FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

TABLE 1 ANALYTICAL RESULTS OF TANK REMOVAL SAMPLES CALDRON'S GENERAL STORE November 14, 1991 mg/kg Sample TPH as Ethyl- ID Gasoline Benzene Toluene benzene Xylene S 1 @9' ND ND ND ND ND N1@9' ND ND ND ND ND S2@9' 2.8 0.085 0.060 0.120 0.290 N2@9' ND ND ND ND ND Excavation ND ND 0.5 ND 1.2 Water* mg/kg - parts per million(ppm) ND - None Detected •Remdu in;%/L- parts per billion(ppb) 3.0 PROCEDURES 3.1 Excavation of Impacted Soil Excavation of the former tank pit took place from November 30 to December 1, 1993. A backhoe and operator were supplied by Stokley Construction of Tracy. Excavation was centered in the area of the former underground storage tanks (USTs). A photo-ionization detector (PID) was used to screen the excavated soil for the presence of volatile hydrocarbon vapors and direct the backhoe.Excavation was terminated when no vapors were detected. Soil was excavated to a depth of seven to eight feet.Approximately 125 cubic yards of impacted soil were removed from the excavation. ~ At the direction of Mr. Steve Sasson of the PHS/EHD, five soil samples were collected from the sidewalls of the excavation. Sample W-1 was collected directly from the wall of the excavation. The other four samples were collected from the backhoe bucket. Samples were collected in pre-cleaned 2-inch by 3-inch brass tubes. For each sample, both ends of the sample tube were covered with aluminum sheets, capped and sealed with tape. The samples were stored on ice and transported under chain-of-custody in a chilled container to Alpha Analytical Laboratories (AAL) in Ukiah, California for analysis. All soil samples from the site were collected, preserved and transported in a similar manner. Each sample was - analyzed for TPH as gasoline and BTE&X. The sample from the most northerly portion of the excavation (N-1) was also analyzed for TPH as diesel and motor oil. The sample locations are shown on Figure 3. 0..i.y.1 n.&s.M.K aI— 4 CALIMO —OM-n