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2662 N. Wilson Way,Stockton <br /> Harry's Auto Mart,Page 2 <br /> The vertical extent of the contamination in groundwater has not been determined. <br /> PHS/EHD recommends defining the vertical extent of the groundwater plume by using <br /> technologies such as additional short-screen, deeper monitoring wells,or Cone Penetration <br /> Testing with hydropunch.to collect the grab water sample in order to control cross- <br /> contamination. Submit a work plan that will define the lateral and vertical extent of the <br /> contamination in both soil and groundwater by September 20,2000. A 2000 feet well survey <br /> in accordance with Appendix A of the Tri-Regional Board Staff Recommendations must be <br /> performed. Submit the well survey results to PHS/EHD,including a map with the well <br /> locations and any known well construction details, by September 30,2000. <br /> In a letter dated April 5, 2000 PHS/EHD recommended obtaining permission from U Haul <br /> to collect and analyze a groundwater sample from U Haul's MW-7 located on the street <br /> immediately adjacent to the site. MW-7 was not sampled for the preparation of the report. <br /> The report also stated that new properly screened monitoring wells have recently been <br /> installed at U Haul but data of the analyses of the water samples of these wells have not <br /> been released yet. The report recommended that well locations should not be proposed <br /> until additional data from U Haul are reviewed. <br /> According to Addkiwd Site ClaaracterizationReport dated March 21, 2000 prepared byBlaes <br /> Environmental Management,Inc. for the U Haul site,analytical results of the groundwater <br /> sample from NM-7 in February 2000 was 94 ppb of TPH g, non-detect at appropriate <br /> detection limits for BTEX, and oxygenates. Analytical results of the groundwater sample <br /> collected fromNM-7in September 1997 were 3,600 ppb TPH g, and 170 ppb, 8.4 ppb, 27 <br /> ppb,and 15 ppb of BTEX, respectively, and in October 1995 were 5,900 ppb of TPH g,420 <br /> ppb, 17 ppb,74 ppb, and 150 ppb of BTEX, respectively. The screen interval of MW-7 is <br /> from 60 to 85 feet bsg,which is currently below first groundwater level. <br /> PHS/EHD recommends including the latest analytical results of NM-7 in all future <br /> quarterly monitoring reports. If MW-7 was not sampled by U Haul during the quarter, <br /> PHS/EHD recommends contacting U-Haul for the permission to sample NM-7. <br /> Please contact Jeffrey Wong at (209) 468-0335 if you have any questions. <br /> Donna Heran,RENS,Director <br /> Environmental Health Division <br /> Jeffrey Wong , REHS Margareegorio,REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB, Central Valley Region- Marty Hartzell <br /> c: Ground Zero- Greg Stahl <br />