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.UH DaW'. "'1L �_ -a' W'Sr -n,µ tNl, ..,,y NSYk.,i�s° } i J` �i, c -.' { d,', r. z. •r, ..0 a- - <br /> 4 <br /> aay <br /> r <br /> r <br /> !linsc�,F"(cy/Id I-c6ruary 195Y WGR <br /> encountered. The wells Will be dcveloped bl methods appropriate to(he saLsurface <br /> rcprescntativc groundwater samples. conditions to provide <br /> MONITORING WELL PURGING AND GROUND WATER SAMPLING PROCEDURE <br /> The WGR procedure for purging and sampling groundwater monitoring wells is included in <br /> Attachment D.-Ihrecwcll borevolumeswill be purged from <br /> PVC bailer. Ticath well and sampled with a steam-cleaned <br /> will <br /> samples and a travel blank will be sent under chain-of-custody to the laboratory. Thepurge walerwibe stared onsite in 55-Gallon drums pending laboratory analysis, <br /> ANALYTIC LABORATORY <br /> Soil and groundwater.samples will be sent to Central <br /> Luis Obispo California,a Coast Analytical Services(CCAS)of San <br /> slate•rertified laboratory. Thcsampleswill be run per EPA Afethodsspccified <br /> in the 2 June 1935, Regional Board Staff Recornmc-!darions For initial Evaluation and <br /> Investigation Of Underground Storage Tanks, <br /> All sort simples selected from borings B-i through R-5,sill by analyzed by EPA Nlethod 524.2 for <br /> total purgeable petrolcurc hydrocarbons(TPPH)and aromatic Jydrocarbons, nrenc, <br /> toluene,ethyl benzene which include be <br /> and total xylenes(BTEX). In addition, sclecced soil samples from boring B-3, <br /> adjacent to the formerlocation of the waste oil tank,will be analyzed for purgeablc priority pollutantsby <br /> EPA Method concerning <br /> and use <br /> f E Method 503 for oil and grease, A discussion by S. Havlicck,Ph.D,of <br /> CCAS,concerning the use of EPA Xlelhod 524 2versus EPA Method 8015 for analyzing soil and water <br /> samples for fuel hydrocarbons is included as Attachment E. <br /> All water samples collected from wells%1W-1 through MW-5 will be analyzed by.EPA Alethod <br /> 534.2 for TPPI3,BTEC,and purgeablc priority pollutants. In addition,the water sample collected from <br /> i( tivc lJ MW-3 will be analyzed by EPA Jlfethod 503 for oil an6 grease. <br /> SUMMARY <br /> The objective of this proposed wort <br /> hydrocarbons that may be present in lire vadplan is to better define the vertical and horizontal extent of <br /> ose zone and in saturated soil in[be subsurface at Chevron <br /> service station#942751n order Io obtain this obj_ctivc,S groundwater monitoring wells will be instahcd, <br /> ydro eolo n based on the results at the SVS,past soil sampling data,ani local and regional geology and <br /> Regional 13oy. During well installation,soil samples will be collected and analysed according to recent <br /> Regional Board Staff Recommendations. following the installation,ali of the monitoring wells will be <br /> surveyed relative lomean sea level to determine top-of-casing elevations. hhesccJcvalionswill be used <br /> to determine ground water elevations and groundwater flow direction.. After the monitoring wells are <br /> developed they will be sampled for analysis according to recent Regionul Board Staff Recommendations, <br /> The laboratory results will be evaluated in conjunction with previously collected data and a technical <br /> report will be preparcd- <br /> 1041.2Fc9 <br />