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F� <br /> OF] GROUNDWATER <br /> ❑D❑ TECHNOLOGY INC. <br /> 4057 Port Chicago Highway,Concord CA 94520(415)6712387 <br /> FAX (415)685 9148 <br /> October 4, 1991 <br /> Job No 020301211 <br /> Mr Steven K Schneider <br /> Public Health Services <br /> San Joaquin County <br /> P O Box 2009 <br /> 445 N San Joaquin Street <br /> Stockton, CA 95201 <br /> RE SOUTHLAND CORPORATION STORE NO 20680, 9110 THORNTON ROAD, STOCKTON, CA, TANK <br /> PIT AND LINE TRENCH SOIL ANALYTICAL RESULTS <br /> Dear Mr Schneider <br /> This letter is provided to present the analytical results reported for the tank and line removal activities <br /> conducted at the subject site on September 16- 17, 1991 On September 16, the three underground storage <br /> tanks were removed Two soil samples were collected from the pit floor beneath each tank for a total of six <br /> samples The two samples per tank were collected from opposite ends of the pit to correlate to areas beneath <br /> the fill and pump ends Figure 1 is provided to depict the sample locations The following defines the <br /> approximate depths from ground surface at which the samples were collected <br /> SAMPLE ID DEPTH <br /> T1 E-1 1 5 11 42 feet <br /> T1 W-13 5 1342 feet <br /> T3E-13 130 feet <br /> T3W-13 1 1301 feet <br /> T2E-13 5 1342 feet <br /> T2W-13 0 130 feet <br /> A backhoe was used to collect soil from the desired location in the tank pit A sample was then collected from <br /> the soil in the back-hoe bucked by scraping away the top layer of soil and then driving a 2-inch x 6-inch brass <br /> tube into the soil until the tube was filled The tube was then capped, taped, labeled and placed on ice for <br /> delivery to a state certified laboratory under standard chain-of-custody procedures <br /> The tank pit samples were initially delivered to GTEL Environmental Laboratories, Inc (GTEL) in Concord, <br /> California When it became known that GTEL would not be able to perform the petroleum hydrocarbon <br /> analysis on a 24-hour turn-around, the volume of soil required for the lead and ethylene dibromide (EDB) <br /> analysis was removed from each tube and retained by GTEL The sample tubes with the remaining soil volume <br /> were then transported to Superior Precision Analytical, Inc (Superior) in Martinez, California for analysis of <br /> petroleum hydrocarbons <br /> i <br /> 1002D$1 sou <br /> Offices throughout the US Canada and Overseas <br />