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Site Background Information . . 4 WELDON CHURCH PROPERTY , I104 West Beverly Place,-Tracy, California : collected.at discrete"'depth intervals from the majority-of the probe borings. Figure 2 depicts the locations of the-probe borings. TPH- was detected in�ihree;of the soil sam les anal zed at concentrations as high 2,800 m a g . p - Y g g/g (P3-6).,BTEX compounds were*,detected in the same three, samples at concentrations as high a& .93.ni total xylene,P1-6 ,.the s.2.8 maximum benzene concentration detected was mg/kg(PI.6). • gig( Y ) - Table 1 summarizes the soil samples•collected from tlie.probe borings,the site: . �. TPH- was detected in ab water samples at concentrations as hi as' 210 000 -m 1. •BTEX .g ,grab . . P . high � -mg/l. , compounds were also detected in four of five grab ground water,samples at concentrations-as high as 35,000,mg/l (toluene P6), the maximum benzene concentration detected'was 12,000 mg/l (P6).. Analytical.results of•grab water,sarrP. iles are summarized-ori Table 2. The installation'of the soil ; probe borings was summarized in the PIER prepared by AGE, dated 10 September 1996. ' r_ Between July 1996 and April 1998 a total of six wells were installed on the site or on surrounding, .' properties in order to determine the lateral and vertical limits of.the dissolved hydrocarbon plume. In July 1996, four soil ,borings. were,drilled and completed as 2-inch diameter ground .water � . monitoring wells with slotted screen from approximately 5 to 25_feet bsg. In April.1997,soil borings B5 (MW-5)and B6(MW-6)were drilled and completed as ground water • monitoring wells. Monitoring well MW-5 was completed using 2-inch diameter PVC casing with I a slotted.screen from approximately 3 to 10 feet bsg.Ground water monitoring well MW-6 was dual- com'Oleted with screen intervals installed from a depth of 20 to 23 feet bsg and 3 to 13 feet bsg. The installation of the first four monitoring wells was summarized in the PIER prepared by AGE,,dated. 10 September 1996.- On- 996,On'07 May 1998, soil borings B 13 through B 15'were advanced manually and one,boring Was- corn pleted, as'completed,as aground water monitoring well.Borings B 13;B 14(MW-7)and B-15 were established on the property at 52 West Beverly Place. The;installation of the borings was,performed using a six-inch diameter hand auger.., On 09.and 10,June and 26 August 2003;nine soil probe borings(B16 throu&B24)were advanced on- and off.-site: Seventeen.soil,simples were.analyzed;.TPH-g and various BTEX compounds were-detecfed-in samples B1775, 818-1'0 and B20-8, afmaximum concentrations-of 15 milligrams,per kilogram .(mg/kg) TPH-g (1320-8),0.52 mg/kg-benzene (B18=10), 0:18 mg/kg''toluene (B17-5), 0.24 mg/kg ' ethylberi'zene(B1 775)and 2.15 mg/kg xylenes(B17-5);xylenes was also detected in sample B 16-5.5 at 0.006 nig/kg.'The fuel additive MTBE was detected in the four soil samples anaiyzedfrom borings' - B 17 and B 18, at a•maximum concentration'of 0.29 mg/kg (1317-5).:MTBE was detected in:soil Advanced GeoEnvironmentai,Inc.