ARCHIVED REPORTS_XR0010764 - Laserfiche WebLink

Home Browse Search

Mr Harlan Knoll, RE H S September 17, 2004 Page 2 The monitoring wells were purged with a 12-volt battery operated submersible pump and sampled with a discharge rate of less than 1 L/mmute Field measured water quality parameters were measured using a Cambridge Scientific Industries Hydacrm Conductivity Temperature pH Tester The appropriate information was logged onto the field sampling forms Well purging activities and the field measured water quality parameters are documented on the forms included in Attachment A. Groundwater samples from each well were collected into four 40-mL glass vials with TeflonTm septum lids Following sample collection, each sample bottle was labeled with the sample designation, date and time, and the initials of the sampler The sample bottles were then placed into an ice chest maintained at the temperature available from its also containing a bed of crushed ice, and its melt water, placed there at the start of the sampling day The ice was not allowed to completely melt before it was replaced The sample number, date, and time was entered onto a chain-of-custody form that included the request for analysis of Total Petroleum Hydrocarbons in the gasoline range(TPH-g), the volatile aromatic hydrocarbon compounds(benzene, toluene, ethylbenzene, and total xylene isomers), the fuel oxygenates tertiary-Butyl alcohol(TBA),Methyl tertiary-butyl ether(MtBE),Di- isopropyl.Ether (DIPE), Ethyl tertiary-butyl ether(EtBE), and ternary-Amyl methyl ether (TAME) by U S E P A Method 8260B The samples and chane-of-custody documentation were then delivered to STL San Francesco (CA DHS ELAP#2496) of Pleasanton, California on August 25, 2004 3 0 GROUNDWATER ANALYTICAL RESULTS Copies of the laboratory analytical reports prepared by STL San Francisco and the chain-of- custody documentation are contained in Attachment B All available previous analytical data are also summarized in Attachment C The analytical results for samples collected in 2004 are listed in Table 3 Groundwater from MW-3 was reported with 500 pg/L TPH-gasolene Benzene was reported at a concentration of 3 1 pg/L The other aromatic hydrocarbons (toluene, ethylbenzene, and total xylene isomers)were reported at low levels from 2 1 to 8 1 gg/L (see Table 3) The method 8260B fuel oxygenates were reported as"N D" at their respective reporting limits Groundwater from MW4 was reported with 2,000 pg/L TPH-gasolene Benzene was reported at a concentration of 16 pg/L The other aromatic hydrocarbons were reported as follows toluene 3 6 pg/L, ethylbenzene 17 pg/L, and total xylene isomers 81 pg/L All method 8260B fuel oxygenates were reported as"N D" at their respective reporting limits i H2OGEOL A GROUNDWATER CONSULTANCY I