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NVIRONMENTAL. SOLUTIONS <br /> E ti F February 19, 1999 <br /> Project 0805-147 007 <br /> 304 <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Weber Ave Third Floor <br /> Ms Carol Oz R O Box 388, Stock n CA 9520?- <br /> Approved 0388 <br /> San Joaquin County Public Health Services Denied � <br /> P OEnvironmentaBox 388 1 Health Division Conditions <br /> Stockton, California 95201-0388 Date <br /> Re Overexcavation and Soil Sampling Workplan Associated with the Removal of <br /> Product Delivery Lines and Dispensers, for ARCO Service Station No 2186, <br /> Located at 3212 North California Street, Stockton, California <br /> Dear Ms Oz <br /> At the request of ARCO Products Company (ARCO), Pinnacle Environmental Solutions, <br /> a division of EMCON (Pinnacle), has prepared this overexcavation and soil sampling <br /> workplan associated with the removal of product delivery lines and dispensers at ARCO <br /> • Service Station No 2186, located at 3212 North California Street, Stockton, California <br /> (see Figure 1) The contractor retained by ARCO will remove the product delivery lines <br /> and dispensers beginning February 1999 This document presents proposed tasks <br /> associated with the removal and replacement of the product delivery lines and dispensers <br /> at the subject site <br /> BACKGROUND <br /> The site is located at the southeast corner of the intersection of Alpine Avenue and North <br /> California Street in Stockton, California Based on information provided by ARCO and <br /> data collected during site investigations, there are three underground storage tanks (USTs) <br /> at the site one 8,000-gallon tank storing super unleaded gasoline, and two 10,000-gallon <br /> tanks storing regular unleaded gasoline The approximate tank locations relative to site <br /> structures are shown on Figure 2 <br /> In August and September 1995, EMCON observed the drilling of six vertical borings (B- <br /> 1, B-3 through B-5, B-7, and B-8) and two 45 degree angle borings (B-2 and B-6) Three <br /> of the borings (B-1, B-4, and B-5)were converted to groundwater monitoring wells (MW- <br /> 1 through MW-3), and three of the borings (B-3, B-7, and B-8) were converted to duel- <br /> completion vapor extraction wells (VW-1 through VW-3) In October 1996, EMCON <br /> observed the drilling of boring B-9 The boring was converted to groundwater monitoring <br /> • well MW-4 <br /> CP\E\ARC012186\REP0RTS12186P101 DOC-9811% 1 <br /> 3939 Cambridge Road,Suite 220 Cameron Park California 95682 (530)676-6884 (530)676-6885 Fax <br />