SITE INFORMATION AND CORRESPONDENCE

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San Joaquin County DIRECTOR o iN Donna Heran, REHS Environmental Health Department ASSISTANT DIRECTOR 600 East Main Street Laurie Cotulla, REHS ' Stockton , California 95202-3029 PROGRAM COORDINATORS Carl Borgman, REHS p . . . p Mike Huggins, REHS, RDI Website: www.Sjgov.org/ehd Margaret Lagorio, REHS Phone: (209) 468-3420 Robert McClellon, REHS Fax: (209) 464-0138 Jeff Carruesco, REHS, RDI Kasey Foley, REHS November 18, 2008 Mr. David Atwater Van De Pol Enterprises, Incorporated Post Office Box 1107 Stockton, California 95201 Subject : Pacific Pride — South El Dorado Street 3147 South El Dorado Street Stockton, CA 95206 The San Joaquin County Environmental Health Department (EHD) has reviewed comments prepared and submitted by Advanced GeoEnvironmental, Inc . (AGE) by letter dated October 27, 2008, that addressed recommendations by the EHD presented by letter dated July 25, 2008 . The EHD had recommended installing a monitoring well south of MW-9 on the west side of South El Dorado Street and another monitoring well down gradient of MW-9 on the east side of South El Dorado Street to replace a monitoring well proposed by AGE to be installed in the middle turn lane of South El Dorado Street. Although the EHD continues to have safety concerns about installing a monitoring well in the middle tum lane of South El Dorado, at the insistence of AGE, the EHD will approve the installation of monitoring well MW- 13 in the middle turn lane as illustrated in Figure 2 of Additional Assessment & SVE Feasibility Testing Work Plan — June 2008, dated July 1 , 2008 . Soil samples will be collected at five-foot intervals beginning at ten feet below surface grade (bsg) and MW- 13 will be screened between twenty and forty feet bsg. Analyze selected soil samples for 1 ,2-dibromoethane (EDB) and tertiary butyl alcohol (TBA), in addition to analyzing for total petroleum hydrocarbons (TP1I) quantified as gasoline (TPH-g), kerosene (TPH-k), and diesel (TPH-d); benzene, toluene, ethyl benzene, and total xylenes (BTEX); methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), di-isopropyl ether (DIPE), and 1 ,2-dichloroethane ( 1 ,2-DCA). The EHD had also recommended installing a monitoring well down gradient of MW-10 on the east side of South El Dorado Street to laterally define the 1 ,2-DCA plume. AGE responded that an additional well down gradient of MW- 10 is not warranted at this time based on the belief that the 1 ,2-DCA plume is stable, MW- 10 is located at or near of the margin of the plume, and the plume will recess or degrade once remediation has been implemented. The EHD will evaluate the results of the impending implementation of site remediation and will not pursue the installation of additional monitoring wells in the areas of MW-9 and MW- 10 at this time. Please be aware that delineation of the 1 ,2-DCA plume may be an issue with the Central Valley Region Water Quality Control Board when the site is proposed for closure.