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! Mr Tom Busenbark Protect No 880-039 lA <br /> July 7, 2003 <br />! Page 5 <br /> Second Quarter 2003 System Performance Summary <br /> rPounds TPHg removed since startup 3,176 <br /> Pounds TPHg removed during this reporting period 3 <br />' TPHg daily removal rate during reporting period(pounds per day) <0 03 <br /> TPHg destruction efficiency(%) 808 <br /> TPHg emission rate to atmosphere(pounds per day) <0 06 <br /> Pounds benzene removed since startup 45 <br /> Pounds benzene removed during this reporting period 0 <br /> Benzene Destruction Efficiency(%) NA <br /> Benzene emission rate to atmosphere(pounds per day) 0 <br /> Average flow rate for this reporting period(scfm) 36 <br /> System uptime during this reporting period(days/0%) 63 days 169% <br /> ADDITIONAL WORK PERFORMED <br /> On March 24 and April 4, 2003, Shaw oversaw the installation of three additional <br /> monitoring wells Two of the wells were completed to a depth of 30 feet with screen <br /> between 15 and 30 feet One of the wells is a dual completion well with one casing to a <br /> depth of 50 feet with screen from 35 to 50 feet, while the other casing is to a depth of <br /> 80 feet, with screen from 75 to 80 feet Full details of the well installation procedures, <br /> sampling data, analytical results, and boring locations are presented in a separate report, <br /> dated June 18, 2003 <br /> CONCLUSIONS <br />! Analytical results of groundwater samples collected from the site were generally consistent <br /> with previous sampling events Groundwater elevation increased between 0 23 and <br /> 0 59 feet from the previous sampling event (February 11, 2003) in all wells The observed <br /> groundwater gradient during the second quarter 2003 was 0 003, with flow to the east <br />! N\sacDA2003\Prf\880\8800391A 3af doc Shaw Environmental, Inc <br />