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Brusea <br /> Associates, Inc. <br /> Environmental Engineering Geology <br /> September 11, 2023 <br /> Murphy Austin Adams Schoenfeld LLP <br /> Attention: Russell Austin <br /> 555 Capitol Mall, Suite 850 <br /> Sacramento, CA 95814 <br /> ADDITIONAL PLUME DEFINITION <br /> AREA OF FORMER UNDERGROUND FUEL TANK <br /> ANDERSON BARNGROVER RANCH PROPERTY <br /> APN 091-030-130 <br /> 14290 East Comstock Road <br /> Linden, San Joaquin County, California <br /> Brusca Reference No. 260-004 <br /> INTRODUCTION <br /> In accordance with your request, we conducted additional subsurface investigation at the subject <br /> site to further evaluate the limits of petroleum hydrocarbon soil impacts and the groundwater <br /> plume in the area of a former approximate 1,000-gallon diesel underground storage tank (UST) <br /> that was removed from the subject property in November 2022. Our scope of work included: <br /> advancement of three additional borings for soil and groundwater sampling; soil gas sampling; <br /> laboratory analysis of the collected samples; evaluation of the results; and, comparison of site <br /> information to Low-Threat UST Closure policy (LTCP) criteria adopted by the State Water <br /> Resources Control Board.' This report presents our findings. <br /> A Vicinity Map showing the location of the subject property is presented as Plate 1 and a Site Map <br /> showing the layout of the entire subject parcel with respect to nearby roadways is presented as <br /> Plate 2. A map showing the onsite farm facility where the UST was formerly located along with <br /> previous and recent boring/sampling locations is presented as Plate 3. Logs of the exploratory <br /> borings are presented as Plates 4 through 6. Groundwater diesel, benzene, and naphthalene data <br /> and inferred isoconcentration contours are plotted on site maps presented as Plate 7, 8, and 9, <br /> respectively. The soil and groundwater analytical data are summarized on Tables I and II, <br /> respectively. Soil gas analytical data are summarized on Table III. Drilling permit documentation <br /> and the analytical laboratory reports are attached. <br /> ' State Water Resources Control Board; "Low-Threat Underground Storage Tank Case Closure Policy"; effective <br /> August 17,2012. <br /> BruscaAssociates.com 9 1860 Sierra Gardens Drive,#332,Roseville,CA 95661 9 phone(916)677-1470 <br />