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East Bay MUD - 4- 10 March 1995 <br /> Memo #1 <br /> B. Since the first three monitoring wells were installed in May 1989, 23 calendar quarters have <br /> passed. We received quarterly reports for 16 quarters. Quarterly monitoring reports were <br /> not submitted for the following quarters: <br /> 1. 3rd Quarter 1989 5. 1st Quarter 1992 <br /> 2. 1st Quarter 1991 . 6. 2nd Quarter 1992 <br /> 3. 2nd Quarter 1991 7. ' 2nd Quarter 1993 <br /> -4. 3rd Quarter 1991 <br /> hweaignficn <br /> A. Without the tank removal reports and data, it is not possible for Board staff to determine <br /> what,, if any, soil removal has been completed, or if additional diesel analyses may be - <br /> necessary. Once we have reviewed the reports,additional soil investigation in the vicinity of <br /> the tanks may be necessary. <br /> B.! The reasons for the difference between regional and local gradients and for the on-site <br /> gradient variations has not been determined. Additional investigation is necessary. <br /> C. MW5 and MW7 have not been sampled since October 1992 and MW2, MW3, MW4, and <br /> MW6 have not been sampled,since December.1993. I was not able to find explanations or <br /> - rationale for not sampling the wells. However, the wells must be sampled annually,-at a <br /> minimum, and justification must be provided'for not sampling more frequently. <br /> Attachments <br />