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<br /> I"R GROUND WATER AND FR FF FLOATING 1'R0pliC7-I)I?pTII I}ITI;Rhi1NATI[)N
<br /> A v.-ater/petroleum product interface probe u ;nod to determine[he fret.piNuct thirkncxs,ifpresen[,and
<br /> a water level indicator was used to measure the ground water depth in monitoring wells that do no[contain
<br /> free product. Depth to ground water was measured from the top of the monitoring well rasing,which has
<br /> been surveyed to within O.OI-foot relative to the City of Lodi bench mark with an elevation 51.70 feet abovr.
<br /> mean sea level,(Figure 2). "the tip of the water level indicator was subjectively analyzed for product sheen,
<br /> All measaremcnts and physical observations
<br /> in Endosarc B. were recorded in the�;:Id on separate data sheets presented
<br />' r 2.0 SUII,[iC1IVF"ANALVSJS OI'GRCIUNII WATIiR
<br /> waPrior to purging a water sample was collected from the monitoring wells for subjective analysis, The sample
<br /> was retrieve d by gen t?y lowering a clean,dis 6
<br /> posy le bailer to approximately one-half the baffle.length past
<br /> the air/liquid interface The bailer was then retrieved, and the satrtplc contained within the bailer was
<br /> examined for floating product and the appearance of a petroleum product sheen.
<br /> I ll 0MIT.ORING VNIsLL I)EVF.I.OPNIFNT pURGIN; AND SAl►IPLING
<br /> Monitoring wells were purged of three to four well vv+umcs of water using
<br /> ump
<br /> Ground water removed from the welly was sr bailer.
<br /> for,;d in 55-gallon barrels at the Site.cThe barrels were 1 beled
<br /> With correslwndiug monitoring well numbers t�:,d the date of purging. After purging,ground water levels
<br /> were allowed to stabilize. A water sample was thy;, removed form each of the wells vsin�a at
<br /> bailer" If the, well was ur cel d b disposable
<br /> P g ry, it was allowed to sufficiently recharge and'a sample bras collected.
<br /> Samples were collected in airtight vials,appropriately labeled,and stored on ice from the time of collection
<br /> through the time of delivery to the laboratory. A chain-of-ccstody form was completed to ensure mple
<br /> sl
<br /> integrity. Ground water samples were transported to the labor:alory and analyzrd within the EPA-specified
<br /> ci[icd
<br /> holding times for the rc gncsted analyses. Purge water will be collcctcc!from the storage narreLs in a vacuum
<br /> truck and transported to an alrproprime facility far treatment and/or disposal.
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