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i <br /> JJ <br /> KAPREALIAN ENGINEERING <br /> N C O R P O R A T E D <br /> KEI-P88-1013 .QR2 <br /> December 10 , 1992 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 00-Pt <br /> P.O. Box 5155San 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 KEIIs 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 July through September <br /> r <br /> of 1992 . <br /> BACKGROUND <br /> The subject site formerly contained a Unocal service station <br /> facility and presently contains an office building. Five monitor- <br /> ing wells (four on-site, and one off-site) currently exist at and <br /> 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 /> The five wells (MW6 and MW10 through KW13 ) wereiionitored and <br /> sampled once during the quarter, except for well MW6 , which was not <br /> sampled because it was dry. Prior to sampling, the wells were <br /> checked for depth to water and the presence of free product and <br /> sheen. ✓No free product or sheen was noted in any of the wells <br /> during the quarter. The monitoring data collected this quarter are <br /> lie summarized in Table 1. <br /> 2401 Stanwell Drive Suite 400 <br /> Concord California 94520 <br /> TE 1 510 602 5100 Fax 510 687 0602 <br />