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Wm. J. Hunter & Associates cNTRONIAE14� t\'-NEAI_Tll 2220 Loma Vista Dr <br /> Registered Geologists ��jjj S�-"RVICE Sacramento, CA 95825 <br /> �oleum & Mineral Appraisers ` 30 (916) 972-7941 <br /> 55 ,SAN 2� FAX (916) 972-1683 <br /> September 21 , 1994 <br /> Michael Collins , REHS <br /> San Joaquin County Health Department <br /> Environmental Health Division <br /> 445 North San Joaquin Street <br /> Stockton, Ca 95202 <br /> Ret Sixth Quarterly Groundwater Monitory ng Re_j?.ort, for 814 E_ <br /> Charter Way. Stockton Site Code 1061 <br /> Dear Michael , <br /> We am enclosing a copy of the field report, water analysis, and <br /> gradient map for the above property The work was performed on <br /> July 29, 1994 by Del-Tech Geotechraz_caJ Support Services as <br /> directed by our office <br /> The attached map, (EXAIBII A, ) shows the gradient as measured <br /> during the latest sampling period, as well as the directions <br /> indicated by prior data All of the measurements indicate a <br /> rather stable hydraulic gradient to the ortheast This is <br /> • consistent with both regional data and that measured at the <br /> Darpetro site to the northeast of the; Morita property <br /> A summary of all of the laboratory analyzes of water samples <br /> taken since monitoring began in October, 1992, is included as <br /> TABLE I <br /> Based on the gradient data obtained to data , monitoring well #2 <br /> is downgradient from both the site of the removed UST' s and the <br /> pump island Wells #1 & 1t3 are on strike with, (paraJlel to, ) <br /> the gradient , and a considerable distance from those sites MW-1 <br /> has consistently recorded low levels of BTRX & TPH-G since moni- <br /> toring began, the latest sampling showed only Toluene was above <br /> detection levels MW-3 , which is the farthest from the tank <br /> site , had recorded varying amounts of B'fEX, and the highest <br /> levels of TPH-G during prior samplings However, the latest <br /> tests showed all components were below detection levels , the <br /> first time that has occurred MW--2, which is in a downgradient <br /> position, has recorded varying levels of B`1'EX & TPH-G The <br /> latest sampling showed that well to have significantly higher <br />�r levels of all components compared to the other two wells <br /> Although these readings are fairly conL�i :�tent with gradient data, <br /> the ongoing activities associated with the DarPetxo investigation <br /> nearby may be influencing the movement of the groundwater in this <br /> area <br />