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////7APEX N` r 5-CC 21, ,s° I l 52 N V I R 0 T E C H INC , 7844 Madison Avenue,Suite 106 • Fair Oaks,to 95628 1.800.242.5249 • Ph.916.535.0200 • Fax 916,535.0207 May 2, 1995 Mr. Jack Colberg Colberg Boat Works P.O. Box 1288 Stockton, California 95201 Subject: Workplan for Limited Subsurface Investigation t Colberg Boat Works 401 North Stockton, Stockton, California Dear Mr. Colberg: Apex Envirotech, Inc. (Apex), is pleased to provide .Colberg Boat Works this work-plan for a limited subsurface investigation at the subject site (Figures 1 and 2). The proposed investigation includes drilling six on-site soil borings and completing them as groundwater monitoring wells (Figure.3). The purpose of the investigation is to assess the lateral and vertical extent of petroleum hydrocarbons that may or may not be present in the shallow soil and groundwater at the site. PREVIOUS WORK On May 16, 1986, Jim Thorpe Oil, Inc. Removed two 550-gallon diesel, one 8,000 gallon diesel and one 1,000 gallon gasoline underground storage tanks (UST) from the site. The area around the gasoline UT was overexcavated in 1988. In February 1993, Telic Engineering Corporation {TEC) of Stockton, California, performed a Phase I investigation of the subject site and the surrounding area in a one mile radius. TEC's findings are summarized in their report Phase I Preliminary Hazardous Materials Site Assessment dated July 21, 1993. Apex Envirotech, Inc, supervised the advancement of eleven subsurface probes to collect soil and groundwater samples from the site on December 12 and 13, 1994. Results of the subsurface investigation is summarized in Phase H Site Assessment Report dated January 23, 1995. Areas around the former USTs were discovered to contain petroleum hydrocarbons. PROPOSED INVESTIGATION Apex proposes to drill sit soil borings to approximately 30 feet below surface (bs) and complete them as 2-inch-diameter groundwater monitoring wells (Figure 3). All fieldwork will be conducted in accordance with the Apex standard operating procedures (SOP) included as Atlachment 1. Previous subsurface sampling indicates groundwater ranges from approximately fifteen to twenty feet bs at the site, Based on this information, the six proposed wells will be drilled to a total depth of 30 feet bs and screened from 10 to 30 feet bs.