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KAPREALIAN ENGINEERING <br /> I N C 0 R P 0 R A T E 0 <br /> KEI-P88-1013 .QR4 <br /> April 19 , 1993 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P.O. Box 5155 <br /> San Ramon, California 94583 <br /> Attention: Mr. Ron Bock <br /> RE: Quarterly Report <br /> Former Unocal Service Station #5098 <br /> 5606 Pacific Avenue <br /> Stockton, California <br /> Dear Mr. Bock: <br /> This report presents the results of the most recent quarter of <br /> monitoring and sampling of the monitoring wells at the referenced <br /> site by Kaprealian Engineering, Inc. (KEI) , per KEI ' s proposal <br /> (KEI-P88--1013 .P2) dated August 23 , 1991, and as modified in KEI ' s <br /> report (KEI-P88-1013 .R2) dated July 15, 1992 . The wells are <br /> • currently monitored monthly and sampled on a quarterly basis. This <br /> report covers the work performed by KEI from January through March <br /> of 1993 . <br /> BACKGROUND <br /> The sub3ect site formerly contained a Unocal service station <br /> facility and presently contains an office building. Extensive <br /> excavation of contaminated soil was performed at the site in 1988 . <br /> Five monitoring wells (four on-site, and one off-site) currently <br /> exist at and in the vicinity of 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 report (KEI- <br /> P88-1013 .R2) dated July 15, 1992 . <br /> RECENT FIELD ACTIVITIES <br /> Four of the five existing monitoring wells (MW10 through MW13) were <br /> monitored three times and were sampled once during the quarter. <br /> Well MW6 was not monitored or sampled because the well has been dry <br /> for the past three quarters. During monitoring, the wells were <br /> checked for depth to water and the presence of free product. Prior <br />. to sampling, the wells were also checked for the presence of sheen. <br /> No free product or sheen was noted in any of the wells during the <br /> 2401 Scannell Drive SUi[L 400 <br /> Concord California 94520 <br /> TL 1510 602 5100 Fax 510 687 0602 <br />