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ATERORK <br /> r� � GEOC:Fif_M4CAL 0 GEOTECHNICAL•ENVIRONMENTAL <br /> November 16, 1990 { �� ..:f,- -, k:a P�.� , <br /> Ms. Diane Hinson N 0V 2 I'4io <br /> San Joaquin County E�iV�'... 1`:1 � t;EALTH <br /> Department of Environmental Health PE���,�17'i` E�t'+llCCs <br /> P.O. Box 2009 <br /> Stockton, Ca 95201 <br /> Re: 1990 Third Quarter Monitoring Report, 8181 East <br /> Eleventh Street, Genstar Western Stone, Tracy, CA <br /> Dear Ms. Hinson: <br /> f This letter is to report the groundwater monitoring activities <br /> during the third quarter of 1990 at the above referenced site and <br /> also address the issues presented in your letter of October 15, <br /> s 1990 (Figure 1 ) . <br /> n c* <br /> Activities during the quarter have included the purging of the <br /> I wells, sampling for benzene, toluene, ethylbenzene, xylenes <br /> (BTEX) and total petroleum hydrocarbons as diesel (TPHD), and <br /> rX monitoring of groundwater. <br /> Groundwater monitoring was conductel on October 30, 1990. Depth <br /> to water was measured for each well (Table 1 ) and a groundwater <br /> gradient map was created using a kriging program (Figure 1) . The <br /> water elevation is approximately three feet lower than when the <br /> elevation was measured in October of 1989. Groundwater flows at <br /> approximately 0.004 ft/ft in a northwesterly direction. <br /> Groundwater samples were collected, and analyzed for HTEX and <br /> { TPHD using EPA 8015/8020 methodology (Table 2). Samples are <br /> collected after alp parameters for pH, conductivity and <br /> temperature have stabilized. No concentrations of HTEX and TPHD <br /> were detected above method detection limits in any of the wells. <br /> Laboratory reports, development purge logs, and chain-of-custody <br /> are presented in Attachment 1. <br /> II' ADDENDUM TO PAR OF JUNE 22, 1990 <br /> Section 2.8 <br /> i <br /> in response to your letter of October 15, 1990 we have conducted a <br /> well search for private, municipal and domestic wells within a <br /> cane-mile radius of the site. Well locations are presented on <br /> Figure 2. <br /> :f <br /> 1710 MAIN STREET • ESCALON,CA 95320 6 (209)638-3507 <br /> FRESNO,CA(209)222-3495 n RENO, NV(702) 7B8-6830 <br />