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<br /> 09 April.1-997 �; , x: f2 f M l F
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<br /> 3 AGE NC Project NO.r96
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<br /> f. Page 3 of,4
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<br /> 4.0. _:FINDINGS
<br /> L 4:1. STRATIGRAPHY :; �5 *.
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<br /> C-1 was encountered froiri'surface rade to a ro imatel 7 feet"bs Silt.to sand silt, wasF
<br /> ' ' encountered fromv7 feet to 28:=feet-bsg. Fron128.'feet bsg to the.termiriation deptli.of 45;feet tlie'soifyi
<br /> type cohsists_of clay.,Ground water,:was not encountered during probing The boring log is included r
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<br /> 4.2,- LABORATORY ANAL-YSIS..FOR PETROLEUM HYDROCARBQNS,
<br /> I Organic vapor was detected iri duplicate samples.from probe-borxng'P1'at-concentrations as'h-igh as ° f
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<br /> �. 57 pari per'millionvolurrie(ppmv). TPH g was`_de'tected=in soil_samples collected atVdeptHs_of-;15 and -
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<br /> " 30 feet at-concentrations of i,6;parts per million(ppm,repotted as-milligrams per kilogram)ah-d 1 6 Y r
<br /> ppm,.respectively ,:Toluene,:ethyibenzerie and`xylenes.were detected of concentrations of 0:0067
<br /> -ppm, 0.0061--pprii acid 4 20:pprn, respectively,"in-the_s&mple:colletted from a_ddpth of 30 feet-bsg: '
<br /> - ; MTBE'was detected in.the sarnple-collected�from.a depth of 40 feet bsg at.a concentration of 0 029
<br /> ppm The.presence of MTBE was not confirmed with EPA'methal`824-0"'d'ue:,to expired sample
<br /> .holding time. Analytical results of.soil samples"are sun nrriarized.in Table 1 T.he laboratory report' ; .
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<br /> L 5', (Castle Reference No. 943)-and chain of custody form:are included_in Appendix B
<br /> 4.3.'-: WELL SURVEY
<br /> municipal-wells' gperated;by-the City.of Stockton or'CalWater are located within 2,000-feet--of --'-
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<br /> the subject property
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<br /> SA.- CONCLUSIONS�r AND RECOMMENDATIIONS ;_ rs r
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<br /> 5.1. CONCLUSIONS
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<br /> Based upon data collected from the site,-the following conclusions are presented {
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<br /> Similart�. the previous analytical'i'esults on.1.low'concentratrons-of hydfocarbons_were %
<br /> 'detected in'soil samriple5-collecte_d beneath the fbrrner UST locatibn-
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<br /> The detection_of MTBEriri the 40 foot sample is questionable However, based on the .
<br /> absence of organic vapor and the-hon detection:of TPH g'and BTE&X, the gasoline-plume
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