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ti 41,
<br /> San Joaquin County
<br /> Environmental QG Health Department DIRECTOR Donna Heran,REHS
<br /> 1868 East Hazelton Avenue
<br /> Stockton, California 95205-6232 PROGRAM COORDINATORS
<br /> _ Robert McClellon,REHS
<br /> ' Jeff Carruesco,REHS, RDI
<br /> C'q�iFC1R�`P Website: www.sjgov.org/ehd Kasey Foley,REHS
<br /> Phone: (209) 468-3420 Linda Turkatte, REHS
<br /> Rodney Estrada, REHS
<br /> Fax: (209) 464-0138 Adrienne Ellsaesser,REHS
<br /> October 3, 2013
<br /> EXXONMOBIL EDNA FILIPPI FAMILY TRUST
<br /> ENVIRONMENTAL SERVICES LIMITED PARTNERSHIP ETAL
<br /> c/o JENNIFER SEDLACHEK c/o BANK OF STOCKTON, ROBERT FAY
<br /> 4096 PIEDMONT AVE. # 194 P.O. BOX 1110
<br /> OAKLAND, CA 94611 STOCKTON, CA 95201
<br /> Subject: FORMER EXXON SERVICE STATION #7-3943 LOP SITE CODE: 2231
<br /> 4444 PERSHING AVE.
<br /> STOCKTON, CA 95207
<br /> WORK PLAN: Work Plan (WP) for In Situ Chemical Oxidation
<br /> DATED: September 9, 2013
<br /> PREPARED BY: Cardno ERI
<br /> APPROVED— X
<br /> DTSAPT9 OVED:
<br /> ADUENDUM NEEDED: E Submit by:
<br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN [H&S 25296.10 (c)(3)]:
<br /> 1. A clean water injection test will be performed on existing wells: UVB-MW1,UVB-MW2,
<br /> V1, V2, V4, SW1, SW2, IP1A, IP1B, IP2A, IP213, IP3A, IP313, PSV1, and PSV2. The test
<br /> is to evaluate current well condition and performance prior to oxidant (PersulfOx(D)
<br /> injection.
<br /> 2. If the evaluation of test wells UVB-MW1,UVB-MW2, V1, V2, V4, SW1, SW2, IP1A,
<br /> IP1B, IP2A, IP213, IP3A, IP313, PSV1, and PSV2 is favorable, these wells will be used
<br /> for the PersulfOx®injections.
<br /> 3. Two PersulfOx®injection events into groundwater will be performed approximately three
<br /> weeks apart .
<br /> 4. A contaminant mass calculation in soil and groundwater in the treatment area is
<br /> estimated to be 3,782 pounds and Regenesis (supplier of PersulfOx®) recommends
<br /> 15,500 pounds of PersulfOx®will be needed for treatment.
<br /> 5. The injection rate and pressure will be selected based upon the initial results of the
<br /> clean water well injection test.
<br /> 6. Groundwater monitoring and sampling will be conducted before, during, and after
<br /> injections adhering to Appendix D in the WP.
<br /> 7. Safeguards will be in place to address any spillage or overflow/breakthrough that occur
<br /> on-site or off-site.
<br /> 8. A minimal amount of clean water for flushing will be injected into the treated wells
<br /> following the Persulfox®injections.
<br /> 9. After completion of the field activities and one quarter of groundwater
<br /> monitoring/sampling, a report of findings will be prepared and submitted for review and
<br /> comment.
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