SITE INFORMATION AND CORRESPONDENCE FILE 2

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U IN San Joaquin County ° f �o Environmental Health Department G DIRECTOR 1868 East Hazelton Avenue Donna Heran, REHS Q: a Ak '7. Stockton, California 95205-6232 PROGRAM COORDINATORS Robert McClellon, REHS / Jeff Carruesco, REHS,RDI c9<iko'aWebsite: www.sigov.org/ehd Kasey Foley, REHS Phone: (209) 468-3420 Linda Turkatte, REHS Rodney Estrada, REHS Fax: (209) 464-0138 Adrienne Ellsaesser, REHS November 6, 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: The San Joaquin County Environmental Health Department (EHD) has received and reviewed Site Assessment Work Plan (Work Plan) dated 10 October 2014, prepared and submitted by your consulting firm, Donan Environmental Services, Inc. (DES) on your behalf for the above- referenced site. By letter dated 9 September 2014, the EHD had directed the submittal of a work plan to install additional wells to delineate the horizontal extent of the petroleum hydrocarbon-impacted groundwater plume down-gradient (northeast) of the two former underground storage tank (UST) areas. In the Work Plan DES proposes: • Advancement of two borings using ten-inch-diameter hollow-stem augers in the right-of- way on the west side of South EI Dorado Street and one boring using eight-inch- diameter hollow-stem augers in the right-of-way on the east side of South EI Dorado Street and conversion of the borings into monitoring wells DW-6, DW-7 and DW-8 by a drilling company with an active California C-57 contractor's license at locations illustrated on Figure 16 of the Work Plan; • Utility clearance by Underground Service Alert and a private utility service company prior to advancement of the three borings and "air-knifing" with vacuum application while installing the three wells; • Collection of soil samples at five-foot intervals, from five feet below surface grade (bsg) to fifteen feet bsg and continuous core samples from approximately twenty to thirty-five feet bsg for lithologic evaluation. • Field inspection of collected soil samples for the presence of petroleum hydrocarbon staining and volatile organic compound odors using an organic vapor meter, and chemical analysis of selected soil samples; • Selection and preservation of up to five soil samples from the continuous core for chemical analysis by a California State-certified laboratory with a total of approximately eight soil samples from each boring;