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s B R O W N A N D C A L D W E L L September 13, 1994 Mr Chuck Carmel ARCO Products Company 2000 Alameda de las Pulgas Post Office Box 5811 San Mateo, California 94403 017-1506-0111 Subject Soil Vapor Extraction and Air Sparge Well Installation at ARCO Station 2133, Located at 2908 West Benjamin Holt Drive, Stockton, California, Site Code 1020 Dear Mr Carmel ARCO Products Company (ARCO) authorized Brown and Caldwell (BC) to conduct the drilling and installation of two dual completion soil vapor extraction (SVE)/air sparge (AS) wells, three single completion SVE wells, and one single completion AS well at ARCO Station 2133 located at 2908 West Benjamin Holt Drive, Stockton, California The work was authorized by Task Order 2133-94-4A A work plan (dated July 18, 1994) and well permit application was submitted to and approved by the San Joaquin County Public Health Services, Environmental Health Division A copy of the work plan and approved permit are included with this report as Appendix A BC personnel supervised the installation of the wells which was conducted during the week of August 15, 1994 Turner Explorations of Rancho Cordova, California performed the drilling The well installation was conducted in accordance with the July 18, 1994 work plan The locations of the wells are presented on Figure 1 All of the SNE and AS wells will be connected to the remediation system which is currently under construction Table 1 presents a summary of the soil sample analytical results A complete laboratory report is included with this report as Appendix B As requested by the County, additional soil samples (from the number indicated in the work plan) were collected The additional samples were collected from depths of approximately 16 and 21 feet from boreholes V-8 and V-11, and approximately 21 feet from boreholes V-12 and S-9 The analytical results of the soil sampling indicate that benzene, toluene, ethylbenzene, and xylenes (BTEX) constituents were identified in some of the soil samples in minor concentrations Groundwater was encountered at a depth of 17-18 feet below groundsurface during drilling Of the samples collected from below the groundwater table (approximately 2-3 feet below the groundwater table), BTEX constituents were identified slightly above laboratory detection limits only in the sample collected from borehole V-12 Total petroleum hydrocarbons (TPH) were identified above 0W13/W\EU 5061C0RRESP51506.01 L 2 Enviranrnenlal Engineering And Consulting Analytical Seances QhtS•P5310 9616 1\1ICRO` AtiF,UE P o BOX13449 S %CR %\1ENTo CA 9)813 3449 (916) 444 0123 FAX (916) 8)6 3277