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n <br />1.1 PURPOSE <br />The purpose of this work plan is to present the procedures that will be followed to <br />install triple probe soil gas monitoring well at Foothill Sanitary landfill (FHSL). <br />1.2 SITE DESCRIPTION <br />Foothill Sanitary Landfill is located at 6484 N Waverly Rd, about four miles east <br />of Linden, north east of the intersection of Waverly Rd and Flood Rd. (Figure 1).. <br />FHSL is not a closed landfill. <br />1.3 REASON FOR INSTALLING SOIL GAS MONITORING WELL <br />The new soil gas monitoring wells will be installed to replace two existing <br />monitoring wells, SG -8 and SG -4. Well SG -8, is in the area of the next module to <br />be constructed and is too shallow. Solid waste Division would like to install a <br />replacement well before destroying well SG -8 during the construction of the next <br />module. <br />The other existing well, SG -4, is installed in the vicinity of a sand lens. From <br />consecutive monitoring periods, off-site migration monitoring readings from SG -4 <br />has not been very consistent, thus making SG -4 very unreliable in monitoring <br />off-site migration for the north eastern portion of the Landfill. A new soil gas <br />monitoring well is needed to be installed away from the sand lens to accurately <br />monitor off-site migration north eastern side of the landfill. <br />1.4 WELL LOCATION <br />The new soil gas monitoring wells ,SG 110 and SG -120, will be installed along <br />the Northern and Southern perimeter of FHSL (Figure 2). The new wells will be <br />installed at locations conforming to the requirements of final closure, and will be <br />drilled to the lowest elevation of the lowest refuse of the landfill in accordance <br />with newly revised Title 27 Section 20925(c). The location of the new wells will <br />be staked in the field by a land surveyor. <br />After installing the new wells, the monitoring perimeter will be adjusted <br />accordingly, and the Migration Monitoring plan will be revised. <br />Work Plan — Soil Gas Monitoring Well Installation San Joaquin County <br />Corral Hollow Sanitary Landfill Public Works Department <br />Page 3 of 7 Solid Waste Division <br />