WORK PLANS - Laserfiche WebLink

Home Browse Search

VC:L 11-J(7 IU:J4A ENGEO INC- 510 838-7425 P.03 i • `Ir \MW Frank C. Alegre Trucking,Inc. 4203-F1 Former Trucking Facility October 8, 1996 SOIL REMEDIATION WORK.PLAN page 2 Background A 500-gallon waste oil tank was removed form the site in October 1990 under permit with the San Joaquin Environmental Health Division. Three soil samples were recovered from native soils beneath the former tank under the observation of San Joaquin County personnel. No significant concentrations of petroleum hydrocarbons were reported from laboratory analysis of the samples_ No further action was required by San Joaquin County for the former waste oil UST. In September 1996, excavation work on the subject property in the vicinity of the former UST found /V0 petroleum hydrocarbons in soil at depths of 9 to 14 feet. This contamination was outside the area.of the former UST, but has been attributed to the waste oil tank. This work plan has been prepared to address the noted petroleum contamination. Soil Excavation A track-mounted excavator will be used for soil removal. Initially a breaker unit will be used to remove the concrete pad from the proposed excavation area (Figure 2). The excavation will then be extended laterally and vertically based on field observations and vapor/colorimetric screenings. The impacted soil will be removed to the extent feasible subject to physical constraints such as equipment limitations and structural considerations. ENGEO anticipates an excavation 20 to 25 feet in depth over an area of±200 to 300 e, The specific volume of soil to be excavated is not known. ENGEO estimates that 100 to 150 cubic yards of soil will be removed. Remnant pipes, if exposed will also be removed during excavation work. Once physical observations and field screenings indicate the affected soils have been removed, discrete soil samples will be recovered from the excavation base and sidewalls at approximate 20 foot lineal intervals. The specific location and depth of the confirmation samples will be determined in the field. ENGEO estimates that 8 to 10 samples will be recovered from the excavation for laboratory analysis. Composite soil samples will also be recovered from the soil stockpile(s) on a one per 50 cubic yard basis. The soil samples will be recovered in 2-inch-diameter 6-inch-long stainless steel tubes sealed with Teflon plastic end caps and tape. The samples will then be labeled and placed in a coaled ice chest prior to transportation to the analytical laboratory. Laboratory Analysis The excavation samples will be tested for total volatile and extractable hydrocarbons (EPA 8015) and BTEX(EPA 8020). The composite soil stockpile samples will be analyzed for total volatile/extractable hydrocarbons, volatile organics(EPA 8240), sena-volatile organics (EPA 8270) and Title 26 metals.