SITE INFORMATION AND CORRESPONDENCE

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San Joaquin County DIRECTOR QD , N Donna Heron, RENS O.P C Environmental Health Department ASSISTANT DIRECTOR r 2 600 East Main Street Laurie Cotulla, REHS Stockton , California 95202-3029 PROGRAM COORDINATORS Carl Bergman, REHS c ' • . P Mike Huggins, REHS, RDI fro Phone:, Website: www.sjgov. org/ehd Margaret Lagorio, REHS Phone: (209) 468-3420 Robert McClellon, REHS Fax: W) $6&-0)( Jeff Carruesco, REHS, RDI Kasey Foley, REHS BILL STOERMER LAWRENCE BEASLEY FREMONT PLAZA INVESTMENTS APACHE PLASTICS 7015 MORTON COURT 2120 PEBBLE DRIVE STOCKTON CA 95205 ALAMO CA 94507 RE : Former Apache Plastics SITE CODE : 2313 2050 Fremont Street Stockton CA 95209 San Joaquin County Environmental Health Department (SJC/EHD) has reviewed Additional Site Assessment Work Plan (Work Plan) dated November 14, 2007, submitted on your behalf by Advanced GeoEnviron mental , Inc. (AGE) and has the following comments . In the Work Plan AGE proposes the locations for one confirmation soil boring, one shallow and one deep groundwater monitoring well and one groundwater extraction well ; describes the performance of a groundwater pumping test and the collection of soil and groundwater samples to conduct an ozone infusion bench scale test. As directed by SJC/EHD in correspondence dated September 26 , 2007, the proposed confirmation soil boring will be located near VEW- 1 , in the area of the former underground storage tank ( UST) . The boring will be advanced by direct push method , to estimated total depth of 65 feet below surface grade (bsg) . Soil samples for analysis will be collected at five foot intervals . AGE outlines in the Work Plan procedures for the installation of one shallow groundwater monitoring well built to total depth of 55 feet bsg with a 15-foot screen interval to intercept first groundwater, one deep screened groundwater monitoring well built to total depth of 122 feet bsg with a 10-foot screen interval and one groundwater extraction well built to total depth of 122 feet bsg with a 20-foot screen interval . AGE proposes to collect soil samples at five foot intervals during the drilling of the pilot borings for these wells. SJC/EHD recommends the borings for the two deep screened wells be continuously cored at depth to ensure placement of the screen over an appropriate permeable interval . AGE proposes conducting an 8-hour step drawdown pumping test, and to use the results of this test to design and perform a 24-hour constant rate pumping test on the extraction well . The purpose of the pumping tests is to determine the feasibility of using groundwater extraction as a remedial alternative at the site by determining the radius of influence , hydraulic conductivity, storativity, transmissivity and drawdown potential of the aquifer.