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r <br /> MONITORING AND REPORTINOROGRAM NO. R5-2015-0810CaE <br /> y_ . <br /> FORMER OCCIDENTAL CHEMICAL CORPORATION FACILITY, LATHRO1lvEi <br /> SAN JOAQUIN COUNTY <br /> Table 1 JUL d 24 2015 <br /> Sampling locations,Analytes,and Sampling Frequency'2,1 <br /> 1wA11150MIAh <br /> - -4 v I e . ! IS t ML <br /> volume F-`= IV-;^'7DR'7T.SCgiT <br /> Injected, <br /> Rate <br /> Injected, Total Nitrate, <br /> OC&OP Injection BHC Dissolved Chloride, <br /> Sampling Location I EDB. I DBCP Sulfoiane I Pesticides Pressure Isomers Herbicides Solids Sulfate <br /> All wells shall be monitored semi-annually for water levels. <br /> 2 Wells that are sampled semi-annually shall be sampled during the first and third quarters. , <br /> 3 Wells that are sampled annually shall be sampled during the third quarter, <br /> In the event the Discharger begins injecting into the INJ-14,EW-04 shall be sampled quarledy. If sulfolane,EDB,and DBCP concentrations show stable to <br /> decreasing trends,the sampling frequency for these analytical suites may be reduced to annual sampling with Central,Valley Water Board staff concurrence. <br /> s If sulfolane,EDB,and/or DBCP are not detected in the monitoring wells above the reporting limit for four consecutive routine quarterly sampling <br /> events,or the concentrations show stable to decreasing trends,the sampling frequency for these analytical suites may be reduced to semi-annual <br /> sampling for that well with Central.Valley Water Board staff concurrence. <br /> e If BHC isomers,OC and OP pesticides,and herbicides are not detected in the monitoring wells above their respective reporting limits for <br /> four consecutive routine quarterly sampling events,these analytical suites may be removed from the schedule for the well(s)with <br /> Central Valley Board staff concurrence.However,the City of Lathrop or any other municipal well(s)shall be sampled semi-annually. <br /> 7 After four consecutive routine quarterly sampling events,if concentrations of these constituents show stable trends,then these analytical suites <br /> may be reduced to annual sampling with Central Valley Water Board staff concurrence. <br /> BAfter four consecutive routine quarterly sampling events,if nitrate,chloride,sulfate,or total dissolved solids(TDS)concentrations show stable to decreasing trend: <br /> then these analytical suites may be reduced to annual sampling with Central Valiey Water Board staff concurrence. <br /> 9 The treatment system effluent sampling results may be used to satisfy this requirement as all treated water is discharged through injection wells. <br /> All current and future injection wells may be removed from this Site-wide MRP and added to's revised WDR MRP for the Site's.groundwater remediation_system <br /> upon concurrence from staff at the Central Valley Water Board. <br /> New injection wells screened below the corcoran clay will be used to continuously monitor total volume,injection rate,and injection pressure.New injection <br /> wells screened above the corcoran clay will be used to continuously monitor total volume and injection rate,and injection pressure. <br /> pH,Temperature and Conductivity shall be measured whenever a sample is submitted for laboratory analysis <br /> EDB=Ethylene Dibromide <br /> DBCP=1,2-Dibromo-3-chloropropane <br /> OC Pesticides=Organochlorine Pesticides <br /> OP Pesticides=Organophosphorus Pesticides <br /> Organochlorine Pesticides=Aldrin,Chlordane,DDD,DDE,DDT,Dieldrin,Heptachlor,Toxaphene <br /> Organophosphorus Pesticides=DEF,Delnav,Dimethoate,Ethyl Parathion,Methly Parathion,Disyston <br /> BHC Isomers=Benzene Hexachloride(alpha,beta,delta,and gamma isomers) <br /> Herbicides=2,4-D(Dichlorophenoxyacetic acid)and 2,4,5-T(Trichlorophenoxyacetic acid) <br /> --=Not Required or Not applicable <br /> M=monthly sampling frequency <br /> Q=quarterly sampling frequency <br /> S=semi-annual sampling frequency <br /> A=annual sampling frequency <br /> Page 4 of 4 <br />