COMPLIANCE INFO 1987-2003 - Laserfiche WebLink

Home Browse Search

Phase H Hazardous Materials Study for the Lodi Rail/Multimodal Station July 24, 1997 to Wilbur Smith Associates Project No. E168 Trenching was completed concurrently with the drilling program. Trench spoils were placed and tamped back into the excavation. tThe borings and trenches were logged and sampled by a registered geologist or a registered civil engineer. Samples, drill cuttings, trench walls, and excavated soil were screened for hydrocarbons ' using a photoionization detector (PID). Positive PID readings, if any, were recorded on the boring and trench logs. ' Soil samples were obtained using a driven California split-spoon sampler lined with 2-inch diameter by 6-inch long steel or brass tubes. Soil samples were collected by advancing the boring to the desired sampling depth, removing the auger plug, and lowering the sampler through the auger. The ' sampler was then driven below the auger tip (a total of 12 inches minimum) using a hydraulic driven 140-pound hammer. The lowermost (lead)tube was removed from the sampling device, capped with teflon tape and plastic end caps, then taped and sealed. The sample was then labeled, logged on a ' chain-of-custody/sample management form, and placed in a iced cooler kept at a temperature of approximately 4°C until delivered to the laboratory for analyses. Sampling devices were washed with an Alconox solution and rinsed in distilled water following each sampling event. Summary of Field Exploration Findings Our drilling, trenching, and sampling program generally encountered no features suggesting potential ' hazardous materials or petroleum hydrocarbon impacts at the subject site. The presence of two underground storage tanks were revealed, one that had been previously abandoned in-place at the northeast corner of East Oak Street and South Sacramento Street and the other, a 500-gallon waste ' oil tank, located on the northeast corner of East Pine Street and North Sacramento Street. These items are discussed in the "Findings" section of this report. Considerable amounts of old structure rubble, pieces of piping, old pipelines (mostly water), and scrap metal were encountered throughout the site. Drill cuttings, soil samples retrieved from the borings, and trench excavations were screened visually and with a PID for contaminants. No contaminants were visually detected except in two old oil/water separators which are discussed further below. The PID had positive recordings at two locations. The first location was in cuttings from Boring B7 at a depth of approximately 13 feet where a reading of ' 1.5 ppm total petroleum hydrocarbons (TPH) was recorded. The second location was near the top of the trench wall in Trench T3 where a reading of 3.5 ppm TPH was recorded. The PID was calibrated to 100 ppm benzene. ' Contaminants and/or soil discoloration were not observed at the locations that positive PID readings were recorded,nor were any odors detected. No contaminants were recorded in soil samples retrieved ' above and below these locations when screened with the PID or sent to the laboratory for analysis (see discussion below). It is suspected that these positive PID readings were erroneous (as is quite common) or may indicate very low quantities of isolated volatile organic compounds. 1 Laboratory Analyses ' Selected soil samples (samples considered to have the highest likelihood of contaminants based on our field findings or observations) were submitted to Excelchem Environmental Laboratories for ' analyses. The results of the laboratory testing are attached in Appendix II of this report. 4 V ESPANA GEOTECHNICAL CONSULTING