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' Fila Ne.20-1129-30 <br /> September 23, 1997 <br /> Mr Tony Lopes <br /> Siegfried Engr z=11g <br /> 4445 Coronado Street <br /> Stockton,Cahfurnta 95204 <br /> ' <br /> Subject, ADDENDUM NO. <br /> LIMITED PEASE 11 ASSESSMENT <br /> WEBER POINT P SEAWALL <br /> ' ARCO SITE <br /> STOCKTON,CALIFORNIA <br /> Dear Mr Lopes <br /> Presented in this tetter ss a summary of additional tests and field explorations performed at the <br /> ARCO Ser ice Station loaned at 205 North Center Strut in Stocktaa. Caaorma- Reference is <br /> ' made Wow Limited Phasc it Assewin=t for this project dated July 14, 1997 Atthctimavur <br /> enVjT=nenW report was completed, access was not available to cha ARCO propestY. O test <br /> boring, B-2, Nvas located w=ediately adjaoeut to the ARCO propertY and the 3013 and <br /> groundwaier to this boring were tested for 440esrbons by Sequoia Labo'cator►eo. Identtfiablc <br /> hydrocarbons were not detected in fliese simples, <br /> On August 23- 1997. an 843 Bobcat with 8-inch diameter auger was used to exptorc the backfill <br /> ' soils behind the exlsung seawall at the ARCO site The exsshn$ seawall at this location will be <br /> sloped down to the-test sumlar to the seawall on the south bank. It is also tentauveiy planned <br /> not to remove the backfill soils as is currently proposed west of the ARCO site For this reason. <br /> ' it was considered apps-opriaw to explore only approximately 4 feet below cxwtina grade. <br /> Unfortunately, the Bob=drilling equipment encountered refusal at appm=ztely 12 locations <br /> within the planter area on what appeared to be a concrete slab located I to 21h feet below the <br /> surface The generdl soil conditions encountered to these depths included D to 12 inches of light <br /> ' brown silty sand in a loose condition: 12 to 1$inches aggregate base rock; 18 to 21 ruches brown <br /> sand, 21 to 25 inches dark broom moist clay,and 25 to 27 inches asphalt concrete We note that <br /> pM readings taken in these shellow primas dui not mdicate the presence of hydroombone. At <br /> ' one location, a 1-ineb diameter drill was used to evvluate the thickness of the conmete and the <br /> undetlymg sail conditions. The mytweta measured appv=tnately 6 inchras to thickness,and was <br /> underlain by vary loose 3011 tient appeared to contain voids to the depth of 48 ancltes. <br /> 231 129-30/1017R492 r ° 3 <br /> �j777,tUantcJdeY.7ew S'gPt@�SbFf'�r 15>9797 <br />