Laserfiche WebLink
-1114% California4legional Water Quality Coigol Board _,,p <br />Central Valley Region <br />Karl E. Longlev, ScD, P.E., Chair �hi ru•x;- � <br />Linda S. Adams 11020 Sun Center Drive #200, Rancho Cordova, California 95670-61 l4 Arnold <br />Secretary for Schwarzenea <br />Environmental Phone (916) 464-3291 • FAX (916) 464-464 eger <br />http://www.waterboards.ca.gov/centralvalley (� i7 r �,� Governor <br />Protection {l_�, U <br />18 August 2008 <br />AUG t 9 2008 <br />ENVIF;(Jl� MLIr T HEALTH <br />Mr. Eric Jenks <br />John Taylor Fertilizers PERfU11T/SERVICES <br />900 North George Washington Blvd. <br />Yuba City, CA 95993-9062 <br />REVIEW OF THE FIRST QUARTER 2008 SEMI-ANNUAL GROUNDWA` S?MONITORING <br />REPORT, JOHN TAYLOR FERTILIZERS CO. STOCKTON, SAN JOAQUIN COUNTY <br />Staff of the California Regional Water Quality Control Board, Central Valley:Region (Regional <br />Water Board) have reviewed the May 2008 Results of First Quarter 2008 SBmi-Annual <br />Groundwater Monitoring Report (Report) for the subject site, located at 1813 South Argonaut <br />Street in Stockton, San Joaquin County, California. The Report was prepared on your behalf <br />by Geosyntec consultants. <br />The Report provides results from groundwater monitoring and sampling acties that were <br />conducted at the Site in February 2008. <br />Regional Water Board staff comments on the Report are provided below. <br />In the report you have mentioned that the analytical results from the February 2008 <br />sampling event are summarized in Table 3, however, the RegionalVfter Board staff <br />did not observe the results from February 2008 or August 2007 everdin the referenced <br />table. For future reporting, please update Table 3 showing historical -rd current <br />monitoring and sampling results. <br />2. Staff concur with Geosyntec's recommendation to continue monitorir.7g of groundwater <br />for total oxidizable nitrogen (TON) based on the time series plot of TON concentrations <br />which shows declining trends in all seven monitoring wells across the Site. <br />3. Elevated levels of 1,2,3-trichloropropane (1,2,3 -TCP) have been fourtin the <br />groundwater beneath the Site. Maximum concentrations of 1,2,3 -Tap were detected in <br />MW -4, which is located downgradient of Shop Number 2 and Shop(nber 3. <br />Concentrations of 1,2,3 -TCP have been fluctuating between 6.5 pg/Land 0.15 pg/L in <br />MW -4 since the July 2005 monitoring and sampling event. These coixentrations are <br />above water quality objectives, and JTF needs to locate the source -area for 1,2,3 -TCP. <br />Since 1,2,3 -TCP is a volatile compound, its presence is not always ratified with soil <br />sampling methods. Although the soil investigation JTF conducted ;in1999 did not <br />reveal a significant source area for 1,2,3 -TCP, JTF must follow up Wi%a soil gas survey <br />before Regional Water Board staff can concur that a source area is: present. Soil <br />gas sample locations should encompass an area extending, at a rriiriiinum, 100 feet <br />California Environmental Protection Agency <br />C3Recycled Paper <br />