SITE INFORMATION AND CORRESPONDENCE FILE 2

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San Joaquin County .C` Environmental Health Department DIRECTOR 1868 East Hazelton Avenue Donna Heran, REHS e' PROGRAM COORDINATORS Stockton, California 95205-6232 Robert McClellon, REHS Jeff Carruesco, REHS,RDI Cq •.._ Website: www.sjgov.org/ehd Foley, RENS �r F 0 o R Linda Linda Turkatte,REHS Phone: (209) 468-3420 Rodney Estrada,REHS Fax: (209) 464-0138 Adrienne Ellsaesser,REHS September 9, 2014 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: During a meeting on 8 September 2014, attended by you, Anderson Donan and Greg Delson of Donan Environmental Services, Inc. (DES), and Nuel Henderson and Vicki McCartney of the San Joaquin County Environmental Health Department (EHD), it was decided that additional monitoring wells were needed to delineate the horizontal extent of the petroleum hydrocarbon contaminant plume northeast of the above-referenced site and down-gradient of monitoring well MW-2. Please submit a work plan to the EHD by 10 November 2014 that addresses the installation of three additional monitoring wells. Include the proposed frequency of sampling the groundwater in the three proposed wells (the EHD prefers that newly-installed wells be sampled quarterly for one year only), and list the analyses to be performed on the groundwater collected from the newly-installed monitoring wells. By letter dated 30 October 2013, the EHD directed that groundwater from monitoring wells MW-1 through MW-5 be analyzed for lead and naphthalene during the next sampling event. Except for groundwater collected from MW-1 and analyzed for naphthalene, lead and naphthalene analytical data were not reported for groundwater samples collected during the February 2014 sampling event. You are now directed to analyze groundwater for lead and naphthalene collected from all of the wells during the next scheduled sampling event. As first stated by letter dated 30 October 2013, for case closure concurrence, the Central Valley Regional Water Quality Control Board (Regional Board) requires that if soil samples were not analyzed for specific contaminants during the removal of waste oil tanks, then groundwater samples must be collected near the site of the former waste oil tank and analyzed for selected contaminants listed in Table 2 of Appendix A of the Tri-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Storage Tank Sites. To this end, EHD directs that during the next sampling event only, analyze groundwater from monitoring well MW-2 for total petroleum hydrocarbons as gasoline (TPH-g); total extractable hydrocarbons as diesel (TPH-d); total extractable hydrocarbons as motor oil (TPH-mo); the entire suite of method 8260B compounds that must include: benzene, toluene, ethylbenzene, total xylenes (BTEX);