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San Joaquin County Environmental Health Department DIRECTOR Linda Turkatte,REHS 1868 East Hazelton Avenue c: \ •��' '� PROGRAM COORDINATORS Stockton, California 95205-6232 Robert McClellon, REHS Jeff Carruesco, REHS,RDI Kasey Foley, REHS �'q l F O R Website: www.sjgov.org/ehd Rodney Estrada,REHS Phone: (209)468-3420 Adrienne Ellsaesser,REHS Fax: (209)464-0138 January 21, 2015 Paula Levand Levand-Bright Family Trust 24692 Sand Wedge Lane Valencia, CA, 91355 Subject: Preliminary Site Assessment Work Plan Site Code: 9403 Levand-Bright Property 3 East Eleventh Street Tracy, California The San Joaquin County Environmental Health Department (EHD) has reviewed Preliminary Site Assessment Work Plan (Work Plan), dated 02 January 2015, prepared by Advanced GeoEnvironmental (AGE). The Work Plan was submitted in response to EHD letter dated 13 November 2014, directing the assessment of the lateral and vertical extent of contamination that resulted from the unauthorized release from a former underground storage tank (UST) system. In the Work Plan, AGE proposes to: • Advance a total of eight soil borings using direct push drilling technology up to 50 feet below surface grade (bsg); • Collect soil and groundwater samples during advancement of the borings; • Analyze samples utilizing a certified laboratory. The EHD approves the scope of work proposed in the Work Plan with the following conditions: • As depth to water in the subject site's area is approximately 10 feet bsg, limit the total depths of lateral borings to the proposed 20 feet bsg and tank pit boring to the proposed 40 feet bsg; • As the UST possibly contained waste fuel, add EPA 8270 (semivolatile organic compounds) to the analytical regimen for a shallow tank pit soil sample; • Neat cement (grout) shall be mixed at a ratio of one 94-pound sack of portland cement with 5 to 6 gallons of'clean' potable water; • Boreholes deeper than 30 feet bsg and/or containing groundwater shall be filled with grout, pumped from the bottom of the borehole up to at least 3 feet bsg through a tremie pipe that extends to within 5 feet of the borehole's total depth; • The EHD requires that work begin no sooner than 5 working days after the EHD permits have been issued; and • The EHD requires inspections to be scheduled with Johnny Yoakum, REHS at least 5 workdays prior to implementing fieldwork; Mr. Yoakum may be contacted via email at JYoakum(DDsicehd.com or (209) 468-3147.