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*owl V' <br /> PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY , <br /> JOG[KHANNA M.D.-M.P.H. <br /> Health Officer <br /> P.O.Box 2009 • (1601 East Hazclton Avcnuc) •Stockton, California 95201 <br /> (209) 468-3400 <br /> JOHN AND MARGARET MARCI <br /> MARCIS DIESEL SERVICE <br /> 2973 LOOMIS ROAD AUG 2 4 1992 <br /> STOCKTON CA 95205 <br /> RE: . , 2969 Loomis Road SITE CODE: 2015 <br /> Stockton, Ca <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has reviewed the report "Groundwater <br /> Investigation" dated May 1992, submitted by William J. Hunter and <br /> Associates, and has the following comments. <br /> The three soil borings/monitoring wells drilled during the first <br /> phase of the investigation did not adequately define the soil <br /> contamination plume. Figure #5 in the report presents a cross <br /> section of the estimated extent of the soil contamination. <br /> Although there are situations where the extent of contaminant <br /> plumes may be inferred based on available data, additional data <br /> for this site needs to be gathered before the contaminant plume <br /> is fully defined. <br /> In addition, a monitoring well needs to be installed in the <br /> verified downgradient direction. This well is essential in <br /> verifying the quality of the groundwater beneath the site and <br /> also to provide a vital data point for an effective groundwater <br /> monitoring program. <br /> Pursuant to Section 2652 (d) of the Underground Storage Tank <br /> Regulations (California Code of Regulations, Title 23 , Chapter <br /> 16) quarterly .status reports are to be submitted to this office <br /> and the Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) until the investigation is complete. Please begin <br /> submitting quarterly reports effective immediately. <br /> The recommendation in the report to sample only monitoring well <br /> #1 appears to be warranted at this time. All three wells should <br /> be monitored for depth to water and groundwater gradient and/or <br /> inferred flow ditection(s) on a quarterly basis. Monitoring well <br /> #1 should be sampled on a quarterly basis. Based on the <br /> monitoring and sampling results from monitoring well #1 and the <br /> downgradient monitoring well, a groundwater monitoring program <br /> can be established utilizing the monitoring well(s) that will <br /> provide the most useful and needed data. <br /> RECEIVED AUG 2 5 1992 <br /> A Division of San Joaquin Counry Health(are 5crnccs � <br />