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�,orni. a% a final Water Quality Cont. A Board ��^
<br /> UL 7L ,u entral Valley Region `
<br /> AI}r 9 R� inns Karl E. Longley,ScD,P.E.,Chair `' �°"'Y`
<br /> Linda S.Adams Arnold
<br /> Secretaryjor F � ,� Sacramento Main Office Schwarzenegger
<br /> Environmental NV'(�0}VlbViUb (�gj4*Drive#200,Rancho Cordova,California 95670-6114 Governor
<br /> Protection PE,9Mj[/SE9�/}C`CPhone(916)464-3291 •FAX(916)464-464
<br /> http://www.waterboards,ca.gov/centralvalley
<br /> 22 August 2007
<br /> Ms. Kerry Heckman
<br /> Connell Tire
<br /> 2211 North Wilson Way
<br /> Stockton, California 95205
<br /> DOCUMENT REVIEW, FORMER RIVER CITY PETROLEUM & FORMER CONNELL MOTOR
<br /> LIFT TRUCK, 2211 NORTH WILSON WAY, STOCKTON, SAN JOAQUIN COUNTY,
<br /> MONITORING AND REPORTING PROGRAM NO. R5-2005-0827
<br /> I reviewed the 16 August 2007 Quarterly Report— Second Quarter 2007 (Report) submitted on
<br /> your behalf by Advanced GeoEnvironmental, Inc. (AGE) to the Regional Water Quality Control
<br /> Board — Central Valley Region (Regional Board). Forty-eight (48) groundwater monitoring
<br /> (screened from 40 to 245 feet below ground surface or bgs), four air sparging, and one vapor
<br /> extraction wells were sampled in May 2007. Maximum groundwater constituent
<br /> concentrations were Total Petroleum Hydrocarbons as gasoline (TPHg), 25,000 micrograms
<br /> per Liter (ug/L); TPH as diesel (TPHd), 18,000 ug/L; benzene, 56 ug/L; toluene, 54 ug/L;
<br /> ethylbenzene, 2,000 ug/L; xylenes, 7,700 ug/L; ethylene dibromide, 200 ug/L; and
<br /> 1,2-dichloroethane, 250 ug/L. Depth to water varied from 42 to 44 feet bgs. A Soil Vapor
<br /> Extraction (SVE) treatment.system has operated at the Site since November 2004. The
<br /> Report states SVE did remove approximately 100 gallons of TPHg during the second quarter
<br /> of 2007, has removed approximately 3,500 total gallons of TPHg since 2004, and provides a
<br /> graphic representation of declining SVE influent concentrations in Appendix G. An Air
<br /> Sparging system was added in April 2007 as a pilot study, to reduce dissolved constituent
<br /> concentrations in groundwater. The Report concludes that constituent concentrations are
<br /> declining.
<br /> The Report recommends reductions in the analytical suite for monitoring wells where analytical
<br /> results have been consistently non-detect for specific constituents, and the continued
<br /> operation of the SVE/AS system.
<br /> Comments:
<br /> i. The Report shows that the analytical list for several wells was reduced, such that
<br /> groundwater constituents detected in the previous two quarters were not reported in this
<br /> latest quarter. For example, analyses of groundwater from vapor extraction well
<br /> VW-14B reported the fuel oxygenate tertiary amyl methyl ether (TAME) during the
<br /> previous two quarters (190 ug/L and 220 ug/L, respectively), however this quarter none
<br /> of the fuel oxygenates were reported for that well. Similarly for monitoring well MW-3,
<br /> TPHg, benzene, toluene, ethylbenzene, xylenes, and TAME were detected in the
<br /> previous one to two quarters, but were not reported this quarter. Therefore, those
<br /> constituents with any detection within the last 4 consecutive quarters of sampling must
<br /> continue to be sampled and reported. If no detections have occurred within the last
<br /> 4 consecutive quarters, then you may reduce the list of analytes per well to those
<br /> California Environmental Protection Agency
<br /> Qa Recycled Paper
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