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The cover is maintained to prevent ponding and soil erosion <br /> per Title 27, California Code of <br /> Regulations. Any ponding and erosion are reported and repaired when conditions allow, but <br /> before the next winter. Resurfacing and re-compacting of the top surface of the primary and <br /> secondary sites were completed by December 2003. In February 2005, repairs were made to the <br /> west side slopes of the primary site by filling cracks, tamping and re-seeding to establish <br /> vegetation. In October 2005, some slope erosion near the southeast corner of the primary site was <br /> observed. This area was repaired in November 2005. In January 2006, an area to the east of the <br /> previous repair experienced some additional slope erosion. The area was protected by placing a <br /> plastic liner over the exposed area and secured with sandbags to prevent any further erosion or <br /> water infiltration. Further investigation determined that a drain inlet near this area was not <br /> operating correctly, allowing water to accumulate near the edge of the slope and eventually cause <br /> the erosion. The drain inlet was secured and is now operating correctly. Repairs to the slope will <br /> be made as soon as weather conditions allow and will be documented in a future report. <br /> LFG Collection System <br /> Landfill Gas Mi ration <br /> An LFG monitoringplan was implemented p p merited m 1991. This plan included installing perimeter <br /> migration monitoring wells along a monitoring perimeter to depths as required in Title 27. Each <br /> well is comprised of three nested probes, allowing the measurement of soil gas quality at various' . . <br /> depths. Measurements taken for the first monitoring event at these wells indicated combustible <br /> gas contents up to 60 percent at the property perimeter, which exceeds the-5 percent regulatory <br /> limit. <br /> The County analyzed for VOCs in gas samples taken from the perimeter monitoring wells on <br /> February 20, 1992. Analytical results reported six VOCs. The similarity between the VOCs in the <br /> perimeter monitoring wells and those detected in groundwater indicated LFG as a possible source <br /> of the contamination at MW-2. <br /> Based on these findings, an active LFG Collection System was proposed as corrective action to <br /> mitigate both perimeter LFG migration and groundwater contamination. <br /> Harney Lane Sanitary Landfill 1-2 Department of Public Works/Solid Waste <br /> 1"Quarter 2007 Groundwater Monitoring Report County of San Joaquin—April 15,2007 <br />