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Herman&Helen%Manna -Third Quarter 1999 Groundwater Monitoring <br /> October 26 1999 <br /> Page-S- <br /> TABLE 5 <br /> Historical Surface Water Monitoring Data <br /> B T E X TPH-G Gasoline Oxygenates/Additives <br /> Detection DATF 03 03 03 06 005 l 0- 10 <br /> limits µg!I 4g/1 4g/1 µg/1 mg/l µg/1 <br /> Sample I D <br /> DDN 10/1/98 ND 2 3 ND ND ND l6 (MTBE) <br /> DDS 10/l/98 ND ND ND ND ND 4 7 (MTBE) <br /> IDCE 10/U98 ND ND ND ND ND 1 2 (MTBE) <br /> IDCW 10/1/98 ND ND ND ND ND ND <br /> DDN 12/30/98 ND ND ND ND ND 1 4 (MTBE) <br /> DDS 12/30/98 ND ND ND ND ND 1 0 (MTBE) <br /> IDCE 12/30/98 ND ND ND ND ND ND <br /> IDCW 12/30/98 ND ND ND ND ND ND <br /> DDN 3/26/99 ND ND ND ND ND 980(MTBE) 9 8 (TAMF) <br /> DDS 3/26/99 ND 83 ND ND ND* 3,500 (MTBE) 28 (TAME) <br /> IDCE 3/26/99 ND ND ND ND ND ND <br /> IDCW 3/26/99 ND ND ND ND ND 2 2 (MTBE) <br /> DDN 6/30/99 ND ND ND ND ND 5 4(MTBE) <br /> DDS 6/30/99 ND ND ND ND ND 1 8 (MTBE) <br /> IDCI~ 6/30/99 ND ND ND ND ND ND <br /> i DC W 6/30/99 ND ND ND ND ND 1 4 (MTBE) <br /> DDN 9123/99 06 ND ND 09 ND l 7 (MTBE) <br /> DDS 9123/99 ND ND ND ND ND ND <br /> I IDCE 9/23/99 ND ND ND ND ND ND <br /> IDCW 9/23/99 ND ND ND ND ND 1 6 (MTBE) <br /> All concentrations are inµg/]except TPH-G which is in mg/l. <br /> I 13TFX =btnzt,nt, toluene ethyl benzene and xylene <br /> TPH-G-total petroleum hydrocarbons quantified as gasoline <br /> ND - not detected at or above laboratory reported detection limit <br /> I <br /> ND* =not detected at or above a raised laboratory reported detection limit,see laboratory report for detection limit <br /> Gasoline Oxygr nates/Additives=methyl tertiary butyl ether(MTBE),ethanol,tertiary-butanol <br /> di-isopropyl ethLr(DIPS) ethyl tertiary-butyl ether(FTBE) and tertiary amyl methyl ether(TAME) <br /> I5 SUMMARY/CONCLUSIONS <br /> On September 23, 1999, Condor conducted quarterly groundwater and surface water monitoring at Herman & <br /> Helen's Martha located at Venice Island Ferry in Stockton, California Laboratory analytical results of the <br /> groundwater samples collected during the third quarter, 1999, monitoring event are generally consistent with <br /> historical quarterly groundwater analytical data However, benzene and total xylenes were detected for the first <br /> time in the groundwater sample collected from MW-3 <br /> Groundwater elevation measurements collected at the site on September 23, 1999, indicated that the average <br /> I depth to groundwater was approximately 6 5 feet below the monitor well and surface water station measuring <br /> points This average depth to water Js 0 3 feet greater than measured on June 30, 1999 Groundwater elevation <br /> contours for September 23, 1999, indicate that the groundwater gradient at the site is generally consistent with <br /> the historical groundwater gradient <br /> Itot CONDOR <br />