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i • RECEIVED _ 0 2016 APPENDIX Site Background Information ENVIRONMENTAL "-^OTFi DEPARTMENT Save-On Gas, 420 West Yosemite Avenue, Manteca, California 1.0. BACKGROUND The Save-On Gas (formerly Rainwater Car Wash) site is located at 420 West Yosemite Avenue,at the southeast corner of Yosemite Avenue and Jessie Street in a topographically flat area at an elevation between 30 and 35 feet above mean sea level in Manteca, San Joaquin County, California. The site is within the northeast quarter of Section 5, Township 2 South, Range 7 East, Mount Diablo Base and Meridian(Manteca Quadrangle,7.5-Minute USGS Topographic Series, 1952, photo revised 1987). The site is located at the southeast corner of Yosemite Avenue and Jessie Street in Manteca, California (Figure 1). The site is in a topographically flat area at an approximate elevation of 30 to 35 feet above mean sea level, within the northeast quarter of Section 5, Township 2 South, Range 7 East, Mount Diablo Base and Meridian. (Manteca Quadrangle, 7.5-Minute USGS Topographic Series, 1952, photorevised 1987).The San Joaquin County Tax Assessor's Office lists the property as Parcel 06, Map 312, Book 219 (APN 219-312- 06). 2.0 SITE DESCRIPTION The site currently comprises of a one-story building structure (mini-mart), one 15,000- gallon split-compartment petroleum UST and four fuel dispensers encompassed by an overhead canopy. The UST is located on the east section of the site. A granular activated carbon (GAC)-based groundwater remediation system is located in the southeast corner of the property.The GAC groundwater remediation system consists of a process pump and four 2,000-pound GAC media vessels. 3.0. UNDERGROUND STORAGE TANK REMOVAL One 10,000-gallon UST,one 6,000-gallon UST and one 4,000-gallon gasoline UST were formerly located on a west section of the property; a car wash was formerly located on a south section of the property. In December 1998, the three gasoline USTs (UST Nos. 1, 2 and 3) and associated dispensers/product piping were removed from the site. Upon removal, soil samples were collected beneath the former USTs and beneath the former product piping areas. Total petroleum hydrocarbons quantified as gasoline (TPH-g) were detected in soil samples collected beneath the east ends of the USTs at concentrations as high as 2,600 milligrams per kilogram (mg/kg); in soil samples collected beneath the west ends of the USTs at concentrations as high as 25 mg/kg; and in soil samples collected beneath product piping at concentrations as high as 8,000 mg/kg. Advanced GeoEnviron mental,Inc.