SITE INFORMATION AND CORRESPONDENCE FILE 1

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N San Joaquin County DIRECTOR Donna Heran, REHS Op,Q U._ N Environmental Health Department r ASSISTANT DIRECTOR 600 East Main Street Laurie Cotulla, REHS Stockton , California 95202-3029 PROGRAM COORDINATORS Mike Huggins, REFS, RDI • C`• . , ,,, ``P. • Website: WWW.S OV.Or /ehd Margaret Lagorio, REHS 4 � / kpaN 19 9 Robert McClallon, REHS Phone: (209) 468-3420 Jeff Carruesco, REHS, RDI Fax: (209) 464-0138 Kasey Foley, REHS June 12, 2009 i 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 El Dorado Street Stockton, California 95206 The San Joaquin County Environmental Health Department (EHD) has reviewed Soil Vapor Survey Work Plan Addendum, dated June 10, 2009, prepared and submitted by Taber Consultants (Taber) on your behalf for the above-referenced site. In the work plan addendum, Taber proposes to collect five soil gas samples on-site at approximately five feet below surface grade (bsg) at locations illustrated in Figure 3 of the work plan addendum. The EHD conditionally approves the work plan addendum with the following recommendations: • At least one foot of dry granular bentonite instead of dry bentonite pellets should be emplaced on top of the sand pack followed by emplacing hydrated bentonite grout to the surface when constructing the soil vapor points. • Analyze the soil gas samples for total petroleum hydrocarbons quantified as diesel (TPH-D) using analytical method TO- 17 in place of the National Institute for Occupational Safety and Health (NIOSH) method 1550 since method TO- 17 provides compound definitive identification of TPH-D and the NIOSH method 1550 does not provide compound specific data. Please note that the EHD has contacted NIOSH for more information regarding method 1550; the NIOSH representative recommended against using method 1550 for diesel. By a-mail to Taber Consultants on May 26, 2009, the EHD rescinded the directive by letter dated April 28 , 2009, to include the analysis for motor oil when collecting a soil gas sample near monitoring well MW-2. This decision was made after learning that no soil gas method currently exists for motor oil analysis.