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k'% KLEINFELDER An employee owned company File No. C20 AI October 11, 2002 Mr. Lynn Forcum California Natural Products P.O. 1219 Lathrop, California 95330 Via Facsimile (209) 858-4076 and U.S. Mail RE: ADDENDUM NO. 2, GROUNDWATER MONITORING WORKPLAN CALIFORNIA NATURAL PRODUCTS LATHROP, CALIFORNIA (WDR NO. R5-2002-0071) Dear Mr. Forcum, This second addendum to the original workplan prepared for the installation of additional monitoring wells (Kleinfelder document 20-4587-01.WP2/2002R489 dated June 6, 2002) is in response to the comments from the State of California Regional Water Quality Control Board (RWQCB) dated October 2, 2002 and their requirement to address those comments and resubmit the revised Plate 5 of the addendum by October 11, 2002. In the RWQCBs letter of October 2, 2002 it was stated that Kleinfelder did not employ additional groundwater elevation data provided by the Board, nor did it clarify groundwater hydrogeology in the site vicinity. Kleinfelder took the RWQCBs data into account in a lengthy response as stated in the first item addressed in the addendum letter. Kleinfelder's response to the RWQCB original request to "submit groundwater contour maps that better define groundwater flow conditions at the site" in our Addendum No. I was as follows: Kleinfelder was aware of the Sharpe Army Depot data presented by the Board and has taken into account that data in its initial evaluation of groundwater flow of the northern portion of the site and subsequent flow data recorded. In accordance with the RWQCB request the last four quarters of groundwater data has been contoured . In the plant's northern area of the facility where three piezometers (P-1, P-2, and P-3) are located the groundwater flow direction has been recorded as flowing east/southeast, east, northeast, and even south It has been estimated that the Sharpe Army Depot extraction wells operation has influenced the groundwater flow direction. Other domestic or commercial pumping data is not known in areas east or west of the facility. Directly north and northeast of the CNP site on the north side of Lathrop Road the Sharpe Army Depot is located. Along the southern portion of the Sharpe Army Depot is at least ten(10) groundwater extraction wells (EWAI through EWA10) and at least twenty-four (24) monitoring wells within approximately 2,400 feet of the CNP site. Groundwater level contour maps prepared for the Sharpe Army Depot site show groundwater flowing predominantly to the north or northeast in the area of extraction well EWA5 (located within approximately 1,600 feet from CNP) with the exception of the fourth quarter 2001 data which shows groundwater flow in that area to the west. C204587-OI.MNI /ST021,262 Page 1 of Copyright 2002,Kleinfelder,Inc. October 11,2002 KLEINFELDER 2825 East Myrtle Street, Stockton,CA 95205-4794 (209)948-1345 (209)948-0621 fax