SITE INFORMATION AND CORRESPONDENCE

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C) San Joaquin County DIRECTOR PQY.!!V Environmental Health Department Donna Heran,REHS SCO G ASSISTANT DIRECTOR 600 East Main Street Laurie Cotulla, REHS Stockton, California 95202-3029 PROGRAM COORDINATORS I 1 Carl Borgman,REHS Webse: www.sjgov.org/ehd Mike Huggins,REHS, RDI it r F o R Margaret Lagorio,REHS Phone: (209)468-3420 Robert McClellon,REHS I Fax: (209)464-0138 ,left Carruesco, REHS,RDI o June 12, 2008 Kasey Foley, REHS Joseph Rokoszewski R & L Diesel Service Inc. 2015 W. Harding Way Stockton, CA 95203 Subject: R & L Diesel SITE CODE: 0001694 Stockton, CA West Lane SITE #: 39000 k a The San Joaquin County Environmental Health Department (EHD) has reviewed the "Report of Investigation" (Report) dated May 18, 2008, prepared by Environeering, Inc. for the above subject site and provides the following comments. In a letter dated July 20, 2007, the EHD informed you that further investigation of contamination found beneath the former waste oil underground storage tank (UST) was required,. that the California Regional Water Quality Control Board, Central Valley Region 'Appendix A - Reports Tri-Regional Board Staff Recommendations For Preliminary Investigation and Evaluation of Underground Tank Sites" (Tri-Regional Guidelines) should be used as a guidance document, and that all work and reports which require geological or engineering evaluations must be performed under the direction of an appropriately California registered or certified professional. An appropriately California registered or certified professional for the work performed and report prepared for your site would be either a Professional Geologist (PG) or a Professional Engineer, Civil (PE Civil) according to the California Business and Professions Code and the Board of Geologists and Geophysicists. Although, the report was reviewed by Thomas E. Ballard, PG, there are no statements that indicate he was in responsible charge of the work and report that were completed by Guy Roy, a Professional Engineer, Chemical, who does not have the appropriate registration to have responsible professional charge for the work and report preparation. The EHD informed Mr. Roy of this requirement prior to performance of the work, so he resubmitted the work plan signature page with Thomas Ballard's stamp and signature on it. The EHD interpreted this to mean Mr. Ballard was in responsible charge of the work to be performed and the report to be prepared. The drawings/measurements in the Report are not consistent with the EHD information � lkr (observed and provided) noted during performance of the work. According to the EHD ?field notes there were four push point borings advanced on March 6, 2008.. The first boring. was vertical and placed about four feet north of the former UST. The. EHD was informed that this boring. reached a total depth of 43 feet when the equipment could no longer push the probe and that the soil from the boring appeared "clean" to total depth. Since the work plan had proposed collecting a water sample and groundwater was not encountered, a second vertical boring was