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Herman& Helen i Marina fiord Quertcr 1908 Groundwater Morntonng November 23 1998 Page. 10 Groundwater elevation mi,asuremcnts collected ,it the, site on 5c,ptcmher 30, 1998 indicated that the average I depth to groundwater was approximately 5 feet hg-,, which is consistent with groundwater elevation measurements collected on June 26 1998 Groundwater elevation contours for September 30 1998, indicate that the groundwater gradient at the site is generally t-onsistent with that measured on September 18, 1997, December 31, 1997, March 27 1998, and June 26 1998 Toluene was detected in the upstream surface, water sample (DDN) at a concentration of 2 3 p.g/l None of the I other B rE.X constituents or 1 PH-Cr were detected at or above the laboratory reported detection limits in this sample BTE X and rpt1-(, were not detected in any of the three remaining surtace water samples MTBE: was detected at or above the laboratory reported detection limit in all of the surfdLC water samples except the sample collected from the vicinity of the pump house in the island drainage channel None of the remaining selected gasoline oxygLnates/additives were detected at or above the laboratory reported detection limits in any of the surface water samples MTBh (2 0 µg/1) was the only analyte of interest detected at or above the laboratory reported detection limits in the marina's pre-treated drinking water (2 0 Itg/1) Chloroform, bromodichloromethane, and dibromo- chloromethanc were detected in the marina's treated drinking water at concentrations of 18, 6 1, and 3 0 }ig/l, respectively Chloroform, bromodichloromethane, and dibromochloromethane appear to be byproducts of the marina's drinking water treatment system As previously mentioned in Section 2 , Mr Ronald Rowe of the PEES/EIfD has requested that nine soil borings be installed to further evaluate the eastern extent of groundwater contamination at the site The installation and sampling of the soil borings is pending receipt of site access authorization from off-site property owners The next quarterly groundwater monitoring event is scheduled to be conducted in December, 1998 We anticipate reporting the results of the remaining work described in the work plan addendum concurrently with the IDecember, 1998, groundwater monitoring results Please call us at (209) 234-0518 with any questions Respectfully submitted, ' CONDOR EARTH TECHNOLOGIES, INC Todd C Hafner No 6430 onald F Kresse Senior GeologistcJ'J `Q alifornia Registered OQ�� Oc Ot\ Geologist#6430\k P 11432 H&Helen'slQuarterly Monitoring Reportsl1998-October\Rpt-Herm &Helens 11-23-98 doc ttitT CONDOR