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STATE OF CALIFORNIA—CALIFORNIA ENVIROA AL PROTECTION AGENCY PETE WILSON,Gove <br /> DEPARTMENT OF TOXIC SUBSTANCES CONTROL HEALTH <br /> 400 P STREET,4TH FLOOR -. <br /> P.O.BOX 806 <br /> SACRAMENTO,CA 95812-0806 <br /> (916) 323-3372 `Y `? �M 10: 20 <br /> May 20, 1996 <br /> Ms . Laura M. Bazeley, R.G. <br /> WZI Incorporated <br /> 4700 Stockdale Highway, Suite 120 <br /> Bakersfield, California 93309 <br /> RE: REVISED SOIL GAS AND SOIL SAMPLING WORKPLAN AT LUSTRE-CAL <br /> SITE <br /> Dear Ms . Bazeley: <br /> The Department of Toxic Substances Control (DTSC) and the <br /> Central Valley Regional Water Quality Control Board have reviewed <br /> your May 1996 workplan for soil gas and soil Sampling at the <br /> Lustre-Cal site . The workplan is conditionally approved based <br /> upon the following changes being incorporated in a letter of <br /> addendum: <br /> 1 . Page 2 . The second paragraph. WZI specifies that the <br /> goals of the soil gas sampling are to: (a) determine source areas <br /> in and around the Lustre-Cal property; (b) identify the vertical <br /> and horizontal extent of volatile organic compounds (VOCs) in the <br /> subsurface at and around the Lustre-Cal facility for the <br /> implementation of the soil vapor extraction remediation system. <br /> Comment: <br /> (1) The soil gas locations proposed on the southwest of the <br /> Lustre-Cal facility needs to be moved to a location adjacent to <br /> the Lustre-Cal building (see Exhibit 1) ; <br /> (2) The soil gas location proposed on the west side of the <br /> Lustre-Cal facility are of low priority. This one could be <br /> eliminated if you so desire (cross out as shown in Exhibit 1) . <br /> (1) Additional shallow soil gas samples in and at the <br /> Lustre-Cal facility are needed to identify the extent of VOCs <br /> contamination in the vadose zone. DTSC requires that shallow <br /> soil gas samples (10 feet below the ground surface) be collected <br /> at additional twenty (20) locations. The 20 locations are <br /> depicted on the attached exhibit 1 by circled dots . <br /> 2 . Page 2 . The first paragraph. WZI states that "DTSC <br /> staff have stated these data suggest there may be either (1) <br /> additional source areas in or around the LNC property or (2) that <br /> the sewer or storm drain system may be transporting VOC-bearing <br /> liquids along or through the LNC property, possibly from offsite <br /> sources . " <br /> h <br /> ti <br /> h.W M Rs Ipsr <br />