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San Joaquin County Environmental Health Department �• = �' .O DIRECTOR Q: ?, 600 East Main Street Donna Heran, REHS X Stockton, California 95202-3029 PROGRAM COORDINATORS ''. Robert McClellon, REHS Jeff Carruesco,REHS,RDI ��FORc� Website: wwW.sjgov.org/ehd Kasey Foley,REHS Phone: (209)468-3420 Linda Turkatte,REHS Fax: (209)464-0138 November 30, 2010 Michael Griffin John M. Leubberke St. John's Episcopal Church City of Stockton 316 North EI Dorado Street 425 North EI Dorado Street Stockton, CA 95202 Stockton, CA 95202 Subject: Sidewalk east of Cancun Restaurant 135 East Miner Street Stockton, CA 95202 The San Joaquin County Environmental Health Department (EHD) has reviewed Monitoring Well Installation Report— Third Quarter 2090 (Report) dated November 12, 2010, submitted on your behalf by Advanced GeoEnviron mental, Inc. (AGE) and has the following comments. In the Report AGE documents the installation of five groundwater monitoring wells during July and August of 2010, their development on August 14, 2010, and subsequent groundwater sampling on October 8, 2010. Based on the analytical results from soil and grab groundwater samples collected from five soil borings installed in 2008, only one groundwater monitoring well, MW-1A, was built to intercept the shallow water table. The remaining wells MW-1 B, MW-213, MW-3B and MW-413 were constructed with a short, discrete 5-foot screen interval set at total depth of 60 feet below surface grade (bsg). Wells MW-1A and MW-1 B are located in the former tank pit area; the other wells are located in the inferred predominant down-gradient direction to the east. Soil analytical results from both the 2008 investigation and the current investigation indicate that significant petroleum hydrocarbon impact to soil has occurred in and around the former tank pit area (borings B-1, B-2 and B-4) but does not extend to the east side of Hunter Street (boring B-3, MW-38 and MW-413). Boring B-5 provides definition of the impact to soil towards the west of the tank pit; no data has been collected to define the soil south of the tank pit. Groundwater analytical results from both the 2008 investigation and the sampling of the new monitoring wells indicate that significant petroleum hydrocarbon impact to the groundwater has occurred, and that it is not vertically defined at 60 feet bsg, nor laterally defined at depth down-gradient of MW-26 (see Table 2). Sheen was reported on the water collected from shallow well MW-1A when it was purged and sampled. ' In the Report AGE concludes that the vertical and lateral extent of the soil and groundwater contamination is defined, that no additional assessment is required, and they recommend that the monitoring wells be sampled only three more times.