SITE INFORMATION AND CORRESPONDENCE FILE 1

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i San Joaquin County Environmental Health Department DIRECTOR Donna Heron, REHS s 1 600 East Main Street UY Stockton , California 95202-3029 PROGRAM COORDINATORS 'LL .. Robert McClellan , REHS _ Jeff Carruesco, REHS , RDI C'q . . . Website: wwwsjgov.org/ehd Kasey Foley, REHS C ( F � R Phone : (209) 468-3420 Fax: (209) 464-0138 March 3 , 2010 Mr. R. Ellis , Jr.. Ms . Ethyl D . Ellis , Trustee et alia 1991 West Lincoln Road Stockton , California 95207-2462 Subject: California Tank Lines, Inc. 3105 South EI Dorado Street Stockton, California 95206 Dear Mr. Ellis : The San Joaquin County Environmental Health Department (EHD) has .reviewed Soil Vapor Survey Report, Human Health Risk Assessment, and Additional Site Investigation Work Plan, dated January 25, 2010, prepared and submitted by Taber Consultants (Taber) on your behalf for the above-referenced site . In the work plan , Taber proposes to advance eight soil borings, GP- 1 through GP-8, to approximately fifty feet below surface grade (bsg) using Geoprobe® technology to assess the horizontal extent of petroleum hydrocarbons in soil and groundwater. The proposed boring locations are illustrated on Figure 4 of the work plan . Upon review of the historical analytical data, the EHD approves the advancement of three proposed off-site borings to the north and south of monitoring well MW-4. High concentrations of total petroleum hydrocarbons quantified as gasoline (TPH-g); benzene, toluene, ethylbenzene, and total xylenes (BTEX); and 1 ,2-dichlomethane (1 ,2-DCA) continue to be detected in groundwater collected from MW-4; and high concentrations of TPH-g, benzene, 1 ,2- DCA, and di-isopropyl ether (DIPE) were detected in grab groundwater samples collected at thirty-five feet bsg during the advancement of cone penetration test (CPT) boring P-2, located approximately eighty-five feet north of MW-4 . Based on these analytical results, additional investigation is needed to assess the lateral extent of contamination in the City of Stockton right- of-way, west of EI Dorado Street. During advancement of the three approved Geoprobe® borings, Taber proposes to collect soil for lithologic evaluation , while visually observing soil for the presence of petroleum hydrocarbon contamination and screening soil samples using a photo-ionization detector. Taber proposes to collect soil samples at ten-foot intervals and collect one grab groundwater sample from each boring at approximately thirty-five to forty feet bsg . Taber proposes to analyze soil and groundwater samples for TPH-g , TPH quantified as diesel (TPH-d ), TPH quantified as motor oil (TPH-mo), BTEX, and methyl tertiary-butyl ether (MTBE), in addition to reporting "concentrations of the ten tentatively identified compounds (TICs) of greatest concentrations which comprise the TPH detected in soil" and groundwater. Instead of reporting the ten TICs, the EHD recommends that the entire suite of 8260B compounds be reported .