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California Heaven I Water Qual"Contml Board <br /> Page 2 <br /> Theodore, the Noah Area investigation was paused with Water Roam approval, until access could be <br /> obtained and an addendum to the Round Work Plan submitted. <br /> Proposed Next Phase of North Area Investigation <br /> Haley &Aldan proposes to advance four (as a 2) far the collection of addttional <br /> depth discretegroundwater samples in �s the Intermediate gruffer b1su known as the MC Zane"). At two <br /> 4 these locations, a well will also be installed in the Clone.no planned sampling locations am their <br /> rationale are described in the sections below. <br /> LOCATION HP118 <br /> orates ad)acentm historical CPTloration MAI, nearme Innervation mElm Avenue and <br /> Pine Stood. Depth discrete samples were collected at location HP11B duringthe initial publication, at <br /> tiepins m28a0, V 92, and 115-120feat burs. mchloraethene (TCE) and rb-1,2eirnwroethene <br /> (cis -RCE) were detected in the Alan andthe upcerpomon of the Clone at concentrations note <br /> 4.0 and 6.8 micrograms per aer(muL), respeeivehy. NO CM were detected in the shallow B Zane. <br /> Haley & Nadch will return to xP112 to collect additional depth discrete groundwater samples deeper in <br /> the Intermediate Aquifer. This data will provide information regarding which depth intervals) inthe <br /> Intermediate Aquifer are impacted with COCt and the overalivertical thickness mthe groundwater <br /> plume. <br /> IACATION HP123 / M-SBC <br /> Proposed sampling location HP123 is in the southwestern parboil mthe Ripon Christian school (RCS). <br /> This stamping location i located approximately dow rgmdiem ofwell RC-1, and upgradient of several <br /> Private water supply wells on North Wilma Avenue. Well RC has had detections of ICE and <br /> - 2.2pg/L, resinedively, in September 2019 (according to the State's <br /> Mdatabase).�A Depthdiscrete sampling will Provide information to evaluate if the groundwater <br /> plume has extended downgradient aRel, and If so, what depth in ensal(s( are impacted. furthermore, <br /> well lM-sfln will Red in the Intermediate Zone so that groundwater immediately <br /> gadlent of the private supply we monitored overtime. note that we are <br /> currently awaiting access to RCS to complete the uworkif axes cannot be obtained, we will attempt to <br /> obtain access ham the adjacent commercial property to the west <br /> LOCATION HP124 <br /> Proposed sampling location HP126 is on the Ripon Public School (BPS) nearvirall RIPS-I, which provides <br /> MEDgroundwater plume lepresent ' un" of RPB-1 <br /> E and cis 12f (Twere detectedt 12 and 26 BOT, respectively, amplecnnectedIn September 19). x al thicknesst in this area h somewhat <br /> uncertain. Collecting tlepavdisc groundwater samples atthh Ioa will provide information <br /> regarding which depth immoralist in the Intermediate Aquifer are imparted with COCs. <br /> MICH <br />