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Marital Deduction Trust January 17, 1992 <br /> Project No WO174 <br /> Page 2 <br /> An investigation was conducted to determine whether water level measurements are affected by <br /> tidal forces Table 2 shows the relevant tidal. data (Hal Schell's 1990 and 1991 EZ Delta Tide <br /> Tables) during all quarterly monitoring events from August 1990 through December 1991 This <br /> data shows that tidal influences have little effect on groundwater monitoring <br /> Laboratory results determined that petroleum hydrocarbons, above method detection limits, were <br /> detected in monitoring wells MW1 and MW2 Monitoring well MWI contains detectable levels <br /> of benzene, ethylbenzene, xylenes, and TPHG Monitoring well MW2, which consistently has <br /> been non-detectable through August 1990, had a measurable toluene constituent of 0.8 µg/f <br /> This detection may have been caused by cross contamination and will be closely watched in the <br /> Second Quarter, 1992 Monitoring Report Laboratory results with chain-of-custody documents <br /> are presented in Attachment 2 Table 3 summarizes laboratory results since August, 1990 <br /> Because constituent concentrations in MW2 and MW3 were ND or below action levels, we <br /> propose to discharge the purge water from MW2 and MW3 to the planter area onsite or to the <br /> facility stormwater system If this is not acceptable, please contact our office as soon as possible <br /> so we may dispose of the water during our next scheduled sampling in February 1992 <br /> • If you have any questions or comments regarding this matter, please contact me or Nora Kataoka <br /> at (209) 838-3507 <br /> Respectfully, <br /> RESNA Industries <br /> 44./ ''`_/ , <br /> Michael A Delgado <br /> Project Engineer <br /> Nora H. Kataoka <br /> Registered Civil Engineer <br /> CA No 38322 <br /> MD/gk <br /> Attachments <br /> cc Mr John Dleckman, Trustee <br /> LR010792 MD <br />