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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Donna K.Hera n,R.E.H.S. Unit Supervisors <br /> N: X Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> • c4.. �P • Program Manager Douglas W.Wilson,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Fax: (209) 464-0138 Robert McClellon, R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> TRUST OF MARY GARDELLA ESTATE OF JOE GARDELLA <br /> WINIFRED ALEXANDER DENNIS CASPE ESQ <br /> 525 2"D ST 2035 N PACIFIC AVE <br /> SANTA CRUZ CA 95060 SANTA CRUZ CA 95060 <br /> RE: STEFANOS GASOLINE <br /> 1419 E CHARTER WAY <br /> STOCKTON,CA 95205 <br /> WORKPLAN: Monitoring Well Installation Workplan.Addendum <br /> DATED: June 26 2003 <br /> PREPARED BY: Wri ht Environmental Services Inc. <br /> X APPROVED with Conditions (See Below) <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN (H&S <br /> 25299.37,subd.(c)(3).): <br /> 1. Install three cone penetrometer (CPT) borings off-site to at least 119 feet below surface <br /> grade (bsg) to provide geological data. <br /> 2. Install one monitoring well to 65 feet bsg and one monitoring well to 119 feet bsg on <br /> site. Multi-chambered monitoring wells may be installed instead based on the new CPT <br /> data and previously collected geological data. <br /> 3. Install two monitoring wells to 65 feet bsg on adjacent parking lot to the east of the site. <br /> Multi-chambered wells may also be considered based on new CPT data. <br /> 4. Install one c-sparge"bubbler"well and an ozone generator system near MW-2 to <br /> address the contamination in groundwater. (See condition below) <br /> 5. Install one soil vapor extraction (SVE) well near M%V-2 to address the contamination in <br /> the soil. (See condition below) <br /> COMMENTS AND CONDITIONS: <br /> 1. The primary purpose of the new CPT investigation of this site is to provide specific <br /> geological information to determine where to place the screen interval for the proposed <br /> monitoring wells (multi-chambered or clustered). The work plan proposed using the <br /> CPT to collect grab water samples at 52-57 feet bsg, 114.119 feet bsg,and other strata <br /> based on penetrometer logs. The samples should be collected from a different borehole <br /> than the CPT sounding borehole to prevent potential cross-contamination of the <br /> samples. <br /> 2. The work plan proposed installing the c-sparge"bubbler"well in the 35 to 50 foot zone. <br /> Current depth to water on site is at about 42 feet bsg.,(Feb 2003). The well screen of <br /> the c-sparge"bubbler"well must be completely below groundwater in order to <br /> maximize the micro-sparging characteristic of ozone sparging. Injecting ozone when <br />