SITE INFORMATION AND CORRESPONDENCE FILE 2

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San Joaquin County Environmental Health Department DIRECTOR r i 1868 East Hazelton Avenue Linda Turkatte, REHS Stockton, California 95205-6232 PROGRAM COORDINATORS 1C Robert McClellon, REHS �. — -- -- - Jeff Carruesco, REHS,RDI Ci4C` .. ri�P Website: www.sjgov.org/ehd Kasey Foley,RENS FOR - Rodney Estrada, REHS Phone: 209 ( ) 4683420 Adrienne Ellsaesser, REHS Fax: (209) 464-0138 June 16, 2015 EI Dorado Land Holdings, LLC Mr. Allen L. Genetti CPA, CFO Post Office Box 6632 Stockton, California 95206 Subject: California Tank Lines, Inc. 3105 South EI Dorado Street Stockton, California 95206 Dear Mr. Genetti: The San Joaquin County Environmental Health Department (EHD) has received and reviewed Site Assessment Work Plan (Work Plan) dated 26 May 2015, prepared and submitted by your consulting firm, Donan Environmental Services, Inc. (DES) on your behalf for the above- referenced site. The EHD had directed the submittal of a work plan during a conference call on 15 May 2015 during which DES proposed to advance an additional boring to identify product- bearing zones in the subsurface and install a monitoring well northwest of the source area. In the Work Plan DES proposes: • Initially, to advance one continuous core soil boring, MW-9, for lithologic evaluation, adjacent to and south of monitoring well MW-2 using six-inch-diameter hollow-stem augers to identify product-bearing depths and product impacts to groundwater from five feet below surface grade (bsg) to approximately seventy feet bsg; if, and only if soil staining, petroleum hydrocarbon odor or elevated measurements using a photo- ionization detector (PID) are detected that indicate free product in soil deeper than fifty feet bsg, then over-drill the pilot boring with ten-inch-diameter augers and install monitoring well MW-9 with a four-inch-diameter well casing, screened at an anticipated depth of approximately fifty and seventy feet bsg; • Install a second monitoring well, MW-10, using ten-inch-diameter augers with a four- inch-diameter well casing, west/northwest of MW-2 as illustrated on Figure 9 of the Work Plan; collect soil samples at five-foot intervals from five to fifteen feet bsg, collect continuous core soil samples between twenty and thirty-five feet bsg and possibly additional depth intervals based on findings from advancing MW-9; otherwise, collect soil samples at five-foot intervals below thirty-five feet bsg; the total depth and twenty-foot screened interval proposed for MW-10 will be based on targeting the product-bearing zones identified in the initial continuous core borehole of MW-9;