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v <br />DEPARTMENT OF PUBLIC WORKS <br />CITY HALL <br />425 N. EL CORACO STREET <br />STCCKTON, CA 952C2-1997 <br />August 3, 1995 <br />Mr. G. Arnold Inouye, Area Engineer <br />California Regional Water Quality Control Board <br />Central Valley Region <br />3443 Routier Road, Suite A <br />Sacramento, CA 95827-3098 <br />u <br />AUSTIN ROAD LANDFILL: UPDATE ON CITY ACTION`x,'kLT11R,0 <br />TETRACHOLORETHENEi ON <br />MONITORING WELL i' <br />Background <br />In an August 14, 1994 letter to the City the State Office of Real Estate and Design <br />Services (OREDS) reported that they had sampled the Northern California Youth <br />Center (NCYC)agricultural well located about 3500 feet downgradient from the landfill <br />for Volatile Organic Compounds (VOCs) and found some of the same VOCs that are in <br />the landfill plume. They concluded from this that the landfill contaminant plume had <br />migrated and impacted this well. <br />In response to this finding, Mr. Bill Marshall of your office asked the City in an <br />August 17, 1995 letter to resample the State agricultural well and the two water <br />supply wells near it on the other side of Austin Road (see attached Ground and <br />Surface Water Monitoring Locations map). <br />As an alternative to sampling these wells, the City asked Mr.Marshall in an April 4,- <br />1995 meeting for approval to install another plume migration detection well -(MW- 14) <br />between the two existing plume detection wells, MW -12 and W-13 (see attached map <br />for well locations). Doing this would give the City two monitoring wells directly <br />between the landfill plume and the State agricultural well in the direction of <br />groundwater flow. Mr. Marshall verbally approved installation and sampling of -14 <br />at the meeting. <br />On May 22, 1995 we notified you that some of the same VOCs in the landfill plume <br />had shown up in plume detection well TMW-13 monitoring results. We resampled MW - <br />13 on May 24, 1995 and confirmed that two landfill plume VOCs, PCE and TCE, were <br />present in the well although at much lower levels than originally detected. We notified <br />you in a June 27, 1995 letter of the resampling results (copy of letter attached). <br />"'STOCKTON... CALIFORNIA'S SUNRISE SEAPORT„ <br />