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CreolagkAt recknfcs Inc. • • Page 2 <br /> Work Plan <br /> George's Service <br /> Project No.425.2 <br /> August 14,2002 <br /> 2.0 PROPOSED INVESTIGATION <br /> To further investigate the vertical extent of soil and groundwater impacted with gasoline <br /> range petroleum hydrocarbons, Geological Technics Inc. proposes the following work. <br /> 1. Install one discretely screened monitoring well into the sand layer, approximately 30- <br /> feet bgs,north of the site. <br /> 2. Install one discretely screened monitoring well into the sand layer, approximately 30- <br /> feet bgs, near the former USTs. <br /> ' 3. Install two discretely screened monitoring wells into sand layers, approximately 30 and <br /> 50-feet bgs, near the former pump islands. <br /> 4. Analysis of groundwater samples for natural attenuation parameters. <br /> 5. Quarterly groundwater monitoring. <br /> 2.1 Monitoring Well Installation <br /> ' 30-Foot Wells <br /> GTI proposes to install three, discretely screened, monitoring wells to a depth of <br /> approximately 35-feet bgs. These wells will target the sand and gravel layer encountered at <br /> ' approximately 30-feet bgs. One of the wells, MW-101, will be installed between the former <br /> pump island and building. The second well, MW-2X, will be installed with the cluster of <br /> wells near the former USTs. The third well, MW-106, will be installed north of the site, <br /> between MW-6 and MW-7. This well is proposed in this location because Mr. Birkhahn, <br /> owner of 1697 W. Durham Ferry Rd. has told GTI in the past that he will not allow <br /> additional wells on his property. Figure 2, Site Map, shows well locations. <br /> ' The well borings will be drilled using an 8-inch outside diameter continuous flight hollow <br /> stem auger owned and operated by V&W Drilling (C57# 720904). <br /> ' <br /> 50-Foot Well <br /> GTI proposes to install one, discretely screened, monitoring well to a depth of <br /> approximately 50-feet bgs. This well will target the sandy layer at approximately 45-feet <br /> ' bgs. The well, MW-201, will be installed between the former pump island and building. <br /> Figure 2, Site Map, shows well locations. <br /> The well boring will be drilled using an 8-inch outside diameter continuous flight hollow <br /> ' stem auger owned and operated by V&W Drilling (C57# 720904). <br /> Soil boring permits will be secured as necessary and the local regulatory agency will be <br /> ' notified 48 hours prior to commencing work. The subsurface will be cleared of <br /> underground utilities by notifying Underground Service Alert. <br /> 2.1.1 Soil Sampling Procedure <br /> ' Soil samples will be collected continuously for geological and analytical evaluation in the <br /> deep well, MW-201 and the intermediate well, MW-106. Due to the proximity of MW-101 <br /> to MW-201 and MW-2X to MW-202, these borings will be free drilled. <br /> A boring log providing sediment description using the USCS and field observations will be <br /> maintained by a professional geologist working under the supervision of a registered <br /> ' geologist. Soil samples will be collected in 6.0-inch brass liners using a 2.0-inch modified <br />