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PROBLEM ASSESSMENT REPORT ' Moreland Court Shell 7700 Moreland Court, Stockton, California Delta Project No 40-88-146 Page 13 ' 3.2 Soil Sample Collection and Screenma A 2-inch-inside-diameter California split-spoon sampler was used to extract soil samples from the soil borings Three 6-inch-long brass tubes were inserted into the California sampler to retain each soil sample ' Upon retrieval, one brass tube was capped, packaged, and preserved according to EPA procedures for possible chemical analysis Soil from one of the brass tubes was extracted and placed in a sealed glass jar ' until completion of drilling activities Appendix E,Section 11,contains soil sampling details A description of the soil boring samples collected is provided in the soil boring logs contained in Appendix D The headspace of each sample placed in a glass lar was screened for total organic vapors utilizing a PID Appendix E, Section 13, describes the detailed soil-screening procedures Based on this screening, soil ' samples from each boring were submitted for chemical analysis Results of PID screening are provided on the soil boring logs provided in Appendix D 3 3 Soil Sample Analytical Results Three additional soil borings were advanced and sampled on August 1 and 2, 1990 Soil samples were collected at 5-foot intervals and screened with a PID for total organic vapors Two of the soil borings (SB-9 ' and SB-10) were advanced to approximate depths of 70 0 and 40 0 feet below grade, respectively Two soil samples from SB-9 and three from SB-10 were collected and submitted to a state-certified laboratory for chemical analysis The third soil boring was advanced to 415 feet below grade and converted into a ' monitoring well (MW-1) Two soil samples from MW-1 were submitted to a state-certified laboratory for chemical analysis All of these samples were analyzed for concentrations of TPH, BTEX, and total lead The results of these analyses are presented in Table 7 The laboratory reports for the soil boring samples collected in August 1990,are presented in Appendix G Soil boring logs for soil borings SB-9 and SB-10 and monitoring well MW-1 are provided in Appendix D