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x� <br /> rte•.�'�� .�2:,�';� '�'' � � � <br /> ALIG29Mil <br /> '4.--P,_1 1'i <br /> GROUNDWATER <br /> T^CHl'IVLOGY7 "• ltt}11iai.ardIin e.Suite]Oil,11'eStsacramentip.C195ti91.1`tle,137'd4746 <br /> PAN�911;0 12-8781 <br /> Project No.02320 1456 <br /> August 21, 1991 <br /> Mr. Michael C. Rabith <br /> Project Engineer <br /> Golden Grain Company <br /> 1111 -139th Avenue <br /> San Leandro,CA 94578 <br /> RE: FIRST QUARTER 1991 GROUNDWATER MONITORING RESULTS <br /> MANTECA BEAN FACILITY <br /> 229 MOFFAT BOULEVARD <br /> MANTECA,CALIFORNIA <br /> Dear Mr. Rabith: <br /> As required by San Joaquin County PublicHe�ait Health <br /> subjervicese t este for the first quarter 1991 onrtment, Groundwater lrAprill IS, <br /> completed groundwater monitoring and sampling <br /> 1991. The methods and ges ltss d Fig monitoring <br /> respectively.re .lmented below. <br /> A Site Location Map and a Site <br /> t Plan are attached as Figure <br /> Monitoring Well Gauging ollection on April 18, 1991, Groundwater Technology personnel <br /> Prior to well purging and water sample c <br /> and MW-4 were dry. The well <br /> gauged monitoring yells MW-2,and eW-S�oroi to nM wellstMW-1 determine depth to water and the dept <br /> to separate-phase petroleum, 9 p g <br /> gauging was conducted in accordance with Groundwater Technology's standard operating procedure(SOP) <br /> . <br /> A Well Monitoring Farm which converts the gauging data to water table elevations is alta ed 3]e water <br /> table elevations for April 1 B, 1991 were used to prepare the Potentiometric Surface Map (Figure <br /> Monitoring Well Sampling to GTEL Environmental <br /> Subsequent to well gal under samples8we�re lsubm'tted under aechain-of-custfody the monitoring wells in <br /> accordance with SOPS. EPA a roved <br /> Labo.atorics in Concord (GTEL), California. Each water sample was analyzed G)beyzene, <br /> toluene, <br /> ethylbenzene and xylenes(BTEX),and total petroleum hydrocarbons-as-gasoline CT and EDB by <br /> methcd 8020/8015,organic lead by LUFt instate methods,total perform these ead by EPA ana method <br /> 1The analy!Ical <br /> EPA method 504. GTEI. Is certified by the state of California to p <br /> entration of TPFt-G dissolved in groundwater is illustrated in Figure <br /> laboratory reports ars attached. The conc <br /> ----- -- --- --- - - 4,and the concentration of dissolved benzene is illustrated in Figure 5.in any wells, 3. both lead, usually considered <br /> to be derivedfromleaaedegasoline, was <br /> and detected <br /> et MW-�eTotai lead was detected in MW-2.cMW 5 MW-6aand <br /> gasoline additive,was <br /> MW-7, <br /> offices rhnnrahuur the C'.S•,Canada and Orcr 05 <br />