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San Joaquin County DIRECTOR <br /> o� N Environmental Health Department Donna Heran,REHS <br /> op,.......,. c <br /> 1868 East Hazelton Avenue PROGRAM COORDINATORS <br /> REHS <br /> a. < Stockton, California 95205-6232 Robertrruesc ,R <br /> N: ..: Jeff ey Foley, <br /> R RENS,RDI <br /> Kasey Foley,REHS <br /> ' !P_ Website: www.Sjgov.org/ehd Linda y s trailtte.REHS <br /> • c4Ci"FpR�\ ,REHS <br /> Phone: (209)468-3420 Rodney Ellsa sser,R <br /> Fax: (209) 464-0138 Adrienne Ellsaesser,RENS <br /> January 6, 2014 <br /> Diggler and Wad LLC <br /> Mr. Scott Damouny <br /> 2707 E. Fremont St., Suite 14 <br /> Stockton, CA 95205 <br /> Subject: Former ARCO Gas#443 <br /> 2478 E. Oak Street <br /> Stockton, CA 95205 <br /> Dear Diggler and Wad LLC: <br /> ent <br /> DepE <br /> rThSan Joaquin, County Environmntaleviewed Site Assessment Work Plane dated 08tNovember 2013, prepared and sved and <br /> ubmitted <br /> by your consulting firm, Broadbent & Associates, Inc. (B & A), on your behalf for the <br /> above-referenced site. The EHD approves the work plan with conditions as noted below: <br /> In the Site Assessment Work Plan, B & A reported that after reviewing the historical and <br /> samling daa for MW-8, they beeve the rity of <br /> sed <br /> and the a istno evidence of vertical migration ti nth s we. Therefore,8 has tB & A conclude been lthat <br /> decommissioning and replacing MW-8 with another monitoring well would not add any <br /> value to the future sampling and monitoring results of the site. B & A also recommends <br /> that MW-8 be left as a data point and continue to be sampled on a semi-annual basis. <br /> The EHD is of the opinion, that MW-8 provides vertical delineation of impacted <br /> MW-1S, MWAD and <br /> groundwater as, MW-3S show impact that is apparently not cross- <br /> contaminating MW-8. Therefore, the EHD concurs with the recommendation presented by <br /> B &A. <br /> In the Site Assessment Work Plan, B &A proposes to perform a ground penetrating radar <br /> Although survey not to verafy ed y tthat no he EHD, this proposed scope of wok is apprrovedunderground storage tanks are nt at the site. <br /> B & A also proposes to purge and sample the soil gas wells after conducting shut in and <br /> helium leak test. According to the Department of Toxic Substances Control, April 2012 <br /> Active Soil Gas Advisory Investigations, "For soil gas wells installed with hollow stem or <br /> hand auger drilling methods, do not conduct the purge volume test, leak test and soil gas <br /> sampling for at least 48 hours after soil gas probe installation." <br />