ARCHIVED REPORTS XR0011120 - Laserfiche WebLink

Home Browse Search

Manta Brothers Service Station 5 August 21, 1992 0 N'111 in the well During purging, key parameters including temperature, conductivity, and pH will be measured with a portable electronic meter and recorded The meter will be calibrated prior to the sampling event The purging will continue until the monitored parameters stabilize (usually after three to four casing volumes of groundwater have been removed) The groundwater monitoring wells will be sampled after water in the wells has recharged to approximately 80% of the original ground water elevation If, during purging, the monitoring well is purged dry, purging will be stopped for five minutes to allow the well to recharge if the well does not recharge at a sufficient rate to continue purging the three to four casing volumes, the well will be allowed to recharge and will be sampled Following purging, groundwater samples will be collected with new pre -cleaned disposable TeflonTm bailers, and discharged with a non -aerating bottom emptying device into sterilized glass containers, capped with TeflonTM septa, labeled, and chilled in an ice chest for transport The water samples will be handled and transported according to the United States Environmental Protection Agency (USEPA) protocol to the DHS certified laboratory requested Sample identification and chain of custody procedures will be utilized to ensure sample integrity and to document sample possession from the time of collection to its ultimate disposal The sample labels will identify the job number, sampler, date, time of collection, and sample number unique to the sample. The proposed monitoring wells will be surveyed relative to a permanent structure, and from a designated point on the north side of the top of the well casing, the groundwater level will be measured in the well to an accuracy of 001 feet Purgeable Petroleum Hydrocarbons as Chemical Analysts of Soil and—Gr oundwater Samples Soil samples will be sent to a State of California certified laboratory Based on field observations, two soil samples from each well will be selected for laboratory analysis Soil samples will be analyzed for Total Purgeable Petroleum Hydrocarbons as gasoline (TPPHg), and the gasoline constituent volatile aromatics benzene, toluene, ethylbenzene, and total xylenes (BTEX) by the California DHS LUFT Method, and USEPA Method 8020, respectively The groundwater sample will be analyzed for TPPHg, and • BTEX by the USEPA Method 502 1 EB -8101-3 9208-Eo46 WP