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1 <br /> 1 <br /> • 3.2 SOIL SAMPLING <br /> Soil samples were collected by driving an 18-inch-by-2-inch-diameter California-modified split- i <br /> spoon sampler containing 6-inch brass or stainless steel sleeves ahead of the augers into <br /> undisturbed soil The samples were examined for soil characteristics and screened in the field <br /> with a photo-iomzation detector (PID) to determine the relative hydrocarbon content The soils <br /> are described and the PID readings are recorded on the soil boring logs presented in Appendix E <br /> Selected soil samples were sealed with Teflon tape, capped, labeled, placed in a cooler with ice, <br /> and submitted to a state-certified laboratory for analysis <br />' 3.3 INJECTION POINT PAIR INSTALLATION <br /> Borings IPI through IP3 were completed as nested injection point pairs (IP1A IPIB, IP2A, <br /> IP2B, and IBA, IP3B) Well construction details are summarized in Table 1 and are shown on <br /> the soil boring logs provided in Appendix E <br /> Each injection point borehole was completed with two nested stainless steel injection points (one <br /> point for the potential injection of ozone and one point for the potential injection of hydrogen <br /> peroxide) The boreholes were advanced to a depth of approximately 40 feet The hydrogen <br />' peroxide points (IPIA, IP2A, and IP3A) were installed with a 1-foot section of 1/2-inch-diameter <br /> stainless steel well screen at depths between approximately 29 and 31 5 feet The ozone points <br /> (IMB, IP2B, and IP3B) were installed with a 3-foot length of 3/4-inch-diameter well screen at <br />'• depths between approximately 33 and 39 feet <br /> Each ozone point and hydrogen peroxide point was installed with a sand pack placed from <br />' approximately I foot below the screened interval to a depth of approximately 2 feet above the <br /> top of the screened interval A bentonite seal (approximately 2 feet thick) was placed above the <br /> deeper sand pack and hydrated before the shallower sand pack was established After the <br />' shallower sand pack was established an additional 2 feet of bentonite was placed above the <br /> shallower sand pack and hydrated, followed by cement grout and completion with a protective, <br /> lockable access vault,which was mounted flush to grade <br /> 1 ' <br /> The injection well point installations were completed in accordance with the drilling and well <br /> installation and sampling protocols described in Appendix D and in accordance with local <br />' regulations <br /> 3.4 WELL DEVELOPMENT <br /> Development of the injection points was accomplished during pre-sample purging on 28 <br /> September 2004, with the exception of IP3A, which was dry IP3A was subsequently developed <br />' on 5 November 2004 <br /> r <br /> i <br />' G TTOJectSX73942�MASTER\UWPR1204UPR«xt doc 7 <br />