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1.0 INTRODUCTION Pursuant to a stipulation and agreement filed on July 3, 1981, in San Joaquin County, California, Occidental Chemical Corporation (OCC) is in the process of remediating groundwater beneath and adjacent to the J.R. Simplot Facility at 16777 South Howland Road, Lathrop, California (the Site), (see Figure 1). In March, 1996, pursuant to a recommendation made in OCC's 1994 Annual Report, Groundwater Remedial Program, Lathrop, California, an evaluation was carried out of the permanent monitoring well network at the Site. The purposes of the evaluation were to determine which permanent monitoring wells were presently in need of replacement based on physical observation and performance characteristics, and to develop a longterm replacement schedule for the eventual replacement of all wells. The results of the evaluation were presented in the April 1, 1996 "Longterm Permanent Monitoring Well Replacement Schedule Report" The evaluation found that a complete longterm schedule could not be developed. It was, however, determined that the performance of ten wells had decreased sufficiently to warrant replacement over the next two years. Of these ten wells, six (PW4-196, PW8-150, PW19-88, PW24-50, PW24-148 and PW24-190) are scheduled to be replaced in 1996 while the remaining four (PW4-58, PW9-119, PW12-73 and PW22-160) are to be replaced in 1997. This workplan has been prepared to address abandonment of the original wells and installation of the replacement wells. The following sections of this workplan provide a summary of relevant Site historical and operational information and a discussion of the proposed replacement and abandonment procedures. 1