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Soil Investigation Work Plan Heritage Square Page 2 Lr Table 1 --Soil Sample Analytical Results * ample ID Date K 1 1) MO Ne G n-BB n-1113 TB T I IT E X 160 278B-B1-2.0 2/7/2002 <150 1 9,300 7,900 31 700' L2 1.3 16.5 T-1 —F 1.9 1.1 1 8.2 All units are in mg/kg. 1. Gasoline chromatograph does not match typical gas pattern. Analytical: Lo T_Toluene E=Ethyl Benzene X=Total Xylenes G—Gasoline D—Diesel K=Kerosene MO=Motor Oil N—Napthalene n-BB=n-Butyl Benzene n-PB=n-Propyl Benzene TB=Trimethyl Benzenes IT=Isopropyl Toluene Following evaluation of the laboratory analyses,the extent of the pierced fuel line was investigated using a backhoe and Cruz Brothers line locating service. During the backhoe work, additional fuel lines were located south of the B-I borehole. These lines were traced to a fuel tank located near the east side of the LN Heritage Square building. The backhoe was used to expose the top of the fuel tank, which measured three feet wide by ten feet long and is approximately 500-gallons in volume. A shovel handle was lowered inside the tank, and the contents appeared to be a diesel-type of fuel and not a black viscous fluid. The line locating service was used to trace the fuel lines north of B-1 to inside the Heritage Square building and back outside to a second UST located north of the building. A black viscous fluid was +..� present on the stick used to check the contents of the tank. The dimensions of the tank were not investigated. The fuel lines were also traced to an old natural gas-fired boiler located inside the Heritage Square building. On May 22 and 23, 2002, Condor collected one soil sample from beneath the UST located on the east side of the building and eight soil samples from beneath the fuel line outside of the building. The L" samples were analyzed for total lead, kerosene, diesel, and motor oil, and for the same volatile hydrocarbons as sample 3278B-B1-2.0. The sample from beneath the tank was also analyzed for semi- volatile hydrocarbons by EPA Method 8270D. The laboratory analyses of the soil sample front beneath the tank detected diesel at a concentration of 3,800 mglkg. Volatile hydrocarbons were detected at concentrations similar to those detected in soil sample 3278B-B1-2.0. Total lead was detected in each soil sample collected from beneath the piping and UST at concentrations below the PRG for residential � sites and the TTLC. The results of the laboratory testing are forthcoming in a report by Condor. Based on the results from the laboratory analysis, the viscosity of the product present in the pipe, the proximity of the underground piping to both an existing boiler and two USTs, and the apparent age of the boiler, Condor suspected that the former tanks stored bunker or diesel type hydrocarbon fuel. During the course of performing field work at the site, Condor located an abandoned water well on the east side of the Heritage Square building. One water sample was collected from the groundwater surface at a depth of 34 feet and analyzed for gasoline, diesel and volatile hydrocarbons. No constituents of concern were detected in the groundwater sample. A sensitive receptor survey performed by Condor for an adjacent site indicates no state or county records exists for the well. The construction details of the well are not known. The estimated total well depth based on a field measurement is approximately 300 feet. 3.0 SCOPE OF WORK The purpose of the site work is to evaluate the lateral and vertical extent of soil contamination associated with the two existing tanks and related underground piping to the extent feasible. The field work will i CONDOR Lw