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1 � Closure Summary Report MANTECA CITY CORPORATION YARD 210 East Wetmore Street,Manteca, California 1.0. INTRODUCTION In accordance with the request of Mr. Frederic Clark of the City of Manteca, Advanced GeoEnvironmental,Inc. (AGE)has prepared this Closure Summary Report(CSR)summarizing all field activities conducted at 210 East Wetmore Street,Manteca,California(the site).Based upon the results of site investigations and the mitigation of the former underground storage tank(UST) area at the site, it is AGE's opinion that a site closure is warranted for this facility. The site setting is illustrated on Figure 1;the layout of the property,including site building structures and the locations of the former USTs, existing monitoring wells, and soil borings, is depicted on Figure 2. This CSR has been prepared in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines (Tri-Regional Board Staff Recommendations For Preliminary Investigations and Evaluation of Underground Tank Sites) for No Further Action Requests (See Appendix A). 2.0. BACKGROUND The site is located in a commercial/industrial area of South Manteca,California,at an approximate elevation of 35 feet above mean sea level (MSL). Thee site is presently occupied by the City of Manteca Corporation Yard.Currently the site operates above-ground fuel storage tanks(ASTs)that have been installed over the former UST pit location. There are no other apparent source areas for the identified contaminants on the site. 2.1. UST REMOVAL One 10,000-gallon diesel UST (TK1), one 10,000-gallon leaded gasoline UST (TK2), and one 10,000-gallon unleaded gasoline UST(TK3)were removed from the site on 05 August 1999. Two soil samples were collected from beneath each UST and eight samples were collected from the soil stockpile.Methyl tertiary-butyl ether(MTBE)was detected in three of the six soil samples collected beneath the USTs, at concentrations as high as 0.32 milligrams per kilogram (mg/kg). Petroleum hydrocarbons and other fuel oxygenates were not detected in samples collected beneath the USTs. Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel(TPH-d)were detected in stockpile samples, at concentrations as high as 4.8 mg/kg and 40 mg/kg, respectively. ASTs and a concrete pad have subsequently been installed over the former USTs location. Analytical results of soil samples collected from the UST removal can be found in Table 1. Advanced CeoEnvironmental,Inc.