SITE HISTORY - Laserfiche WebLink

Home Browse Search

�- envirosc Soil stockpile samples were collected by removing the top 6 to 12 inches of soil and repeating the procedure described above. Each stockpile sample consisted of four subsamples composited by the lab. 4.0 UNDERGROUND STORAGE TANK REMOVAL Removal of four underground storage tanks and associated soil sampling were conducted on April 25, 1996 with Mr. Kent Miller(SFD), Ms. Letitia Briggs (SJCPHS), and Ms. Linda Turkette(SJCPHS) present to inspect the procedure. The removed tanks consisted of two 5,000 gallon steel, one 8,000 gallon steel, and one 8,000 gallon single-walled fiberglass USTs. Upon removal, each tank was inspected for holes, cracks, pitting, and signs of failure. The steel tanks were found to be in good condition with no visible signs of failure or leaking. The 8,000 gallon single-walled fiberglass UST appeared to have a pinhole leak from the southern end of the tank. The removed tanks were transported by Crosby and Overton for disposal. 5.0 PRODUCT LINE AND DISPENSER REMOVAL Removal of the product lines and fuel dispensers and associated soil sampling was conducted on April 25, 1996 and April 30, 1996. Ms. Letitia Briggs (SJCPHS) was present to inspect the procedure. Inspection of the removed product lines found them to be in good condition with no visible holes or signs of leakage. 6.0 SAMPLING AND ANALYTICAL RESULTS Each soil sample was analyzed for Total Purgeable Petroleum Hydrocarbons quantified as Gasoline(TPPH) according to EPA Method 8015 (Modified),benzene,toluene, ethylbenzene, and xylenes (BTEX) according to EPA Method 8020, methyl-tertiary-butyl- ether(MTBE) according to EPA Method 8020(Modified), and Total Lead according to EPA Method 6010. Sample ST-4 was also analyzed for Organic Lead, STLC Lead, and TCLP Lead. 6.1 UST Sampling Soil samples SE-1 through SE-8 were collected on April 25, 1996 from beneath the former USTs. Samples SE-1 through SE-7 were collected directly beneath each end of the tanks at depths ranging from 14 to 15 feet below grade (fbg). Soil staining was visible beneath the southern end of the westernmost tank. With the approval of the SJCPHS representative, this area was excavated to a depth of 19 fbg, where sample SE-8 was collected. Plate 3 shows the locations of the soil samples and the former USTs. Soil samples SE-2 through SE-7 were ND for TPPH and BTEX compounds, and contained MTBE concentrations ranging from none detected(ND)to 0.76 parts per million (ppm). Soil sample SE-1 contained 0.012 parts per million (ppm) benzene and 0.4 ppm MTBE. Sample SE-8 contained 3.4 ppm TPPH, 0.014 ppm benzene, and 1800 ppm MTBE. 6.2 Dispenser/Product Line Sampling Soil samples ST-2, ST-6, and ST-8 through ST-10 were collected on April 25, 1996 from beneath the former product lines and fuel dispensers at depths ranging from 3 to 5 fbg. Visible staining was apparent in soils beneath the northwestern dispenser island. Over- 370 2