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Chloride was detected in approximately one-third of soil samples <br /> collected. Nitrate and sulfate were detected in almost every soil sample <br /> collected during field activities and ammonia was detected in four <br /> borings. <br /> Arsenic and lead were the only metals detected in soil above their <br /> respective PBGs. However,arsenic detections in soil at the Site are <br /> considered to be naturally occurring. The single detection of lead <br /> exceeding the residential PRG level is could potentially be related to <br /> railroad activity (e.g.,ballast), as all other detections of lead were well <br /> below the PRG. <br /> Groundwater <br /> Total metal concentrations for arsenic,chromium,lead, and nickel were <br /> present at concentrations above the PMCL or SMCL. Nickel was the only <br /> metal detected at a dissolved concentration above its PMCL. <br /> Chlorinated herbicides were detected in four of eight groundwater <br /> samples,but below regulatory limits (PMCL or Region IX Tap Water <br /> PRG). Organochlorine pesticides and organophosphorous pesticides were <br /> not detected in groundwater. <br /> TPH in the gasoline range was not detected in groundwater. TPH in the <br /> diesel range was detected at concentrations ranging from 53 to 920 <br /> micrograms per liter(pg/L),with an average concentration of <br /> approximately 221 pg/L. <br /> Chloride, nitrate, and sulfate were detected in all groundwater samples <br /> collected as part of the Facility Investigation. Chloride was detected <br /> above its MCL in three samples,nitrate was detected above its MCL in ten <br /> samples, and sulfate was detected above its MCL in nine samples. <br /> Ammonia was detected in all but one groundwater sample, and above its <br /> Taste and Odor Threshold in 10 samples. <br /> Due to elevated detections of several specific compounds in groundwater <br /> during Facility Investigation activities,the RWQCB requested that <br /> additional analytical data be collected at the Site from permanent <br /> monitoring wells rather than during boring advancement. <br /> ERM 6 LF CO,INC/0067373.1-N..m 2W7 <br />