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1.0 Executive Summary <br /> This report presents the results of a Leaking Underground Fuel Tank LUFT Site <br /> Assessment at Derickson Trucking located at 15658 S. Escalon Bellota Road, <br /> Escalon; California. The report includes discussions of the site's history, the field and <br /> analytical methods used, the assessment findings and an interpretation of the findings <br /> and risks to the environment. Remedial alternatives and recommendations are also <br /> offered. <br /> �On October 1-992-three underground-storage-tanks�were?re.move:d;.fromathe-property <br /> by�Crisp-Constru`ctidh.Company -A�1.2;000-..g Ilon-diesel tank and-a20-gallon <br /> g:asali_nB tank.were;located�togeti�er4near the-entra_, r%ce�to=the-priope_rty andia2;000 <br /> galfon:wasme oil tank'was situated;- parately adjacent to,a-warehodse Sail=samples. <br /> collected;benaaththe_north endwand center of-the d es91-tank w r-difound to.-con_tai <br /> ; <br /> diesel4fu�l�co.nstituents A characterization of the site was required by the San <br /> Joaquin County Department of Health Services. AquaGeosciences Inc. (AGI) was <br /> retained to perform the assessment. <br /> (FOur-borings were-drilledFadjacent.to}the-oppn:diesel,tank4excav-tions„The borings <br /> were advanced to a maximum depth of 40 feet to delineate the vertical and horizontal <br /> limits of impacted soils. Drilling operations, soil sampling and field screening were <br /> conducted according to standard protocols. Selected samples were submitted to <br /> certified laboratories for chemical analysis. Hydrocarbons-were-encourYteredaonly bye <br /> Boring�-D-1��angie drilled-uder�#heyforme a k from thenorth end of the�e cavation� <br /> Based}-on -the::field''andYarfalytical-results;-an-area-of;300Vt,C55.OLsquare:feet=may-bei-- <br /> impacted by.diese!}hydrocarbons yThe plume extendCf6-..a-depth-o#tiat�least=33=feet”"- <br /> The highest TPH(diesel) concentrations reported are 4100 ppm. <br /> In addition, a fifth boring was advanced to 10 feet at the site of the former 2,000 gallon <br /> waste oil tank to obtain a sample for Nickel and Chromium analysis. The metal <br /> concentrations detected were well below regulatory limits and appear to represent <br /> background concentrations. <br /> The water level in a domestic water well located on the property occurs at <br /> approximately 90 feet and in the past, a water table as high as 50 feet from the ground <br /> surface is reported in the Escalon area. A LUFT Manual Leaching Potential Analysis <br /> was performed to evaluate risks to groundwater resources. It indicated that the site <br /> falls into the medium leaching potential category. TPH(diesel) concentrations at the <br /> site exceed the 1000 ppm maximum allowable level established in. the guideline for <br /> that category. Therefore, AGI recommends remedial action to mitigate this threat and <br /> remove any environmental liabilities for the property. Excavation of the impacted soil <br /> mass to the greatest extent practicable by conventional equipment, followed by <br /> bioremediation on-site offers the most cost effective solutions to the problem. <br /> 2 { <br />