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URS March 3, 2005 San Joaquin Public Health Service Environmental Health Division ` ATTN Mr Jeffrey Wong 304 E Weber Avenue, third Floor Stockton, California 95202 RE: THIRD AND FOURTH QUARTER 2004 GROUNDWATER MONITORING REPORT Former American Forest Products Facility Stockton, California URS Protect No. 17322736 Dear Mr Wong On behalf of Mr William Bergvall, consultant for American Forest Products Company LP, URS Corporation Americas (URS) is submitting this letter report that includes results of third and fourth quarter groundwater monitoring conducted in September and December 2004 at the Former American Forest Products Facility, Stockton, California (Figures I and 2) Groundwater monitoring was conducted, and this report produced, following the requirements presented in a letter from Mr Jeffrey Wong of the San Joaquin County Public Health Service (PHS/F,HD) dated April 16,2003 With this report, four quarteis of groundwater monitoring and reporting have been completed incorporating monitoring wells DMW-S and L°MW-9 These monitoring wells were installcd to assess the vertical and lateral extent, concentration, and changes in concentration with time of 1,2-dichloroethane (1,2-DCA) in groundwater Assessment of this site constituent has been required by the regulatory agene,ws prior to site closure The data presented in this report shows low concentrations, limited extent, and a stable to declining trend in concentrations of 1,2-DCA On this basis this report includes a request that closure procedures be initiated for this site For the third quarter 2004 groundwater monitoring event water levels were measured and groundwater samples were collected from site monitoring wells DMW-1 through DMW-5, and DMW-7 through DMW-9 on September 30, 2003 Monitoring well DMW-6 could not be sampled in September due to lack of sufficient recovery For the fourth quarter 2004 groundwater monitoring event water levels were measured on December 22, 2004 and groundwater samples were collected from site monitoring wells DMW-1 through DMW-9 on December 23, 2004 Well construction details for all of the wells are included in Table 1 Field records and chain-of-custody forms are included in Appendix A A Data Validation Summaries and analytical laboratory reports are included in Appendix B FIELD METHODS Static water levels (Table 2) were measured prior to initiating sampling activities using an electric water level sounder Prior to sampling, the wells were purged to ensure representativeness of the water samples A 2-inch- diameter Grundfos submersible pump was used for purging all of the wells with the exception of DMW- 6, WlikkawaMpurged using a bailer Purge rates ranged from I to 4 gpm Field parameters (temperature, Crown Corporate Center 2870 Gateway Oaks Drive Suite 300 Sacramento CA 95833 Tel 916 679 2000 Fax 916 679 2900 GVOBIAFP\Quarterly1Q40414Q04AFP_rev01 doc