ARCHIVED REPORTS_XR0011735 - Laserfiche WebLink

Home Browse Search

Appendix D Direct Push Boring InvestIgatuon Phase I1 ESA Multi-Modal Station"Six-Block Project' January 6,2003 Page 3 of 15 . If soil contamination was observed in field samples below 15 feet bgs, additional soil samples were collected at approximately five-foot intervals through the extent of impacted soil and retained for analysis The soil sampling equipment was cleaned prior to collecting each sample by washing it in a solution of laboratory-grade, non-phosphate detergent and deionized water, and double-rinsing with delonized water Upon completion of the daily fieldwork, the soil samples were delivered by courier, under chain-of- custody procedures, to Excelchem Environmental Labs, Inc , in Roseville, California (Excelchem) The three soil samples collected from each boring at 5, 10, and 15 feet bgs were typically composited in a three-to-one ratio by the laboratory and analyzed for volatile organic compounds (VOCs)by EPA Method 8260B If soil contamination was identified by field observation or PID screening, the three soil samples collected between five and 15 feet bgs, as well as any additional soil samples collected from depths greater than 15 feet bgs, were analyzed discretely for VOCs by EPA Method 8260B Analyses including those for semi-volatile organic compounds (SVOCs) by EPA Method 8270C, petroleum hydrocarbon constituents by EPA Method 8015m, and the 17 California Administrative Manual (CAM) metals by EPA Methods 6010B and 7471A were held pending the results of the VOC analysis 3.2 GROUNDWATER SAMPLING PROCEDURES AND LABORATORY ANALYSES Groundwater samples were collected from the detection and hydropunch borings An attempt to obtain representative depth to water data, and minimize sample turbidity, a temporary well screen was installed in the detection borings, and these borings were allowed to stand open until the end of the day in which they were installed The depth to water measurements and groundwater samples were collected from the bonngs in the same order that they were installed Prior to sample collection, the water level in each • detection boring was measured to the nearest 0 01 foot with a battery-operated water-level meter The depth to water was referenced to the ground surface adjacent to the boring The water-level meter was cleaned prior to measuring the depth to water in each boring by washing it in a solution of laboratory- grade, non-phosphate detergent and deionized water, and double-nnsing with deionized water The detection and hydropunch bonngs were sampled using polyethylene tubing fitted with a stainless steel check valve The sample containers were slowly filled directly from the sample tubing in order to minimize sample agitation Each water sample was collected in a minimum of three 40-milliliter (mL) volatile organic analysis (VOA) vials, two one-liter amber glass containers, and one 250-mL plastic container Each sample container was labeled for sample Identification and placed in a cooler chilled with ice Fallowing the collection of the groundwater samples, the detection and hydropunch bonngs were backfilled with neat cement grout at the end of each day Upon completion of the daily fieldwork, the groundwater samples were delivered by courier, under cham- of-custody procedures, to Excelchem The groundwater samples collected from the bonngs were analyzed for VOCs by EPA Method 8260E Additional analyses including those for SVOCs by EPA Method 8270C and petroleum hydrocarbon constituents by EPA Method 8015m were held pending the results of the VOC analysis •