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C A M B R I A <br /> SITE BACKGROUND <br /> Site Description: The subject site is located on the southwest comer of the intersection of <br /> Pacific Avenue and Porter Avenue in Stockton, California (Figures 1 and 2). The service <br /> station layout consists of three underground gasoline storage tanks, two product islands, and a <br /> station kiosk. Previous investigative activities are documented in the February 28, 1998 <br /> Response Letter/Work Plan prepared by Enviros, Inc. <br /> WORK PLAN <br /> Technical Rationale for Proposed Scope of Work <br /> • Groundwater flow direction has predominantly been to the southeast at this site. <br /> • The lateral extent of hydrocarbons in groundwater at this site has not been defined <br /> downgradient of the site. <br /> • • Cambria proposes installation of four groundwater monitoring wells to assess the <br /> downgradient extent of hydrocarbons and MTBE in groundwater. <br /> • The vertical extent of petroleum hydrocarbons and MTBE has not been delineated <br /> onsite. Previous soil samples collected from borings drilled on site suggest hydrocarbons <br /> may be present beneath the site 70 feet below grade (fbg). <br /> • Cambria proposes drilling two deep soil borings onsite to a minimum depth of 70 fbg to <br /> assess the vertical extent of hydrocarbons in soil and groundwater beneath the site. <br /> Work Tasks <br /> Permits: An appropriate permit for drilling will be obtained from SJCPHS/EHD. Cambria <br /> will obtain access agreements from private property owners for two of the proposed well <br /> locations. Cambria will obtain an encroachment permit from the City of Stockton for the <br /> two wells proposed on Pacific Avenue. <br /> Health and Safety Plan: A site-specific Health and Safety Plan will be prepared for field <br /> • work. <br /> 0854 3 <br />