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May 18 , 1992 <br /> 19 0 6 0, 0 2 5 . 0 3 Harding Lawson Associates <br /> Mr. Bud Good <br /> The Southland Corporation <br /> i Page 3 <br /> } have risen relative to previous periodic measurements. Our <br /> calculations indicate a northeasterly hydraulic gradient, which <br /> }� is consistent with previous data for the site. <br /> 1 <br /> RESULTS AND DISCUSSION <br /> I <br /> -., The pH of purged groundwater monitored in the field was <br /> consistently between 7 . 43 and 8 . 47 . Conductivity measurements <br /> ranged from 700 to 2 , 800 ms/cm. Results of groundwater analyses <br /> indicate increasing concentrations of benzene and total <br /> petroleum hydrocarbons in MW-10 from the previous quarter. <br /> Furthermore, toluene and total xylenes (1. 1 parts per billion <br /> [ppbj ) and 1. 2 ppb, respectively) were detected in groundwater <br /> from MW-5 for the first time. Petroleum hydrocarbon <br /> concentrations in groundwater from MW-1 and MW-8 appear to have <br /> stabilized, while MW--9 results indicate decreasing <br /> i concentrations of benzene and total petroleum hydrocarbons. All <br /> j of the remaining wells had nondetectable concentrations of <br /> petroleum hydrocarbons. The "non-detection line" of the TPH <br /> results is shown in Plate 1. Detectable levels of fecal <br /> coliform were found in groundwater samples from MW-8 and MW-11. <br /> We recommend that you transmit a copy of this document to the <br /> SJCDPHS. If you require additional information, please call. <br /> Yours very truly, <br /> HARDING LAWSON ASSOCIATES <br /> A,4 <br /> Steven B. Hansen ,RQ,Qf ESSIO <br /> Staff Engineer �o �� J,OSB ql�� <br /> G No. 656Uj <br /> m . <br /> Exp. 3/31/95 a <br /> 4ep n J. Osborne <br /> Geot hn cal Engineer rql arECHN� Q�`P <br /> 4 F 0 CA <br /> SBH/SJO/pkp 031881T/R52 <br /> #� Attachment: Tables 1 and 2 <br /> # Plate 1 <br /> ' Appendix <br /> i <br />