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i <br /> unleaded gasoline tank, . one. 250 g.all.on used-oil tank, and two .500 <br /> gallon-1 e a d-e-d--g-a-s-o I n-e--.tan-k-s --A 5 5--g-a.l-l-o-n—d-r-u-m—cont-ai-n-i n g u s-e d--.- <br /> i <br /> oil was also removed from the site (Figure , 2.') . <br /> In order to remove all- of the associated contaminated soil ,. <br /> i <br /> Warren E. Gomes Excavating , Inc . of Rio Vista , on February 25 , I ' <br /> 1984 , excavated an area approximately 40 ft . by 40 ft . by 22 ft . <br /> deep . This excavation was centered in the area of the two 500 <br /> z <br /> gallon fuel tanks . The excavated material was left on site and <br /> covered with Visqueen . F <br /> After reviewing the sampling results from the tank pull and <br /> t h e e x c-a vat i-o-n--p..r_o-c_e-d u s e s-, S a n..Jo-a-q u.inC.o u.n t_y;E.n v i-r-o n m e n t a 1 <br /> Health Officials requested that confirmation samples from the <br /> base of the excavation be obtained . <br /> In order to confirm that the excavation is adequate , Condor <br /> proposes to install two soil borings .in the former excavation. <br /> i <br /> (Figure 2) . A single soil sample will be taken from each boring <br /> from just below the backfill/native soil interface . The borings <br /> will be drilled with a 7 . 75 inch O .D . hollow-stem continuous- <br /> flight auger equipped with "a modified Californ'ia split spoon <br /> sampler ( See Attachment 1 for Condor ' s soil boring procedures) . <br /> Samples will not be collected- in the backfill of either boring . <br /> I <br /> Page - 2 <br /> CONDOR k <br />