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San Joaquin County DIRECTOR <br /> Po�,N Donna Heran,REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> Stockton, California 95202-3029 <br /> d * PROGRAM COORDINATORS <br /> -- Carl Borgman,REHS <br /> c-9 ... .. P. Website: www.s ov.or /ehd Mike Huggins, REHS,RDI <br /> i F o R 19 9 Margaret Lagorio, REHS <br /> Phone: (209) 468-3420 Robert McClellon, REHS <br /> SIERRA LUMBER Fax: (209) 464-0138 Jeff Carruesco,REHS,RDI <br /> P O BOX 6216 Kasey Foley,REHS <br /> STOCKTON CA 95207 <br /> RE: 375 Hazelton Ave Site Code: 1644 <br /> Stockton Ca <br /> WORK PLAN: Work Plan Addendum for CPT Investigation -April 2008 Case#2 <br /> DATED: April 14, 2008 <br /> PREPARED BY: AGE <br /> APPROVED: [X] <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN [H&S 25299.37 (c)(3)1: <br /> 1. To advance 5 on-site CPTs to a total depth of 100 feet bsg and complete continuous recorded <br /> lithologic tests for evaluation of the stratigraphic and hydrogeologic unit. <br /> 2. To collect independent soil and ground water grab samples from targeted zones, based upon <br /> interpreted lithologic data. The borings used for sampling will be within 2 feet of the 5 CPT log <br /> locations. <br /> 3. The soil and ground water samples will be analyzed for THP-gas, BTEX, fuel additives (i.e.1,2 <br /> DCA)and fuel oxygenates by a CDPH certified laboratory in accordance with EPA Method <br /> 8015M and EPA Method 8260B. <br /> 4. A report of findings will be completed and submitted to EHD and CVRWQCB. <br /> COMMENTS AND CONDITIONS <br /> 1. Soil samples with elevated field PID measurements must be submitted for chemical analysis. <br /> 2. AGE must procure the required EHD permits by July 31, 2008 and begin the proposed scope <br /> of work by September 15, 2008. <br /> 3. The report of findings must be submitted to EHD and CVRWQCB for evaluation within 90 <br /> days of completion of the CPT investigation and must include comments, conclusions and <br /> recommendations. <br /> 4. Because of the high concentrations gasoline contaminants in MW9 and MW 15, interim <br /> corrective action should be evaluated to reduce mass in the source area near the former UST <br /> location. Existing MW9 and MW 15 could perhaps be use for batch groundwater extraction. <br /> _DATED BY 744A-1'L <br /> Harlin Knoll, Senior REHS (209)468-3442 <br />