COMPLIANCE INFO_1999 - Laserfiche WebLink

Home Browse Search

UST Closure Report Sharpe Defense Distribution Region West Lathrop,California Paae 13 the trenches. In general, the samples were taken at previous sites of the five main fuel dispensers and at 90° bends in the piping direction. They were analyzed by GeoAnalytical Laboratories, Inc on February 5 to 11. 4.1.10 Stockpile SPD Samples (SPD-1 to SPD-20) Mr. Chrun of GeoAnalytical Laboratories, Inc. collected 20 soil samples from stockpile SPD on February 11. Stockpile SPD comprised soil from stockpiles SPA and SPA that had been mixed, aerated and moved to a new site south of 3rd Avenue. The samples were collected with a hand auger from sites 10 feet apart and staggered at random distances on either side of the centerline of the stockpile. Each sample represents 40 cubic yards of the stockpiled material, estimated from the stockpile dimensions (4 by 16 by 325 ft) to contain 800 cubic yards. All 20 discrete samples were analyzed by GeoAnalytical Laboratories, Inc. on February 11 to 16. 4.2 Sample Handling Soil samples were collected in 6-inch long, 2-inch diameter brass tubes. After filling the sample tube, it was capped with Teflon tape then a plastic cap, appropriately labeled, and refrigerated pending shipment to the analytical laboratory. All samples were packaged with fresh ice or ice packs and packing material. Plastic, waterproof ice chests were used for transporting samples. Samples were packed within the chest such that they did not touch one another during shipment. Chain-of-custody forms were signed and sealed in "zip-lock" plastic bags and affixed to the top, inside lid of each ice chest. The ice chests were delivered by Neil O. Anderson or GeoAnalytical to North State Environmental or GeoAnalytical Laboratories, respectively. Chain-of-custody procedures were used for tracing the possession and handling of individual samples from the time of field collection through laboratory analysis. Documentation of custody was through a chain-of-custody record that lists each sample and the names of individuals responsible for sample collection, shipment, and receipt. A copy of the chain-of-custody form is included in Appendix 4. 5.0 RESULTS OF CHEMICAL ANALYSES Nearly all samples were analyzed for the following parameters: • TPH-D and TPH-G (total petroleum hydrocarbon as diesel and as gasoline) by EPA Method 8015M at North State Environmental and EPA Methods 3550/LUFT and 5030/LUFT, respectively, at GeoAnalytical Laboratories; • Benzene, ethyl benzene, toluene and total xylenes (BETX)by EPA Method 8020; • Volatile organics (oxygenates, including MTBE, DIPE, ETBE and TAME) by EPA Method 8260 (20 samples were initially analyzed by EPA Method 8020); and • Total Lead by EPA Method 8020. NAPROJECTS\3546\Reports\3546 UST Closure Report Draft.doc March 24,1999