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AV.N{GER$ ESIGNENSOpN$ILTANI$ a 2.0 FIELD SAMPLING SUMMARY Groundwater samples were collected from 8 monitor wells (Figure 1-1) on 3 and 4 December 1995 The workplan specified that 7 monitor wells be sampled the second quarter, however, the EHD requested that all 8 monitor wells be sampled Groundwater sampling data sheets are presented in Appendix A Prior to sampling the water level and total depth of each well was measured The standing water volume within each well was calculated using the water level and total depth measurements A submersible pump was used to remove three well casing volumes from each monitor well At the beginning and during the purge process, the temperature, pH and electrical conductivity of the purge water was measured This information was recorded on a sampling data sheet After purging the well a groundwater sample was collected with a Teflon bailer and disposable nylon string The groundwater sample was transferred into 40 ml glass sample containers ISample containers were checked for air bubbles The sample containers were sealed in a plastic bag, placed with ice in an insulated chest, and logged on a chain-of-custody form for delivery to the analytical laboratory The pump used to purge and sample the wells was thoroughly cleaned prior to each use by placing it into a container of tap water, washing the outside, and pumping water and Alconox through the pump and attached hose Tap water was then pumped through the pump and hose Purge water from all monitor wells except MW-2A was stored in a holding tank located at 222 ' E Weber Avenue Purge water stored in the holding tank will be sampled and discharger) to the sanitary sewer at a later date under a permit from the City of Stockton Department of Municipal Utilities Purge water from MW-2A was stored in a 55 gallon drum located at 100 N Hunter Street MW-2A purge water will be disposed of at a licensed treatment facility All groundwater samples were analyzed by EPA Method 8020 for benzene, toluene, ethylbenzene, and xylenes (BTEX) and by EPA Method 8015M for total petroleum hydrocarbons as gasoline (TPH-G) The analyses were performed by American Environmental Network in Pleasant Hill, California • L T-Mn*.e SJCWCHSA 2ND 11 Juntur 199r7