Laserfiche WebLink
it <br /> ENVIRONMENTAL HEALTH i)EPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Donna K. Heron, R.E.H.S. Program Coordinators <br /> " Director 304 East Weber Avenue, Third Floor Carl Borgman, R.E.H.S. <br /> Laurie A. Cotulla, R.E.H.S. Stockton, California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> Assistant Director Margaret Lagorio, R.E.H.S. <br /> c FORK Telephone: (209) 468-3420 Robert Mcclellon, R.E.H.S . - <br /> Fax : (209) 464-0138 Jeff Carruesco, R.E.H.S. <br /> Website: www. sjgov.org/ehd/ Kasey Foley, R.E.H.S. <br /> MAR 0 2 2007 <br /> LAWRENCE H BEASLEY FREMONT PLAZA INVESTMENTS <br /> 2120 PEBBLE DRIVE 7015 MORTON COURT <br /> ALAMO CA 94507 STOCKTON CA 95205 <br /> RE : Former Apache Plastics SITE CODE : 2313 <br /> 2050 Fremont Street <br /> Stockton CA 95209 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed Well <br /> Installation and Destruction Report and Site Conceptual Model Update Addendum <br /> (Addendum) dated December 12, 2006 , submitted Stratus Environmental, Inc. (Stratus) <br /> on your behalf and has the following comments . <br /> Stratus states in the Addendum that they consider the contamination at this site to be <br /> adequately defined , and recommends preparation of a problem assessment/feasibility <br /> study report. <br /> Concentrations of petroleum hydrocarbon contamination in the groundwater are very high <br /> in the source area, both in shallow and deep-screened groundwater monitoring wells, and <br /> down gradient from the source area . The furthest down gradient well, MW-10, screened <br /> in a deeper zone, is impacted by benzene and 1 ,24chloroethane ( 1 ,2-DCA). The <br /> recently installed deep monitoring well , MW-14, located furthest upgradient relative to the <br /> onsite source area , is impacted by total petroleum hydrocarbons as gasoline (TPHg) and <br /> benzene, though the concentrations appear to be declining . Additional lateral assessment <br /> is needed toward the east. The Regional Water Quality Control Board will not concur with <br /> closure of sites at which the 1 ,2-DCA is not fully defined . <br /> Discrete groundwater samples collected at depths greater than 120 feet below surface <br /> grade (bsg ) from cone penetrometer test (CPT) borings in the source area were non- <br /> detect except for 0. 94 micrograms per liter (µg/1) toluene and 0. 90 µg/I xylenes in CPT-1 <br /> at approximately 130 feet bsg . Based on the CPT data, the groundwater contamination <br /> appears to be mostly vertically defined at approximately 120 feet bsg . Soil contamination <br /> is still present in the saturated zone soil . Soil vapor extraction remediation conducted <br /> from 1994 through 1996 appears to have removed most shallow vadose zone soil <br /> contaminants in the source area . <br /> Please proceed with preparation and submittal of a feasibility study that compares at least <br /> two alternatives for cost and effectiveness addressing the contamination remaining at this <br /> site. Include in the report a work plan to complete the site investigation . The feasibility <br /> study is due for submittal no later than April 27 , 2007 . <br />