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L ♦ ' 1 ' ` 1 Preliminary Investigation ation and Evaluation' Report t� , P CHARLIE'S DAY &NITE 706 North El Dorado Street, Stockton, Californias r , IIA. INTRODUCTION M In accordance with the request of Mr. 'Charles 'Skobrak of Charlie's Day & Nite, Advanced GeoEnvironmental, Inc (AGE)has prepared this Preliminary Investigation and Evaluation Report _ for the property located at 706 North EI Dorado Street,`Stockton, California The scope of work included the collection of soil samples beneath the product piping,the advancement of six soil probe ' borings and the collection and analysis of soil and grab water samples The location of the site and the immediately surrounding area are illustrated on Figure 1, structures and soil probe boring locations are illustrated on Figure'2 _ F E ' 2.0. BACKGROUND The site is located on the northeast comer of North El Dorado Street and East Park Street in downtown Stockton, San Joaquin County California One residence was located at the site in '1895, several residences were located at the site in 1917, based' upon Sanborn Maps 'Operation of a gasoline service station began at the site between 1937 and 1950, based upon aerial photographs and ' ' Sanborn Maps The surrounding area is currently commercial and'residential Two 4,000-gallon USTs were removed from the southeastern portion of the site on,10 June 1997 I Reportedly, the USTs had not been in operation sinceatleast 1978 Petroleum hydrocarbons were detected in the sample collected beneath the western end of the southern UST at a concentration of 11,000 ppm Hydrocarbons were not detected in the three remaining samples collected beneath the USTs or,one sample collected beneath "dispenser #V The product piping was not removed'or sampled during the UST removal ' Soil,excavated during the UST removal was stockpiled at the I southeastern corner of 121-123 E Park Street The PHS-EHD subsequently required investigation to determine the extent of impacted soil and`ground water IGround water,flow beneath the site is toward they northeast, based upon data collected from monitoring wells located 200 feet east and IA mile southwest of the subject property t 3.4. PROCEDURES' Field work was performed as proposed iii the approved work plan Site Assessment Work Plan dated 25 March 1998 and prepared by AGE'with San Joaquin 'County Public Health Services - I - Environmental Health-Division(PHS-EHD)amendments and in accordance with the PHS-EHD and (0 Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for the investigation of underground storage tank (UST) sites: " Advanced GeoEnvironmentai,Inc i s