Laserfiche WebLink
_yP xx k n.�e,..._ '_f�, u[�. W"3Lv i,• - S lyh —2 C e4 � �L i�1 1 <br /> 3:. <br /> 991 <br /> Addendum to Work Plan June 13, <br /> ARCO Station No. 760,Lodi, California AGS 38048--6W6W <br /> I� S•. <br /> At ARCO's request, Applied GeoSystems will conduct the following tasks during the <br /> tank replacement: <br /> o Update the site safety plan. <br /> o Provide liaison with the San Joaquin County Public Health Services, <br /> Environmental Health Division (SJCPHS). <br /> o Monitor ARCO's contractors <br /> remove <br /> �andathe emocovering <br /> althe <br /> of the b backfill <br /> _ <br /> the <br /> removal of the underground storage tanks <br /> material. Backfill material will be stockpiled onsite and covered with <br /> plastic. <br /> o Collect soil samples from the base of the tank cavity far laboratory <br /> analyses according to SJCPHS guidelines. <br /> o Monitor ARCO's subcontractors installation of geotextile fabric in the <br /> i former tank cavity. ` <br /> _ yl <br /> o Collect four soil samples from approximately every 54-cubic yards of <br /> posited into one sample by <br /> backfill. Each set of four samples will be com <br /> the laboratory for analyses according to SJCPHS guidelines. <br /> o Monitor the excavation of the new tank cavity. Sail excavated from the <br /> new tank cavity will be placed in the old tank cavity lined with geotextile <br /> fabric. We will monitor installation of new tanks in the new tank cavity. <br /> a Soil excavated from the new tank cavity and placed into the old tank cavity <br /> on of the.new tanks, and disposed of. <br /> will be removed after installati <br /> o Submit selected samples.of the backfill removed'from the old tank cavity to <br /> a laboratory approved by ARCO for analysis e, total petroleum <br /> 3 hydrocarbons as gasoline and benzene, toluene, ethylbPnzene, and total <br /> xylene isomers. The composite sample from the stockpiled backfill <br /> material having the highest concentration of TPHg will also be analyzed <br /> using a Bio-Assay according to test method listed in California <br /> Administrative Code Title 22, Section 66696. In addition, samples from <br /> stockpiled backfill material will also be analyzed for extractable metals <br /> according to California Administrative Code Title 22. <br /> i <br /> 2 <br /> �J <br /> i <br /> 4 <br /> 4,4011e0GeoS.YWOMS <br />