FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

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 VW 1 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 VW 1 (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 VW 1 ( 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 GeoEnvironmental,Inc.