ARCHIVED REPORTS XR0009013 - Laserfiche WebLink

Home Browse Search

, 0 CAMBRIA In February 1996, Enviros, Inc (Enviros) drilled two GeoProbe borings (GP-1 and GP-2) in the vicinity of the UST complex to investigate the extent of petroleum hydrocarbons detected during the December 1994 tank removal activities Enviros drilled one angle boring beneath the UST complex and one vertical boring adjacent to the UST complex Soil samples collected from both borings did not contain detectable concentrations of petroleum hydrocarbons, but did contain methyl tertiary butyl ether(MTBE) at concentrations ranging from 2 2 to 29 ppm WORK TASKS Over-excavation If field observations or an organic vapor monitor indicate petroleum hydrocarbon presence in soil beneath the UST excavation, dispensers, piping, or hoists, soil over- excavation may be performed A Cambria geologist will be on-site to direct the excavation contractor in the removal of soil, to collect soil samples, and to document field observations The extent of over-excavation (if performed) will be determined in the field by the Cambria geologist Cambria does not anticipate over-excavating more than 200 cubic yards of soil Confirmation samples will be collected when over-excavation is complete Samples collected from the gasoline UST, dispensers, and piping areas will be analyzed for TPPH by EPA Method 8015 (modified), benzene, toluene, ethylbenzene, xylenes (BTEX), and MTBE by EPA Method 8020, and fuel oxygenates (TBA, MTBE, ETRE, DIPE, and TAME) by EPA Method 8260 Samples collected from the waste oil UST area will be analyzed for TPPH and total extractable petroleum hydrocarbons as diesel by EPA Method 8015 (modified), oil and grease by 5520 D&F, BTEX and MTBE, chlorinated hydrocarbons by EPA Method 8010, and cadmium, chromium, lead, nickel, and zinc by EPA Method 6010 Soil Stockpiling Soils excavated from the tank pit and product line trenches and any potential over-excavation soils will be stockpiled on-site Cambria will collect one composite sample (consisting of four sub-samples) for every 100 cubic yards of soil generated The excavation contractor, Paradiso Mechanical (Paradiso) of San Leandro, California, would like to re-use the excavated soil to backfill the tank pit To accommodate this, the stockpile samples will be analyzed on a rush turn around time, and the data will be submitted to SJCPHS for approval Any additional soil not re-used will be disposed of at an appropriate landfill facility Paradiso will comply with SJCPHS compaction testing requirements 240-0955 2