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sm on <br /> 1433 North Market Boulevard • Sacramento California 95834-1943 • (916)928-3300 • Fax(916)928-3341 <br /> • July 23, 1996 <br /> Project 0805-140 03 <br /> Mr Kyle Christie <br /> ARCO Products Company <br /> P O Box 612530 <br /> San Jose, California 95161 <br /> Re Workplan Associated with the Removal of the Underground Storage Tanks and <br /> Product Delivery Lines, the Abandonment of One Monitoring Well, and the <br /> Installation of One Vapor Extraction Well for ARCO Service Station No 548, <br /> Located at 1612 Hammer Lane, Stockton, California <br /> Dear Mr Christie <br /> At the request of ARCO Products Company (ARCO), EMCON has prepared this <br /> workplan associated with the removal of the underground storage tanks (USTs) and <br /> product delivery lines, the abandonment of one monitoring well, and the installation of one <br /> dual completion vapor extraction well Ttus workplan supersedes the previous workplans <br /> . dated October 5 and November 14, 1995, regarding UST removal It is EMCON's <br /> understanding that ARCO intends to divest the property due to eminent domain <br /> proceedings associated with the widening of Hammer Lane Therefore, the tanks will not <br /> be replaced This document summarizes work performed to date and presents proposed <br /> tasks associated with the tank removal, well abandonment, and well installation at the <br /> subject site (see Figure 1) <br /> BACKGROUND <br /> From December 1990 through November 1993, RESNA Industries, Inc (RESNA <br /> [formerly Applied GeoSysteins]) of Rancho Cordova, California, observed the drilling of <br /> 21 borings (B-1 through B-21), and the installation of five on-site groundwater monitoring <br /> wells (MW-I through MW-5), one off-site groundwater monitoring well (MW-6), and four <br /> vapor extraction wells (VW-1 through VW-4) (RESNA, June 26, 1992, Report <br /> No 30004-4, RESNA, June 21, 1993, Report No 30004-8, and RESNA, May 11, 1994, <br /> Report No 30004-8) The locations of soil borings, wells, and other site features are <br /> presented on Figure 2 Residual hydrocarbons were analytically identified in soil samples <br /> collected from the borings near the tank cavity Low concentrations of hydrocarbons were <br /> detected in soil samples collected from the borings near the dispenser islands <br /> During drilling of soil boring B-18, a product line was accidentally fractured and product <br /> • leaked into the adjacent soil RESNA collected a soil sample from 6 feet below the product <br /> SA(-%N\PJ(3\080514)805I400 3D5 94 I-s i <br />