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r { <br /> rAdditional Site Assessment Work Plan and Site Conceptual Model <br /> MARLOWE PROPERTIES <br /> r4696 East Waterloo Road (Formerly 4648 East Waterloo Road), Stockton, CA <br /> r1.0. INTRODUCTION <br /> At the request of Mr Jonathan Marlowe of Marlowe Properties,Advanced GeoEnvironmental,Inc <br /> r (AGE) has prepared this work plan and site conceptual model for 4696 East Waterloo Road <br /> (formerly 4648 East Waterloo Road), Stockton, California The scope of work includes the <br /> installation of three monitoring wells to define the lateral and vertical extent of <br />' 1,2 dichloroethane(DCA)impacted ground water The location of the site is illustrated on Figure 1 <br /> A plan of the site is illustrated on Figure 2 <br />' The San Joaquin County Environmental Health Department (EHD) has directed by letter dated <br /> 05 January 2005 that a work plan be prepared to define the limits of the 1,2-DCA-impacted <br />' groundwater at the site This work plan has been prepared in accordance with Central Valley <br /> Regional Water Quality Control Board (RWQCB) guidelines for the investigation of underground <br /> storage tanks (UST) sites <br /> r <br /> 1 1 HISTORICAL BACKGROUND <br /> On 04 January 1988, one 550-gallon gasoline underground storage tank (UST) was removed from <br /> the site Soil samples collected beneath the UST contained substantial concentrations of total <br /> petroleum hydrocarbons quantified as gasoline (TPH-g) <br /> 1 1 1 Site Assessment Milestones <br /> On 07 July 1988, one soil boring (B-1) was advanced northwest of the former UST area to 34 feet <br /> below surface grade (bsg) and one ground water monitoring well (B-2/MW-1) was installed to 80 <br /> feet bsg southwest of the former UST location Petroleum hydrocarbons were not detected in soil <br /> I samples collected from B-1, however, TPH-g was detected in both soil and ground water samples <br /> collected from MW-1 <br /> In December 1992,monitoring well MW-2 was installed southwest of the former UST area,to a total <br /> depth of 110 feet MW-2 was installed to replace well MW-1,which became dry due to decreasing <br /> ground water levels Petroleum hydrocarbons were not detected in soil samples collected during the <br /> construction of MW-2, however, benzene and halogenated volatile organic compounds (HVOCs) <br /> were detected in the initial ground water samples <br /> On 29 and 30 September 1993, ground water monitoring wells MW-3 and MW-4 were installed <br /> down-gradient of the former UST area to total depths of 100 and 105 feet, respectively Petroleum <br /> • hydrocarbons were not detected in selected soil samples, however bromomethane was detected in <br /> IAdvanced GeoEnvironmental,Inc <br />