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BEM BEMSystem wj, syslems INC BE 1359 Holz Rubber Co.,Inc. FINAL DRAFT Groundwater Sampling and Analysis Plan Addendum to Soil Sampling Work Plan R.M. Holz Rubber Co.,Inc. 1129 South Sacramento Street Lodi, California 95240 INTRODUCTION BEM Systems, Inc., (BEM) in association with Malcolm-Pirnie, Inc., both full-service environmental and engineering consulting firms, plan to perform a groundwater sampling program at the site of R.M. Holz Rubber Co., Inc., 1129 South Sacramento Street, Lodi, California(see Figure 1, Site Location Map). The purpose of this study is to evaluate whether groundwater quality has been impacted from the historical industrial operations at the subject property. This work is being performed for a confidential client as part of property acquisition environmental due diligence. GROUNDWATER SAMPLING Five (5)groundwater samples will be collected from the perimeter of the site as depicted in Figure 2, Proposed Sampling Locations. The number and locations of the proposed sampling points are based upon current and past activities and known site conditions. The actual locations of the sample points may vary slightly based on field conditions encountered during the implementation of the sampling program. Groundwater sampling will be performed under the direction of a California Registered Professional Engineer or Geologist. SAMPLING PROCEDURE Groundwater samples will be collected using temporary wells. Well installation will be performed by augering to approximately 10 feet below the water table and lowering a 2-inch inside diameter PVC well with a I0-foot screen section at the base. To limit the inflow of formation material (silt), a fine weave polypropylene sock will be fastened to the screened section of the well. Water samples will be collected using a weighted, disposable polyethylene bailer, as soon as the required sample volume has entered the well. Nowell development or well purging will be performed During the advancement of the auger and the collection of the groundwater samples,a photoionization detector(PID)will be used to screen the soil and water for the presence of volatile compounds. SAMPLE HANDLING The samples will be labeled with unique identification numbers, time aad date of sample collection, and the name of the sample collector. Labeled samples will be placed in sealable plastic bags on ice in coolers, cooled to a temperature of approximately 4°C and preserved as appropriate. Samples will be transported in sealed coolers under strict chain-of-custody via overnight air freight for subsequent laboratory analysis. SAMPLE ANALYSIS AND ANALYTICAL METHODS In order to ultimately facilitate rapid transfer of the property, all groundwater samples will be analyzed on an expedited basis, by a California Certified environmental laboratory, for the frill "TCL/TAL+30" analytical suite: target compound list (TCL) organics and 30 most prominent tentatively identified compounds (TICS) and target analyte list (TAL) metals. In addition, all groundwater samples will be analyzed for total petroleum hydrocarbons (TPHC)and pH. The groundwater analytical program is summarized in the following table: September 1996 1 gaac&c-h&cV 3591carresp120/73cd.dac