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Y <br /> M Gilmartin Project No 1232 <br /> October 7, 1998 <br /> Page 2 of S <br /> • Task 2 —Design and Planning <br /> g <br /> The following steps will be performed under this task <br /> • Development of equipment specification packages, interaction with potential bidders, <br /> and selection of vendors <br /> • Evaluation of utility requirements and interaction with cleettical, gas and telephone <br /> companies <br /> • Development of piping, electrical, and fence specifications <br /> • Development of well installation specifications, interaction with potential bidders, and <br /> selection of drilling contractor <br /> • Development of construction schedule <br /> Task 3 —Installation. of Wells <br /> The following steps will be performed under this task <br /> • Revision of proposed well construction standards based on the latest ground water <br /> monitoring data and EPA recommendations for conducting air-sparging remediation <br /> • Installation of eight remediation wells <br /> • Collection of soil samples during well installation. and testing two soil samples from <br /> each boring for TPH-G and BTEX by EPA Method 8021 <br /> • Installation of eight well boxes <br /> Task 4 —Installation of Piping <br /> The following steps will be perforated under this task <br /> • Cutting of the asphalt or concrete and excavation of approximately 700 linear feet of <br /> two-foot deep trenches <br /> • Installation of 4-inch diameter main vapor extraction header made of Schedule 40 <br /> PVC and 2-inch diameter branches of the same material to individual vapor extraction <br /> wells <br /> • Installation of 2-inch diameter main sparging air header made of Schedule 80 PVC <br /> and 1-inch diameter branches of the same material to individual air sparging wells <br /> : <br /> n0j10[eCti011 of Vapor elltraction anu air sparging pipes to correspondent VVclis Vla cut- <br /> off valves of the same diameter as piping <br /> • Pressure testing of the piping (section by section) <br /> • Backfiring trenches, compaction, and paving in compliance with City of Stockton <br /> code <br /> ENVIRONMENTAL AUDIT,INCA <br />