ARCHIVED REPORTS XR0011119 - Laserfiche WebLink

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1 Morita Brothers Service Station 6 November 6, 1992 �s Based on the soil sampling and analysts, concentrations of TPPH as gasoline and the gasoline constituent volatile aromatics present in the soils at the site exceed current recommended guidelines Additional site characterization was required by the San Joaquin County Department of Environmental Health Services in the vicinity of the north end of the gasoline product pipelines, and beneath the tormer 5,000 gallon underground unleaded gasoline storage tank ESE was retained by Crisp Construction to perform the site characterization Below are the results of the site characterization A total of seven soil borings were drilled within this phase of soil characterization (Figure 2) A soil boring (TH-I) was advanced through the northern end of the tormer eastern 5,000 gallon gasoline tank excavation and slant drilled at 200 from vertical to the south with a bottom hole location beneath the center of the tank to assess the vertical extent of impacted soil beneath this probable source Four soil borings (TH-3 through TH-6) were positioned to assess the lateral extent of gasoline concentrations in the soil A soil boring (TH-2) was advanced adjacent to the former location of the product pipeline adjacent to the northern dispenser island due to the overhanging canopy, and slant drilled at 200 from vertical to the east with a bottom hole location beneath the product line and dispensers to assess the vertical extent of impacted soil beneath this probable source The seventh soil boring (TH-7) was positioned to assess the lateral extent of gasoline concentrations in the soil in this farea Boring TH-3 was position between the former leaking tank and product line to provide lateral information on both possible sources Three of the thirty samples analyzed contained detectable levels of TPPH as gasoline ' TPPH as gasoline was detected at a concentration of 0 54 mgIkg at a depth of 40 feet in boring TH-1, which was slant drilled 250 to the south from the north side of the 5,000 gallon unleaded gasoline tank excavation TPPH as gasoline was not detected in boring TH-1 in samples from 25, 30, 35, 45, 50, and 55 feet TPPH as gasoline was detected at a concentration of 0 81 mg/kg at a depth of 35 Leet in boring TH-3, which was drilled 10 feet northwest of boring TH-1 TPPH as gasoline was not detected in boring TH-3 in samples from 15, 25, 45, and 50 feet TPPH as gasoline was detected at a EB-8101-3 9210-E055 RPT