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w■/ Preliminary Phase II Site Assessment Work Plan TAPIA'S ROOFING 3507 Stevenson Avenue, Stockton, California 1.0. INTRODUCTION At the request of Mr. Bob Riggs, representing the subject property owners, Mr. and Mrs. Emet and Maria Tapia, and the potential purchaser of the property,Mr. Ed Hughes of Stockton Tree Service, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Preliminary Phase II Site Assessment Work Plan for the property at 3507 Stevenson Avenue, Stockton, California(the site). The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. This work plan is prepared in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) requirements for the procurement of a boring permit. The purpose of this site assessment is to evaluate subsurface conditions in the area of the former underground storage tank(UST)and to investigate possible presence of shallow disposal well on the property. This work plan details procedures to be used to advance soil probe borings and collect and analyze soil and/or groundwater samples. 2.0. BACKGROUND The site is located at 3507 Stevenson Avenue, approximately 500 feet east of the intersection of Stevenson Avenue and Newton Road,Stockton,San Joaquin County,California(Figure 1).The site is within the southwest quarter of Section 52,Township 2 North, Range 7 East,Mount Diablo Base and Meridian (Stockton West Quadrangle, 7.5-Minute USGS Topographic Series, 1987). 2.1. SITE DESCRIPTION The property is currently utilized as Tapia's Roofing. The site is occupied by a one-story shop , an abandoned domestic well, a new domestic well and,possibly by and abandoned dry well. The site is bordered on the south by commercial property, and by residential property north, west and east. The site formerly was operated as an auto repair facility with one fuel UST and fuel dispenser. The former UST consisted of one 1,000-gallon gasoline tank. 2.2. UNDERGROUND STORAGE TANK REMOVAL AGE reviewed available reports for previous investigations conducted at the site. A brief summary of previous investigation findings is presented below. On 13 May 1993,a 1,000-gallon gasoline UST was removed from the site.According to hand-drawn Advanced GeoEnvironmental,Inc.