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I. H. KLEINFELDER &ASSOCIATES -File: S-1008- 21/12:337 Revised: July 8, 1986 r Page 3 I o Well No. 4 -- Lee Hall well located immediately south of Harney Lane Landfill. As noted above, this well is now owned by' San Joaquin County. The locations of these wells are shown on Plate A. Available information on the wells indicates that the Sawyer well is approximately 243 feet deep, and is cased down to 150 feet; the Labor Camp well is approximately 320 feet deep, and is cased down to 164 feet; the Hall well is approximately 233 feet deep, and is cased to 180 feet. Water levels in the wells have been in the range of -15 to -36 feet (from mean sea level) . Plate H shows the approximate ground water surface elevations in August Of 1985. MONITORING OBJECTIVES groundThe itiobjectives at the Harney Lane Landfill are to comply with the Subchapter 15 and Regional Water Quality Control board (RWQCB) requirements, and to provide a long term ground water monitoring program. The monitoring planground water presented in this report is designed to meet these objectives. Subchapter 15 contains specific instructions for monitoring well construction. The existing four wells previously used for monitoring since 1980 do not comply with the current RWQCB requirements. For one reason, well logs indicate solid casing was used to 50 to 80 feet below the ground water table. It also appears that slotted or screened casing may not have been used. Current regulations require that slotted casing span the first ground water table. The dual function of domestic wells has also been discouraged by the State. LOCATION AND INSTALLATION OF MONITORING FACILITIES Plate A shows the preliminary locations selected for four monitoring points. These locations and number of monitoring locations were selected based on regional hydrogeologic information and data collected from the four wells currently being monitored. The proposed locations of the wells are preliminary and may change if additional field information does not coincide with previous information.