SITE INFORMATION AND CORRESPONDENCE

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San Joaquin County DIRECTOR Donna Heran,REHS '" Environmental Health Depr�artment �4 _ ,� Cp M ASSISTANT DIRECTOR ,2 600 East Main Street Laurie Cotulla,REHS Stockton, California 95202-3029 PROGRAM COORDINATORS Mike Huggins, REHS,RDI Margaret Lagorio, REHS cq� Fo'Ra c Website: www.sjgov.org/ehd RobertMcClellon, REHS Phone: (209)468-3420 Jeff Carruesco, REHS, RDI Fax: (209) 464-0138 Kasey Foley, REHS May 12, 2009 Ms. Catherine Kahler s JM Equiment Co Inc. vI 819 S. 91?H St. Modesto, CA 95351 rGT\� 7Ib�9 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 April 16, 2009, submitted by your consultant, Geological Technics Inc. (GTI), and received on Geotracker on April 20, 2009. The original work plan was submitted to address residual soil mass and delineation concerns raised by the EHD at the meeting held on September 17, 2008. Since that time GTI has evaluated cost savings methods and concluded that using Geoprobe push point boring instead of using Cone Penetrometer Testing (CPT) would provide similar data at a significant cost reduction. Nine Geoprobe borings are proposed and up to six `contingency' Geoprobes may be advanced if field screening indicates they are needed to further define the petroleum impact. The EHD has evaluated the new Plan and concurs. The plan to use Geoprobe boring instead of CPTs is adequate and approved. [H&S Code 25296.10(c)(3)]. The EHD has received and processed the Well Permit Application and the date you requested to start the work, May 27, 2009 is acceptable. If contingency boring(s) are needed east of Geoprobe 4, 7, or 9, an access agreement and an additional application and fee will be needed to install contingency Geoprobes C- 2, C-3, and/or C-6 at 1145 W. Charter Way. The report of findings for this phase is to be in the format of an updated site conceptual model (SCM) and should be on Geotracker within 60 days of the last Geoprobe boring installation. Please consolidate all GTI soil data into one table that includes all of the boring, push point, and well installation soil data. Soil iso- concentration maps are to be included for all constituents of concern. The updated feasibility study is to be included in the SCM also.