SITE INFORMATION AND CORRESPONDENCE

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UZ Q** Emcon C (_1 1433 North Market Boulevard•Sacramento.California 95834-1943 • (916)928-3300• Fax(916)928-3341 January 23, 1996 Project 0805-159.01 Mr. Kyle Christie ARCO Products Company P.O.Box 612530 San Jose,California 95161 Re: Limited Subsurface Investigation Report for ARCO Products Company Service Station No: 5569 Located at 3518 East Hammer Lane, Stockton, California Dear Mr.Christie: At the request of ARCO Products Company (ARCO), EMCON conducted an environmental sampling investigation associated with the removal and replacement of the product lines at the subject site (see Figure 1). Based on information provided by ARCO, the fibertrench/sump system may have been incorrectly installed. Although an unauthorized release had not occurred, ARCO initiated the replacement of the single wall product lines and the fibertrench system with double wall fiberglass product lines. During the replacement of the product lines, EMCON collected soil samples beneath the product lines and fibertrench system. PRODUCT LINE REPLACEMENT AND SAMPLING American Construction & Environmental Services, Inc., of Livermore, California, was contracted by ARCO to conduct product line removal and replacement activities. EMCON was contracted by ARCO to conduct an environmental sampling investigation associated with the product line removal and replacement activities. EMCON's field work was conducted in accordance with the Tri-Regional Guidelines and EMCON Feld Procedures. A copy of EMCON's Field Procedures are presented in Appendix A. A site safety plan(Plan No. 0805-159.01) was prepared and a copy of the safety plan was on site during the field activities. On October 20, 1995, an EMCON geologist was on site to collect soil samples beneath the product line trenches. A representative of San Joaquin County Public Health Services (SJCPHS) was also on site. Soil samples were collected every 20 linear feet beneath the former product lines or at product line angle joints. Samples were collected at approximately 4 to 5.5 feet below ground surface(bgs) (approximately 2 to 3.5 feet below the former product lines and fibertrench system). Nine soil samples were collected from the trenches under the direction of the SJCPHS representative. The location of soil samples are shown on Figure 2. Soil encountered in the trenches consisted of brown silty clay to clay. The product lines and the fibertrench system appeared to be in good condition. No visible holes or cracks SACW-.IPJ OMS108051590.1 B S A4Nd=2