ARCHIVED REPORTS XR0007624 - Laserfiche WebLink

Home Browse Search

i 1 r F' f Preliminary Investigation and Evaluation Report -September 1997 t Den's Auto Repair 308 South El Dorado Street, Stockton, California ' 1.0. INTRODUCTION In accordance with your request, Advanced GeoEnvironmental, Inc (AGE) has prepared the,_ enclosed Preliminary Investigation and Evaluation Report (PIER) for Den's Auto Repair at 308 South EI Dorado Street in Stockton, California The scope of work included the advancement of four soil probe borings,the installation of three dual-completed ground water monitoring wells and the collection and analysis of soil and ground water samples The site and its surroundings are illustrated on Figure 1 -Location Map Locations of structures and monitoring wells on the site are illustrated on Figure 2 - Site Plan ` The work was performed in-accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board guidelines for- investigation of underground storage tank (UST) sites -2.0. BACKGROUND 21 ' SITE LOCATION The site is Iocated in an commercial/industnal area of south Stockton at the southeast corner of the intersection of South El Dorado Street and East Lafayette Street A single structure is located on the property and is currently occupied by an auto`repair facility 22 UNDERGROUND STORAGE TANK REMOVAL On 25 and 26 May 1995, four USTs and associated piping were removed from the site by Valley Environmental Solutions(VES)of Stockton, California One 8,000-gallon regular gasoline UST,one 7,000-gallon gasoline UST and one 5,000-gallon gasoline UST were 'removed from a large excavation located north of the building, a single 500-gallon waste oil UST was removed from an excavation located on the south side of the building Upon reffioval of the USTs, soil samples were - collected from beneath each UST, dispenser area, piping areas and from excavated soil Total petroleum hydrocarbons quantified as gasoline (TPH-g)'were detected in the soil samples at concentrations as high as 9,100 part per million(ppm)in sample TK3-N,collected from the northern boundary of the property Table i summarizes the soil sample results ' Based upon the results of the UST sampling, the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) the local oversight agency for UST-release • investigations has required additional investigation of the site to determine the lateral and vertical Advanced GeoEnvironmental,Inc i 4