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I QUARTERLY REPORT April 1996 Marlowe Properties 4648 East Waterloo Road ' Stockton, California 1.0. INTRODUCTION/SCOPE OF WORK In accordance with the request of Mr Jonathan Marlowe of Marlowe Properties, Advanced GeoEnvironmental, Inc (AGE) has performed quarterly ground water monitoring activities at 4648 Waterloo Road, Stockton, California (the site) This report details the monitoring and sampling I procedures performed during April 1996 and presents the results of the laboratory analyses The location of the site is illustrated on Figure 1 - Location Map A plan of the site is illustrated on Figure 2 - Site Plan IThe monitoring and sampling was performed in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Regional Water Quality Control Board (RWQCB) guidelines for the investigation of underground storage tank (UST) sites 2.0. BACKGROUND 21 SITE LOCATION The site is located on the south side of Waterloo Road east of Highway99, in a rural/industrial area of low topographic relief east of Stockton, California (Figure 1) The site is located in Section 53, Township 2 North, Range 7 East, Mount Diablo Base and Meridian (MDB&M) A large warehouse, a small office building, two fenced storage yards and a parking/delivery area are present on the site (Figure 2) 22 UNDERGROUND STORAGE TANK REMOVAL In January 1988, one 550-gallon gasoline underground storage tank (UST) was removed from the site Total petroleum hydrocarbons quantified as gasoline (TPH-g) was detected in soil samples collected beneath the UST The PHS-EHD required additional investigation of the UST area to determine the lateral and vertical extent of hydrocarbon-impacted soil and ground water 23 SITE ASSESSMENT In July 1988 one ground water monitoring well ( W-1) and one soil boring (B-1) were installed southwest of the former UST location TPH-g was detected in soil samples collected from both