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California .oral Water Quality' iotrol Board <br /> y � <br /> Central Valle Region <br /> 1 <br /> Winston 11 Ricicax Robert Schneider, Chair <br /> Gray Davos <br /> Secretary for Sacranimto Main Office Governor <br /> nvrronmet[tal Inter net Address httpJ/www scarab m.-ov/--rwgcb5 <br /> Protection 3443 Routier Road,Sucre A,Sacramento,Cairfamia 45827-3003 <br /> ' Phone(916)255-3000-FAX(91 b)255 3015 <br /> 2 March 2001 <br /> Mr Jeffrey Wong '' � •.�� <br /> Senior Registered Environmental Health Specl.ahst VAR n R 2061 <br /> ' San Joaquin County Environmental Health Division <br /> 304 East Weber Avenue <br /> Stockton, CA 95202 <br /> ' ME T FOR ERI EDIATIO RAINWATER AR WASH <br /> REO UIR.E N .INT �1 REM N, C A5 <br /> 420 WEST YOSEMITE AVENUE,MANTECA, S'AN JOAQUIN COUNTY <br /> Dunng our 28 February 2001 meeting,we discussed the Cone Penetrometer Testing Site Investigation, <br /> 1 Fourth Quarter 2000 and the January 2001 draft sampling results for moiutonng wells MW-I through <br /> MW-4,both submitted by Advanced GeoEavironmental (AGE) Groundwater samples collected from <br /> on-site morutonng wells m January 2001 contained up to 120,000 µg/1 TPHg, 9,900 )Ag/l benzene, and <br /> 730,004 pg/1 MtBE The c=ent depth to water m the on-site monitoring wells is about 17 feet bgs, anal <br /> the reported groundwater flow is nortWnortheast Results of the depth-discrete groundwater samples <br /> collected from the cone penetrometer testing (CPT) borings at 130 feet show MtBE at 39 uel <br /> 1 Tetrachloroethylene and trichloroethylene also were identiEcd w the groundwater samples at maxiinuan <br /> concentrations of 1,600 �Lgn and 28 pg/l, respectively At this time, it is uncertain where the source of <br /> these solvents originated, anal we are greatly concerned that the aquifer, which is used for domestic and <br /> municipal water supply, has been Lmpactcd <br /> As presented to AGE's 8 September 2000 Sensitive Receptor Survey, two m1.ir11mcipal water supply wells <br /> ' are withal 2,000 feet of Rainwater Car Nash One well (Almond Street Well) is about 1,900 feet <br /> northwest of the site and reportedly is non-operational The other well (Jessie Street Well), which 1s <br /> operarfonal, is about 1,540 feet south of the site This well is cased to 100 feet and 'open-hole" from <br /> 100 to 325 feet The reported pumpisig rate for this well is 1,100 gallons per Minute <br /> AGE recommended m the CPT Site Investigation to mstall an interim remediation system to reduce <br /> off site ncugration of the groundwater plume The system is appropriate to reduce contanunant mass and <br /> control the lateral and vertical movement of contaminated groundwater until the completion of the site <br /> assessment Therefore, require Rainwater Car Wash to complete the following <br /> ' G April 2001 install co uo t operate an inte=rn um and treat system in the area <br /> • 13y 1 p and n�tzn us y op pump , <br /> ' of the highest on-site groundwater contarzursatlon The system should remove product and <br /> szabihzc the groundwater plume <br /> California Environmental Proteenyn Agency <br /> �rY Recycled Paper <br /> at a^e-gy 1_'1341en3c acing calitomm is real Every Cal famian aeeds to take immediate action to reduce ene-gy uomampmr 'vr a ust Of sImaie v�« <br /> uik ti-w-educ,e demand ano int vour energy costs,,ee our Web-site 3L hap/(www swrcb ca govi wgcb5 <br />