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n <br /> KAPRfALIAN ENGINEERING � r� ,'�F�` , ln,-AL„ I t ��j <br /> I N C O R P O F3 A T E D <br /> KEI-P9i,tZ202-(MfQR <br /> October 27, 199 <br /> 18 <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: Semi-Annual Report <br /> Unocal Service Station #6015 <br /> 601 E. Kettleman Lane <br /> Lodi, 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) . The wells <br /> are currently monitored quarterly and sampled semi-annually. This <br /> report covers the work performed by KEI from April through <br /> September 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 KEIIIs 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 twice <br /> 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 /> checked for the presence of a sheen. No free product or sheen was <br /> noted in any of the wells during the semi-annual period. The <br /> monitoring data collected In this semi-annual period are summarized <br /> in Table 1 . <br /> 2401 Stanwell Drive,Suite 400 <br /> Concord,California 94520 <br /> Tel 510 602 5100 Fax 510 687 0602 <br />