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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> F' Donna Heran,REHS <br /> 600 East Main Street <br /> a. < Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> REHIS RS <br /> Robertrruesc lon,REHS <br /> Jeff Carruesco,RENS,RDI <br /> Kasey Foley,REHS <br /> • d••., �P • Website: Www.sjgov.org/ehd Linda TurkaHe,REHS <br /> 4ciFORa Phone: (209) 468-3420 <br /> Fax: (209)464-0138 <br /> SIERRA LUMBER MANUFACTURERS <br /> P O BOX 6216 <br /> STOCKTON CA 95207 <br /> RE: Sierra Lumber (Case 2) �© Site Code: 1644 <br /> 375 Hazelton Ave. �✓ <br /> Stockton, Ca 95203 <br /> WORK PLAN: Dual Phase Extraction Feasibility Study <br /> DATED: June 21, 2010 <br /> PREPARED BY: Advanced GeoEnvironmental <br /> APPROVED: (X) <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN (H&S 25296.10 (c)(3)1: <br /> 1. To perform a 72 hour dual phase extraction (DPE)feasibility study to determine if this <br /> technology is viable remedial alternative to remove contaminant mass from the soil and <br /> the ground water in the source area on-site. <br /> 2. To install two 4-inch wells: one extraction well to approximately 40 feet bsg; one <br /> observation well to approximately 40 feet bsg. Both wells will be screened from <br /> approximately 10 to 40 feet bsg. <br /> 3. To collect selected soil samples from the pilot borings, prior to well installation, for <br /> chemical analysis of: THP-g, BTEX, fuel additives (including 1,2-DCA), and fuel <br /> oxygenates (including MTBE). <br /> 4. To develop and survey the new wells. <br /> 5. To stage an above ground storage tank on-site to temporarily contain the extracted <br /> ground water pending proper recycling or disposal. <br /> 6. To prepare and submit a DPE evaluation report with conclusions and recommendations. <br /> COMMENTS AND CONDITIONS: <br /> 1. Other existing on-site MWs that have exposed screen interval to the vadose zone <br /> should be used to measure vacuum influence during the test. <br /> 2. All required permits must be procured from EHD prior to the installation of the wells. <br /> 3. The work must be completed by December 15, 2010 and the report of finding must <br /> prepared and submitted within 60 days after the completion of the DPE pilot test. <br /> DATED 09/30/2010 BY % -" <br /> Harlin Knoll, Senior REHS (209) 468-3442 <br /> Cc: Tim Cuellar, AGE, 837 Shaw Road, Stockton, CA 95215 <br />