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MINN xu i## i s PRE-TANK REPLACEMENT Site Assessment Results -� 420 WEST KETTLEMAN LANE,L001, CA. A.^gis Project No. 84-013 Page 6 3.3 PETROLEUM HYDROCARBONS IN SOIL A total of eleven soil samples were submitted to a state certified laboratory and analyzed for petroleum hydrocarbons. The results of analyses performed on the soil samples are summarized in Tables 1 and 2. The certified laboratory reports are contained Appendix C. The following subsections present the results of analyses performed on soil samples from the existing and proposed underground storage tank locations. 3.3.1 PETROLEUM HYDROCARBONS IN SOIL: EXISTING TANK BASIN A total of five-soil borings were drilled adjacent to the existing tank basin. Proposed Boring B-4 was deleted due to its proximity to subsurface utilities. Samples B-1/3 (15 ft..) , B-2/3 (15 ft.) , B73/1 (5 ft. ) , B-5/2 (10 ft.) and B-6/1 (5 ft.) from soil borings B-1, B-2, 5-3, B-5 and B-5, respectively, were submitted to a state certified laboratory for analysis (figure 2) . As shown in Table 1, Petroleum hydrocarbons were detected in one sample submitted from this. area. Low level toluenes and xylenes were detected .in sample B-1/3 (15 ft. ) . i Petroleum ;iydrocarbons were not detected in the.remaining samples analyzed from this area (existing tanks) . Sampl,? B-1/3 was also analyzed for Total. 'Lead. The results are presented in Table 2. PID € readings kere zero in all of the samples that were screened, and no E gasoline odors were noted in the field logs (Appendix B) . - 3.3.2 PETROLEUM HYDROCARBONS IN SOIL: PROPOSED NEW TANK LOCATION -A total" "of eightsoil borings were drilled within the proposed new tank .location (figure 2) . Samples B-7/1 (5ft.) , B-8/2 (10 ft.) , B-11%3 (15. ft.) and B-12/2 (10 ft. ) from borings B-7, B-8, B-11 and B- 12,, respectively, were submitted to a state certified laboratory for analysis. As shown in Table 1, petroleum hydrocarbons were detected in. i two."of:the samplt:s submitted from this area (;new tank location) . _ Toluene was detected in sample B-7/1, at 0 004 ppm (parts per million) .: The --TPHti-concentratibrf Bete oted°-;'in?sample,B-8/2;;is ;1";060 .- Petroleum hydrocarbons were not detected in samples B- 11/3 and 8-12/2. The concentration of Total Lead in samples B-7/1 and B-12/2 are presented in Table 2. tPID readings from samples obtained from this area were zero in all cases. The PID:was :non-functional during -:;he drilling of boring B-8; _ .. ... --- - - -- but -;gaspline ."adozs=,w re..notedAn the-fzrst three sai�ples<=obtained..-fror _ A 'faint-gasoline odor was noted in..sample B- 14/1. Gaso]ine odors were not noted in the remaining borings drilled in the proposed new tank.location. (figure 2) • r r�