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In <br /> _ : s �-ter �: AW <br /> wh as• ' -vL �, "r-..: i r, °'s aY3 s =x a: <br /> REM i <br /> After the drilling, the observation wells were constIructed <br /> 3-inch diameter, SChedcje 40 PVC casing and 0.020-inch <br /> factor using <br /> Yeslae#ed screen, The screen was placed through the entire <br /> saturated section, extending approximately 10 feet above the static <br /> water level. Graded sand pack was placed in the annular <br /> the screened interval, and it extended approximately 3 feet above the <br /> screen. A bentonite space across <br /> e and concrete seal extends from the sand pack to <br /> the ground <br /> byurface.r_p ancking cap and protective vault box were <br /> borings (S-A Y top of the well. <br /> g and S-8) were backfilled with Concrete Tafter he pcompletion <br /> ' of drilling. <br /> field Chem cal A a 1515 <br /> iAnpthalFicld foreach <br /> valatilsample was used to <br /> Rerfarm a head-space test <br /> Involved measuring organic COi7Pnlinds, The test procedure <br /> psubxsampleyin0 grans from an undisturbed soli <br /> sample, Placing this <br /> glass <br /> the jar with aluminum foil secured under as rrin -t <br /> jar' and covering <br /> t The jar <br /> was placed in a b <br /> warm water gype threaded lid. <br /> approximately twenty Minutes. Then the failt0 degrees F) for <br /> head- ace within the <br /> jar was was <br /> tested for total Organic <br /> and the <br /> measured in parts per million, with an H-NU panic vapor, <br /> detector. The results of these tests a Photo-ianizetian <br /> r <br /> ppear an the boring logs. <br /> 1laIer S m 1 t Proce use <br /> Sanund i, Ca sampling was performed by Blaine Technical Services of <br /> Sen Tns�, California. Their sampling g Procedures are summarized <br /> Before Sampling, the water Ievel <br /> was clean twell <br /> ape measure. :text, the observation rwell ed nwasecheckausing <br /> a <br /> presence of floating petroleum product, using r the <br /> bailer. No floating g a clean, clear acrylic <br /> 3"Pled b 9 Following <br /> tet was detected, sa the weI! was Purged and <br /> Y the foilouing technique; <br /> The well was purged of a minimum of four Cas <br /> Ceotech bladder pump constructed of stainless nsteel uand Teflmes on. <br /> If If the well discharge Was extreme] turbid <br /> s Y additional <br /> was performed to aid in well development. After the was <br /> water sam P les were collected from the purging, <br /> into appropriate EPA-a PuriP discharge and placed <br /> ` f ainers. 191 <br /> drummed In clean DepartmenteofContTransportation1aPurge water was <br /> Pproved <br /> ff containers. The ground-water samples were labeled, logged <br /> } <br /> chain-of-custody documents, and <br /> 3 Y gged onto <br /> Placed on ice For transport. <br /> A!1 Sampling equipment was cleaned before sampling. <br /> g._the-wcll�-'by-.. ------ - - <br /> - flushing f.ar a minimum of fifteen <br /> — minutes. This process equates to a minimum of 40 pump volumes. ---- — <br /> i <br /> ;' 100-13.01 <br />