SITE INFORMATION AND CORRESPONDENCE

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t c %MOO V San Joaquin County Environmental Health Department D,REDonna naH Hesan, RENS 600 East Main Street a• Stockton California 95202-3029 PROGRAM COORDINATORS N. { Robert McClellon,REHS • =• Jeff Carruesco,REHS,RD] �'q -�--•��P Website: www.sjgov.org/ehd Kasey Foiey, REHS �ifio•R Phone: (209) 468-3420 Fax: (209)464-0138 March 3, 2010 Ms. Beverly Garcia Raymond Investment Corporation Post Office Box 567 Stockton, California 95201 Subject: Raymond Investment Corporation 730 Channel Street Stockton, California 95202 Dear Ms. Garcia: The San Joaquin County Environmental Health Department (EHD) has reviewed Revised Additional Vapor and Groundwater Monitoring Well Work Plan (revised work plan), dated January 15, 2010, submitted by Condor Earth Technologies, Inc. (Condor) on your behalf. The work plan was prepared in response to letters dated May 12, 2009, and October 8, 2009, from the EHD, and electronic communications between Condor and the EHD dated January 6, 2010. In the revised work plan, Condor proposes to install six groundwater monitoring wells, three soil borings, and three soil gas wells at locations illustrated on Figure 3, and collect soil, groundwater, and soil gas samples for analysis. The purpose of this investigation is to delineate the vertical and lateral extent of groundwater and soil contamination at the identified source of contamination and down-gradient northeast of the source area and evaluate the potential for vapor intrusion into the structures at the site. Most of the proposals in the work plan, Additional Vapor and Groundwater Monitoring Well Work Plan, dated August 4, 2009, were approved with conditions by the EHD by letter dated October 8, 2009. In the revised work plan, Condor concurs with the recommendations and conditions presented by the EHD, and the revisions approved by the EHD, are presented below: • Monitoring well MW-4D will be installed with a screen interval between approximately sixty and seventy feet below surface grade (bsg); • Monitoring well MW-5 will be installed with a vertical borehole, screened between approximately twenty-five and forty-five feet bsg. Soil samples will be collected at five-foot intervals and samples collected at 5, 15, 25, 35, and 45 feet bsg, as well as samples selected based on field observation, will be analyzed by a State of California certified laboratory;