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ALONC*We <br /> VIRONMENTAL <br /> CONSULTANTS <br /> 131 NORTH TUTIN AVENUE • SUITE 213 .T uMN,CAMFORMA 92780 941 SHOREPOINT COURT• SUITE F121 •AL mA,CALIFORNIA 94501 <br /> TEL:014)836-6632 • F. :(714)836-6642 TEL:(510)521-2441 • FAX:(510)521-2607 <br /> P <br /> June 5, 2000 <br /> s� <br /> Mr. Kashmir Singh ; <br /> Mr. Dalwinder Dhoot <br /> Joe's Truck Stop <br /> t <br /> 15600 South Harlan Road o <br /> Larthrop, California 95330 w <br /> Subject: Work Plan for Additional Soil and Groundwater Assessment at Joe's Truck Stop, at <br /> 15600 South Harlan Road, Lathrop, California. <br /> Gentelmen: <br /> Pursuant to your request, Avalon Environmental Consultants (Avalon) presents this workplan <br /> to perform a further soil and groundwater assessment at Joe's Truck Stop at 15600 South <br /> Harlan Road in Lathrop, County of San Joaquin, California. The additional investigation is <br /> prompted by a letter from Public Health Services San Joaquin County (PHSSJC) dated April 3, <br /> 2000, in which further characterization of the subject property was requested. This additional <br /> investigation will consist of performing additional testing both onsite and offsite with a <br /> geoprobe device. The purpose of this investigation is to determine, to the extent possible, the <br /> horizontal limits of Methyl Tertiary Butyl Ether (MTBE) and other hydrocarbon contamination <br /> in the groundwater at the subject property. Additionally, this investigation will determin more <br /> detailed lithologic information near the area of impact, offsite to the northeast, and west, along <br /> existing utility trenches. <br /> The first quarter groundwater monitoring report showed levels of MTBE at 1,800 ppb in MW-2 <br /> which is a well located to the northeast of the former tank pit. Levels of MTBE within the tank <br /> pit in well MW-1 were lower, 250 ppb. The second quarter groundwater monitoring showed <br /> a decrease in the well MW-2 from 1,800 ppb to 290 ppb and an increase in MW-1 from 250 <br /> ppb to 2,800 ppb. <br /> This investigation will consist of performing continuous cores collected from ten geoprobe <br /> borings placed near the area of impact, offsite to the northeast, and west, along existing utility <br /> trenches. Select soil samples will be analyzed for Total Petroleum Hydrocarbons as Gasoline <br /> (TPH-G) by EPA Modified 8015, Benzene, Toluene, Ethyl Benzene, and Xylenes (BTEX) by <br /> EPA Method 8020, and for Oxygenated Compounds which will include Tertiary Butanol, <br /> MTBE, DIPE, ETBE, TAME and lead scavengers by EPA Method 8260. Select soil samples will <br /> be analyzed for porosity, permeability, bulk density, organic carbon, and moisture content as <br /> requested in the PHSSJC's, April 3, 2000 directive. <br />