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Task Z Soil and Groundwater Investigation <br /> T will investigate subsurface sail and groundwater using a two-phased approach. The first <br /> phase will include the use of a direct-push technology rig to collect groundwater samples, The <br /> second phase will include the installation of groundwater monitoring wells: <br /> A. Groundwater Grab Sampling <br /> 1T will collect groundwater samples from three locations using a Geoprobe 5400 Direct <br /> Penetration Technology (DPT) rig. These baring locations (Figure 1 have been identified to <br /> evaluate the concentrations of aviation gas and jet fel hydrocarbons ,radiating from the known <br /> plume so that monitoring wells can be positioned accurately. From these borings, soil samples <br /> will also be collected at ten-foot intervals to further define the extent of impacted soil. <br /> S. Monitoring Well Installations <br /> Following the groundwater grab sampling and analysis, fo :r, 70 foot deep groundwater <br /> monitoring wells will be installed. The approximate locationso these proposed webs are shown <br /> on Figure 1. The wells will be installed in 8 inch. diameter soil borings drilled by a. truck <br /> mounted drill rig equipped with:hollow stein augers. Each of the wells will be constructed <br /> 24.wch diameter polyvinyl chloride (PVC) well screen and blank casing. Each well head will <br /> be secured with: a itraC5c-rued. street box, <br /> waste srtl geteii during the drilling will b stockpiled rim site l`pr future dispflsal, The <br /> soil will be spread out Thinly on op of'plii sheeting and allowed to aerate: <br /> C. Laboratory clysis <br /> From each Geop robe boring location, one groundwater sample will be sul� €ttcti ;to � <br /> laboratory fora lysis of Total Petroleum Hydrocarbons (TPH)-as:j t ft#el; `l'T'H as-avian <br /> gasoline, benzine, toluene; ethvinenene and xyleies (BTEX),-and methyl tertiary b.. J. <br /> (MTBE) bJ EPA ll etlto s 8015f8020 on a standard turnaround time of ter► working days. <br /> From each of the than Geoprobe s6 borings and four bnutn of <br /> sail samples will be submitted to the laboratory for analysis of TPP-as-jet fuel, TPH-as-avian <br /> .. <br /> as, <br /> BTEX and 11+i'I EV <br /> 3 <br />