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i <br /> MAY-11-1995 09 55 GEOMATRIX Felt] 209 264 '7431 P 91/02 <br /> i <br /> .. � G�v�c cfn-mc.r Sgetare <br /> 2444 Menn Street Suite 215 <br /> Fresno Gagumia 93721-2734 120MACTRIX <br /> (20'al 264-2535 a FAX(209]264.7431 <br /> • 11 May 1995 <br /> Traject C3077 <br /> Via Pmmirnib=209464-0139 <br /> Mr.Hathn knoll <br /> San 7oagain C'.onuty Public Health Sen+nces-Environmental Health Division <br /> post office Box M <br /> Stockton, C aWarnia 95201 <br /> Sublet: Groundwater Monitoring And Sampling <br /> $40 North Aurora Street,Stockton,Q11&rms <br /> Chevron steal Estate Managemc;at Company <br /> Dear i14r ISnoll: <br /> AS you requested In aur telephone conversation, yesterday, we have prepared thn letter on behalf of <br /> Chevron Rea! Estate Management Compauy addressing your questions regarding the groundwater <br /> mwartonng acdvittes to be conducted at the subject site On 12 Niay 1995 <br /> Three amtmg wens (MW 1, MW-2,mid MW-3) will be narnitored and sampled. Depth-to-water levels <br /> will be measured in cath well using an ekztrie sounder prior to purging. Groundwater WM be inspected <br /> for the pu sence of separate-phase liquid petroleum hydrocarbon using either an acrylic bader or are <br /> mterphm probe The wells will be piuged and sampled in the order 6a110w1mgMW-3,MW-2,and MW-1. <br /> At least Four casing volumes of groum1water will be.purged from each well using a submerse'ble pump or <br /> • banes Feld pararimmm (electrical conductwety,pH,and temperature) and the clarity of the water will <br /> be monitored during purging. Selected groundwater samples will be filtered in the field using an in-Ime, <br /> positive pressure, 0.45 micron fitter. Groundwater samples wdl be Collected m labo mimy-pre-parW <br /> containers,placed m an ioe-cooled client,and transported to Amerkm Ew onmeaud Network labs mtory <br /> (AEN)in pleasant Iii-ll, California, for cheancal a9aly5e5. <br /> AEN's California DOHS certifiicatkm number is 1172. The samples will be aw4med for ithe fallowing <br /> constituents: <br /> 1. bettzcate,toluene,ethylbamene,xylenes using U.S Euviroo m=tal Protection Agency <br /> (EPA) Method 8240,sample not filtered m the field: <br /> 2. total petroleum hydrocarbons quantfeed as dtmel MR D) using ie�tlar modified <br /> FPA Method 8015,saniple not 01tered m the field, <br /> 3 TPH D wing modffied EPA Method 8015,sample filter in the field;sad <br /> rveamatrix onmmuftanza, One. <br /> Engreem.Geolag= and 6nvn3nmentel Staa=w <br /> I <br />