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City of Stockton A68104 024 June 6, 1996 Page 9 4.3 Disposal of Drill Cuttings, Decontamination Rinsate, and Well Purge Water The analytical results of soil and groundwater samples collected from the soil borings and monitoring well installed during the assessment work did not detect PPCs Based on these analyses, it is presumed that the drill cuttings, decontamination rinsate, and well purge water do not contain detectable concentrations of PPCs Therefore with the approval of SJCPHS, it i,, recommended that the City of Stockton dispose of this material on site Drill cuttings may be used in routine landscape maintenance for fill dirt Decontamination rinsate, and well purge water may be discharged for irrigation on the ground surface Well casing and pieces of annular seal may be disposed of in normal waste disposal containers 4.4 Technical Report Upon completion of field and laboratory activities, a technical report will be prepared summarizing results and findings (including the well destruction report) Finally, a recommendation requesting site closure will be presented r 50 SITE SAFETY PLAN The site safety plan for Twining personnel assigned to this project is presented in Appendix B 60 LIMITATIONS The proposed work is intended to be an interactive process Additional work may be required to more fully assess the extent of petroleum product migration in soil The purpose of a geologic/hydrogeologic study is to reasonably characterize existing site conditions based on the geology/hydrogeology of the area In performing such a study, it is understood that a balance must be struck between a reasonable inquiry into the site conditions and an exhaustive analysis of each conceivable environmental characteristic ' Conditions of interest may exist at the site that cannot be identified by visual observation alone Where subsurface exploratory work is performed, our professional opinions are based in part on interpretation of data from discrete sampling locations that may not represent actual conditions or unsampled locations If conditions of interest are not identified during performance of the work, such a finding should not be construed as a guarantee that such conditions do not exist at the site During the installation of the monitoring well at the subject project site, "pea gravel" fill was observed between the concrete cap and approximately 14 feet below site grade The presence of this material may greatly increase the amount of neat cement slurry needed to backfill the borehole after overdrilling the well This may also increase the time required