Laserfiche WebLink
_ f <br /> se <br /> Y <br /> WORK PLAN <br /> FOR SOIL AND GROUNDWATER INVESTIGATION <br /> ARCO STATION 6080, LATHROP, CALIFORNIA <br /> This work plan has been prepared for ARCO Products Company(ARCO)to conduct a site <br /> investigation at ARCO Station 6080, located at 85 E. Louise Avenue, Lathrop, California. The <br /> work plan will be submitted to ARCO and the Sart Joaquin County Environmental Health <br /> Division (County). Before commencing work all necessary permits will be acruired from the <br /> County. Work will commence within 30 days upon approval of this work plan. This work plan <br /> has been prepared under Task Order 6080-92-2, Brown and Caldwell Consultants (BCC)job <br /> number 6661. <br /> A site investigation was performed at.this facility in 1987 after a waste oil tank had been <br /> removed. Six boreholes were drilled, and groundwater monitoring wells were installed in three <br /> of the boreholes (Figure 1). The results indicated that only minor concentrations of total <br /> petroleum hydrocarbons (TPH) were found in two soil samples [29 milligrams per kilogram <br /> (mg/kg)in AL1-1 and 10 mg/kg in AL5-2]. Hydrocarbon constituents were not detected in any <br /> other soil samples or in groundwater samples. Hydrocarbons were not detected in groundwater <br /> samples collected again in 1988. <br /> 1: PURPOSE <br /> Theof <br /> P se this work is to further,investigate whether trte soil and/or groundwater have <br /> been affected with hydrocarbons in the vicinity of the former waste oil excavation at ther <br /> site. r .w .w � i[tosrl will"6cn �}Y�- fir/, ode/cyt{ <br /> r _ _ <br /> byd �tA�d it�on y wa#eF, Z +dT i '�altecteii frvtrx"th�c �E <br /> hrotr�zcknigite LFA 1�shows t11d}a <br /> ed <br /> n <br /> hi 20T <br /> C� Ur1 Ata111t8tirl <br /> ` t FIELD METHODS <br /> J <br /> This section desMbes_the-field methods-for-this investigation. <br /> ! Bor•Ahole Drilling <br /> BCC will supervise.the drilling of two boreholEs at the site(see Figure 1). Boreholes will <br /> i be drilled using atruck-mounted drillingrig equipped�1� 6thdll <br /> � $adr�bgxtho�cillytt�` eda_.ap�'p'-'F.-'" y 2(},�et� la} ntta I <br /> Depth to <br /> - .x ,_r., rnatrmsstel vt� su1e(bis)`,.' <br /> �._h� 4 <br />