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<br />- <br /> <br />t \."~,, <br />E~hlh. 1"'1 <br />\>A'~2.. . <br /> <br />600701002 <br /> <br />environmental analysis beginning at IS feet bgs. Geotechnical soil samples will be obtained <br />between the depths of 5 to 30 feet bgs. A discrete-depth groundwater sample will be collected <br />by Hydropunch@ sampling if groundwater is encountered. The objective of this boring is to <br />determine if groundwater is impacted as a result of the service station operations and to obtain <br />information necessary for the potential shoring design. <br /> <br />Borings B-2 through B-6 <br /> <br />Borings B-2 through B-6 are intended to define the lateral and vertical extent of soil <br />contamination for remedial response cost analysis. Boring B.6 will only be installed if gasoline <br />impacted soil is apparent in boring B.4 based on field operations. The borings will be advanced <br />by a direct-push Geoprobe@ sampling rig to depths of approximately 40 feet bgs. Soil samples <br />will be collected at five-foot intervals for environmental analysis beginning at 15 feet bgs. <br />Geotechnical soil samples will be obtained between the depths of 5 to 30 feet bgs from one or <br />more of the borings. <br /> <br />Logging and Sampling Analyses <br /> <br />All borings will be logged and soils will be described according to the uses soil classification <br />system. Soil samples obtained for environmental analysis will be submitted to a State of <br />California Certified Analy1ical Laboratory for analysis of total petroleum hydrocarbons as <br />gasoline (TPll-g), and benzene, toluene, ethyl benzene and total xylenes (BTEX) by EPA Method <br />8015/8021. At least two (2) soil samples from each boring will be further analyzed for volatile <br />organic compounds (VOCs) by EPA Method 8260. The additional analysis will be performed on <br />those samples that exhibit the highest concentrations of contaminants as determined by the initial <br />8015/8021 analyses. Groundwater samples, if any, will be analyzed for TPB-g and BTEX <br />compounds utilizing EPA Method 8015/8021 and VOCs utilizing EPA Method 8260. <br /> <br />Leighton Consulting will collect up to four (4) soil samples from depths of 5 to 12 feet bgs and <br />18 to 22 feel bgs for geotechnical analysis to ascertain the physical soil properties to aid in <br />potential shoring design. These samples ",ill be analyzed for direct shear strength utilizing three <br />points to estimate slope stability. <br /> <br />Two bulk samples will be collected utilizing the cuttings from all borings installed as part of this <br />investigation. The bulk samples will be analyzed for maximum density testing utilizing the <br />modified Proctor Compaction with a 4-inch mold. Maximum density testing is required for <br />backfill operations associated with any overexcavation to be performed in accordance with the <br />potential shorinQ activities. ' <br />v . <br /> <br />" <br />