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i <br /> ACTON • <br /> MICKELSON • <br /> van DAM INC. ENVIRI ONNIEWAL PEA!_TH <br /> �.� Pr-PIKI 'Z1_'RU1l^F <br /> 9 <br /> 4 NOV 17 F#nf}11,tjg Scientists, Engineers, and Geologists <br /> October 24, 1994 <br /> Mr Randall K Stephenson <br /> Ultramar Inc <br /> 525 West Third Street <br /> Hanford, California 93230 19011 0517 <br /> Subject Additional Soil and Ground Water Investigation--Beacon Station #419 <br /> 2350 Waterloo Road, Stockton, California <br /> Dear Mr Stephenson <br /> Acton • Mickelson • van Dam, Inc (AMV), has been authorized to continue an investigation <br /> of soil and ground water conditions at Beacon Station #419 located at 2350 Waterloo Road, <br /> Stockton, San Joaquin County, California (Figures 1 and 2) This letter summarizes the results <br /> of soil boring, ground water monitoring well installation, and ground water sampling performed <br /> at the site on July 5, 6, and 8, 1994 <br /> Scope of Work <br /> The work included advancing three 10-inch-diameter soil bonngs to a depth of approximately <br /> 85 feet below grade and completing each of these bonngs as a 4-inch-diameter monitoring well <br /> (MW-1, MW-2, and MW-3) The soil boring for monitonng well MW-1 was drilled to 95 feet <br /> below grade and was backfilled with bentonite chips to 85 feet below grade Monitoring well <br /> locations are illustrated on Figure 2 Methods used to drill and sample the soil bonngs are <br /> described in Enclosure A The soil boring logs containing descriptions of soil characteristics <br /> are Included in Enclosure B <br /> Selected soil samples were submitted for laboratory analysis of benzene, toluene, ethylbenzene, <br /> and xylenes (BTEX), and total petroleum hydrocarbons as gasoline (TPHg) Analytical <br /> procedures conformed to U S Environmental Protection Agency (EPA) and California <br /> Environmental Protection Agency, Department of Toxic Substances Control (Cal-EPA) approved <br /> methods <br /> Ground water monitoring wells MWA, MW-2, and MW-3 were constructed of 4-inch-diameter, <br /> Schedule 40 PVC casing Monitoring well construction details are contained in Enclosure C <br /> The monitoring wells were developed, purged, and sampled in accordance with methods outlined <br /> rf / 1fPt125 mj <br /> 4511 Golden Foothill Parkway, Suite 1 � ��UG / j (916)939-7550 <br /> El Dorado Hills,California 95762 t C Fax (916)939-7570 <br /> 2- ^ 4414111 f <br /> cU C <br />