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3939 Cambridge Hoad <br /> Suite 220 <br /> C zul)eron Park, CA 95682-9007 <br /> M. 530.676.6384 <br /> Fax.530.676.6885 <br /> &e I d <br /> PWOUP <br /> October 19, 1999 <br /> Project 791701.00800000 <br /> LJ <br /> Ms. Carol OzR"tEC""Er' <br /> , <br /> San Joaquin County Public Health Services <br /> Environmental Health Division 211999 <br /> P.O. Box 388t. ,1rTH <br /> SER <br /> Stockton, California 95201-0388 ENV1R0 14�EN VICES <br /> PER�+1�� 1 <br /> Re: Additional Assessment of Hydrocarbon-Impacted Soil and Groundwater, at ARCO <br /> Service Station No. 2186, Located at 3212 North California Street, Stockton, <br /> California <br /> Dear Ms. 4z: <br /> Pinnacle Environmental Solutions, a member of The IT Group (Pinnacle), is providing this <br /> report of subsurface assessment activities conducted on behalf of ARCO Products <br /> • Company (ARCO) at Service Station No. 2186, located at 3212 North California Street, <br /> Stockton, California (Figure 1). Pinnacle conducted the assessment activities on August 24 <br /> and 26, 1999, consistent with the scope of work presented in Workplan to Further Assess <br /> Hydrocarbon-Impacted Soil and Groundwater dated April 15, 1999, prepared by Pinnacle. <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-1, <br /> B-3 through B-5, B-7, and B-8) and two 45-degree angle borings (B-2 and B-6). Three of <br /> the borings (B-1, B-4, and B-5) were converted to groundwater monitoring wells (MW-1 <br /> through MW-3), and three of the borings (B-3, B-7, and B-8) were converted to dual- <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 /> (0 <br /> V <br /> CI'\C:WrchivelArco121861Reports12186p106.doc � <br /> � <br />