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I. H. KLEINFELDER &ASSOCIATE'S <br /> monitoring wells was phased to provide forappropriate da <br /> to evaluation <br /> stages• This interim site characterization report relies on existing and <br /> recently <br /> RW-.l. collected subsurface information including MW-4, MW-5, MW-6, and <br /> Characterization of the property began in mid-August 1985, with the <br /> completion of an initial soil boring (refer to Figure <br /> ory <br /> analysis of the soil samples collected from this soil boring.detected tthe <br /> presence of hydrocarbon compounds (refer to Table 2, Appendix A, and <br /> Appendix E). On 27 September 1985, two additional borings were drilled to <br /> a depth of 60 feet and converted to monitoring wells identified as MW-1 <br /> and MW-2 (refer to Figure 2). Samples submitted for laboratory analysis <br /> i- contained hydrocarbon compounds <br /> in both ground water and soils from <br /> t,. locations MW-1 and MW-2 <br /> (refer to Tables > and 3, Appendix A, and Appendix <br /> After evaluation of these initial findings, a third monitoring well <br /> identified as MW--3, was installed for the purposes of assessing the <br /> �H direction of ground water flow, monitoring the distribution of hydrocarbon <br /> compound cont-mination, and to further information of the site geology. <br /> Additional soil samples from three soil borings, identified as 2-1; B-2, <br /> } and 2-3, were also collected to assess the extent of soil contamination <br /> i <br /> (refer to Figure 2, Tables 2 and 3, Appendix A, and Appendix E), <br /> Installation of MW--3 and completion of B-1, B-2, and B-3 occurred on 1 <br /> c <br /> April 1986, and 2 April 1986. <br /> Two borings, identified asB-4 and B-5, were completed in early March <br /> 1987. These soil borings were located in the extreme southwest corner of <br /> the property and were used to determine if the near surface soils were <br /> clean enough to erect a large sign, as required by the County of San <br /> i Joaquin. Laboratory results (refer to Appendix D) indicated hydrocarbon <br /> compounds concentrations within soils at these two locations (southwest' <br /> corner of the property) to be below the limits of detection. Lithology <br /> logs were not obtained for locations B-4 and B-5. The locations were not <br /> surveyed and are not shown on the monitoring well and boring location map <br /> (Figure 2). These borings were completed to idepths above the u' F?ermost <br /> water-bearing unit with hollow stem auger and tremie grouted. <br /> 53-87--443 4 <br />