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YJ i� <br /> li <br /> LO INTRODUCTION ' <br /> This workplan is submitted as a modification to the workplan submitted by Groundwater <br /> Technology, Inc. dated,lune 1990 concerning additional monitoring well installations at the <br /> subject site. Earth Technology proposes the substitution of CPT installed BATTM probes in <br /> lieu of new groundwater monitoring wells. <br /> 1.1 SITE DESCRIPTION <br /> The site is located on the ccmer of Benjamin Holt Avenue and Plymouth Road in Stockton, <br /> California. It is an active service station that retails regular, unleaded, and super-unleaded <br /> �w- <br /> gasoline. The vicinity map for the site is presented in Figure 1. To the northeast of use site, <br /> across Plymouth Avenue, is the Swenson Park golf course. Behind the site, directly to the <br /> north, are several small businesses. Three other service stations are in the vicinity of the <br /> site. <br /> The former location of the underground storage tanks was on the south side of the site near <br /> Benjamin Holt Avenue. The former waste oil tank was located on the northeast part of the <br /> site. The new location of the underground storage tanks is on the north-central part of the <br /> site as shown on Figure 2. <br /> 1.2 SITE BACKGROUND <br /> The former underground storage tanks and the waste oil tank were removed by Blaine Tech <br /> Services (BTS) of San Jose, California, between 6 and 10 January 1989. Results of the soil <br /> sampling conducted by BTS during, the tank removal were reported to Chevron on <br /> January 17, 1989. Total petroleum hydrocarbons were detected in soils excavated from the <br /> tank pit. Oil and grease were detected in soil excavated from the waste oil pit. <br /> 4.y <br /> 0:ti91503a OM,01u"M 1 <br /> i <br />