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Page 3
<br /> Stockpile Sampling
<br /> • Approximately 1200 cubic yards soil was generated from the UST and product
<br /> piping removal and excavation. Soil generated from UST and product piping
<br /> removal (approximately 200 cubic yards) was sampled at a frequency of one
<br /> discrete for approximately every 25 cubic yards and is represented by samples
<br /> SP-1A, SP-113, SP-1C, SP-1D, SP-2A, SP-213, SP-2C and SP-2D (Figure 2).
<br /> Soil generated from additional excavation(approximately 1000 cubic yards) was
<br /> sampled at a frequency of one four- sample composite for approximately every
<br /> 150 cubic yards for soil disposal and one discrete sample for approximately
<br /> every 25 cubic yards for soil used as backfill material on site. Samples SP-3A-
<br /> D, SP-4A-D, SP-5A-D, SP-6A-D, SP-9A-D and SP-10A-D represent composite
<br /> samples and SP-7A, SP-7B, SP-7C, SP-7D, SP-8A, SP-813, SP-8C and SP-81)
<br /> represent discrete samples.
<br /> Soil represented by SP-113, SP-1C, SP-2A, SP-2C, SP-8A, SP-813, SP-8C, SP-81) was
<br /> used as backfill material on site. Soil represented by SP-1A, SP-1D, SP-2 B, SP-
<br /> 2D, SP-7A, SP-7B, SP-7C, SP-7D, SP-3A-D, SP-4A-D, SP-SA-D, SP-6A-D, SP-9A-D
<br /> and SP-10A-D were transported by STAMCO Trucking of San Martin, California
<br /> and disposed of at Forward Landfill, Inc., Stockton, California.
<br /> . ANALYTICAL RESULTS
<br /> Summaries of the soil analytical results are presented in Table 1 and Certified
<br /> Analytical Reports are presented in Appendix A. The UST excavation, trench and
<br /> stockpile samples were analyzed for Petroleum Hydrocarbons calculated as
<br /> Gasoline (TPH-Gasohne) according to EPA Method 8015 (Modified) and Benzene,
<br /> Toluene, Ethyl benzene, and Xylene (BTEX) according to EPA Method 8020.
<br /> Selected samples were analyzed for Volatile Organics according to EPA SW-846
<br /> Method 8240, Total Lead according to EPA Method SW-846 6010, Total
<br /> Metals(Arsemc, Barium, Cadmium, Chromium, Cobalt, Copper, Lead, Mercury,
<br /> Nickel, Zinc) according to EPA Method 846 6010 & 7000 Series, and Halogenated
<br /> Volatile Organics by EPA SW-846 Methods 5030/8010. Additional analysis was
<br /> performed on samples collected in the area of the former waste oil tank remote
<br /> fill include Total Petroleum Hydrocarbons calculated as Diesel according to EPA
<br /> Method 8015 (Modified) , Semi-Volatile Organic Priority Pollutants according to
<br /> EPA Method 8270, Total Oil and Grease according to EPA Method 5520 E, F,
<br /> Metals (Cadmium,Chromium,Lead,Zinc&Nickel) according to EPA Method 6010.
<br /> Due to an oversight by Superior Precision Analytical, Inc., sample WO-1-2.5" was
<br /> not analyzed by method 8010. A letter of explanation from Superior Precision
<br /> Analytical, Inc. is provided in Appendix A.
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