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Harlin Knoll 3 February 1993 San Joaquin County Public Health Services Page 2 Two sparging wells will be installed on the site as a part of the soil/groundwater remediation system. The wells will be constructed of 2-inch diameter, PVC blank and screened casing. The 5-foot-long screen will be placed at the lower extent of the saturated soils containing or encapsulating free-phase hydrocarbons. The location of the wells are shown in Figure la. Soil samples will be collected at 5-foot intervals during borehole drilling, and soil samples collected both above and below static water will be submitted to Pace Incorporated and analyzed for TPH-g and BTEX. The best placement of the screened interval of the sparging wells will be determined by increasing the sampling density near the lower extent of the impacted soils below the water table (well construction details are attached). All drilling, well completion, and sampling will follow EA standard protocols (see Appendix A of EA Report of Well Installation June 1991) which are in accordance with the Tri-Regional Board Staff recommendations and the San Joaquin County-Environmental Health Division guidelines. All field staff will have completed required 40-hour OSHA safety training, and a site-specific Health and Safety Plan will be prepared and followed during well installation and sampling. The field work is tentatively scheduled for the first week of March 1993, if the site access is granted. Underground Service Alert and the County will be notified at least 48 hours prior to any field work related to well installation. Should you have any questions or comments regarding this scope of work, please contact Terry Winsor, Doug Oram, or me. Attached is a check for $89 for the onsite well permit. Sincerely, JOStepek, G. Project Geo ogist JS/ds 73942(2)/LTR293/HK.I Enclosures