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1117 Lone Palm Avenue <br /> ENVIRONMENTAL HEALTH DTVI N Suite B <br /> 304 E.Weber Ave.Third Floor N.s Modesto, CA 95351 <br /> P. O. Box 388, Stockton CA 95201-0388 209.579.2221 <br /> Approved <br /> Fax .209.579.2225 <br /> � <br /> A s s o c I A T e s I N C . Denied ❑ � <br /> Conditions ��, t') <br /> Date i by <br /> July 12, 1999 �/ Mo VSc— NSPuc C—P\ 5 i'oR 7-H <br /> C- <br /> 54.62574.0002 (JELL To i3C- 1'(jMpeD +1MD WZtCS 7b <br /> BC O&S&2v C E). KC-CoR D A z ✓FHz/o us _' <br /> Mr. Jeff Wong I/t)reeuALs -ro Prov vc AtOPcc- Df1Ti4J'a/N,S <br /> San Joaquin County Public Health Servicesr-6R at- r(H et s CoRuE AwD <br /> Environmental Health Division fl(2Hw0OWN 1!tuAL-yslsejtjPloptCcopirK-SA(OB <br /> � G��PIi 7 a SArPLE- AT 5- 0av11vrr12vAL fPD <br /> 304 E. Weber Avenue, 3rd Floor LTJ' 0CFOA-r SHkJULD /AJCLuvF- MT EACH S�Wr-1C- 1'JTC.y 11*6LC6ICAL <br /> Stockton, CA 95202 -mrsts GnNoloR7 Coope LArT CGEoP�B�� <br /> 3Hcob grd�Cysi 5 , u1 N O 5ECECTIDN a� SA/tiPtEs <br /> 01-Y �LC oNfnM�Nr EXf T �IV!'P/` To BE/vNA'v/2- D <br /> C�-idrNC . . pq T /NCL.UD[ <br /> Subject: Workplan for Pumping Test and Subsurface Investigation at &iths Canaf ump pHs/6HD <br /> Plant, Fontana Street and Smiths Canal, Stockton, California, Site Code 1102 (r>"MCnr <br /> • /9.0 D <br /> R c,tiFi�1&,0 T <br /> Mr. Wong: <br /> ATC Associates Inc., on behalf of the City of Stockton, has prepared this workplan for <br /> performing a pumping test and a subsurface investigation at the subject site (Figure 1). This work <br /> was discussed in a meeting between San Joaquin County Public Health Services Environmental <br /> Health Department (PHS/EHD) and City of Stockton County on March 29, 1999. This work is <br /> being performed to evaluate the stability of the free product plume and determine if the plume is <br /> declining. ATC will perform a 24-hour pumping test followed by the advancement of additional <br /> soil borings to quantify the free product plume. The results of the pumping test and soil boring <br /> advancement will be used to complete mass balance calculations and prepare recommendations <br /> for the site. The following paragraphs contain a detailed description of the scope of work to be <br /> performed. <br /> BACKGROUND <br /> An estimated 1,100-gallons of diesel fuel reportedly leaked from a 5,000-gallon fiberglass tank as a <br /> result of an inadvertent puncture. The tank was repaired and returned to active service until it was <br /> removed in February 1992. When the tank was removed, free product was noted floating on the <br /> groundwater within the excavation. <br /> Subsurface investigations were performed at the site in May 1988 by Ensco Environmental, in October <br /> 1989 by WaterWork Corp., and in August 1993 by RESNA Industries Inc. A total of eleven borings <br /> (13-1 and SB-I through S13-10) were advanced at the site and six monitoring wells (MW-1 through <br /> MW-6) were installed at the site to evaluate the extent of impacted soil and groundwater. Soil was <br /> found to be impacted between 7 feet and 18 feet below ground surface(bgs)(RESNA, March 1994). <br /> Quarterly groundwater was initiated at the site in March 1992. Benzene, toluene, ethylbenzene, and <br /> xylenes (BTEX) were consistently nondetect in all wells except MW-4, which contained free product. <br /> Analysis for BTEX constituents was terminated after first quarter 1997. Concentrations of total <br /> w:\62574\62574.02\reports\pumpwkp.doc 1 <br />