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` SUMMARY Group A Organics Relatively insignificant changes in groundwater concentrations of Group A organics have been noted to date, supporting the previous hydro- geologic estimates of slow hydraulic movement in the aquifer system surrounding Occidental Chemical 's Lathrop plant site. DBCP continues to be found in a significant number of permanent monitoring wells in the study area, often exhibiting random transitory variations uncharac- teristic of a centralized radially decreasing plume. DBCP and Sulfolane are the only organics found in any domestic well to date, with DBCP concentrations above the State action level of 1 .0 ppb recorded in one of the 29 wells monitored. Group A Inorganics Group A inorganic measurements have been relatively static to date, again indicative of the slow hydraulic movement in the aquifer system surrounding Occidental 's Lathrop plant site. Group B Organics Group B organic compounds found during the October-November, 1981 sam- pling period also correspond closely to the measurements of a year earlier. The majority of these constituents were not found in any permanent well monitoring location (i .e. Aldrin, Chlordane, DDD, DDT, DEF, Dieldrin, Heptachlor, Methyl Parathion, Sevin, Toxaphene) and no Group B organics were found in any domestic wells monitored. Group B Inorganics Radium 22 Gross Alpha and Beta October-November, 1981 98 measurements were basically consistent with measurements of a year earlier, with no time-related or spatial trends observed.