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Additional Site Assessment Work Plan STALLWORTH AUTO SALES 602 North California Street, Stockton , California f 1 .0 . INTRODUCTION At the request of Mr. Gary Stallworth of Stallworth Auto Sales , Advanced GeoEnvironmental , Inc . (AGE) has prepared this Additional Site Assessment Work Plan for the property located at 602 North California Street, Stockton , California (site) . The scope of work includes advancement of three (3) soil probe borings for the collection of groundwater samples to define the down-gradient lateral extent of petroleum hydrocarbon-impacted groundwater between 60 and 70 feet below surface grade (bsg ) . The work plan provides a description of the scope of work and procedures to be used for soil boring advancement, groundwater sample collection and analysis ; and boring abandonment . The site and surrounding area are illustrated in Figure 1 . On-site structures and monitoring well locations are illustrated in Figure 2 and an expanded site plan depicting the surrounding area and proposed boring locations is presented in Figure 3 . Site background information is summarized in Appendix A. Additionally , groundwater elevation maps depicting shallow- (20 to 50 feet bsg ) and intermediate-zone (60 to 70 feet bsg) groundwater flow direction and gradient are presented in Figures 4 and 5 , respectively; and maps illustrating the current estimated distribution of dissolved total petroleum hydrocarbons as gasoline (TPH -g ) and diesel (TPH-d ) , benzene , toluene , ethylbenzene , xylenes ( BTEX) and 1 , 2-dichloroethane ( 1 , 2- DCA) are presented in Figures 6 and 7 , respectively . Groundwater elevations , analytical results of groundwater samples , and analytical results of grab groundwater samples are included in Tables 1 through 3 , respectively . The work plan was prepared as directed by San Joaquin County Environmental Health Department (SJCEHD) letter, dated 26 November 2013 (Appendix B) , and in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board (CVRWQCB) for investigation of underground storage tank ( UST) sites . 2 .0 . SCOPE OF WORK Based on data collected during previous investigations and quarterly groundwater monitoring and sampling at the site , the SJCEHD has directed the preparation of a work plan to complete the down-gradient lateral assessment of petroleum hydrocarbon- impacted groundwater. AGE proposes to advance three soil borings in the down- gradient direction from the site , to depths of 70 feet bsg , to define the lateral extent of petroleum hydrocarbon-impacted groundwater in the intermediate zone (60 to 70 feet bsg ) . Advancer/ GeoEnvironmental Inc .