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Y F <br /> CONSULTANTS,.-INC. <br /> G E O T E C H N I C A L ■ E N V I 'R O;:N .M E N T A L ■ M A T E R I A L S -.. <br /> Project No. S9200-06-05A <br /> :_December 28, 2010 <br /> Y h <br /> Mr. Terrence Fox <br /> L <br /> 'Tfrtk <br /> California Department of Transportation—District,,,, ,`., <br /> Hazardous Waste Branch <br /> 2015 E. Shields Avenue, Suite 100 , r <br /> Fresno, California 93726 <br /> .t <br /> Subject: STOCKTON YARD MAINTENANd .STATION <br /> 1.604 B STREET, STOCKTON, CALIFORNIA <br /> CONTRACT NO. 06A 1141 skr� <br /> TASK ORDER NO. 5, EA NO. 10`-"OR-9300 <br /> REMEDIAL ACTION WORKPLAN"rY <br /> Dear.Mr.Fox: l 1 <br /> In accordance with the California Department of,jrarlsportation (Caltrans) Contract number (No.) <br /> 06A1141, Task Order No. 5, we have prepared%this.Remedial Action Workplan:(RAW) for the <br /> Stockton Yard Maintenance Station (the Site) located at 1604 B Street in Stockton, California. This` <br /> RAW-has been prepared in response to a San Joaquin County Environmental Health Department's f <br /> (SJCEHDIs) September 24, 2010, directive, describes our proposed scope of services and outlines the <br /> procedures and methods to be employed to.complete the services. The location of the Site is depicted <br /> L on Figure 1,Vicinity Map. <br /> SITE LOCATION AND DESCRIPTION <br /> The Site is located at 1604 B Street in Stockton, California, and contains various maintenance <br /> `buildings,.warehouses, several trailer buildings (offices), two aboveground fuel storage tanks (ASTs) <br /> and a gas house. The Site is bounded to the north-;by Clark Well and Equipment Co., to the east by <br /> vacant land, to the northeast by a mobile home park;"to the south-by residential development and to the <br /> west by B Street and. the Caltrans Shop 10 Maintenance Station. The existing improvements are <br /> depicted on the Site Plan, Figure 2. <br /> LBACKGROUND <br /> In December 1989, one 5,000-gallon diesel underground storage tank (UST), one 10,000-gallon <br /> r gasoline UST, two pump islands and associated product piping were removed from the Site. Analytical <br /> 1 results of soil samples collected from the UST excavation showed total petroleum hydrocarbons as <br /> gasoline and diesel (TPHg and•TPI-Id) concentrations up to 2;000 and 58 milligrams per kilogram <br /> (mg/kg), respectively. The former 5,000-gallon and 10,000-gallon UST locations are presented on <br /> LFigure 2. In September 1993, one 115-gallon backup diesel generator UST was removed from the Site. <br /> Soil discoloration and odors were .not noted during,the 1993 UST removal activities, and TPHd, <br /> benzene, toluene, ethylbe.nzene and total xylenes (BTEX) were not reported for the soil samples <br /> collected from the UST excavation and stockpile. <br /> L <br /> L <br /> i <br /> 3160 Gold Valley Drive, Suite 800 ■ Rancho Cordova, California 95742 ■ Telephone (916) 852-9118 ■ Fax(916) 852-9132 <br /> it <br />