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Ms. Carol Oz August 12, 1999 Project 791700 Page 7 samples collected from stockpiles SP-1 were submitted to a state-certified anal tical B laboratory and analyzed for TPHG, BTEX y samples collected from SP-1 were composited four to one byquadrantnd total lead. The Analytical results of the four 4-point and one 3-point composite samples col stockpile SP-1 contained concentrations of TPHG ranging from 14 to 380 mg/kg.from Benzene appeared in one stockpile sample at a concentration of 0.48 m gib USEPA Method 8260) was detected in all stockpile samples at concentrations B ran sing from 0.424 to 1.16 mg/kg. In addition, all other oxygenates were below laboratory ranging detection reporting limits. ory Stockpile soil sample analytical results are presented on Table 1. The contains copies of Certified Analytical Reports and chain of custody docmensppendix B After receiving stockpile analytical data, stockpile SP-1 was subsequently removed f the site by Dillard Trucking, Inc. Dillard Trucking, Inc. transported of the stockpileom BFI Landfill, Vasco Road, Livermore, California. The soil stockpile disposal manifest at included in Appendix D. is NEW UST INSTALLATION AND EXCAVATION BACKFILL PROCEDURES Henderson Construction replaced the original two 10,000-gallon and one-8,000 with 20,000-gallon USTs. With the new USTs in place, the excavation was backfilled with two gravel on June 21 through 23, 1999. The UST complex was backfilled to witpe hi a approximately 1 foot of surface grade. Henderson placed the backfill in accordance with the contract specifications. A/B was imported and placed for the asphalt base. After backfillin actio' Henderson paved the area with asphalt. g activities concluded, CONCLUSIONS The petroleum hydrocarbon impacts were identified in the northern and southwestern of the former gasoline UST complex at depths of 17 to 18 feet bgs. Former UST co parts soil samples indicate the impacts are distributed in the northern and southwestern complex the former gasoline UST complex part of concentrations range from 240 to 11,000 m� T-1-N, T-2-N, and T-3-N). Detected TPHG southern and southeastern corner of the foe UST complex did. Soil samples enot d ontain from the central- at concentrations exceeding method reporting limits (T-2-S, and T-3-S). S dewall samples P CP\E:\ARCO\2186\REPORTS\2186P105.DOC-95 lsg:l AurHacee