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F E py <br /> ENVIRONMEN L HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. <br /> 304 East Weber Avenue Third Floor Car[Borgman,RIA.S. <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • e." er Mana <br /> Program q •.�oR "� g g Telephone. (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209)f464-0138 Mark Barcellos,R.E.H.S. <br /> JOHN CERVANTES FEB 18 2003 <br /> PO BOX 6008 <br /> STOCKTON CA 95206-6008 <br /> RE: JC Trucking SITE CODE: 2571 <br /> 1207 Aurora Street <br /> Stockton CA 95206 <br /> San Joaquin County Environmental Health Department (SJCIEHD) has reviewed the <br /> "Work Plan to Conduct Remediation Efforts-Addendum 1" dated December 18, 2002 that <br /> was prepared by JJW Geosciences, Inc. (JJW) on your behalf and has the following <br /> comments. <br /> The work plan was written in response to SJCIEHD correspondence dated <br /> October 31, 2002, and includes: <br /> 1. A work plan for the installation of ozone sparge points and destruction of damaged <br /> monitoring well MW-3, <br /> 2. An estimate of contaminant mass remaining in the soil and groundwater, <br /> 3. A site conceptual model consisting of one cross section and a discussion of the <br /> data, and <br /> 4. A proposal for remediation of the documented soil contamination. <br /> The cross section provided is rather general; please provide at least 2 lines of section that <br /> display all monitoring well screen sections and pertinent lithological and contaminant <br /> distribution data. The same scales should be utilized for all cross sections. Also, the <br /> boring logs provided to date are rather general and interpretational. SJCIEHD needs the <br /> actual field data to validate the site conceptual model. To save time and money, please <br /> submit copies of the field logs to SJCIEHD. <br /> SJCIEHD specifically requested estimates of the contaminant mass remaining in the soil <br /> in both the vadose and saturated zones, as well as the estimated dissolved mass. These <br /> are routine requests for all contaminated UST sites undergoing investigation and <br /> preparing for remediation. JJW estimates the mass of gasoline remaining in the soil <br /> above the water table to be 600 kilograms (kg). However, they based their estimates on <br /> analytical data from the soil samples collected from borings MW-2 and MW-5 only. No <br /> justification was provided as to why data from the tank pull samples and soil borings B-1 <br /> thru B-8 were not included to develop the estimate. Although analytical data is available <br /> from 45 feet to 75 feet below surface grade (bsg), JJW concluded that there is not enough <br /> data to estimate the mass remaining in the saturated zone below 35 feet bsg. In addition, <br /> no calculations were included. SJCIEHD would like to review the calculations and <br /> assumptions used to determine the mass reported. <br />