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Herman& Helen ,Marina Third Quarter 1999 Groundwater Momtotwg <br /> October 26 1999 <br /> Page-9- <br /> The laboratory analytical surface water sample data for the third quarter 1999, monitoring event are generally <br /> representative of historical data, with the exception of the first quarter, 1999, data During the first quarter, 1999, <br /> monitoring event, MTBE was detected in samples DDN and DDS (980 and 3,500 µg/i, respectively) at <br /> significantly higher concentrations than in previous and subsequent monitoring events Additionally, the only <br />' surface water sample detections of TAME were reported in samples DDN and DDS during the first quarter, <br /> 1999 monitoring i vent During the current monitoring event, however MTBE was detected in sample DDN at a <br /> much lower concentration (1 7 µg/l), and was not detected in sample DDS MTBE was detected for the third <br /> Itime in the sample collected from IDCW (1 6 4g/1) <br /> As previously mentioned in Section 2 , Mr Ronald Rowe of the PffS/EHD leas requested that nine soil borings be <br /> installed to further evaluate the eastern extent of groundwater contamination at the site I'he installation and <br /> Isampling of the soil borings is pending receipt of site access authorization trom oft-site property owners <br /> The next quarterly groundwater monitoring event is scheduled to be conducted in December, 1999 We <br /> anticipate reporting the results of the remaining work described in the work plan addendum concurrently with the <br /> December, 1999, groundwater monitoring results Please call us at(209) 234-0518 with any questions <br /> Respectfully submitted, <br /> CONDOR EARTH TECHNOLOGIES, INC <br /> Todd Ilafner onald I~ Kresse <br /> Senior Geologist �ml -E4=Q , alifornia Registered Geologist <br />' ,�•z f ' eoIogist #6430 <br /> r <br /> I -- <br />' P 11432 It&ileh n s\Quarterly Monitoring Reportsk1999-OctoberOrdQuart 10-26 doc <br /> I <br /> I <br />' tJ <br /> CONDOR <br />