|
ity Control Board
<br /> California Renal Water Qual
<br /> Central Valley Region
<br /> Robert Schneider,Chair
<br /> Winston H.Hickox -\\ Gray Davis
<br /> Secretaryfor Sacramento Main Office -, �\ t',. �''V Governor
<br /> Environmental Internet Address: h[tp://wwwswrc �
<br /> Protection 3443 Routier Road,Suite A,Sacramento, 003 q
<br /> Phone(916)255-3000•FAX(9 ) 3015 1 V
<br /> j3
<br /> 29 October 2003 ENV R�NM S Rv�K\I�k
<br /> Mr. Cecil Dillon Mr.Richard Bokides PERI Mr.Navtej Dhingsa
<br /> Flag City Ltd. Partnership Bokides Family Ltd. Partnership First Investment Flag City,Inc.
<br /> 1820 W.Kettleman Lane, Suite E 6421 Capitol Avenue 517 Coronawood Lane
<br /> Lodi, CA 95242 Lodi,CA 95242 Carmichael, CA 95608
<br /> REVIEW WORK PLAN ADDEND UM, FLAG CITY CHEVRON, 6421 CAPITOL AVENUE,LODI,
<br /> SAN JOAQUIN COUNTY, CLEANUP AND ABATEMENT ORDER(C&A)NO. 5-00-700
<br /> I reviewed the Work Plan Addendum, Cleanup and Abatement Order No. 5-00-700(Workplan); dated
<br /> 17 October 2003, submitted on Chevron's behalf by Advanced GeoEnvironmental,Inc. (AGE). The Workplan
<br /> proposes to investigate the source of the Methyl Tert-butyl Ether(MtBE) spikes in groundwater monitoring well
<br /> MW-8A. The Workplan states analysis of MW-8A, screened 40 to 50 feet below ground surface (bgs) in a
<br /> medium sand,reported MtBE from March 2002 (700 µg/L)through September 2003 (290 gg/L). Prior to March
<br /> 2002, seven quarters of groundwater analysis of MW-8A did not detect MtBE(<0.5 µg/L). Groundwater
<br /> analysis of deeper aquifer zones, at MW-813 (95-105 feet bgs) and MW-8C (130-150 feet bgs),have not detected
<br /> MtBE. The Workplan proposes drilling five additional soil borings and collect discreet grab groundwater
<br /> samples at 20, 30,40,and 50 feet bgs. Four of the soil borings are located onsite around MW-8A, and one boring
<br /> is located offsite on Banner Avenue. Depth to water is 10 feet.
<br /> I concur with the Workplan with the following conditions. Figure 3,the cross-section, shows that two clay/fine
<br /> sand contacts occur at 12 feet and 22 feet bgs. Please take grab groundwater samples in the zones with higher
<br /> porosity(sands), or provide the rationale why taking grab groundwater samples in the clay intervals would be
<br /> useful in the investigation. Include a grab groundwater sample in the sand at the water table (approximately
<br /> 12 feet bgs). If there is field evidence of groundwater contamination at the Banner Avenue boring location,
<br /> install a monitoring well per prior approved workplan(s).
<br /> Please apply for required permits from San Joaquin County Environmental Health Department(SJCEHD) and
<br /> provide at least 72 hours prior notice, so that SJCEHD and I may be present for the fieldwork. You may contact
<br /> me a'(91')
<br /> t(916) 255�-3-115—witlthany questions or comments.
<br /> ames L. Barton, R.G.
<br /> Engineering Geologist
<br /> cc: Mr.Mark Owens,UST Cleanup Fund, SWRCB, Sacramento
<br /> Mr. Mike Infuma, San Joaquin County Environmental Health Division, Stockton
<br /> Mr. Timothy J. Cuellar,Advanced GeoEnvironmental,Incorporated, Stockton
<br /> Mr. Scott Rishwain,Rishwain&Rishwain, Stockton
<br /> Mr.Ben Guzman, San Joaquin County Municipal Utilities, Stockton
<br /> California Environmental Protection Agency
<br /> %d Recycled Paper
<br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption.
<br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://w .swrcb.ca.gov/mgcb5
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