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I ' IT T s Work Plan'For Soil Sampling Following Pioduct Piping Removal Tosco (76) 1111193 sa August 21;'1998 ° e ` ,. ` '' c v , SiG y "n r 1� SCOPE'OF WORK' °+ * GR will collect the required compliance'samples beneath the product-,pip'ing and dispenser islands 'Groundwater is norltkely to'be encountered in the initial trench excavations°;'I -.1 mpacted soil,is i l encountered and Tosco elects-to excavate the impacted soil; GR will observe the over-excavation L' x activities;and collect.confirming soil saniples from'the pit-,To unplement this.scope of work, GR TM ` proposes'the.follow'iiig tasks:. E 4 Task i 'Compliance Sampling 1 * Product piping will be removed by Tosco s contractor =The backfill will be:iemoved'from the f <,piping trench'.and stockpiled 'SoiLsamples will.be collected from"'the native„soil beneath the > product.piping on the basis'of one soil sample per 20 lineal feetof piping ,Soil 'samples will be a�g k, ;.” screened in the field for the preseace'of volatile organic vapors using a photoiomzation detector. `, , GR sample.collectionand_'bandling procedure's,are described m Appendix A.,4f groundwater is s "4 encountered in the trench excavations; a grab'groundwatersample will be collected. Soil samples :. i will'be collected from the.sidewalls of the trenches as r'egmred by;SJCPHS,guidelines.':¢ Excavated backfill material,will be stockpiled at the.'site pending dis;posa( The stockpile,will be r placed on and covered with plasticsheetmg: ,Four discrete samples will be,collected;from [he d stockpile and submitted to the laboratory4or composithig and analysts as;one sample This composite sample will be analyzed "for TPHg .'BTEX ,MTBE and lead as-,required for disposal J at the.Forward landfill.,in Manteca;,CA ; i Y Compliance-soil samples mill be analyzed at :Sequoia Analytical a State certified Hazardous Materials Testing taboFatory (EI,AE#1210,#I1 7,1 and#1624) Soil samples from beneath the ':_ s n' product lines-will be analyzed for-Total Petroleum'`Hydrocarbons 1.as gasoline (TPHg)'.by EPA r', Method 801'5/DHS L'UET for benzene toluene;'ethyllienzene and total xylenes.(BTEX)by EPA., Method 8020 "'total lead by. EPA 1vleihod 6010; and the fuel oxygenates methyl tert-butyl ether i (MTBE) -tert-butyl alcohol, (TBA);di-isopropyl ether(DIPE) ethyl.tert butyl ether(ETBE), and s tert amyl methyi ether (TAME) by EPA Method 8260 . a � Task 2 Over Excavation of•Impacterl Sorl }ta If,either subJective tleld evidence oiJanalytical data in soil beneath the site has'been , impacted by Uy"drocarbons Tosco imay elect to;excavate the impacted soil GR-wi observe the . .a x ' excavation aetivifiess Confirmation soilsamples will be collected f#om the base and lateral limits J of.the excavation'and analyses performed in accordancemith SJCPHS guidelines If groundwater r is.encountered,during overexcavation'activities; a grab;groundwatec sample will.be'collected in t ,a addition to the soil samples;collected from the trench sidewalls`above groundwater We do not ? +' 'ant,icipate that excavation will continue' eeperihan groundwater Arid therefore do notanticipate' the.need to pufnp wker from the excavation.- Soil edmoved.during,overexcava ion activities will ? i be stockpiled at�the sue lir the manner described above pending disposal z "x '� E x * r' Y ter':• n >r";. �'t ' - ' Y > i ?, -T011193 W Pl ' v rw 3a4': a 2 !. ` ,i`*- .t t 4 y n; 4 � y ` s r$k p, w.,dti L a add i fa r 4' h �T41, V F v