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i... %2001 %.001 <br />NATIONAL ADVERTISING COMPANY— ADDITIONAL SUBSURFACE INVESTIGATION HEALTH AND SAFETY PLAN <br />3.0 SITE BACKGROUND AND SCOPE OF WORK <br />w <br />3.1 SITE BACKGROUND <br />lr <br />A 1,000 -gallon unleaded gasoline underground storage tank (UST), piping and dispenser island were <br />removed from the property at 2050 W. Fremont Street in August 1992. <br />Earth Tech was not present during the tank excavation, removal, or subsequent sampling and assessment. <br />The owner of the property at the time reported that the UST appeared to be in good condition. <br />.� Samples collected from the bottom of the tank excavation were analyzed by Twinings Laboratory. These <br />R samples indicated residual hydrocarbons in the soil, as summarized in Table 3-1. <br />TABLE 3-1 RESULTS OF SOIL ANALYSIS SAMPLED COLLECTED 10/02/97 <br />Soil Sample <br />BTEX (-g/kg) TVPH-Gasoline MTBE (—g/kg) <br />(-g/kg) <br />Not Analyzed <br />S-1 (North Bottom) None Detected None Detected Y <br />S-2 (South Bottom) Benzene - ND <br />600 Not Analyzed <br />Toluene - 37 <br />Ethylbenzene - 46 <br />'^ Xylenes - 85 <br />GS -I (Stockpile) None Detected <br />None Detected Not Analyzed <br />i- <br />3.2 SCOPE OF WORK <br />3.2.1 Direct Push Sampling <br />Earth Tech will advance one direct push sample borehole of gvolatelecenter <br />compounds detect ble byfield location. The borehole will be extended to the maximum depthface (BGS}, whichever is greater. <br />instrumentation and visual observation or 20' below ground sur <br />f <br />The depth to first occurrence of groundwater is estimated to be at 10 to 20 feet BGS. <br />3.2.2 Soil Sampling <br />soil <br />Under the direction of a Mr. Phil Nicolay, a Reg istod the°lige t push boreholeist with Earth . The continuouscore <br />will be <br />samples will be cnllccted during the advancement <br />collected in specially cleaned transparent plastic sampling sleeves• e foot intervals, or whenever the <br />Soil samples will be collected forsplulaboratory analysts at five <br />lithology changes, whichever Is most <br />freqent <br />collected for laboratory analysis will be capped, labeled,refrigerated, and submitted to a <br />All soil samples col for analysis. <br />California state -certified laboratory groundwater is encountered. <br />p eth leve bailer should g for analysis. <br />A water ated and submitted to a California state -c <br />sample will be collected using a cleaned olY y <br />The water sample will be refrigerertified laboratory <br />02/09/98 <br />3-1 <br />hslprojsup\com\nachasp.doc <br />