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' J <br /> ' <br /> ) <br /> " <br /> ii 0 <br /> 011 <br /> ( i5 MAY 2 2 1992 <br /> iLED ' <br /> TECHNOLOGY,GROUNDWATER ENVIRONMENTAL HEALTH <br /> ' <br /> INC.rx�� 0 FAX(916)372-8781 | <br /> , <br /> 1 <br /> / <br /> April 28, 1992 Project No. 02320 2258 <br /> � . <br /> / <br /> Mr. Lon <br /> � <br /> � <br /> Kitagawa <br /> � <br /> BP Chemical � <br /> Advanced Materials Division <br /> � <br /> Stockton,. CA ----- / <br /> ) <br /> =EPRELIMINARY" " ="'^ ASSESSMENT | <br /> BP CHEMICAL <br /> 3437 SOUTH AIRPORT WAY <br /> STOCKTON, CALIFORNIA 95207 <br /> ' <br /> Dear Mr. Kitagawa: � <br /> / <br /> � . <br /> G.-_---'— Tach'-|-~'' Inc. —___ this |—_ — � <br /> � <br /> performed _ the above referenced facility - ' <br /> i <br /> summarizes activities 000c/ubeo in our October /oo / proposal <br /> with protocol recognized by the San Joaquin County Environmental Health Division. <br /> [ <br /> | <br /> OBJECTIVE <br /> The purpose of this work was to assess the vertical extent of gasoline hydrocarbons adsorbed to soilin � <br /> the vicinityo¢ the former underground stotank at the v <br /> included drilling two soil borings, one north and one south of the former underground tank excavation, <br /> and collection of soil samples for laboratory analyses. Additional provisions were included in the <br /> 0'� <br /> If photoionization detector (PID) readings in sa ples fro 20 feet below grade surface <br /> (bgs) or deeper exceeded 10 parts per million (ppm), a soil vapor extraction point was <br /> to be installed screened from 10 feet bgs to b Blow t he bottom of affected soil or to <br /> � <br /> If groundwater was encountered shallower than 40 feet bgs, a groundwater monitoring | <br /> well would beinstalled. .1 i <br /> � |fnohydrocarbons were detected inthe field, t e boringsvvou|d begrouted and sealed <br /> according to California Regional Water Ouafitv"Control Board (RVV(1CB) guidelines. <br /> K \ ' <br /> V � <br /> . � <br /> J <br /> offices throughout the US,Canada and Overseas <br /> U ' <br />