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i <br /> Ev'E <br /> 0 <br /> Woodward-Cts ConsmHants <br /> water, triple rinsed with tap water, then rinsed with distilled water. The augers were steam <br /> cleaned prior to'ana between each boring. The boring lots are presented in Afpendix A, <br /> Th., cuttings from the borings were placed in the soil stockpiled from the gasoline tank <br /> removal operations. <br /> 4 <br /> Monitoring wells were installed in each of the three borings. The wells were constructed <br /> with 2-inch diametar schedule 40 PVC piping, slotted over the bottom 15 feet. The wells <br /> were installed to a total depth of 90 feet (10 feet below the groundwater surface). A typical <br /> monitoring weli construction is shown on Figure 3. <br /> The samples were submitted to WCC analytical laboratory located in Pleasant Hill, <br /> California under chain of custody. Three soil samples from each boring were selected for <br /> laboratory analysis based ca the VOC concentration and on visual observation of the soil <br /> conditions. The soil samples selected for analysis from e;rh Loring were as follows; , <br /> - 1. the soil sample collerWd above the groundwater interface, <br /> 2. the soil sample with the highest VDC concentration above sample 1, and <br /> w.I <br /> 3, a soil sample with a low VOC concentration above sample 2. <br /> The samples were anaiyzed for TPH (gasoline) by EPA method 8015, BTEX by EPA . r <br /> method $020/5030 and total lead concentration by EPA method 7241. The soil samples ' <br /> —' selected for analyses were at depth intervals of 26.1-26.5 feet,51.1-51.4 feet and 74.6-75,0 <br /> feet in MW-1;at depth intervals of 40.1-40.5 feet,50.6-51..0 feet and 75.6-76.0 feet in MW- <br /> 7, and 41.1-41.5 feet, 55.6-56.0 feet and 75.6-76.0 feet in MW-3. <br /> 2.2 GROUNDWATER INVESTIGATION <br /> Groundwater samples were collected by WCC on August 20, 1991 from the three monitoring <br /> wells(MIN-1, MW-2 and MW-3). Prior to sampling,each monitoring well was sounded to <br /> determine the distance from the top of the "Christy" box to groundwater and to determine <br /> the thickness of free product (if present). The wells were developed and purged prior to <br /> w <br /> 91C0MA./?,WD tMART.WC'ID0,911FU P 2-2 <br />