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First Quarter 1993 <br /> Groundwater Monitoring&Sampling Report <br /> Marital Deduction Trust, Stockton, CA <br /> Page 2 <br /> Benzene, ethylbenzene, xylenes, TPHG and TPHD were present above method detection limits <br /> in monitoring well MW 1 The ethylbenzene and xylenes present were below both Pnmary and <br /> Secondary Maximum Contaminant Levels (MCL), established by the DHS The quantification <br /> for diesel (TPHD) includes all peaks noted including the gasoline range peaks which overlap the <br /> diesel range Therefore the total contaminant concentration reported in the diesel range may be <br /> somewhat misleading Xylenes were present in monitoring well MW3 at 1 9 µg/P, which 1s <br /> below primary and secondary MCL concentrations Monitonng wells MW2 and MW4 reported <br /> nondetectable levels for all requested analytes Laboratory results and chain-of-custody <br /> documentation are presented in Attachment 2 Table 2 summarizes laboratory results since <br /> August, 1990 <br /> Due to the nondetectable constituent concentrations in wells MW2 and MW4, and the low levels <br /> of xylene 1n MW3, RESNA proposes to discharge the purge water from MW2, MW3, and MW4 <br /> to the planter area onsite Second quarter 1993 groundwater monitoring and sampling will be <br /> completed in early June 1993 Your office will be notified prior to any field activities If you <br /> have any questions or comments regarding this matter, please contact John Lane at (209) 838- <br /> 3507 <br /> • Respectfully, <br /> RESNA Industries, Inc <br /> Lois Frantz <br /> Geologist <br /> dJ A'O—� <br /> tin P Lane <br /> rod t Manager <br /> Gregory P. Stah <br /> CA Registered Geologist No 5023 <br /> LF/ggk <br /> Attachments <br /> cc John Dieckman, Trustee <br /> Elizabeth Thayer, CRWQCB, Central Valley Region <br /> • <br /> 1QMR1993 FNL <br />