SITE INFORMATION AND CORRESPONDENCE

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San Joaquin County DIRECTOR Donna Heran, REHS Environmental Health Department r+ ASSISTANT DIRECTOR 600 East Main Street Laurie Cotulla, REHS Stockton, California 95202-3029 PROGRAM COORDINATORS Carl Borgman,REHS Mike Huggins, REHS,RDI Website: www.sjgov.org/ehd Margaret Lagorio,REHS c'Po R� Phone: (209) 468-3420 Robert McClellon, REHS Fax: (209) 464-0138 Jeff Carruesco,REHS,RDI Kasey Foley, REHS March 24, 2009 rGT3/A5 Catherine Kehler JM Equipment Co Inc. 819S. 9TH St. Modesto, CA 95351 Subject: JM Equipment RO#: 297 1245 W. Charter Way CUF#: 12607 Stockton, CA. 95206 Geotracker ID#: T0607700794 The San Joaquin County Environmental Health Department (EHD) has reviewed Additional Site Characterization Work Plan (Plan) dated January 16, 2009, submitted by your consultant, Geological Technics Inc. (GTI), and received on Geotracker on February 6, 2009. The Plan was submitted to address residual soil mass and delineation concerns raised by the EHD at the meeting held on September 17, 2008; the issues needed to be addressed to facilitate the EHD review of your corrective action proposal. The plan proposes installation of 19 Cone Penetrometer Testing (CPT) borings to 40 feet below ground surface ('bgs) or deeper if field conditions indicate additional vertical investigation is warranted. The EHD has evaluated the most current ground water data (November 6, 2008) and the soil data collected to date and believes that much of the information needed could be gathered from much fewer than the 19 CPTs proposed; the remaining CPTs could be contingency borings that could be instilled if justified by data from the initial CPTs installed in the area that indicates the 'step-out' borings would further help to define the extent of the contamination. The CPTs that the EHD approves initially are as follows: • CPT -1, CPT-5, and CPT-11; any significant soil contamination noted in these borings should be followed up with contingency borings CPT-2, CPT-6, and CPT- 12, respectively. • CPT-16, CPT-17, and CPT-19 could be combined into one CPT boring in the CPT-16 location with a contingency boring further south/southeast if indicated. • CPT-9 and CPT-14; contingency lateral borings CPT-8 and CPT-13 can be placed if significant contamination is noted in CPT-9 & 14. • CPT-7. The area immediately north and northwest of CPT-7 should be investigated, but was not included in this proposal. If it is not possible for the CPT rig to access this covered area, then an additional CPT should be installed on the north side of the covered area.