74 feet below grade. Ground water was encountered at depths ranging from 58 . 5 to 59 . 5 feet beneath ground surface during drilling. Well elevations were surveyed by a licensed land surveyor to Mean Sea Level (MSL) and to a vertical accuracy of 0. 01 feet. The wells were developed on October 18, 1990, and were initially sampled on October 26, 1990.