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PROBLEM ASSESSMENT REPORT <br /> Moreland Court Shell <br /> 7700 Moreland Court,Stockton, California <br /> Delta Project No 40-88-146 <br /> Page 5 <br /> ' Soil borings B-1 through B4 were advanced near the perimeter of the former underground storage tank area <br /> to an approximate depth of 20 feet below grade Soil borings B-5 and B-6 were advanced at the proposed <br /> ' new tank storage location to an approximate depth of 15 feet below grade Soil samples were collected from <br /> each soil boring every 5 feet with a California-modified sampler equipped with brass tubes One tube from <br /> each sample was sealed and placed in an ice chest at 4° C for storage The soils in the second brass tube <br /> were placed in jars and screened with an hNu meter for total organic vapors Boring logs for soil borings <br /> ' B-1 through B-6 are provided in Appendix A. <br /> Preliminary screening of the soil samples with the hNu meter indicated concentrations of total organic <br /> r vapors ranging from 0 to 2 parts per million (ppm) (Table 2) Soil samples were not sent to the laboratory <br /> for TP14 analysis because field screening did not indicate a problem <br /> TABLE 2 <br /> Total Organic Vapors in Parts Per Million From Pretank Pull Soil Assessment <br /> April 4, 1988 <br /> ' Sample <br /> Depth ft B_1 B_2 BB=3 B_4 BB=5 B_6 <br /> ' 5to65 0 0 0 1 1 1 <br /> 10 to 115 0 1 0 0 1 0 <br /> 15 to 165 0 1 0 2 0 0 <br /> 20 to 215 0 0 0 2 <br /> 'Soil sample not taken <br /> ' On December 27, 1988, three underground storage tanks were excavated, removed, and transported to <br /> Triangle Construction, Inc, Sacramento, California Seven soil samples were collected from the bottom of <br /> the excavation and sent to a state-certified laboratory for chemical analysis of benzene, toluene, <br /> ' ethylbenzene, xylenes (BTEX), TPH, ethylene dibromide (EDB), and organic lead <br /> 1 <br />