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MRY-11-1995 09 51 GEGMRTRIX F01 209 264 7431 P 01/02 <br /> Cnnc E;wvtcr Square <br /> 2444 Main Sanest E;Lu—315 uWllllls� <br /> Fresno California 93729 2734 IMMMATtRIX <br /> (2091 294-2535 a FAX 12091264-7431 <br /> • 11 May 1995 <br /> Project 03477 <br /> Via ft3imilm 209461-0238 <br /> W.Huhn KnoU <br /> San 7baquin County Public Health Services--Enviir7=011tal Health Division <br /> Post Office Baas 2W9 <br /> Stockton,California 95201 <br /> Subject; Gromubmter Monitoring and Sampling <br /> 544 North Aurora Street,SMckinn,Coliform <br /> Chevron Real Fstatce Ma»agezaent spay <br /> Dear W.Kno1L• <br /> As you requested in ow telephone convetmuan ye_sterduy, we have prepared this letter aft behalf of <br /> Chevron Real Fztate Management Company addrwmS your questions regardtng the groundwater <br /> mowitoring acdvrttes to be conducted at the sUblect sate On 12 May 1995 <br /> Thm cu&tmg wells (MW-1, MW-2,and MW-3) will be monitored and sampled. Depth-Am-water levels <br /> *%U be measured in each well using an electric sounder prim to purging. Groundwater wMI be inspected <br /> for the presence of separate-phase liquid petrol uun hydrocarbon using either an acrylic,bailer or an <br /> ruterphase probe. The wells wall be purged and sampled m the order following MW-3,MW-7,and MW 1. <br /> At least 1'ow casing volumes of groundwater will be purged from each wen using a submersible pump or <br /> bailer Fell parameters (electrical conducIftrtty,pH,and temperature) and the clarity Of the water will <br /> be monitored during purging. Setecbad groundwater samples will be filtered in the field Umng an in-lute. <br /> posrtrve-pressts~re, 0.45 micron ill= Oromndwata samples will be collected in laboratory-prepared <br /> contamets,placed in an ice-cooled chest,and transported to American EwArronmental Network laboratory <br /> (AEN)in Pleasant Hill, Offforna for chemical Snalyses. <br /> AEYs C.alrfarma DOEIS certnhcRtion number is 1172. Thee samples waA tm aiialyasd fOr the fallowing <br /> coustltnents. <br /> 1. be=WAM tnlueM ethylbet=ne,xylenes using U S Eavfra=ectal Prot L i n Agency <br /> WA) Metfzod S"L40,sample not filtered in the field; <br /> 2 total peuoleum hydrocarbons quantified as diesel MH-D) using regular modified <br /> EPA Method 8015,bample not IIteread in the Geld, <br /> 3 TPH-D Being modTwd FPA Method 8015,sample filtered to the field;and <br /> Gleamarta-ix taaesa flan=, Ono- <br /> Engineers,Geo6gow and Envmnmentai 5amms <br /> I <br /> I <br />