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1 <br /> Mr Daniel K Barber, P E <br /> Joe <br /> September 9, 2003 <br /> Page 3 of 17 <br />' 1999) Five exploratory boreholes (13-1 through B-5) were advanced to a maximum depth of <br /> 40 feet A total of 20 soil samples and 1 "grab" groundwater sample were analyzed for <br /> t gasoline-, kerosene- and diesel-range hydrocarbons and the associated aromatic <br /> hydrocarbons—benzene, toluene, ethylbenzene, and xylene (BTEX) and methyl tertiary-butyl <br /> ether (MTBE) Site chemicals of concern are discussed in detail in a subsequent section of <br />' this report Elevated concentrations of volatile- and extractable-range petroleum <br /> hydrocarbons and BTEX were detected in both soil and groundwater <br /> Additional site characterization was conducted between December 2000 and January 2001 to <br /> further define the magnitude and extent of site contamination (D K Barber & Associates, <br /> 2002b) Six exploratory boreholes were advanced to a maximum depth of 60 feet, and one <br /> groundwater monitoring well (MW-1) was installed, developed, and sampled Soil samples <br />' (from approximately 5-foot-depth intervals) were collected for laboratory analysis between <br /> depths of 14 and 60 feet <br /> tIn June 2002, an additional five groundwater monitoring wells were installed (MW-2 through <br /> MW-6) and one additional exploratory borehole (D-3) was advanced and sampled A total of <br /> • 32 soil samples were collected for laboratory analysis from depths between 10 and 55 feet <br /> t (D K Barber& Associates, 2002b) <br />' A total of nine groundwater monitoring/sampling events have been conducted in available site <br /> wells between December 2000 and June 2003 <br />' A search for potential vicinity water supply wells was conducted in 2003 at the request of the <br /> regulator This survey was updated for the project site using a previously-conducted (1990) <br />' water well survey for a nearby site (Harding Lawson Associates, 1990) <br /> SITE LITHOLOGY AND HYDROGEOLOGY <br />' Borehole geologic logs for a number of the exploratory bores provide a general indication of <br /> the subsurface conditions and the migrational routes Additional descriptive text of site <br /> tlithologic conditions was available from one additional site subsurface investigation (Gallardo <br /> & Associates, 1999) A total of six boreholes have been advanced and geologically logged, to <br /> ' a maximum depth of 22 feet below grade in 1999 Following the 1999 investigation, <br /> numerous exploratory bores to depths of 60 feet and six monitoring wells were installed by <br /> D K Barber& Associates between 2000 and 2002 <br /> Stellar Environmental Solutions <br /> ' E PROIECTSuoo3 nun Aal«tl100JbDKIivG ludi LbaviR P°n end FlW'°iBFPORT-sepo®6n asom ds <br />