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Pis Engineering Science, Inc. <br /> SECTION 1 <br /> INTRODUCTION <br /> SCOPE OF WORK <br /> This work plan addendum describes the objectives, tasks, and methods for additional <br /> remedial investigations at the Applied Aerospace Structures Corporation (AASC) site, <br /> Stockton, California. Quality control procedures, health and safety requirements, and site <br /> background information are discussed in the Work Plan for Phase II Remedial Investigation <br /> (Parsons ES, February 5, 1997). <br /> ' The scope of work addresses one of four actions that were recommended in the Phase II <br /> Remedial Investigation report (Parsons ES, May 1997) and informally approved by the <br /> Central Valley Regional Water Quality Control Board. The principal objective of the present <br /> work is to determine the lateral and vertical extent of chlorinated solvent contamination in <br /> groundwater in the northeast corner of the property. Site investigations will be conducted by <br /> hydraulic push method using a cone penetrometer test (CPT) rig to collect groundwater <br /> samples and gain further information on subsurface stratigraphy and soil properties. <br /> Recommendations for further action at the northeast corner of the property will be developed <br /> and presented in a project report. <br /> PROPOSED WORK SCHEDULE <br /> The additional groundwater site investigation work is planned to begin in mid-January 1998. <br /> The schedule is predicated on regulatory agency acceptance and drilling subcontractor <br /> availability. We plan to complete a draft report in mid-February 1998, approximately three <br /> weeks after receipt of laboratory data packages. <br /> SITE LOCATION <br /> The AASC site is located at 3437 South Airport Way, Stockton, San Joaquin County, <br /> California. Figure 1 shows the general site location. The parcel is bounded on the north and <br /> west by undeveloped land, and to the east by South Airport Way. The property east of South <br /> Airport Way is an older residential development. The adjacent property to the south was <br /> ' formerly a part of the same facility. It is now leased to AASC. More detailed discussions of <br /> site history are given in the first phase Remedial Investigation (RI) work plan (Parsons ES, <br /> June 21, 1996) and in Section 1.4 of the first RI report(Parsons ES,November 1996). <br /> 0997\09072\wks2add 12-1 B-97 1—1 <br />