SITE INFORMATION AND CORRESPONDENCE_FILE 1

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�- F1I1P COPY ENVIRONMENTAL HEALTn DEPARTMENT SAN JOAQUIN COUNTY Unit Supervisors y Donna K Heron, R.E.H.S. DiCarl Bergman, R.E.H.S.304 East Weber Avenue, Third Floor � Director Mike Huggins, R.E.H.S., R.D.I. A] Olsen,ram R.E.H Stockton, California 95202-2708 Douglas W. Wilson, R.E.H.s. Cq t' FORa(P • Program Manager Telephone: (209) 468-3420 Margaret Lagorio, R.E.H.S. Laurie A.og Cotulla, Man R.E.H.S. Program Manager Fax: (209) 464-0138 Robert McClellan, R.E.H.S. Mark nacelles, R.E.H.S. AUG 0 6 2002 FLOYD BARNES 9744 FOUNTAIN VALLEY STOCKTON CA 95209 RE: Barnes Trucking SITE CODE: 2506 1817 Fresno Avenue Stockton CA 95206 San Joaquin County Environmental Health Department (SJC/EHD) has reviewed the 'Well Installation and Feasibility Testing Reporr' dated May 9 , 2002 that was submitted on your behalf by Clearwater Group and has the following comments. The report documents the installation of one dual phase extraction well and one air sparge well on February 22, 2002, and the performance of groundwater extraction (GWE), soil vapor extraction (SVE) and air sparge (AS) pilot tests on March 12-14, 2002. The conclusions drawn by Clearwater from these tests are that the subsurface at this site is of relatively low to moderate permeability, and that a combination of SVE and AS, with use of GWE to control available vadose zone, would possibly be an acceptable remedial alternative to address the remaining soil and groundwater contamination . The report recommends the preparation of a Corrective Action Plan, which will utilize the information obtained from the feasibility testing to determine the most cost effective and technically efficient method for remediation of the site. SJC/EHD's review of the data suggests that the air sparge response in MW-1 may be due to a sand unit at approximately 25 feet below surface grade (bsg); the lack of response in MW-5 may be due to the shallow depth of MW-6 not encountering the sand unit; and the lack of response in MW-7 is probably due to sheer distance, approximately 120 feet. Encountering the sand at approximately 20.75 feet bsg in the continuous core of MW-2 suggests a southeastern dip to the sand . If the sparged air travels along the sand/fine grained material interface, there may be some difficulty recovering the stripped hydrocarbons. Further testing and modeling of the data may be prudent to be sure that hydrocarbon recovery from sparging is likely. Please proceed with preparation of a Corrective Action Plan and submit it to SJC/EHD by September 30, 2002 . If you have any questions please call Lori Duncan at (209) 468-0337 or Nuel Henderson at (209) 468-3436. Donna Heran , REHS, Director Environmental Health Department Lori Duncan, Senior REHS Nuel C. Henderson , Jr. , R.G . LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV cc: Marty Hartzell, CVRWQCB Adam Newman, Clearwater Group