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' Preliminary Investigation and Evaluation Report • R.M.B. GARAGE (ERARDI VENTURES) ' 715 North Hunter Street, Stockton, California ' 1 0. INTRODUCTION In accordance with the request of Vince Erardi of R M B Garage (Erardi Ventures), Advanced GeoEnvironmental, Inc (AGE) has prepared this preliminary investigation and evaluation report (PIER) for 715 North Hunter Street (the site), Stockton, California The scope of work included ' advancement of four soil probe borings and the collection and analysis of soil and ground water samples The location of the site and its surroundings are illustrated on Figure 1 Major features and soil boring locations on the site are illustrated on Figure 2 ' This investigation was performed in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board(CVRWQCB) for the investigation of underground storage ' tank (UST) sites I2.0. BACKGROUND The site is located on the northwest corner of Park Street and North Hunter Street in a • commercial/residential area of Stockton, California (Figure 1) Based on historical research of the area, the site began dispensing fuel in the 1930's or 1940's and ceased prior to 1986 The site operated as a car dealership until approximately 1987, since 1987 the site has operated as an auto service repair shop 2 1 UNDERGROUND STORAGE TANK REMOVAL ' On 12 April 2001, one 500-gallon waste-oil UST (Tl) and two 500-gallon fuel USTs (T2 and T3) were removed from beneath the sidewalk adjacent to 715 North Hunter Street, Stockton,California The USTs were removed under PHS-EHD permit by Stockton Service Station Equipment Company, Inc The approximate location of the former USTs is shown on Figure 2 During the UST removals,one soil sample was collected beneath each of the USTs(T 1-W,T2-E and T3-E) and one soil sample each was collected 2 5-feet beneath the former locations of two fuel dispensers and one waste-oil fill port(D1-2 5',D2-2 5'and WO-1) Additionally,two samples were collected from stockpiled soil removed from the excavation (SP 1-W and SPI-E) Petroleum hydrocarbons were detected in each soil sample collected Total petroleum hydrocarbons as gasoline (TPH-g) was detected in the soil samples collected beneath the USTs and fuel dispensers at concentrations as high as 4,300 milligrams per kilogram (mg/kg) Total petroleum hydrocarbons as diesel and motor oil (TPH-d and TPH-mo) were detected in samples collected beneath the former waste oil UST and fill port and from the stockpile soil samples at concentrations as high as 1,800 . mg/kg Oil and grease was detected in the soil sample collected beneath the former waste oil UST Advanced GeoEnvironmental,Inc