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i <br /> Mr. Sasson <br /> May 30, 1996 <br /> Page 2 of 2 <br /> or sides of the hole at anytime during the re-excavation process. Eight(8) soil samples were collected and <br /> analyzed by a laboratory which confirmed the readings indicated by the OVM,that no detectable petroleum <br /> hydrocarbons were present in the soil, beneath the former tank location. In accordance with the approved <br /> work plan,no additional soil samples were collected because no petroleum hydrocarbons were detected in <br /> the original eight(8)samples. <br /> After confirming, through laboratory analysis, that the soil did not contain detectable concentrations of <br /> petroleum hydrocarbons, the excavation was backfilled with clean soil. Since there was no stockpiled <br /> contaminated soil,no samples could be submitted to a laboratory for chemical analysis. <br /> Samples of soil collected in 1993, from the same locations as the samples collected in late 1995 by BBL, <br /> --contained detectable-concentratiotis'of petroleum'hydrocarbons. However;the concentrations were low and { <br /> there were no obvious signs of petroleum contamination, as indicated by the county inspector's report. It <br /> is probable that since the concentrations were low, and the area had been subjected to excavation and the <br /> subsequent introduction of ambient oxygen, that natural biodegradation has occurred. The fact that no <br /> petroleum hydrocarbons were present at the time of the second sampling also indicates that the extent of <br /> contamination was very minor. <br /> Given the extensive efforts put forth by BBL to find petroleum contamination,and finding none,it is BBL's <br /> opinion that what little petroleum hydrocarbons were present in the soil in 1993 have been biodegraded. We <br /> recommend that the San Joaquin County Environmental Health Division close the case on this site. <br /> Please call me if you have any questions or concerns. <br /> Sincerely, <br /> I <br /> BLASLA OUC &LEE,INC. <br /> Jose h . Como,P.E. Vito S/p�, <br /> - _ <br /> As ciate Engineer- ���. EQ� Crn <br /> W <br /> No.3 <br /> « EXP. <br /> cc: Mark Hanf st civo- ♦Q' <br /> �lEOF CAI.# <br /> 82961252. <br /> BLASLAND, BOLICK & LEE, INC. <br /> engineers & scientists <br />