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CHhV EMC SUPRFND Vel Me UOU6 UV/11 'U6 15:6( NQ.Y)d U5 Scott Mansholt -2 A 9 September 2003 hevronTexaco West 13yron Road Corridor groundwater sam.ples should r.ncl.u.d.e Notal petroleum hydrocarbons as gasoline(7°PH-g), benzene, toluene,, ethylbenzenc, and xylene (BTE,X), and.rnerh.yl tertiary butyl. cth.er(M'J3E). 2. Sinnil.a,r.•ly, we concur with the consultants proposal to advance additional borings north.ofCh.e Sou,7a property within the Byron Road easement,to collect.soil. and.groundwater samples for a,rr.alysis. $i.milarly, as described above, at least four groijudwa.ter sarnples should,be obtained, for analysis ftom. borings Without free prod- uv-3. Off-site soil and.groundwater information needs to be provided dor the Caldron's Store leaking undergroundstorage tank(UST) investi.gatioti, c:on.t'irm,ing that leaks have not migrated down.gradienf into the Byron Road easern.ent. If the informatiori ca.n.n.ot be obtained., a soil boring(s) shou.l.d, be advanced north of the store and. form,er US's"exca-vation.to collect soil and groundwater sarn.ples. Soil and groundwater samples should be analyzed for petroleum.hydrocarbon. a.n.al.ysi.s as described in item#1 above. 4. During PG&E's March 2003 investigation Within.the Byron Road easei..en.t, north,of the Monterosso property,concentrations of TPH-g were i.dendfied in soil and.groundwater. we reoom.m.en.d that an additional boring(s) be advanced near PG&E boring B-1.0 and in the vicinity of borings )3-14 and 1.5, to collect soil a,n.d.grouDdwa.t.er samples for ana-lysis as descrIbed in item#1 above. . The wel.1. survey and search has i,denti,fied several, private domestic water weals along the south side of Byron Road from.the McCorrn.ack proper,ty to Jmer.st_at.e 205. We recommend.tb.at a.grou.n.d.water sam.pl.e be obtained frora the wells and submitted,for petroleum.hydrocarbon analysis as described in i.tel.n.#I above. hevaronTexico and Regional Boardstaff, to expedite d)e characterization' process during tb,e course of the investigation.work, will review the results of analysis and.field observations to d.et:ermi.ne the need for additional borings a.n.d sampling. We con-cu-r with the 18 August 2003 West Byron Road Corridor workplan, provided our cotr).mQn.ts oudi.n.ed above.are addressed. Jf you ba.ve any questions or comments, please contact Dears.Hubbard at(559) 44-5-51.79. Please notify Regional.Board staff at least.48 hours prior to corn.m.encin.g the field investigation and.drilling acti.viti.es. Senior.Engineering Geologist Associate Engineering Geologist: RG No. 6357 cc: Mr. Mike Infurna, Barr Joaquin County Public I-Teal.th Services,Stockton :r. Garrett Turner, SATC, Qaklaind Mr, Gary Foote, Georn.a.trix, Oakland.