SITE HISTORY - Laserfiche WebLink

Home Browse Search

r y 06 May 2002 AGE-NC Project No. 02-0913 Page 2 of 4 Assessment Work Plan, dated 21 March 2002. Soil probe borings P-1 through P-4 were advanced utilizing a truck-mounted Geoprobe 5400 equipped with 1.125-inch diameter probe rods using"direct push"technology. Probe borings P-1 and P-2 were advanced vertically at the former UST location to depths of 30 feet below surface grade (bsg). Probe borings P-3 and P-4 were advanced vertically at the former dispenser islands to depths of 40 feet bsg and 20 feet bsg,respectively. The four probe borings were advanced for collection of soil samples. Soil samples were collected at 5-foot intervals to total depth in each boring. Each sample was collected utilizing a 1.125-inch Geoprobe soil sampling assembly loaded with four six-inch brass sleeves. After collection, the ends of the second brass sleeve were covered with Teflon sheets, capped and sealed with tape.Each sample sleeve was labeled with soil probe boring location,depth, time, date and sampler's initials and then placed in a chilled container. The samples were then shipped under chain-of-custody to an analytical laboratory for analysis. Following sample collection,probe borings were backfilled to surface grade with Portland cement. EQUIPMENT DECONTAMINATION Prior to sample collection,the Geoprobe soil sampling equipment was'thoroughly rinsed with clean water after being washed with a solution of Alconox. Geoprobe rods were thoroughly cleaned prior to soil probe boring advancement. ANALYTICAL METHODS The soil samples were transported to Cal Tech Environmental Laboratories (CTEL), a California Department of Health Services-certified laboratory,for analysis. Soil samples P 1-20,P2-20,P3-15, P3-25,P3-40 and P4-10 were analyzed for the following: • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015 Modified; • Benzene,toluene,ethylbenzene and total xylenes(BTEX)and the oxygenated ether methyl- tertiary butyl ether (MTBE) in accordance with EPA`Method 8021; and • MTBE in accordance with EPA Method 8260B. EPA Method 8260B analysis of soil samples P3-15,P3-25 and P3-40 was performed one day beyond the laboratory hold time. Advanced GeoEnvironmental,Inc.