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CO L01 , 00 1 <br /> 1 <br /> �c HEALTH SERVICES 400. 51 <br />' SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION s <br /> / Karen Furst, M D , M PH , Health Officer cc AV= <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 ILrFoa <br /> 2091468-3420 C (OP <br /> W H COLBERG <br /> ' COLBERG INC DEC 3 19'98 <br /> PO BOX 1288 <br /> STOCKTON CA 95201 <br /> RE Colberg Boat Works Inc Site Code 2005 <br /> 848 W Fremont St <br /> ' Stockton CA 95203 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> ' (PHS/EHD) has reviewed "Fourth Quarter 1998 Groundwater Monitoring Report <br /> Colberg Boat Works" dated November 12, 1998 and "Workplan for Pilot Test and <br /> Feasibility Analysis" dated September 28, 1998 prepared by Apex Envirotech, <br /> ' Inc (Apex) <br /> The analytical results of the groundwater sample from Monitoring Well 3 (MW) in <br /> � .� the former underground storage tank (UST) area were 2,200 parts per billion <br /> (ppb) Total Petroleum Hydrocarbons as Gasoline (TPH-g), 370 ppb Benzene, <br /> 270 ppb Toluene, 120 ppb ethyl-benzene, 300 ppb xylenes, and 30 ppb methyl <br /> ' tert-butyl ether (MTBE) TPH-g, BTEX, and MTBE were not detected in <br /> groundwater samples of MW1 and MW2 MW4, MW5, and MW6 were not <br /> monitored <br /> ' p <br /> Apex proposed oposed en the above-referenced work plan a pilot test to determine the <br /> ' feasibility of oxygen release compound (ORC) as a remediation alternative at the <br /> site by installing ORC "sock" in MW3 Two to three quarters of monitoring well <br /> sampling will determine the effectiveness of the ORC <br /> ' PHSIEHD requests the following addendum to the work plan <br /> ' 1) Baseline parameters should be established for MW1 and MW3 by measuring/ <br /> analyzing the groundwater from each well for dissolved oxygen (DO) level, <br /> heterotrophk plate count, phosphate, ammonia nitrogen, chemical oxygen <br /> ' demand (COD), and biological oxygen demand (BOD) prior to ORC injection <br /> Microbial population and rate limiting components for biodegradation activity <br /> must first be determined to evaluate the feasibility of ORC remediation Also <br /> ' DO levels should be measured at each quarterly monitoring well sampling <br /> event <br /> ' A Division of San Joaquin Counry Heahh Care Se-viccs <br />