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tli ,ti <br /> I <br /> ENVIRONMENTAL HEALTH DIVISION 1 <br /> 304 E Weber Ave Third Floor a divdWo" ofI I 1119A 9520 <br /> l <br /> ENVIRONMENTAL SOLUTIONS Approved <br /> Denied n _ <br /> Conditions d Pius April 15, 1999 <br /> Iota 17.E 1v S't,TJSe ' -a te Protect 0805-147007 <br /> Date -by. <br /> 'R--" E <br /> Ms Carol Oz <br /> San Joaquin County Public Health Services <br /> APR 16 1999 <br /> Environmental Health Division <br /> P O Bok 388 ENVIRUNivIEWAL HEALTH <br /> Stockton, California 95201-0388 PERMIT / SERVICES <br /> Re Workplan to Further Assess Hydrocarbon-Impacted Soil and Groundwater, at� r <br /> ARCO Service Station No 2186, Located at 3212 North California Street, Stockton, I& <br /> California k,,44 Ovvenwxii <br /> r/4. ';�r� <br /> Dear Ms Oz <br /> Gf�u��td• <br /> At the request of ARCO Products Company (ARCO), Pinnacle Environmental Solutions, <br /> a division of EMCON (Pinnacle), has prepared this workplan in response to your letters (2)9CW4` J <br /> dated May 13, 1998 and February 22, 1999, for the above-referenced site Figure 1 shows 1"�4';t `' <br /> the site location The scope of work proposed herein is to further assess the vertical and IC "`�`� <br /> P P P rv;vi k <br /> lateral hydrocarbon impacts to groundwater at the site Also, as requested, results of a r,',"./c sha, <br /> well survey that was conducted to identify wells located near the site is included as O N,-44 <br /> Appendix B 1I1SI£" <br /> BACKGROUND QG <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 (13-2 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 1ARC0121861REPORT512186P103 DOC-9811sg 1 <br /> 3939 Cambridge Road Suite 220 Cameron Park California 95682 (530)676-6884 (530)676 6885 Fax <br />