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h` l ri <br /> _J -A <br /> KAPREALIAN ENGINEERING <br /> I N C 0 R P 0 R A T E D <br /> November 2 , 1993 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P. O. Box 5155 <br /> San Ramon, California 94583 <br /> Attention: Mr. David DeWitt <br /> RE: Site Investigation Summary <br /> Unocal Service Station x`6015 <br /> 601 E. Kettleman Lane <br /> Lodi California <br /> Dear Mr. DeWitt: <br /> This letter presents a summary of the subsurface investiga- <br /> tion/remediation that has been conducted at the subject site to <br /> date. <br /> SUMMARY OF SOIL SAMPLES <br /> • In February and March of 1991, Kaprealian Engineering, Inc. (KEI) <br /> collected soil samples associated with the removal of underground <br /> fuel storage tanks, a waste oil tank, and product piping at the <br /> subject site. The analytical results of the final soil samples <br /> collected from beneath the underground fuel storage tanks, waste <br /> oil tank, and product piping indicated non-detectable concentra- <br /> tions of total petroleum hydrocarbons (TPH) as gasoline, except for <br /> 6. 1 ppm detected in one sample. <br /> Two exploratory borings and nine ground water monitoring wells have <br /> been installed at the site. A cumulative total of 143 soil samples <br /> were collected at various depths and analyzed during the site <br /> characterization phase. Of these samples, 139 indicated non- <br /> detectable concentrations of TPH as gasoline, and 137 indicated <br /> non-detectable concentrations of benzene. The four samples that <br /> indicated detectable levels of TPH as gasoline had levels ranging <br /> from 1. 9 ppm to 5. 7 ppm, while the six samples that showed <br /> detectable levels of benzene had levels ranging from 0. 0094 ppm to <br /> 1. 9 PPm• The analytical results of all of the soil samples <br /> collected at the site to date are summarized in KEI ' s report (KEI- <br /> P91-0202 . QR1) dated May 4, 1992 . <br /> SUMMARY OF GROUND WATER SAMPLES <br /> Neither free product nor sheen has ever been detected in any of the <br /> wells at the subject site since the inception of ground water <br /> monitoring and sampling on January 3 , 1992 (over one hydrologic <br /> 2401 Sonwell Drive Suite 400 <br /> Concord Ulfor=94520 <br /> Tel 510 602 5100 Fxx 510 687 0602 <br />