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A S S O C I A T E S I N C <br /> Summary Report of <br /> ation <br /> Additional Subsurface Investigation <br />� g <br /> N& S Irrigation <br /> 215 West Main Street <br /> Ripon, California <br /> ATC Project No. 14981.0001 <br /> 1.0 INTRODUCTION <br /> This report summarizes procedures and practices utilized by ATC Associates Inc. to investigate <br /> impacted soil and groundwater associated with the former underground storage tanks (USTs) <br /> located at 215 West Main Street, Ripon, California. The investigation consisted of drilling four <br /> soil borings and collecting soil and groundwater samples for analysis. <br /> 1_1 Site Location <br /> The site is located on the north side of West Main Street and the east side of Locust Avenue in <br /> Ripon, California, as shown on Figure 1. The location is a residential and commercial area. The <br /> site is currently occupied by N& S Irrigation. <br /> 1.2 . Site Background and Previous Work <br /> In March 1990, one 1,500-gallon unleaded gasoline UST, one unleaded gasoline UST of <br /> unknown size, and all associated piping and dispensing equipment were removed and transported <br /> off-site. Laboratory analysis of soil samples collected from beneath the former 1,500-gallon UST <br /> location indicated the presence of detectable concentrations total petroleum hydrocarbons. j <br /> Discoloration of the soil and a petroleum hydrocarbon odor were noted in the field. Aft er the <br /> tanks were removed, the area of the former tanks was backfilled. Former tank locations are <br /> shown on Figure 2. <br /> On November 14, 1997, aeolo ist from ATC Associates supervised the advancement of two <br /> g g <br /> soil borings to 30 feet below ground surface (bgs). A site plan showing soil boring locations is <br /> included as Figure 2. Soil samples were collected at five-foot intervals and grab groundwater { <br /> samples were collected from each boring. Samples were analyzed for petroleum hydrocarbons <br /> and elevated concentrations of petroleum hydrocarbons were detected in soil and groundwater <br /> samples. <br /> 2.0 METHOD AND PROCEDURES <br /> All work described herein was performed in accordance with ATC's Workplan for Additional <br /> Subsurface Investigation, dated April 30, 1998, which was approved with minor modifications by <br /> I <br /> wA1 498 1\1 498 1\reports\psii.doc 1 <br />