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Herman& Helen s Manna- Fourth Quarter 1999 Groundwater Monitoring <br /> February 1 2000 <br /> Page -9- <br /> Groundwater elevation measurements collected at the site on December 22, 1999, indicated that the average <br />' depth to groundwater was approximately 6 6 feet below the monitor well and surface water station measuring <br /> points This average depth to water is 0 1 feet greater than measured on September 23, 1999 Groundwater <br /> elevation contours for December 22, 1999, indicate that the groundwater gradient at the site is generally <br />' consistent with the historical groundwater gradient <br /> The laboratory analytical surface water sample data for the fourth 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 4g/1, 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 event During the current monitoring event, however, MTBE was detected in samples DDN <br /> and DDS at much lower concentrations (2 7 and 15 4g/1, respectively) <br /> IAs previously mentioned in Section 2 , Mr Ronald Rowe of the PI1S/E14D has requested that nine soil borings be <br /> installed to further evaluate the eastern extent of groundwater contamination at the site The installation and <br />' sampling of the soil borings is pending receipt of site access authorization from off-site property owners <br /> The next quarterly groundwater monitoring event is scheduled to be conducted in March, 2000 We anticipate <br /> reporting the results of the remaining work described in the work plan addendum concurrently with the March, <br /> I2000, groundwater monitoring results Please call us at (209) 234-0518 with any questions <br /> Respectfully submitted, <br /> CONDOR EARTH TECHNOLOGIES, INC <br /> � <br /> <'�K'< <br /> - <br /> I al <br /> Todd C Hainer '0 Donald F Kresse <br />' Senior Geologist ° �0 <br /> ?n � �� °� California Registered Geologist <br /> Geologist #6430 <br /> 0rr b ac <br /> P 11432 H&Helen'slQuarterly Monitonng Reports12000 Febraaryl4thQuart.2-1 doe <br /> L� CONDOR <br />