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N ' <br /> - San Joaquin County <br /> U. N. Environmental Health Department DIRECTOR <br /> Donna Heran, REHS <br /> r a,x =•i 600 East Main Street <br /> Q'S '' "� PROGRAM COORDINATORS <br /> < Stockton , California 95202-3029 <br /> - Margaret Lagorlo, REHS <br /> r - Robert McClellon, REHS <br /> � �`P, • website: www.sigovorg/ehd <br /> p R Jeff Carruesco, REHS, RDI <br /> li F Kasey Foley, REHS <br /> Phone: (209) 468-3420 <br /> Fax: (209) 4644138 <br /> December 17 , 2009 <br /> Floyd Barnes <br /> 9477 Fountain Valley <br /> Stockton, CA 95209 <br /> Subject: Barnes Trucking <br /> 1817 Fresno Avenue <br /> Stockton, CA 95206 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Third Quarter <br /> 2009 Rebound Evaluation and Groundwater Monitoring Report (Report) dated <br /> November 23, 2009, submitted on your behalf by Clearwater Group (Clearwater) and has the <br /> following comments. <br /> The Report discusses the groundwater sampling results from a routine event conducted at this <br /> site in October 2009 following a six-month hiatus of the oxygen injection remediation system . <br /> Analytical results reported increases in the dissolved contamination in several of the site's <br /> monitoring wells. Clearwater recommends preparation of an updated Corrective Action Plan <br /> (CAP) to address high concentrations of contaminants in the vicinity of wells AS-1 and DPW-1 , <br /> The EHD agrees with this recommendation . Please proceed with submittal of an updated CAP. <br /> The CAP is due for submittal no later than February 26 , 2010. <br /> In the updated CAP please clarify, or redo, the calculations used to determine the mass of <br /> ads�rbe�rurination—pridrtoor ediatio»>�he calculations sob-mittedwith the <br /> November 20, 2002 CAP first state the thickness of the soil profile used is 10 feet, then state the <br /> depth interval of samples used to determine the average concentration is from 19-25 feet bsg , <br /> which is 6 feet, then lists samples used from 11 feet bsg to 26 feet bsg , which is 15 feet, and did <br /> not include results from tank pit samples collected at 16 feet bsg. <br /> Clearwater also proposes, at the next groundwater sampling event, to collect two groundwater <br /> samples from different depths in well DPE-1 , both using low flow purge technique. The EHD <br /> approves this proposal. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Sincerely, <br /> (07A <br /> Lori Duncan , REHS Nuel C. Henderson, Jr. , PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: James Barton, CVRWQCB, 11020 Sun Center Drive #200, Rancho Cordova , CA 95670 <br /> Aaron Wilder, Clearwater Group, 229 Tewksbury Avenue, Point Richmond , CA 94801 <br />