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STATE OF CALIFORNIA GEORGE DEUKMEJIAN, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION - <br /> ¢ <br /> 3443 ROUTIER ROAD, SUITE A : <br /> SACRAMENTO, CA 95827-3098 <br /> E <br /> 7 August 1990 <br /> g AUG G 8 1990 <br /> Ms. Diane Hinson ENVIRONMENTAL HEALTH <br /> Supervising REHS PERMIT/SERVICES <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton CA 95201 <br /> UNION ICE COMPANY, 1320 WEST WEBER STREET, STOCKTON - REPORT OF FINDINGS; <br /> PHASE I <br /> We have reviewed the 14 June 1990 Report of Findings for the Phase I <br /> Investigation prepared by WHF Environmental Consultants and Hinkle and <br /> Associates for this site. The investigation included installation of one <br /> deep monitoring well and five shallow monitoring wells. Three rounds of <br /> ground water samples were obtained from the monitoring wells. However, <br /> due to inadequate sampling protocols, the consultants consider the results <br /> from the first two rounds of sampling to be invalid. <br /> According to the report, low levels of xylene and total petroleum <br /> hydrocarbons as gasoline were detected in soil on-site. Although the <br /> analytical results for soil samples appear to confirm this finding, <br /> gasoline saturated soil and free petroleum product were noted on boring <br /> log for MW-4S. Therefore, it is difficult to understand why the <br /> analytical results for this well show only relatively low levels of <br /> petroleum hydrocarbons. This discrepancy may be due to inadequate well <br /> development, inappropriate sampling protocols or damage to the well by <br /> intrusion of grout from the adjacent well , as noted on the boring log. <br /> The consultant has recommended that a soil vapor survey be conducted. <br /> Based on the results of the soil vapor survey, two to three additional <br /> monitoring wells would be installed to define the extent of soil and <br /> ground water contamination. Due to the uncertainty regarding the <br /> reliability of samples from MW-4S, we believe this well should be replaced <br /> during the next phase of investigation. In addition, a detailed sampling <br /> and analysis plan with strict quality control protocols should be <br /> developed for this site, and approved by County staff. <br /> If you have any questions, please call me at (916) 361-5731 . <br /> �— z9. �� � <br /> THOMAS D. PELTIER <br /> Associate Engineering Geologist <br /> TDP/tdp <br />