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N ' M Site Background Information : Stallworth Auto Sales Page 6 of 11 wells at concentrations of 3 . 0 pg/I and 5.4 pg/I , respectively. On 26 and 27 January 2006 , soil boring CPT-5 was advanced off-site, at 540 North California Street utilizing CPT technology to model the geologic and hydrogeologic framework and to assess potential dissolved petroleum migration from the site . Lithologic data was collected from an initial CPT soil boring ; adjacent borings were then advanced to collect grab ground water samples from selected depths . Soil boring CPT-5 was advanced to a total depth of 200 feet bsg . Ground water samples were collected from the CPT boring at the following intervals : 59 to 63 feet bsg , 72 to 75 feet bsg, 104 to 108 feet bsg , 117 to 121 feet bsg , and 171 . 5 feet and 174. 5 feet bsg . On 31 January 2006 , soil probe borings P-521 - 1 , P-521 -2 and P-521 -3 were advanced off- site at 521 East Oak Street, the dirt parking area to 537 East Oak Street, utilizing a van- mounted Geoprobe 5400 direct-push probing unit. All borings were advanced to 44 feet bsg, and a grab ground water sample was collected at total depth of each boring . Ground water was encountered at approximately 42 feet bsg and stabilized at approximately 37 feet bsg in each soil boring . No analytes of concern were detected in the grab ground water samples collected from CPT-5 and probe borings P-521 - 1 , P-521 -2 and P-521 -3 . On 18 , 19 and 20 April 2007 , two additional ground water monitoring wells (MW-7 and MW-8) and four vapor extraction wells (VW- 1 through VW-4 ) were installed at the site . Pilot borings VW1 and VW3 were completed as vapor extraction wells with slotted screen installed from approximately 20 to 30 feet bsg ; pilot borings VW2 and VW4 were completed as vapor extraction wells with slotted screen installed from approximately 10 to 20 feet bsg ; pilot boring MW7 was completed as a ground water monitoring well with slotted screen installed from approximately 60 to 70 feet bsg ; and pilot boring MW8 was completed as a ground water monitoring well with slotted screen installed from approximately 59 to 69 feet bsg . • A total of fifteen soil samples collected from pilot soil borings VW1 through VW4 and MW7 were analyzed ; constituents of concern were detected in eight of the soil samples analyzed . • TPH-g was detected in three soil samples collected from VW1 ( 20 feet, 25 feet and 30 feet) , three soil samples collected from VW3 ( 20 feet, 25 feet and 30 feet) , and two soil samples from MW7 (60 feet and 70 feet) ; concentrations ranged from 1 . 1 mg/kg ( MW7-70 ) to 6 , 800 mg/kg (VW3-20 ) . BTEX constituents were detected in three soil samples collected from VW1 ( 20 feet, 25 feet and 30 feet) , three soil samples collected from VW3 ( 20 feet, 25 feet and 30 feet), and one soil sample from MW7 (70 feet); maximum concentrations Advanced CeoEnvironmental, Inc.