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' 05/17/2000 08 52 2094693433 FIFTH FLOOR PAGE 03 <br /> Q <br /> STEPHEN VALEN fNE CO) `1� <br />' 2315 EL DORADO,PAGE 2 <br /> hydrogeologtcal conditions both at and away from the source point,a comprehensive well <br />' survey,knowledge of anypumpmg influence,the contarammt mass flux,and observations <br /> m the field <br />' The work plan stated that further vertical investigation,is not warranted until more quarterly <br /> monitoring sa aTlmg and analyses are performed. The work plan cited GT'I's experience <br /> "that groundwater samples from deep momtorang wells will often reach=cn-detect levels <br /> after four or five monitoring events". The work plan did not provide anyexplanarion of the <br /> causes for these reductions <br />' PHS/EHD agrees to postpone further vertical mvestigataon at thu tune PHS/EHb <br /> xecoamiands two additional quarters of monitoring events (mcluding the most recent <br /> sampling event on Mayo,2000) before considenng if addtaonal vertical mvestrgauon.is <br />' <br /> required Any lateral invesugatton off site should occur only after the vertical extent of the <br /> contarnvnauon has been defined. <br />' You are approxumtely 3 months behind in your quarterly monitoring and reporting <br /> schedule The last quarterly momtaiang event was conducted ori December 15, 1999,and <br /> the corresponding report, GrraaxhwerMavft r Report 4' Quoter 1999 dated January 19, <br /> 2000 prepared byGTI,was received by this office on Januaty 21, 2000 Since then,the wells <br /> were riot sampled again until Mayo, 2000 Uader California Code of Regulations,Title <br /> 23,Division 3, Chapter 16, Underground Storage Tank Regulations, Section 2652(d), <br /> you are requaed to submit reports to the Local agency(this office) 'every three months or <br />' more frequently as specified by the agency" <br /> According to Appendix A of Tri-Regional Board Staff Recommendations, a survey of wells <br />' wrthux 2000 radial feet of the site should be conducted once groundwater is confirmed to be <br /> contarnmated in a letter dated Apnl 20, 2000 to your consultant GTI,PH5/EHD stated <br /> the conductance of this well survey does not require prepamuon of a work plan.. PTdS/EED <br /> further mcornmends this well survey be included in the 15c or 2%ld quarter monitoring report <br /> of 2000 not in a separate report <br /> If you have any questions,please contact Jeffrey Wong at (209) 468-0335 <br /> Donna Heran,RENS,Director <br /> Envsronrnental Health Divisioa <br /> 1 C. <br /> effreW,REHS �J Margaret gorio,REI-3S <br /> J Y g <br />' LOP/Site NEdgauon Unit IV Surpervisor <br /> Cc CRW QCS, Central Valley legion—Marty Hartzell <br />' Fax- Geological Technics, Inc -Raynold I Kablanow <br />