WORK PLANS - Laserfiche WebLink

Home Browse Search

Site Background Information, Vanco Truck & Auto Plaza Page 2 of-6 Construction Company; excavated soil was stoc piled on-site for-evaluation prior to transportto Forward Landfill for disposal. During the excavation, soil samples were collected by an AGE representative from the floor of k the piping excavation; the fuel dispenser excavation,and the soil stockpiles for-anE lysis.The laboratory analysis reported total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, respectively);benzene, toluene, ethylbenzene,anc xylenes(BTEX), and the fuel additive methyl tertiary-butyl ether(MTBE)from the areas ol the former piping and fuel dispensers. PREVIOUS SITE ASSESSMENTS On 30 and 31 October 2003, seven soil probe bori gs(B1 though B7)were advanced at the site.A total of 19 soil samples from the sevens it borings were analyzed for petroleum hydrocarbon products: TPH-g and TPH-d were d tected in soil samples collected'from boring B3 at 10 feet.bsg(B3-10)and-15 feet-bsg(B -15)and boring B7 at 30 feet bsg.(B7- 30), at maximum concentrations in sample B3=15 f-47 milligrams per kilogram (mg/kg) TPH-g and 110 mg/kg TPH-d. . Laboratory ch omatograms show that :the TPH-g concentrations were detected within the diesel-ran a spectrum, indicating that the TPH-g may actually be degraded diesel fuel. MTBE and xy enes were detected in soil sample B3- 15 at concentrations of 0:045 mg/kg and 0.10 mg/ g; respectively. Grab ground water samples collected from six of4hseven soil borings were analyzed for petroleum hydrocarbon products. TPH-g and T H-d were detected in ground water samples collected from borings B2-and-84, at-ma imum concentrations in boring B4 of 190,000 micrograms per liter- (pg/1) TPH-g anc 2,200,000 pg/l TPH-d Laboratory chromatograms show that the TPH'g concentrations were detected within the diesel-range spectrum, indicating that the TPH-g may actually be degraded diesel fuel. MTBE was detected in groundwater,samples collected from oring B5 ata maximum concentration of 15 pg/l. No other target analytes were detected at-or above laboratory detection limits in any other of the samples analyzed. On 26 and 27 July 2004; three pilot soil borings were advanced to 35 feet bsg at the site and completed as ground water monitoring wells MIN-1 through MW-3. No constituents oV concern were detected at or above laboratory detection:limits in the soil samples analyzed. On 05 August. 2004, one cone penetration test (CPT) boring (CPT-1) paired with a hydropunch boring was advanced to 100 feet bsg on-site;lithologic data was collected from the initial boring utilizing CPT technology, and soil and grab ground water samples from selected depths were collected from an immediately adjacent twin boring.Two soil samples were collected from CPT-1. In the soil sample colla ted at 60 feet bsg (CPT1y60), TPH-g;- ethylbenzene,and total xylenes were detected atcoi icentrations of 2.1 mg/kg,0.00$mg/kg and 0.017 mg/kg,respectively. In the soil sample co tected at 90 feet bsg(CPT1-90),TPH- g, TPH-d, ethylbenzene, and total xylenes were detected at concentrations of 6.3 mg/kg; A&ancM CeoEavlronmental,Inc.