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1 <br /> 404 WEST FREMONT STREET <br /> WKA No. 1628.09 <br /> August 31 , 2001 <br /> Page 15 <br /> sparging system will be continuously operating and displacing petroleum hydrocarbons into the <br /> vadose and unsaturated zones. Groundwater mounding near the sparging wells will be monitored <br /> to optimize the on-off duty cycle of the well for mass transport enhancement and reduction of <br /> - energy and off-gas treatment costs. <br /> Security/Safety Measures <br /> A locked six-foot-high chain-link fence fitted with privacy slates will secure the air sparging/SVES <br /> at the subject site. Additional safety measures will include the use of "No Smoking" signs and "Do <br /> Not Enter" signs posted on all sides of the treatment enclosure, a mounted fire extinguisher, and an <br /> k" emergency 24-hour telephone number posted on the fence. <br /> Construction Activities and Remediation Systems Operation Time Line <br /> 1 The following are estimated time lines for construction activities and system operations subsequent <br /> to permit approvals: <br /> 1 <br /> Air sparging and soil vapor extraction well installation week 1 <br /> Trenching and subsurface pipe installation week 2 — 3 <br /> Construction of treatment enclosure week 3 — 4 <br /> Installation of remediation equipment week 4 <br /> �- Compliance source tests and verification reports weeks 5 — 7 <br /> System operation Weeks 7 - 9 <br /> Quarterly Groundwater Monitoring and Sampling <br /> J <br /> Monitoring and sampling of groundwater beneath the site will continue to be performed on a <br /> quarterly basis. Quarterly monitoring and sampling reports will be prepared subsequent to <br /> the monitoring and sampling events and will include results of laboratory analysis, <br /> groundwater elevation data, flow direction and the estimated hydraulic gradient beneath the <br /> site. <br /> it <br /> I <br /> �:.•- .r.,i f it---= � As.'�UOCJAI'6�; INC. <br />