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t Moe !G ?©G$ 3: 35AM Ra, -- ge Env i ronm'enta 1 , Inc ['77F,L. S35 i -77240 2 i �. MAG .a ENVItRONMENTAL,tNC + mss 46.3•5 S.Meadows Pkwy,Ste.20 IrMu 157 Reasa,NV OR5 '1 r TO(775) 851-7239 Fax(775)851-7740 November 15,2006 { Ms. Vicki McCartriey VIA FACSIMILE AND REGULAR MAE, Sar!Joaquin Coimt-y EHD 304 Fast Veber Avenge, TMrd Floor Stockton,CA 3.52.02 Re: Request for Work Plan 17araaneIe San Joaquin.Conant;Courthouse, 222 E.Weber Avenue; Stockton Eta Site Code: 1285,USTCF Claim#15630 De:u Ms. MrXaltm. ,Y: It was a pleasure to speak%Aith you yesterday re arclarx I-woposed aiodificat.tons to an. � approved work plan for the abov€�-referee ced prooject. A, you xegt�estPf�;this cc�rrespandenc e outlines proposed changes to Ramage EA ironrrental's R,e-visea t,Yar'k Plan_, dated Au gust 4,2006. San JoaclWn County EHD approved the r'e,�rise er work play,,on September 18,2006. Ramage Enviranmelital proposes to collect soil and groua dwator-grab samples frorn th;-ce on-site ideations using a direct-puah drilling rig lrrstead of a hollo- -stern auger drilling rig. The direct-push rig has a lower overhead.;clearance, whi=ilk-will allow better access t4 d illirt? locations near overhanging tree limbo. A secondary ad.vantaao of direct-p+ash drilling irr the minimization of d ill cuttings and•�,vaste soil storage and cais sal. Besides the drilling inetlaod changti, Ramage Err iro -neural does not propose to significant y modify the approved scope of work. Soil and groundweeT-grab samptcs will b4--collected at three pre-viously-approved on-site locations(see enclosed map). Two of the soil baring s are located in a slab grade pa3rldng area, and V�?tlill be advanced to a depth of approximately 15 feet below the sub suede. The third soil boring is located in a street grwle as-plv.lt parking a:ea i and NVi�, be advancQd to,a,depth of approximately 35 feel b,fow street grade. ' A C-57 licensed drilling cont-lactcr will drill the two-Lech diantLeter soil be-kings with a direc i push dxiiling 69. At four-foot inter5rals wring drilling;the driller will collect continuous cares into two-inch diameter,clear,poirvinyl chioride(PVC)�leeves. A field geoid&t wil l log the conflnuc as cores for hlrzchiccha ' corsires arxorErT to taegs gbr lrnif ed Soil Classification System wid kreerr each sample for organic :vapors using a � photoionizaiion dieEeete-f (P6).