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Consulting Services <br /> USPCI EN ifi,?C`P.4,.3PL"TAI <br /> A ffff==is:COMPANY <br /> January 23, 1996 <br /> 49 <br /> Mr. Harlin Knoll <br /> San Joaquin County <br /> Public Health Services <br /> Environmental Health Specialist <br /> 445 N. San Joaquin Street <br /> Stockton, CA. 95201 <br /> RE: Proposal for the Subsurface Investigation of the Diesel Fuel Spill near the Union Pacific <br /> Railroad yard at 833 East 8th Street, Stockton, California <br /> I <br /> Dear Mr. Knoll: <br /> At the request of the Union Pacific Railroad (UPRR), USPCI, a Laidlaw company (Laidlaw) is <br /> pleased to present this Proposal for the Subsurface Investigation and Reporting requirements for <br /> the diesel fuel spill site near the UPRR railyard at 833 East 8th Street in Stockton, CA. The <br /> proposed scope of work consists of the following tasks: <br /> • Drill approximately three soil borings each to an approximate depth of 35 feet in <br /> the immediate vicinity of the diesel fuel spill (see Figure 1). Soil borings will be <br /> drilled using a hollow stem auger drill rig. <br /> • Continuously monitor soils during drilling with an organic vapor meter (OVM) <br /> and conduct field analyses on soil samples using an EnSys- Portable Analytical <br /> TPH Test Kit. The EnSys-Kit will be used as a screening tool to aid in selecting <br /> soil samples for laboratory analyses. <br /> • Laboratory analyze approximately two soil samples from each boring location for <br /> TPH (EPA 8015 modified) and BTEX (EPA 8020); <br /> • If additional borings are necessary a "step-out" approach will be used to evaluate <br /> the limits of diesel impacted sub-surface soils. <br /> • If groundwater is encountered during drilling, one groundwater monitor well will <br /> be installed in a location in the immediate vicinity of the diesel spill. The <br /> monitor well will be measured for groundwater elevation and free product <br /> thickness. If diesel is not present then a groundwater sample will be collected <br /> and analyzed for TPH (EPA 8015 modified) and BTEX (EPA 8020); <br /> • Initiate free product recovery from the monitor well if there are measurable levels <br /> of diesel fuel. <br /> 5665 Flatiron Parkway Boulder,Colorado 80301-2800 <br /> Phone 303.938.5500 Fax 303.938.5520 <br />