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fmcon <br /> 1433 North Market Boulevard • Sacramento Colifornra 95834-1943 • (916)928-3300 • Fax(916)928- 1 <br /> ]jam <br /> July 28, 1995 ✓�� �4f <br /> Project 08Q$- 0'2 <br /> ' 7995 <br /> Mr Kyle Christie <br /> ARCO Products Company ��cFs�Tly <br /> 2155 South Bascom, Suite 202 <br /> Campbell, California 95008 <br /> Re Second Quarter 1995 Status Report for ARCO Service Station No 0548 at <br /> 1612 Hammer Lane, Stockton, California <br /> Dear Mr Christie <br /> At the request of ARCO Products Company (ARCO), EMCON is conducting an <br /> environmental investigation at the subject site (see Figure 1) We have preparedthis status <br /> report on the work conducted during the second quarter 1995, which included measuring <br /> depth to groundwater, collecting groundwater samples from the wells for subjective and <br /> laboratory analyses, and calculating the groundwater gradient and direction of groundwater <br /> flow beneath the site <br /> BACKGROUND <br /> From December 1990 through November 1993, RESNA Industries ([RESNA] formerly <br /> Applied GeoSystems) observed the drilling of 21 borings (B-1 through B-21) and the <br /> installation of five on-site groundwater monitoring wells (MW-1 through MW-5), one off- <br /> site groundwater monitoring well (MW-6), and four vapor extraction wells (VW-1 <br /> through VW-4) (RESNA, June 26, 1992, Report 30004-4, RESNA, June 21, 1993, <br /> Report 30004-8, and RESNA, May 11, 1994, Report 30004-8) The locations of soil <br /> borings, wells, and other site features are presented on Figure 2 Residual hydrocarbons <br /> were analytically identified in soil samples collected from the borings near the tank cavity <br /> Low concentrations of hydrocarbons were detected in soil samples collected from borings <br /> near the dispenser islands <br /> During drilling of soil boring B-18, a product line was accidentally fractured and product <br /> leaked into adjacent soil RESNA collected a soil sample from 6 feet below the product <br /> line (S-6-PL1), gasoline hydrocarbons were detected in this sample. RESNA installed one <br /> vapor extraction well (VW-4) near the product release Total petroleum hydrocarbons as <br /> gasoline (TPHG), and benzene, toluene, ethylbenzene, and total xylenes (BTEX) were <br /> below laboratory detection h ruts in soil collected at 11 feet, 26 feet, and 46 feet below <br /> ground surface (bgs) <br /> SAC1N\PIM05108051400 2BS-94\fw 4 <br />