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MNA WATERWORK CORP. <br /> INDUSTRIES <br /> April 2, 1991 <br /> and a zar .m APR 2 3 "171 <br /> EINVIRONINAFNTAL HEALTH <br /> PERMIT/SERVICES <br /> Ms. Diane Hinson <br /> 5 v E 3 San Joaquin County Public Health Services <br /> 0 l EnvironmantiHealth Division <br /> W r, cc <br /> P.O. B= 2009 <br /> Stockton, CA 95201 <br /> B <br /> • 1991 ZecanTnuarter Report-Tri-Valley Growers, <br /> W Re. <br /> Z 26200 Nowell Road, Thoreton, CA. <br /> < <br /> cb <br /> ul <br /> Dear Diane: <br /> Y, P % i at Tri-Valley Grower's <br /> .0 This letter report updates the activities <br /> < second quarter of 1991. Activities <br /> -2 Thornton plant during the <br /> Z C11 dissolved hydrocar- <br /> < during the quarter have included sampling for d <br /> + <br /> Cr Cr <br /> bons and monitoring of groundwater. <br /> Z <br /> < <br /> cc cc Groundwater monitoring conducted in January, February, and March <br /> CC 0 showed the water table has risen from 2.3 to 3.4 feet during the <br /> 0 _SH3N1VJLN00 N quarter (Table 1). The groundwater contour maps (Figures I-3) show <br /> e 1) has shifted <br /> Uj the direction and magnitude of the gradient (Tab! <br /> from a westerly direction last quarter to <br /> shifted <br /> Ir a southwesterly <br /> has <br /> 13 <br /> 8 .8"�% Mu direction. While the direction of the gradientwith <br /> 0 0 Lu <br /> Z _j slightly the gradient magnitude has fluctuated significantly <br /> 0 <br /> P a minimum of .0047 ft/ft in January and a maximum of .023 ft/ft in <br /> February. it appears that the shallow groundwater at the site may <br /> including <br /> -01 be responding to non-precipitation related effects <br /> CD 0 <br /> river/tidal stage and local pumping. The groundwater monitoring <br /> 0 Z <br /> .1 summarized in Table 2. <br /> 0 results are <br /> Z P <br /> (D <br /> Groundwater samples Z E E les were collected from the six wells on March 7, <br /> P 1991, for analysis of benzene, toluene, ethylbenzene, <br /> xylenes <br /> a (BTEX) and total petroleum hydrocarbons as gasoline (TPHG), by EPA <br /> 1% 1 sampled <br /> MWl was sa <br /> methods 8015/8020. in addition, monitoring well, <br /> hod 5520 C & F. Sampling was done <br /> for oil and grease by EPA met <br /> -!Z 2 tical (DOHS Cert. <br /> 0400 61 using dedicated pumps in each well. Applied Analytical 8 <br /> J W the analyses. Laboratory results continue to <br /> 2 r 1211) performed of gasoline hydrocarbons. <br /> Uj F 1-4 show MW4 with moderate concentrations 5. Oil and grease <br /> Low concentrations of xylenes were recorded in MW <br /> I W 7. levels in MW1. The results <br /> concentrations -were below detectable <br /> and - the laboratory--reports-reports- and <br /> are summarized in __Table - 3-,- -a <br /> L4 presented in <br /> chain-of-custody documentation are pr attachment 1. <br /> .9 17'.0 MAIN STREET * ESCALON,CA 95320 e (209)838-3507 <br /> :3 8)496-1249 <br /> Cr SANTA CLARA,CA (40 <br /> 2350-A WALSH AVENUE <br /> CL <br />