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i F Because no detectable soil contamination was encountered during r the field investigation prescribed by RWQCB, and the contamina- tion in the groundwater had diminished with time in both areal extent and concentration, EA recommended a "no action" remedial alternative for the site, with continued quarterly monitoring of the groundwater for one year. The gradual lowering of the groundwater table at the site has E resulted in low water levels in the monitoring wells, and has r hampered groundwater monitoring and sampling since July 1989. At the time of the August 1989 report, water levels were too low to x t permit collection of samples from MW4 and MWS, and well MW3 could - i not be properly purged prior to sampling. Since that time, the water levels in Stockton have recovered significantly (see below) SJCEHD responded to the Exxon/EA Problem Assessment. Report in a letter dated" 5 January 1990 (Appendix A) that requires Exxon to ' respond to concerns expressed about the Final Remedial Plan by both SJCEHD and .the RWQCB. Each ofthese: concerns is addressed individually below, and the remainder of this. report presents all data obtained to date at the site by EA and others, as requested by SJCEHD. These data include recent water: sample analyses and well elevation data collected by EA .since .the date of the last report. k _ 6 1 .2 RESPONSE TO COMMENTS s 1 .2. 1 Concerns of the San Joa uin,-County-Public -Health Service - - - 1 1 The specified concern of SJCEHD as presented in the 5 January f letter..to Exxon, is that groundwater monitoring is no longer possible at the site because three of. the groundwater monitoring we-lls have recently been either completely dry or have contained very little water. SJCEHD has recommended that these wells be _. replaced to permit continued, groundwater monitoring at the site.. e35/71050/2-90/tx : 2 - s