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l/ <br /> ,�Ti��tTUS r WED <br /> � <br /> ENVIRONMENTAL INC 3330 Cameron Park Drive Ste 550 <br /> DEC 1 0 2001 Cameron Park California 95682 <br /> (530)676-6004-Fax (530)676-6005 <br /> U, ' 1 ' ,Ci'IT HEALTH <br /> F,_ TJ,.ERVrL1ES November 30, 2001 <br /> Project No 2005-2050-01 <br /> Ms Lon Duncan <br /> San Joaquin County Public Health Service <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Fourth Quarter 2001 Quarterly Monitoring Report for the Former Apache Plastics <br /> Facility Located at 2050 East Fremont Street, Stockton, California —� <br /> Dear Ms Duncan <br /> On behalf of Beasley and Associates L P , Stratus Environmental, Inc (Stratus), has <br /> prepared this report documenting the results of the fourth quarter 2001 groundwater <br /> monitoring event conducted at the former Apache Plastics facility, located at 2050 East <br /> Fremont Street, Stockton, California (Figure 1) This report presents groundwater <br /> . clevations measured in onsite and offsite groundwater monitoring wells, groundwater <br /> flow direction and gradient, and analytical results of groundwater samples collected <br /> during the fourth quarter 2001 monitoring event <br /> BACKGROUND <br /> The subject site is located in a mixed commercial/residential neighborhood in east-central <br /> Stockton and was formerly used to manufacture plastic products Topography in the area <br /> is flat, with a surface elevation of approximately 22 feet above mean sea level The <br /> property was sold to Henderson Construction, Inc in 1998 <br /> Information previously gathered during a file review at the San Joaquin County <br /> PHS/EHD in August 1988 showed that Precision Industries, Inc observed the removal of <br /> one 1,000-gallon underground storage tank (UST) The UST was installed in 1976 in the <br /> northern portion of the facility A soil sample was collected from beneath the UST at <br /> approximately 9 feet below ground surface (bgs) Total petroleum hydrocarbons as <br /> gasoline (TPHG) and benzene were detected at concentrations of 3,400 parts per million <br /> (ppm) and 61 ppm, respectively <br /> Between August 1989 and December 1993, Western Geologic Resources, Remediation <br /> Services, Inc , and BSK and Associates performed additional subsurface investigations <br /> A total of eleven soil borings were drilled and converted to seven groundwater <br /> . monitoring wells (MW-1 through MW-7), two vapor extraction wells (VEW-1 and <br /> VEW-2), and two manometers (MP-1 and MP-2) Well locations are shown on Figure 2 <br /> i <br />