SITE INFORMATION AND CORRESPONDENCE_PRE 2019

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1.0 INTRODUCTION The U.S. Environmental Protection Agency (EPA), Region a, under the authority of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) and the Superfund Amendments and Reauthorization Act of 1986 (SARA), has tasked Bechtel Environmental, Inc. (BE!) to conduct a preliminary assessment (PA) of the Marlowe Property (Marlowe) site in Stockton, San Joaquin County, Calif. The purpose of the PA is to review existing information on the site and its environs to assess the threat(s), if any, posed to public health, welfare, or the environment and to determine if further investigation under CERCLA/SARA is warranted. The scope of the PA includes the review of information available from federal, state, and local agencies and performance of an onsite reconnaissance visit. Using these sources of existing information, the site is then evaluated using the EPA's Hazard Ranking System (HRS) criteria to assess the relative threat associated with actual or potential releases of hazardous substances at the site. The HRS has been adopted by the EPA to help set priorities for further evaluation and eventual remedial action at hazardous waste sites. The HRS is the primary method of determining a site's eligibility for placement on the National Priorities List (NPL). The NPL identifies sites at which the EPA may conduct remedial response actions. This report summarizes the findings of these preliminary investigative activities. The Marlowe site was identified as a potential hazardous waste site and entered into the Comprehensive Environmental Response, Compensation, and Liability Information System (CERCLIS) on January 19, 1995 (CAO 001009760) (1). The site was entered into CERCLIS based on a referral by the San Joaquin County, Environmental Health Division (EHD) (2). 1.1 Apparent Problem The apparent problems at the site are as follows: • Between 1988 and 1994, analytical results of groundwater samples collected from onsite monitoring wells have indicated the presence of total petroleum hydrocarbons (TPH), benzene, toluene, ethylbenzene, xylene, (BTEX), and halogenated volatile organic compounds (HVOCs), (3,4). • In 1993, analytical results of groundwater samples collected from an onsite domestic well indicated the presence of HVOCs including 1,1-dichloroethane (1,1-DCA), 1,1-dichloroethene (1,1-DCE), and trichloroethene (TCE). (5) 2.0 SITE DESCRIPTION 2.1 Location The Marlowe site is located at 4630-4648 Waterloo Rd. in Stockton, San Joaquin County, Calif. The geographic coordinates of the site are 37° 59' 20.5" N latitude and 121° 13' 29.0" W longitude PA Marlowe Property-SS • 6/95 1 Printed on 50% recycled paper.