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e <br /> RE33CEIVED <br /> MAY <br /> �j G q <br /> I(NP RCE OL IR P O A ENGINEERING TE D 1 A f 2 `T 1993 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> KEI-P91-0202 .QR4 <br /> April 13 , 1993 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> F.O. Box 5155 <br /> San Ramon, California 94583 <br /> Attention: Mr. David DeWitt <br /> RE: Semi-Annual Report <br /> Unocal Service Station #6015 <br /> 601 E. Kettleman Lane <br /> Lodz California <br /> Dear Mr. DeWitt. <br /> This report presents the results of the most recent semi.-annual <br /> period of monitoring and sampling of the monitoring wells at the <br /> referenced site by Kaprealian Engineering, Inc. (KEI) , per KEI ' s <br /> proposal (KEI-P91-0202 . P3) dated October 16 , 1991 , as modified in <br /> KEI ' s report (KEI-P91-0202 .R6) dated January 23 , 1992 , and as <br /> further modified in KEI ' s quarterly report (KEI-P91-0202 .QR3) dated <br /> November 6, 1992 . The wells are currently monitored quarterly and <br /> sampled semi-annually. This report covers the work performed by <br /> KEI from November of 1992 through March of 1993 . <br /> BACKGROUND <br /> The subject site contains a Unocal service station facility. Three <br /> underground fuel storage tanks, one waste oil tank, and the product <br /> piping were removed from the site in February of 1991 during tank <br /> replacement activities . The fuel tank pit was subsequently <br /> overexcavated in order to remove contaminated soil. Nine monitor- <br /> ing wells have been installed and two exploratory borings have been <br /> drilled at the site. <br /> A site description, detailed background information including a <br /> summary of all of the soil and ground water subsurface investiga- <br /> tion/remediation work conducted to date, site hydrogeologic <br /> conditions, and tables that summarize all of the soil and ground <br /> water sample analytical results are presented in KEI ' s quarterly <br /> report (KEI-P91-0202 .QR1) dated May 4 , 1992 . <br /> RECENT FIELD ACTIVITIES <br /> The nine monitoring wells (MW1 through MW9) were monitored four <br /> times and were sampled once during the semi-annual period. During <br /> monitoring, the wells were checked for depth to water and the <br /> presence of free product. Prior to sampling, the wells were also <br /> 2401 Stanwell Drl',L tiUHL 400 <br /> Concord CAfornw 94520 <br /> Tt 1510 602 5100 Fxx 510 687 0002 <br />