Laserfiche WebLink
' Wm. J. Hunter & Associates 2220 Loma Vista Dr <br /> Registered Geologists Sacramento, CA 95825 <br /> Petroleum& Mineral Appraisers (916) 972-7941 <br /> FAX (916) 972-1683 <br /> INTERIM ASSESSMENT -REPORT _AND RESULTS OF GROUNDWATER <br /> INVESTIGATION - 1876 COUNTRY CLUB DRIVE, STOGRTON, CA <br /> ' (SITE CODE 1844) <br /> Prepared for <br /> San Joaquin County Public Health Service <br /> ' Environmental Health Division <br /> by <br /> ' Wm_ J. Hunter & Associates <br /> October, 1994 <br /> ' <br /> PURPOM OF WO <br /> In April, 1993, three (3) groundwater monitoring wells were <br /> placed on the above property for the purpose of quantifying the <br /> extent of soil & water contamination encountered during the <br /> removal of 2 UST' s in 1989. The tanks, which had been used for <br /> storing gasoline, had been out of service for many years prior to <br /> ' their removal. <br /> Soil & water samples from those wells revealed the presence of <br /> petroleum compounds in varying amounts. Quarterly monitoring <br /> since installation of the wells continues to show detectable <br /> levels of BTEX & TPH-G in water samples from all three wells <br /> Although the groundwater gradient has been generally to the north <br /> ' & east, KW-1 , in an upgradient position, has consistently <br /> recorded the highest levels of contamination_ In an effort to <br /> determine if an offsite source exists to the north-northwest, a <br /> ' detailed title search of the area was made_ The results did not <br /> indentify such a possible source. <br /> A soil-gas vapor survey was performed on the property, (refer to <br /> ' that report for details, ) which showed that the contamination was <br /> restricted to the northwest portion of the property, consistent <br /> with groundwater monitoring results. <br /> ' Because the lateral extent of groundwater contamination had not <br /> been defined, and an offsite source could not be identified, the <br /> ' San Joaquin County PAS Environmental Health Division required <br /> that additional wells be placed in an attempt to identify a 'zero <br /> line_ " Refer to EXHIBIT A for a copy of that letter. On August <br /> 4, 1994, a workplan was prepared by Wm. J. Hunter & Associates, <br /> (WJH, ) to place two (2) additional wells on the property in an <br /> effort to achieve that objective. A copy of that workplan is <br /> included as EXHIBIT B. The results of that work is described in <br /> ' this report_ <br /> PROPERTY ADDRESS= <br /> 1876 Country Club Drive, Stockton, CA <br /> ' 1 <br />