Laserfiche WebLink
r <br /> G----- <br /> C LEARWATER <br /> G R O U P, I N C <br /> Enviran.—W Serv,eec <br /> Clearwater installed monitoring well MW-6 on September 19, 1995 This well was <br /> installed approximately 120 feet downgradient of MW-2 in order to assess the <br /> downgradient limits of the hydrocarbon plume. At the time of the installation of <br /> MW-6, Clearwater also supervised the drilling of two vapor extraction wells, two air <br /> sparging wells and one 81-foot deep investigative soil boring This work, as well as <br /> the results of the third quarter 1995 groundwater monitoring, are described in <br /> Clearwater's Report on Site Assessment Activities, Pilot Fest, and Quarterly <br /> Groundwater Monitoring, dated December 15, 1995 <br /> 3.0 FIELD ACTIVITIES <br /> All work was performed in accordance with Clearwater Field Procedures (previously <br /> submitted) and under the directives and guidelines established by the PHS/EHD and <br /> the Regional Water Quality Control Board All monitoring wells were gauged and <br /> sampled on May 30, 1996 <br /> Depth to water was gauged from the survey mark at the top of each well casing <br /> Prior to sampling, all wells were purged of a minimum of three well volumes <br /> Well purging information is presented in Appendix A <br /> Groundwater samples were collected from the monitoring wells using dedicated <br /> polyethylene bailers Well numbers and sampling information were recorded on <br /> sample labels and documented on a chain-of-custody form The samples were then <br /> placed in a chilled cooler for transport to American Environmental Network (AEN), <br /> a state DHS-certified laboratory located in Pleasant Hill, California All groundwater <br /> samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg) by EPA <br /> Method 8015 (5030/GCFID), for benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX), and methyl tertiary butyl-ether (MTBE) by EPA Method 8020 <br /> D-101 2Q96 2 June 21, 1996 <br />