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UBLIC HEALTH SE ES <br /> SAN JOAQUCN COUNTY <br /> :< <br /> JOGI KHANNA.1M.D.,MT H <br /> Health Officer :¢ <br /> ko. .OXI 09 4(1Sfll Eaast.H.Wjt.,Avenue) •Stockton,Ciii#apili 95201 <br /> (2t ):4"341x) k <br /> ,E 16 1991 <br /> R6BB.ERT .$ERG A <br /> C9LQR SPOT INC.. <br /> P,`G. BCi�€ 5tJI1 . <br /> RICHMOND CA 948:05 <br /> i <br /> a <br /> REt Cb or Spot IN REPLY RESER Tf? SITE CCy�Es X343 <br /> 5400 E. Harney Lana r <br /> Lod <br /> We,hava raViewed the "Supplemental Site Assessment" Report prepared ; <br /> by Staal, Gardner and C►unn , :Inc;. dated November, 1' 90. . The field. <br /> .activities: performed t3ctokser 8th and 9th, 1990, : have failed to <br /> provide quantitative data 'for the consideration of site closure. <br /> In: addition, site drilling was conducted without the required grout <br /> it spection' (Sari. Joaquin. County We11 Ordinance 1862) , <br /> Deviations from. the. technical work plan dated June, ` 2990 were not <br /> discussed with. Public Health services, Environmental Health. <br /> Division (PHS/EHD) staff. prior to implementation: <br /> San Joaquin County Flood Control maps document regional: gradient to <br /> theysou.thwest :at depths ofj; 50-60 feet during the seasonally high <br /> tyear of 1986. !Stam, Gardier and Lunne's report states "a perched <br /> water - body was encountere3 at a depth of 64 feet" during the ; <br /> construction of MW#1. Th`e assumption made during the drilling : <br /> activity that this encountered water was perched ` and that <br /> groundwater exists at a depth greater than 90 feet, cannot be <br /> substantiated based upon Iregional water documentation. This <br /> inappropriate assumption could have been avoided. <br /> The `11grab" water sample extracted through the hallow stem auger may <br /> be used as a screening method, but cannot provide water quality <br />' data-f ,• .. . <br /> Therefore, Color Spat, Inc. is directed to completes the required. <br /> site assessment to determine the full extent of the soil and/o <br /> groundwater problem. l <br /> Color, Spot, Inc, shall #subrinit within 30 days from the date of the <br /> letter a technical: work,ii ;plan following "Tri-Regional Staff' <br /> Recommendat ons " Appendix11A Guidelines for thepreparation of a ! <br /> Prol?lem Assessment Report, due within 90 days from the date of this. ;. <br /> j letter. <br /> �i <br /> i <br /> i. <br /> Ilivisdat. Lt COWRY Health Care Services <br /> t;San.Jttaglt is <br /> . A" ra <br />