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INTRODUCTION GHH Engineering,Inc (GHH) is currently providmg Ms Lynn Swanson professional environmental services to conduct groundwater monitoring for the Colberg Boat Works (Colberg) project located at 401 North Stockton Street, Stockton, California, as shown on Figures 1 and 2 Ms Swanson has authorized GHH to prepare this No Further Action Request(NFAR) for the site This report has been prepared for subrmttal to the San Joaquin County Environmental Health Division(County),the lead regulatory agency overseeing environmental issues at the site The Tn-Regional Guidelines Appendix B Checklist summarizing this report is contained in Appendix A Site Description The subject site is located in the western portion.of Stockton., San Joaquin County, California, at an elevation of approximately 10 feet above mean sea level The site contains several marine service warehouse/storage buildings on approximately three acres of land and is located to an mdustrial area of Stockton, California(Figure 1) The site is nearly level and is bordered by the Stockton Deep Water Channel to the south The site is a former ship yard which is no longer active,with the exception of limited boat storage(Figure 2) Site History On May 16, 1986, Jim Thorpe Oil,Inc removed two 550-gallon diesel, one 8,000-gallon diesel, and one 1,000-gallon gasoline underground storage tanks (USTs)from the site The area around the former gasoline UST was over-excavated in 1988 In February 1993, Tehc Engineering Corporation(TEC) of Stockton, California,performed a Phase I investigation of the subject site and surrounding area within a one-mile radius TEC's findings are summarized in their report,Phase I Preliminary Hazardous Materials Site Assessment, dated July 21, 1993 On December 12 and 13, 1994,Envirotech,Inc (Apex)of Fair Oaks, California supervised the advancement of 11 subsurface probes to collect soil and groundwater samples at the site The results of the subsurface investigation are summarized in the report,Phase II Site Assessment Report, dated January 23, 1995 The results of the subsurface investigation indicated that areas around the former USTs were impacted by petroleum hydrocarbons Subsequently, Colberg was directed by the County to perform further investigations at the site This investigation was performed according to Apex's Workplan for Limited Subsurface Investigation and Workplan Addendum for Limited Subsurface Investigation dated May 2, 1995 and January 24, 1997,respectively, as approved by the County On July 28 and 29, 1997,Apex supervised the drilling, soil sampling and installation of six groundwater monitoring wells at the site at the locations shown on Figure 2 Six soil borings (SB-1 through SB-6)were drilled and completed as groundwater monitoring wells (MW-1 through MW-6) The soil boring drilling and monitoring well installations were performed by Woodward Dnllmg Company of Ilio Vista, California.