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Mr. Pat Riddle <br /> Page 3 <br /> In boring HAB19-02-9 ' , which was located at the south end of the former UST excavation, <br /> TPHg was detected at a very low level of 10 ppm and lead was reported at 17 ppm. Of the <br /> VOCs , only trace levels of naphthalene (0.0023 ppm) , 1 ,2 ,4-trimethylbenzene (0 .0073 ppm) , <br /> 1 ,3 ,5 - trimethylbenzene (0 . 0058 ppm) and xylenes (0 . 0085 ppm) were detected. <br /> Conclusion <br /> Soil sampling beneath the location of the former UST detected only de-minimus <br /> concentrations of gasoline and certain gasoline component compounds . Lead is present at <br /> naturally-occurring background levels . These detections are not indicative of a significant fuel <br /> leak. <br /> Recommendation <br /> No further investigation would appear to be necessary and we recommend that San Joaquin <br /> County EHD consider the UST to have been properly closed. <br /> If you have any questions or comments please contact Ground Zero at your convenience . <br /> Respectfully, <br /> Ground ro Analysi Inc. NAL <br /> o <br /> a GREGORY P. <br /> STAHL <br /> Gregory P . Stahl , PG No . 5023 * No. 5023 <br /> CA Certified Hydrogeologist No . 264 <br /> lF OF Cpl\`c�� <br /> Attachments <br /> Figure 1 : Site Location Map <br /> Figure 2 : Site Map with Soil Sampling Locations <br /> Table 1 : Soil Sample Analytical Results <br /> Att. A: Soil Boring Permit <br /> Att. B : Field Notes <br /> Att. C : Laboratory Report <br /> cc : Ms . Margo Bentz-lvers <br /> San Joaquin County EHD <br /> UST Soil Sampling Report <br />