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Morita Brothers Service Station 4 July 16, 1992 AH soil boring J14-1) was advanced through the northern end of the former 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 area Boring TH-3 was position between the former leaking tank and product line to provide lateral information on both possible sources Thirty soil samples were sent to Beckman Environmental Laboratory, of Porterville, California, a state-certified laboratory for chemical analysis The soil samples were analyzed for total purgeable hydrocarbons (TPH) as gasoline with a minimum detection limit of 0 5 mg/kg, and the fuel constituent volatile aromatics benzene, ' toluene, ethylbenzene, and total xylenes (BTEX) with a minimum detection limit of 0005 mg/kg using USEPA Test Method 5030/GCFID, and USEPA Test Method 5030/8020, respectively Two soil samples which field screened as having the greatest ' concentrations of gasoline hydrocarbons from both borings TH-1 and TH-2 were submitted for analysis for the presence of total lead with a minimum detection limit ' of 0 025 mg/kg by the USEPA Test Method 7420 Because the results of this analysis exceeded 13 mg/kg, these four samples were also analyzed for soluble lead with a minimum detection limit of 0 5 mg/kg by SW 6010 Three of the thirty samples analyzed contained detectable levels of total purgeable hydrocarbons (TPH) as ' gasoline TPH as gasoline was detected at a concentration of 0 54 mg/kg at a depth of 40 feet in boring T14-1, which was slant drilled 250 to the south from the north side of the 5,000 gallon unleaded gasoline tank excavation TPH as gasoline was not detected ' in boring THA in samples from 25, 30, 35, 45, 50, and 55 feet TPH as gasoline was detected at a concentration of 0 81 mg/kg at a depth of 35 feet in boring TH-3, which was drilled 10 feet northwest of boring TH-1 TPH as gasoline was not detected in ' E13-8101-3 9207-EO37 WP