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_ k <br /> I <br /> 1r1%� <br /> 1 .. <br /> Field Sampling Report <br /> �.• for <br /> I San Joaquin County <br /> Underground Tank Area Sampling <br /> �w. <br /> Stockton, California <br /> is <br /> On April 14, 1988, WESTON and their subcontractor, <br /> Inc. , in conjunction with Evans Brothers Inc, Erickson, <br /> underground fuel storage tank> and gathered soil samples fromfthe <br /> bottom of the tank areas. <br /> The ROy F. WESTON representative Erik A. <br /> the site at 9:30 am. On <br /> Brothers, Inc. (EBI) situ were threerworkers <br /> J arrived <br /> for Evan's <br /> and two representatives of <br /> r-� The EBI crew had excavated a Erickson <br /> gallon unleaded Portion of the north west ZOTOOp <br /> ` not made gasoline tank. It was discovered that EBI had <br /> were madep to obtain onsto It <br /> and t arrived ired dry ice. <br /> r' tanks were filled with a y Provisions <br /> approximately 15 11:05 am. The <br /> k <br /> capacity with dry ice. Once filled with dry Pounds <br /> r pOUreadin s <br /> were obtained. gallon <br /> f„ 2 g <br /> T this time both the local health district <br /> department official were on�-site to official and the fire <br /> sampling. At 11:50 oversee the tank removal and <br /> am, the 0 <br /> k (Note: for tank designation, refer r to Figure )reading for a werenksTll% and T-5 <br /> and 12% <br /> respectively. The excavation equipment moved to the location of <br /> these two tanks and began removal. <br /> removed and loaded onto At 12:15 Pme tank T-4 was <br /> visible signs of leakage butes strong so�uc}c. The <br /> the excavation area, tank had no <br /> At 12:30 g solvent odor emanated from <br /> tank� . loaded onto the truck. This tank p exhibited Tno visibl-5 was e leakaae� <br /> r ; <br /> The backhoe operator then broke u <br /> Crete pad and at 12;50 m. P and removed the bottom con- <br /> bottom area. Two soil samples Swere es were taken from the tank <br /> the tank area. These samples were gathered from each bottom of <br /> walled brass tube into the sail underneatgathered bfi driving a thin <br /> area and center of the tank bottom area. Once the samples owere <br /> ,.� obtained, the tubes were sealed with aluminum foil and plastic <br /> end caps. The samples were labeled T-4, T-4b, T-5 and T-5b. <br /> fto <br /> b designation for the sample label to be analyzed or BTX signified middle to end The <br /> �.., tank area. The samples were <br /> Organolead. , TPH, EDB and <br /> At 12:40 pm, 02 reading for tanks T-2 and T-3 were obtained. <br /> Their oxygen levels were 13.91 and 13.61 respectively, <br /> 6 <br /> At 12:57 pm, an o, reading was taken for tank T-1. The Oz level <br /> was 10.5 . At 1 :10 pm, removal of tank T-2 began. Duringthe <br /> excavation, noticeable product was observed near the fill pout <br /> area and the the bottom sands were gra <br /> were taken 171 from the surface underneath he end0ofmtank mama <br />